: I Output `7

: I Output `7
US008422700B2
(12) United States Patent
(10) Patent N0.:
Chen
(54)
US 8,422,700 B2
(45) Date of Patent:
AUDIO SIGNAL ADJUSTING SYSTEM AND
(58)
Apr. 16, 2013
Field of Classi?cation Search .................. .. 381/56,
METHOD
381/57, 1004110
See application ?le for complete search history.
( 75 )
lnventor :
Ch'la-M'mg Ch en’ Wugu ( TW)
(56)
References Cited
(73) Ass1gnee: Iflazilggstcagulgtgslzllaéforporatlon, Wugu,
-
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( * )
-
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Us‘ PATENT DOCUMENTS
-
$11518 11S5Z>€$ILdeg9°5rdadJuSted under 35
.
.
.
a
y
5,666,426 A *
9/1997
Helms ........................... .. 381/57
6,868,162
3/2005
Jubien et a1.
B1*
2008/0085007 A1 *>l<
......... ..
381/107
4/2008 verdecanna
Engelbrecht et
et a1‘
a1. ‘ .........
‘ ‘ ‘ ‘ ‘ ‘ ‘ “ .. 381/57
s.
y
* cited by examiner
(21)
Appl' NO': 12/916’403
Primary Examiner * Nhan T Tran
(22)
Filed,
Assistant Examiner * Xi Wang
Oct 29, 2010
'
(74) Attorney, Agent, or Firm * Cheng-Ju Chiang
(65)
Prior Publication Data
Us 2011/0299705 A1
_
(30)
Dec- 8: 2011
An audio signal adjusting method is disclosed, Which com
prises steps of: determining an environment noise level; cal
_
_
culating a ratio between an environment noise level and an
output audio signal level to form a measuring value; compar
(TW) ............................. .. 99118452 A
ing the measuring Value With a predetermined threshold as an
Int Cl
audio comfort value; and determining Whether ornot to adjust
H0'3G /00
H03G 3/20
H04R 29/00
(2006 01)
(200601)
(200601)
an audio signal parameter according to the comparison result.
If the comparison result is incorrect, then the audio signal
parameter is adjusted, and the output audio signal should be
'
U 5 C1
( ) U'SI;C '
outputted according to the adjusted audio signal parameter.
The audio signal adjusting method can satisfy the different
user needs on different environment types.
14 Claims, 5 Drawing Sheets
52
381/107_ 38166 381/57_ 381/104_
381/108; 381/109
32
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l
30
./
Audio signal
3
ABSTRACT
_
Forelgn Apphcatlon Pnonty Data
Jun. 7, 2010
(51)
_
(57)
detector
.
12
Audio ampli?er
//
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Input audio
13
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signal
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comparing
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First data
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Storing region
Memory 0 Microprocessor
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Second data
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storing region
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Image
Sealer 10 Counter controller
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Output
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audio Signal
Loudspeaker
5
US. Patent
Apr. 16, 2013
Sheet 2 of5
US 8,422,700 B2
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US. Patent
Apr. 16, 2013
Sheet 4 of5
US 8,422,700 B2
S100
determining an
/
environmental noise level
S102
calculating a ratio between the environmental
noise level and an output audio signal level to
obtain a measuring value
S104
comparing the measuring value
/
With a predetermined threshold
S106
the measuring value exceeds
a range of the predetermined
S108
adjusting an audio signal
adjusting parameter
S112
/
output audio signal
FIG. 3
S109
using the original
audio signal
adjusting
parameter
US. Patent
Apr. 16, 2013
Sheet 5 of5
US 8,422,700 B2
@ / s90
CountVolumeUp = 0 4
CountVolumeDn = O
+
/Sl()()
measuring
environmental noise
i
calculating /S102
MAENR
C0untV01umeDn=
C0untV01umeDn+1
S203
C0untV0lumeUp=
C0untV0lumeDn>=l 5
COuntV01um6UD+ 1
S1 1
adjusting the / 2
volume
FIG. 4
US 8,422,700 B2
1
2
utiliZing an audio signal detector for detecting an external
AUDIO SIGNAL ADJUSTING SYSTEM AND
METHOD
acoustic signal outside the electronic device and transmitting
the detected external acoustic signal to an audio processor;
utiliZing the audio processor for generating an output audio
TECHNICAL FIELD OF THE INVENTION
signal according to an audio signal adjusting parameter and
the at least one input audio signal, Wherein the output audio
signal has an output audio signal level, and the audio proces
sor transmits the output audio signal level and the external
acoustic signal to a microprocessor;
utiliZing the microprocessor to control an evaluating and
comparing logic unit to determine an environmental noise
The present invention relates to an audio signal adjusting
system and method, and more particularly, to an audio signal
adjusting system and method capable of actively adjusting an
audio output intensity.
BACKGROUND OF THE INVENTION
level according to the external acoustic signal, and thereby the
microprocessor transmitting the environmental noise level
back to the audio processor;
Nowadays, common media playing devices such as televi
sions (TVs) and ?at displays have become essential entertain
ment devices for the modern humans. Those media playing
devices combining both functions of TVs and ?at displays
utiliZing the audio processor for calculating a ratio betWeen
the environmental noise level and the output audio signal
level to correspondingly form a measuring value;
can not only provide a television channels for Watching but
also can be served as computer monitors. Within the tendency
value With a predetermined threshold; and
utiliZing the microprocessor for determining Whether or
of developing various kinds of display components and image
processing technologies, some of the media playing devices
are capable of approaching the real image and sound Without
distortion. HoWever, Whether the audio volume intensity is at
utiliZing the microprocessor for comparing the measuring
20
to the comparison result of the measuring value and the pre
determined threshold, Wherein if the comparison result is
incorrect, the microprocessor adjusts the audio signal adjust
ing parameter and then transmits the adjusted audio signal
an appropriate level is signi?cantly factored in a user’ s audio
visual feelings.
25
An external environment noise may affect that a user is
forced to frequently adjust an audio volume of a media play
ing device. For instance, When the environment noise is made
at a high level, the user has to manually increase the audio
volume to hear clearer, Whereas the user has to manually
decrease the audio volume again as long as the environment
noise is turned doWn. The intensity of audio volume output
must be varied With satisfying the demand of the user’s audio
30
device for receiving an input audio signal. Said audio signal
an audio signal detector for detecting an external acoustic
signal outside the electronic device;
an audio processor for generating an output audio signal
35
according to an audio signal adjusting parameter and the
input audio signal, Wherein the output audio signal has an
output audio signal level;
systems introduced for automatically adjusting the audio vol
those conventional systems can not adjust the audio volume
according to either the user’s habit or different noise environ
ment types, and thereby can not obtain an ef?cient audio
volume adjustment and can not satisfy the needs on the user’ s
audio comfort. Or else, those systems are too complicated to
be convenient for the operation and to loWer the manufactur
and the at least one input audio signal.
In another aspect, the present invention provides an audio
signal adjusting system, Which is applicable to an electronic
adjusting system comprises:
volume over and over again. This Would invoke inconvenient
to Watch television. For noW, there are various multimedia
ume based on the environmental noise variances. HoWever,
adjusting parameter to the audio processor, and the audio
processor generates a corresponding output audio signal
according to the adjusted audio signal adjusting parameter
comfort. Under a manner that the environmental noise is
varied frequently, the user has to manually adjust the audio
not to adjust the audio signal adjusting parameter according
40
an evaluating and comparing logic unit for determining an
environmental noise level according to the external acoustic
signal, Wherein the audio processor calculates a ratio betWeen
the environmental noise level and the output audio signal
level and thereby correspondingly forming a measuring
value;
45
a memory for storing a predetermined threshold; and
a microprocessor connected to the memory and the audio
processor for respectively receiving the measuring value
from the audio processor and the predetermined threshold
from the memory, and comparing the measuring value With
ing cost.
SUMMARY OF THE INVENTION
50
To solve the draWbacks of the aforementioned prior art, a
the predetermined threshold.
In the present invention, the audio signal adjusting param
eter (e.g., a volume setting value) is automatically and
dynamically adjusted according to the ratio betWeen the envi
primary objective of the present invention is to provide an
audio signal adjusting system and method applicable for a
ronmental noise level and the output audio signal level for the
media playing device, Which is capable of automatically and
dynamically adjusting an audio output intensity of the media
playing device.
adequate. Therefore, the present invention is capable of solv
ing the draWbacks of frequently adjusting the volume by hand
situation that the user feels comfortable, endurable, or
55
Another objective of the present invention is to provide an
in a noisy place. Moreover, the comfort ratio betWeen the
environmental noise level and the output audio signal level is
audio signal adjusting system and method applicable for a
media playing device, Which is capable of adjusting the audio
decided by the user or selected from the predetermined values
volume according to either a user’ s habit or the environmental
60
noise, and thereby satisfying the different user demands on
different noise environment types.
To accomplish the above invention objectives, the present
invention provides an audio signal adjusting method, Which is
applicable to an electronic device for receiving at least one
input audio signal. Said audio signal adjusting method com
prises the folloWing steps of:
stored in the system. Therefore, the present invention is
capable of adjusting the volume according to a user’s habit
and thereby satisfying the different user demands on different
noise environment types.
BRIEF DESCRIPTION OF THE DRAWINGS
65
The present invention Will be described in details in con
junction With the appending draWings.
US 8,422,700 B2
4
3
signal, the ampli?ed electronic signal is further converted by
FIG. 1A is a structural diagram showing an audio signal
adjusting system implemented according to a ?rst embodi
ment of the present invention.
FIG. 1B is a structural diagram showing that an evaluating
and comparing logic unit is implemented as a hardWare in
the loudspeaker 25 into a physical acoustic Wave Which is
audible for the user. The aforesaid input audio signal can be an
analog signal or a digital signal, and can be inputted from
5
another implementation of the ?rst embodiment.
FIG. 2 is a structural diagram shoWing an audio signal
adjusting system implemented according to a second embodi
ment of the present invention.
FIG. 3 is a How chart shoWing an audio signal adjusting
method implemented according to the present invention.
FIG. 4 is a How chart shoWing Step S106 of FIG. 3 in detail
for determining Whether a measuring value exceeds a prede
termined threshold.
oriented from a cable television or a Wireless television. The
aforesaid output audio signal also can be outputted for other
devices via different interfaces, besides the loudspeaker 25.
At the time the scaler 10 processes the input audio signal,
the audio processor 12 receives the input audio signal and
then modulates the input audio signal according to an audio
signal adjusting parameter, and thereby correspondingly gen
erates the output audio signal. The audio signal adjusting
parameter can be a volume setting value of television. The
audio signal adjusting parameter may be pre-stored in the ?rst
DETAILED DESCRIPTION OF THE INVENTION
data storing region 51 such as a ?ash memory or in the second
data storing region 52 such as a DDR memory (double data
rate synchronous dynamic random access memory). The
Please refer to FIG. 1A, Which is a structural diagram
shoWing an audio signal adjusting system 1 implemented
according to a ?rst embodiment of the present invention. The
20
audio signal adjusting system 1 is applied to a media playing
device. In the ?rst embodiment, the media playing device
may be a type of video systems such as televisions (TVs), and
displays, etc. These video systems all have a scaler 10 for
adjusting image siZe, resolution, and processing audio sig
25
nals. FIG. 1A only shoWs those components relating to audio
30
As shoWn in FIG. 1A, the audio signal adjusting system 1
35
an analog-to-digital converter (ADC) 191, a ?rst data storing
input therefrom. The counter 18 is utiliZed for counting and
40
thereby transmitting the counting results to the microproces
sor 14. In addition, the ADC 191 is utiliZed for sampling an
audio signal and then converting the sampled audio signal
from analog to digital.
In the present invention, the amplitude of the output audio
45
data storing region 51, and the second data storing region 52,
signal is adjusted according to an environmental noise so as to
change the sound volume outputted from the loudspeaker 25.
For instance, the output volume is increased automatically
When the environmental noise is made at a high level and the
output volume is decreased automatically When the environ
playing device. The image controller 16 (e.g., on screen dis
50
mental noise is made at a loW level. Therefore, a user does not
need to manually adjust the output volume, repeatedly or
frequently.
14. In other embodiments, a part of or all the components in
As shoWn in FIG. 1A, the audio signal detector 32, e.g., a
the audio signal adjusting system 1 can be arranged in other
electronic portions of the media playing device instead of the
55
microphone, is utiliZed for detecting the external acoustic
signal outside the media playing device. The audio signal
detected by the audio signal detector 32 is transmitted to the
?lter 34 so as to be ?ltered out those audio frequencies inac
external acoustic signal outside the media playing device. The
cessible to the human ear, and then the ?ltered signal is
transmitted to the ADC 191 to be sampled.
external acoustic signal consists of an environmental noise
60
If the input audio signal is an analog signal, it is required to
be sampled by the ADC 191. The input audio signal can be
represented as:
audio processor 12 of the scaler 10.
At the time the media playing device receives an input
audio signal, the scaler 10 functions on processing the input
audio signal and correspondingly outputting an output audio
tion, the microprocessor 14 is coupled to the image controller
controlling information display on a screen and a command
are connected to or included Within the scaler 10 of the media
and the sound released from the loudspeaker 25 (e.g., the
sound from a television). Then, the detected external acoustic
signal is ?ltered by the ?lter 34 and then transmitted to the
processor 14 receives the output audio signal level and the
external acoustic signal from the audio processor 12. In addi
16 and the counter 18. The image controller 16 is utiliZed for
region 51, a second data storing region 52, an audio ampli?er
scaler 10.
The audio signal detector 32 is utiliZed for detecting an
The audio processor 12 can generate an output audio signal
cessor 14 is connected to the audio processor 12. The micro
evaluating and comparing logic unit 13, a microprocessor 14,
play (OSD) controller) is a component existed in the media
playing device, and can be connected to the microprocessor
transmitted to the audio ampli?er 20 and the loudspeaker 25.
level corresponding to the output audio signal. The micropro
of the ?rst embodiment comprises an audio processor 12, an
ponents in the audio signal adjusting system 1, such as the
audio processor 12, the evaluating and comparing logic unit
13, the microprocessor 14, the memory controller 15, the
image controller 16, the counter 18, the ADC 191, the ?rst
eter to the audio processor 12 and then the audio processor 12
the output audio signal. Then, the output audio signal is
devices.
20, a loudspeaker 25, an audio signal detector 32, and a ?lter
34. The audio ampli?er 20 and the loudspeaker 25 can be
components existed in or excluded from the media playing
device.
In the ?rst embodiment shoWn in FIG. 1A, a part of com
determines to read out the audio signal adjusting parameter
pre-stored in the ?rst data storing region or the second data
storing region through the memory controller 15. The micro
processor 14 also transmits the audio signal adjusting param
adjusting parameter and thereby correspondingly generates
system 1 of the present invention is not limited to be applied
a memory controller 15, an image controller 16, a counter 18,
audio signal adjusting parameter is adjusted by calculation
and determination (described later). The microprocessor 14
modulates the input audio signal according to the audio signal
signal processing. It is noted that the audio signal adjusting
to multimedia systems (e.g., televisions and displays). The
system 1 is also applicable to any kind of media playing
various kinds of different interfaces, or an audio source signal
Ain:0t><A sample,
(equation 1)
signal (detailed later). After the output audio signal is ampli
Wherein Ain is the input audio signal, 0t is a sampling varia
tion coe?icient of the ADC 191, and Asample is a sampled
?ed by the audio ampli?er 20 into an ampli?ed electronic
audio signal.
65
US 8,422,700 B2
6
5
The external acoustic signal detected by the audio signal
mits the measuring value to the microprocessor 14. The
microprocessor 14 compares the measuring value With a pre
determined threshold for determining Whether or not to adjust
detector 32 may include an environmental noise and the
sound outputted from the loudspeaker 25, as represented as:
the audio signal adjusting parameter. If the comparing result
is incorrect, the microprocessor 14 adjusts the audio signal
adjusting parameter and transmits the adjusted audio signal
(equation 2)
Wherein Min is the external acoustic signal detected by the
audio signal detector 32, [3 corresponds to the characteristic
curves of the audio ampli?er 20 and the loudspeaker 25, y is
a detecting variation coe?icient of the audio signal detector
adjusting parameter to the audio processor 12. Then, the
audio processor 12 generates a corresponding output audio
signal according to the adjusted audio signal adjusting param
eter and the input audio signal. The predetermined threshold
32, 0t is the sampling variation coef?cient of the ADC 191 as
mentioned above, f corresponds to a transfer function of the
may have an upper limit and a loWer limit, and the micropro
ces sor 14 may compare the measuring value respectively With
the upper limit and the loWer limit.
In an example that the comparing result is incorrect When
?lter 34, G is the audio signal adjusting parameter, and
environment is an environmental noise level.
Assuming that the passband of the ?lter 34 is at all frequen
the microprocessor 14 determines that the measuring value
cies and thus the transfer function is identical to l, the envi
ronmental noise level (Nem-wnmem) can be obtained from the
equation 1 and the equation 2, as represented as:
has exceeded a range of the predetermined threshold that is
constructed by the upper limit and the loWer limit, the micro
processor 14 adjusts the audio signal adjusting parameter and
then the audio processor 12 generates a corresponding output
Min — ? ><y X G X Ain
Nenvironment :
(equation 3)
20
The calculation of equation 3 is carried out by the evaluat
ing and comparing logic unit 13 under control of the micro
processor 14. The evaluating and comparing logic unit 13 can
25
be implemented as a program pre-stored in the ?rst data
storing region 51 as shoWn in FIG. 1A, or a hardWare as
shoWn in FIG. 1B. In FIG. 1B, the evaluating and comparing
logic unit 13' is a hardWare arranged in the scaler 10' of the
audio signal adjusting system 1'. As shoWn in FIGS. 1A and
30
1B, the evaluating and comparing logic unit 13, 13' can access
those default parameters pre-stored in the ?rst data storing
limit of the predetermined threshold or is smaller than the
loWer limit of the predetermined threshold for a predeter
mined number of times, the microprocessor 14 adjusts the
audio signal adjusting parameter and then the audio processor
12 generates a corresponding output audio signal according
to the adjusted audio signal adjusting parameter and the input
audio signal. Or else, the comparing result is correct When the
microprocessor 14 determines that the measuring value does
not exceed the range of the predetermined threshold con
region 51, e.g., the audio signal adjusting parameter (G), the
detecting variation coef?cient of the audio signal detector 32
(y) the sampling variation coef?cient of the ADC 191 (ct), the
audio signal according to the adjusted audio signal adjusting
parameter and the input audio signal. In another case, the
comparing result is incorrect When the microprocessor 14
determines that the measuring value is greater than the upper
axy
35
structed by the upper limit and the loWer limit, the micropro
cessor 14 determines not to adjust the audio signal adjusting
parameter, Whereby the audio processor 12 generates the
output audio signal according to the original audio signal
adjusting parameter and the input audio signal.
characteristic curves of the audio ampli?er 20 and the loud
speaker 25 (B), for calculating the environmental noise level
Please refer to FIG. 2, Which is a structural diagram shoW
(Nem-wnmem). It is noted that the environmental noise level
Nenvironmem) is not limited to be obtained through the above
mentioned equation 3. In the present invention, any other
ing an audio signal adjusting system 1" implemented accord
40
manner to obtain the environmental noise level (Nenvironment)
analog input audio signal and/or a digital input audio signal
can be implemented as Well.
Ammple can be a root-mean-square value of voltage or
poWer obtained from continuously sampling the input audio
45
signal may come from interfaces or standards such as ATV,
or poWer.
50
input audio signal has to be decoded by an audio decoder 193
sor 14. Then, the evaluating and comparing logic unit 13, 13'
in advance. Then, the decoded input audio signal is transmit
55
(Nenviwnmem) according to the external acoustic signal (Min),
the input audio signal (Ain), and those parameters pre-stored
in the data storing region 51 or 52, e.g., the audio signal
adjusting parameter (G), the detecting variation coe?icient of
the audio signal detector 32 (y) the sampling variation coef
DTV, AV, YPbPr, HDMI, PC-line-in for a television. The
analog input audio signal is converted to a digital signal by an
analog-to-digital converter (ADC) 192 and then the digital
signal is transmitted to the audio processor 12. Since the
digital input audio signal is compressed inherently, the digital
(Min) and the input audio signal (Ain) from the microproces
performs a calculation to obtain the environmental noise level
and the audio processor 12 can output an analog output audio
signal and/ or a digital output audio signal in the second
embodiment of the present invention. The analog input audio
signal (Ain) for a time period, e.g., one second. The output
audio signal level and the environmental noise level
(Nem-wnmem) also can be a root-mean-square value of voltage
The evaluating and comparing logic unit 13, 13' is con
trolled by the microprocessor 14. The evaluating and com
paring logic unit 13, 13' receives the external acoustic signal
ing to a second embodiment of the present invention. The
difference betWeen the ?rst embodiment and the second
embodiment is that the scaler 10" can be inputted With an
60
ted to the audio processor 12. In the second embodiment, the
audio processor 12 can output an analog output audio signal
and/or a digital output audio signal. The analog output audio
signal and the digital output audio signal are ampli?ed
respectively through an analog audio ampli?er and a digital
audio ampli?er, and then transmitted to the loudspeaker 25.
?cient of the ADC 191 (ct), the characteristic curves of the
Since the other components in this embodiment are similar to
audio ampli?er 20 and the loudspeaker 25 ([3). The obtained
those of the ?rst embodiment, the detailed descriptions
regarding these components are omitted herein.
environmental noise level (Nenviwnmem) is transmitted to the
audio processor 12 via the microprocessor 14. The audio
processor 12 calculates a ratio betWeen the environmental
noise level (Nenvironment) and the output audio signal level for
correspondingly forming a measuring value and then trans
Please refer to FIGS. 1A and 3. FIG. 3 is a How chart
65
shoWing an audio signal adjusting method implemented
according to the present invention, Which is applicable for a
media playing device. In the application of the present inven
US 8,422,700 B2
7
8
tion, the media playing device is capable of receiving an input
Then, the audio comfort value selected by the user is trans
mitted to the microprocessor 14.
In Step S106, the microprocessor 14 determines Whether or
audio signal and automatically determining Whether or not to
adjust the audio output according to an environmental noise.
In the beginning, an audio signal detector 32 is utiliZed for
detecting an external acoustic signal outside the electronic
device and transmitting the detected external acoustic signal
not to adjust the audio signal adjusting parameter (e.g.,
Whether or not to adjust the output volume) according to
Whether the comparing result betWeen the MAENR and the
TAENR is correct or not. The audio processor 12 modulates
to an audio processor 12.
the input audio signal and correspondingly generates the out
put audio signal according to the audio signal adjusting
parameter from the microprocessor 14.
The comparing result is incorrect When the microprocessor
The audio processor 12 is utiliZed for correspondingly
generating an output audio signal according to an audio signal
adjusting parameter and the input audio signal. The output
audio signal has an output audio signal level. The audio
processor 12 transmits the output audio signal level and the
external acoustic signal to a microprocessor 14.
In Step S100, the microprocessor 14 controls an evaluating
and comparing logic unit 13 to determine an environmental
noise level. For instance, the microprocessor 14 controls the
14 determines that the MAENR is greater than the TAENR or
the MAENR exceeds a range de?ned according to the
TAENR, the microprocessor 14 adjusts the audio signal
adjusting parameter (Step S108) and then transmits the
adjusted audio signal adjusting parameter to the audio pro
cessor 12. That is, the amplitude of the output audio signal
Will be adjusted. Then, the audio processor 12 generates a
evaluating and comparing logic unit 13 to perform the calcu
lation of afore-mentioned equation 3 to obtain the environ
mental noise level. The environmental noise level can be an
instant value or an average value With respect to a sampling
20
comparing result is correct When the microprocessor 14 deter
period. In one embodiment, the evaluating and comparing
mines that the MAENR is smaller than or equal to the
TAENR, or the MAENR does not exceed the range de?ned
logic unit 13 can be implemented as a program pre-stored in
a ?rst data storing region 51. This program is capable of
performing the calculation of aforesaid equation 3. The
corresponding output audio signal according to the adjusted
audio signal adjusting parameter (Step S112). Conversely, the
25
microprocessor 14 can access the program pre-stored in the
?rst data storing region 51 through a memory controller 15
and control the evaluating and comparing logic unit 13 to
according to the TAENR, the original audio signal adjusting
parameter is maintained or unchanged (Step S109). That is,
the audio signal adjusting parameter Will not be adjusted.
Then, the audio processor 12 generates the output audio sig
nal according to the original audio signal adjusting parameter
(Step S112).
execute the program. The calculation results can be tempo
rarily stored in a second data storing region 52. In another
embodiment, the evaluating and comparing logic unit 13 can
be implemented as a hardware Which is capable of performing
the calculation of aforesaid equation 3.
In Step S102, the audio processor 12 receives the environ
30
mental noise level from the evaluating and comparing logic
35
When adjusting the audio signal adjusting parameter, the
microprocessor 14 can increase or decrease the audio signal
adjusting parameter by a small unit in one time. For instance,
the microprocessor 14 can increase or decrease the volume
little by little. The microprocessor 14 also can adjust the
volume in one time to make the MAENR approaching the
unit 13 via the microprocessor 14. The audio processor 12
TAENR. In another manner, the audio signal adjusting
calculates a ratio betWeen the environmental noise level and
parameter can be adjusted according to a conversion table or
a conversion curve stored in the system. If the volume is
the output audio signal level for correspondingly forming a
measuring value. The measuring value is de?ned as a mea
suring audio environment noise ratio (MAENR). This mea
suring value can be stored in the second data storing region
40
52.
In Step S104, the microprocessor 14 and the audio proces
sor 12 are connected and the microprocessor 14 receives the
measuring value from the audio processor 12. The micropro
45
situation that the user feels comfortable, or endurable. There
fore, the present invention is capable of solving the draW
backs of frequently adjusting the volume by hand in a noisy
place. Moreover, the comfort ratio betWeen the environmen
tal noise level and the output audio signal level is decided by
cessor 14 compares the measuring value With a predeter
mined threshold. The predetermined threshold is an audio
comfort value With Which a user feels comfortable. The audio
comfort value is de?ned as a threshold audio environment
noise ratio (TAENR). TAENR is a ratio betWeen the environ
already at a high level, the increasing amplitude or the
decreasing amplitude can be cut doWn.
In the present invention, the audio signal adjusting param
eter (e.g., a volume setting value) is automatically and
dynamically adjusted according to the ratio betWeen the envi
ronmental noise level and the output audio signal level for the
50
the user or selected from the predetermined values stored in
mental noise level and the output audio signal level for the
the system. Therefore, the present invention is capable of
situation With Which the user feels comfortable, or endurable.
adjusting the volume according to a user’s habit and thereby
For instance, in a particular environment, the user adjusts an
original volume to a comfortable volume by hand. After the
comfortable volume is set up, the microprocessor 14 calcu
lates the TAENR according to the comfortable volume set by
the user and the environmental noise level at the time. As
described above, this predetermined threshold can be set or
decided by the user. In another case, the predetermined
threshold is pre-stored in the system. The system can be
designed to include several different modes corresponding to
satisfying the different user demands on different noise envi
ronment types.
Please refer to FIGS. 1A, 3, and 4. FIG. 4 is a How chart
55
shoWing the Step S106 of FIG. 3 in detail. The Step S106 is
used to determine Whether the comparing resulted is incor
rect, e.g., Whether the measuring value exceeds the range of
the predetermined threshold.
60
different predetermined thresholds. The predetermined
CountVolumeDoWn. These tWo parameters are utiliZed for
counting a time When the condition is satis?ed and accumu
thresholds of different values canbe pre-stored in the ?rst data
storing region 51. The user can select one of the audio comfort
values (i.e., the predetermined thresholds) pre-stored in the
?rst data storing region 51, by manipulating or transmitting a
command to an image controller 16 via an input interface.
In the beginning, the microprocessor 14 sets a Zero value to
the tWo parameters in a counter 18, i.e., CountVolumeUp and
65
lating the counts. After the external acoustic signal is
detected, the environmental noise level is determined for
calculating the MAENR. The microprocessor 14 further com
pares the MAENR respectively With TAENRXI.1 (i.e., the
US 8,422,700 B2
9
10
thereby the microprocessor transmitting the environ
upper limit) and TAENR><0.9 (i.e., the lower limit) (as per
formed by Steps S201, S211). When the MAENR is found
mental noise level back to the audio processor;
utiliZing the audio processor for calculating a ratio betWeen
the environmental noise level and the output audio sig
nal level to correspondingly form a measuring value;
smaller than the lower limit of the TAENR, the counter 18
counts a time and the value of CountVolumeDoWn is
increased by one (as Step S202). When the MAENR is found
greater than the upper limit of the TAENR, the counter 18
counts a time and the value of CountVolumeUp is increased
utiliZing the microprocessor for comparing the measuring
value With a predetermined threshold; and
utiliZing the microprocessor for determining Whether or
not to adjust the audio signal adjusting parameter
according to the comparison result of the measuring
value and the predetermined threshold, Wherein if the
by one (as Step S212). When the value of either CountVol
umeDoWn or CountVolumeUp reaches to a predetermined
number of times (e.g., 15 times) (Step S203 or Step S213), the
microprocessor 14 determines to adjust the audio signal
adjusting parameter for correspondingly altering the audio
output. For instance, the microprocessor adjusts a volume
setting value for increasing or decreasing the volume. In the
present invention, the MAENR is respectively compared With
TAENR><1 .l (i.e., the upper limit) and TAENR><0.9 (i.e., the
loWer limit). Therefore, it can avoid adjusting the audio signal
adjusting parameter over and over again, and thereby the
poWer consumption is reduced. Moreover, the audio signal
adjusting parameter is adjusted only When the value of Coun
comparison result is incorrect, the microprocessor
adjusts the audio signal adjusting parameter and then
transmits the adjusted audio signal adjusting parameter
to the audio processor, and the audio processor generates
a corresponding output audio signal according to the
adjusted audio signal adjusting parameter and the at
Therefore, the adjusting process triggered by occasional or
least one input audio signal.
2. The audio signal adjusting method of claim 1, Wherein
the predetermined threshold is a predetermined ratio betWeen
the environmental noise level and the output audio signal
temporal noise interferences also can be avoided.
level, Which can be selected via an input interface.
20
tVolumeDoWn or CountVolumeUp reaches to 15 times.
For instance, the microprocessor 14 increases the volume
setting value to increase the audio output only When the
25
3. The audio signal adjusting method of claim 1, Wherein
the comparison result is incorrect When the measuring value
environmental noise increases and MAENR>TAENR><1.1
and When the value of CountVolumeUp reaches to 15 times.
exceeds a range of the predetermined threshold constructed
by an upper limit and a loWer limit, so that the microprocessor
Therefore, the user can hear the sound released from a loud
adjusts the audio signal adjusting parameter.
speaker 25 even though the environmental noise increases.
Conversely, the microprocessor 14 decreases the volume set
ting value to decrease the audio output only When the envi
ronmental noise decreases and MAENR<TAENR><09 and
When the value of CountVolumeDoWn reaches to 15 times.
30
or is smaller than the loWer limit of the predetermined thresh
old for a predetermined number of times, so that the micro
Therefore, the user still can hear the sound released from the
loudspeaker 25 under the appropriate volume.
While the preferred embodiments of the present invention
35
have been illustrated and described in detail, various modi?
cations and alterations can be made by persons skilled in this
art. The embodiment of the present invention is therefore
described in an illustrative but not restrictive sense. It is 40
intended that the present invention should not be limited to the
particular forms as illustrated, and that all modi?cations and
45
signal detector, and characteristic curves of an audio ampli?er
and a loudspeaker coupled to receive the output audio signal,
in Which the evaluating and comparing logic unit accesses the
detecting variation coef?cient of the audio signal detector and
the characteristic curves of the audio ampli?er and the loud
said audio signal adjusting method comprising steps of:
50
processor;
speaker that are pre-stored in the data storing region.
7. The audio signal adjusting method of claim 6, Wherein in
the step of utiliZing the microprocessor to control the evalu
ating and comparing logic unit to determine the environmen
tal noise level, the environmental noise level is determined
utiliZing the audio processor for generating an output audio
signal according to an audio signal adjusting parameter
5. The audio signal adjusting method of claim 1, Wherein
the audio signal adjusting parameter comprises a volume
setting value, and the output audio signal level is a root-mean
square (RMS) value of the output audio signal.
6. The audio signal adjusting method of claim 1, Wherein in
the step of utiliZing the microprocessor to control the evalu
ating and comparing logic unit to determine the environmen
further based on a detecting variation coe?icient of the audio
1. An audio signal adjusting method applied for an elec
tronic device receiving at least one input audio signal, and
utiliZing an audio signal detector for detecting an external
acoustic signal outside the electronic device and trans
mitting the detected external acoustic signal to an audio
processor adjusts the audio signal adjusting parameter.
tal noise level, the environmental noise level is determined
alterations Which maintain the spirit and realm of the present
invention are Within the scope as de?ned in the appended
claims.
What is claimed is:
4. The audio signal adjusting method of claim 3, Wherein
the comparison result is incorrect When the measuring value
is greater than the upper limit of the predetermined threshold
55
according to folloWing equation:
and the at least one input audio signal, Wherein the
output audio signal has an output audio signal level, and
the audio processor transmits the output audio signal
level and the external acoustic signal to a microproces
sor;
utiliZing the microprocessor to control an evaluating and
comparing logic unit to determine an environmental
noise level according to the external acoustic signal, the
at least one input audio signal, and the audio signal
adjusting parameter, in Which the evaluating and com
paring logic unit accesses the audio signal adjusting
parameter that is pre-stored in a data storing region, and
Min-?Xj/XGXAin
Nenvironment = i,
axy
60
Where Nenviwnmem is the environmental noise level, Min is
the external acoustic signal detected by the audio signal
detector, Ain is the input audio signal, G is the audio
signal adjusting parameter, 0t is a sampling variation
65
coe?icient of an analog-to-digital converter coupled to
receive the input audio signal, [3 corresponds to the char
acteristic curves of the audio ampli?er and the loud
US 8,422,700 B2
11
12
speaker coupled to receive the output audio signal, and y
is the detecting variation coef?cient of the audio signal
11. The audio signal adjusting system of claim 10, Wherein
When the measuring value is greater than the upper limit of the
predetermined threshold or is smaller than the loWer limit of
the predetermined threshold for a predetermined number of
detector.
8. An audio signal adjusting system applied to an electronic
device, the electronic device receiving an input audio signal,
times, the audio signal adjusting parameter is adjusted.
12. The audio signal adjusting system of claim 8, Wherein
the audio signal adjusting parameter comprises a volume
setting value, and the output audio signal level is a root-mean
square (RMS) value of the output audio signal.
13. The audio signal adjusting system of claim 8, Wherein
said audio signal adjusting system comprising:
an audio signal detector for detecting an external acoustic
signal outside the electronic device;
an audio signal processor for generating an output audio
signal according to an audio signal adjusting parameter
and the input audio signal, Wherein the output audio
signal has an output audio signal level;
an evaluating and comparing logic unit for determining an
the environmental noise level is determined further based on
a detecting variation coe?icient of the audio signal detector,
and characteristic curves of an audio ampli?er and a loud
speaker coupled to receive the output audio signal, in Which
the evaluating and comparing logic unit accesses the detect
ing variation coe?icient of the audio signal detector and the
environmental noise level according to the external
acoustic signal, the at least one input audio signal, and
characteristic curves of the audio ampli?er and the loud
the audio signal adjusting parameter, in Which the evalu
ating and comparing logic unit accesses the audio signal
adjusting parameter that is pre-stored in a data storing
region, Wherein the audio processor calculates a ratio
betWeen the environmental noise level and the output
speaker that are pre-stored in the data storing region.
14. The audio signal adjusting system of claim 13, Wherein
the environmental noise level is determined according to
20
folloWing equation:
audio signal level and thereby correspondingly forms a
measuring value;
a memory for storing a predetermined threshold; and
a microprocessor connected to the memory and the audio
Min-?Xj/XGXAin
Nenvironment = i,
axy
25
processor, receiving the measuring value from the audio
processor and the predetermined threshold from the
memory, and comparing the measuring value With the
predetermined threshold.
9. The audio signal adjusting system of claim 8, Wherein
30
the predetermined threshold is a predetermined ratio betWeen
acteristic curves of the audio ampli?er and the loud
level, Which can be selected via an input interface.
10. The audio signal adjusting system of claim 8, Wherein
mined threshold constructed by an upper limit and a loWer
limit, the audio signal adjusting parameter is adjusted.
coe?icient of an analog-to-digital converter coupled to
receive the input audio signal, [3 corresponds to the char
the environmental noise level and the output audio signal
When the measuring value exceeds a range of the predeter
Where Nem-wnmem is the environmental noise level, Min is
the external acoustic signal detected by the audio signal
detector, Ain is the input audio signal, G is the audio
signal adjusting parameter, 0t is a sampling variation
35
speaker coupled to receive the output audio signal, and y
is the detecting variation coef?cient of the audio signal
detector.
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