(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2003/0067407 A1
Kuhn et al. (43) Pub. Date: Apr. 10, 2003
(54) POLICE RADAR/LASER DETECTOR WITH
INTEGRAL VEHICLE PARAMETER
(75) Inventors: John Kuhn, West Chester, OH (US);
Thomas W. Humphrey
Wood, Herron & Evans, LLP
2700 Carew Tower
4 41 Vine Street
Cincinnati, OH 45202-2917 (US)
(52) US. Cl. .......................... .. 342/20; 342/104; 342/106;
342/114; 342/115; 342/176;
(73) Asslgnee: Escort Inc‘
(21) APPL N0.
(22) Filed? Oct- 9! 2001
(51) Int. Cl.7 ............................ .. G01S 7/40; GOlS 13/58
_ _ . . . magnetic signals (e.g. radar, laser) characteristic of a police traffic surveillance device and responds thereto With a dis played and/or audible alert. During periods When no alert is necessary, the detector senses and displays, in numeric or bar graph form, vehicle parameters, such as sound pressure level and acceleration. In addition, calculations based on accel eration provide 0-60 mph time and quarter mile time.
Thereby, the detector enhances information available to the driver Without the inconvenience, expense, and clutter of multiple displays.
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Apr. 10, 2003
POLICE RADAR/LASER DETECTOR WITH
FIELD OF THE INVENTION
 The present invention relates generally to police radar/laser detectors, and more particularly, to displays for police radar/laser detectors.
BACKGROUND OF THE INVENTION
 Police traf?c surveillance devices emit an electro magnetic signal in the radio frequency (RF) band or light band (i.e., infrared, visible, and ultraviolet light) that re?ect off of approaching or departing vehicles to determine their speed. In particular, a change in frequency (Doppler shift) or a change in time of travel for return signal pulses is sensed for calculating vehicle speed.
 Police radar and laser detectors (“detectors”) are used by drivers of vehicles to detect radiant electromagnetic signals characteristic of police traf?c surveillance devices.
In particular, the folloWing RF (radar) frequency bands are used: X-band (10.525 GHZIZS MHZ); K-band (24.150
GHZilOO MHZ); and Ka-band (34.700 GHZI1300 MHZ).
Furthermore, laser Wavelength of 904 nm With 33 MHZ bandWidth is also used. These detectors are generally a detachable device clipped to a visor or dash of the vehicle for unimpeded sensing of the signals and for providing a conveniently positioned display and one or more controls to the driver. While police radar/laser detectors successfully provide alerts to the driver, generally during signi?cant portions of time there are no alerts to be made. Conse quently, the display capabilities of the detector are generally limited to displaying the operating mode (“pilot mode”) of the detector. In addition to the under-utiliZed display, detec tors increasingly use digital signal processors for processing received electromagnetic signals that operate faster With additional data and program storage capabilities. Conse quently, the processing capacity of the detectors is also under-utiliZed much of the time. For eXample, detectors spend less than tWo percent of their operating time alerting the user of received electromagnetic signals.
 Taking advantage of the unused capacity of a detector Would increase its value. For instance, many drivers
Would bene?t from the display of other sensed conditions associated With their vehicle. HoWever, sensor displays integral to the vehicle instrument panel are either expensive or unavailable for certain models. Using after-market dis plays is inconvenient and tends to clutter the interior of the vehicle. Consequently, drivers often forego incorporating additional displays for sensed conditions.
 Therefore, a signi?cant need eXists for a police radar/laser detector that incorporates additional sensing and display of conditions associated With a vehicle.
 The present invention addresses these and other problems in the prior art by providing a police radar/laser detector that senses and displays a vehicle parameter, such as a sound pressure level, acceleration, etc. During those periods When the detector is not required to alert the driver of a police traf?c surveillance device, the detector is con
?gured to provide additional valuable information to the driver.
 Consistent With one aspect of the invention, a detector and method of using a detector include a receiver that receives an electromagnetic signal emitted by a police traffic surveillance device. A controller responds to the received electromagnetic signal by initiating a visual and/or audible alert. The controller also responds to a sensed vehicle parameter by displaying the parameter When the alert is not present.
 Consistent With an additional aspect of the inven tion, a detector similarly responds to sensed electromagnetic signal by initiating an alert. Advantageously, the detector includes a sensor for sensing sound pressure or acceleration.
A controller is responsive to the sensor to display sound pressure or acceleration.
 The above and other objects and advantages of the present invention shall be made apparent from the accom panying draWings and the description thereof.
BRIEF DESCRIPTION OF THE DRAWING
 The accompanying draWings, Which are incorpo rated in and constitute a part of this speci?cation, illustrate embodiments of the invention and, together With a general description of the invention given above, and the detailed description of the embodiments given beloW, serve to explain the principles of the invention.
 FIG. 1 is a block diagram of a police radar/laser detector incorporating vehicle parameter sensing of sound pressure and acceleration;
 FIG. 2 is a block diagram of the sound pressure level circuitry referenced in FIG. 1;
 FIG. 2A is a series of voltage plots as a function of time for various nodes depicted in FIG. 2;
 FIG. 3 is a How chart for a sequence of operations performed by the detector FIG. 1 for initiating alerts and for displaying sensed vehicle parameters;
 FIG. 4 is a How chart for the sequence of operation for sound pressure level display referenced in FIG. 3; and
 FIG. 5 is a How chart for the sequence of operation for accelerometer display referenced in FIG. 3.
DETAILED DESCRIPTION OF SPECIFIC
EMBODIMENTS electromagnetic signals (e.g. radar, laser) characteristic of a police traf?c surveillance device and responds thereto With a displayed and/or audible alert. During periods When no alert is necessary, the detector senses and displays, in numeric or bar graph form, vehicle parameters, such as sound pressure level and acceleration. In addition, calcula tions based on acceleration provide 0-60 mph. time and quarter mile time. Thereby, the detector enhances informa tion available to the driver Without the inconvenience, eXpense, and clutter of multiple displays.
 Turning to the draWings, Wherein like parts have like numbers throughout the several vieWs, FIG. 1 depicts a police radar/laser detector 10 for use in a vehicle such as a car or truck. In particular, the detector 10 includes a front end portion 12 for receiving radiant electromagnetic signals
Apr. 10, 2003 by police traf?c surveillance devices. The received signals are demodulated for processing by a back end portion 14.
 Auser selects processing options through controls
16. The back end portion 14 responds by con?rming selected options and results of processing on a display 18. In the illustrative embodiment, an alphanumeric dot matrix display
(LED) is used for displaying alphanumeric and bar graph representations, in a manner described in US. Pat. No.
5,668,554, the disclosure of Which is expressly incorporated herein by reference. The detector 10 also includes a vehicle sensor 20 for sensing a vehicle parameter. Alternatively or in addition to, a vehicle sensor connection 22 may be coupled to remote sensors in or on the vehicle to sense the same or other vehicle parameters.
 In the illustrative embodiment, the detector 10 is con?gured to sense both radar (i.e. radio frequency, or RF, signals) and laser signals. Thus, the front end 12 has a laser receiver 24 that senses illumination by a laser. The general operation of the laser receiver 24 is described in US. Pat.
No. 5,206,500, the disclosure of Which is expressly incor porated herein by reference. The received laser signal is converted to an analog electrical voltage that is converted to a digital value by an analog-to-digital converter (ADC) 26.
The digital value is input to a microcontroller 28 such as the
68HC908GP32 microprocessor manufactured by Motorola.
 The front end portion 12 receives signals With an
RF receiver 30. The microcontroller 28 performs digital signal processing on the input signals received from the front end portion 12, storing values and control settings in nonvolatile memory 32. The general operation of the RF receiver 30 and microcontroller 28 is described in US. Pat.
No. 4,313,216; US. Pat. No. 4,581,769; US. Pat. No.
4,954,828; US. Pat. No. 5,049,885; US. Pat. No. 5,079,553; and US. Pat. No. 5,305,007, the disclosures of Which are expressly incorporated herein by reference.
 The controls 16 include a poWer and volume con trol rotatory dial 34. An “AUTO/HWY/CITY” button 36 toggles a sensitivity setting for the RF receiver 30 betWeen
OUT). Each acceleration signal has an overall period set by a duty cycle adjustment 57. The acceleration causes a positive logic pulse to vary the duty cycle of the acceleration signal. For a given period, a duty cycle sensed in the acceleration signal may be converted to the corresponding acceleration, or G, by use of an acceleration lookup table 58, stored in memory 32. As an alternative to using the duty cycle adjustment 57 to correct the period of the acceleration signal to match the table 58, it Will be appreciated that a correction may be implemented as a softWare calculation by the controller 28. In the illustrative embodiments, the accel erometer 56 comprises a 2-axis acceleration sensor on a single IC chip, e. g., model ADXL202E accelerometer manu factured by Analog Devices of NorWood, Mass. Other accelerometers, including one-axis accelerometers may be used in the alternative.
 The microcontroller 28 incorporates DSP input/out
(I/O) circuitry 60 for receiving the analog signals SPLDC, X
OUT, Y OUT from the vehicle sensor 20. The DSP I/O 60 also controls the SPL circuitry 54 by setting a gain level
(1-4) via gain signals Gain 0, Gain 1. The DSP I/O 60 also controls the peak level refresh rate With a dump signal to the
SPL circuitry 54.
 Referring to FIG. 2, the SPL circuitry 54 is depicted in block diagram form, With intermediate voltage values VA-VE illustrated in FIG. 2A. In order to obtain a
Wide acoustic range in SPL sensing, the SPL circuitry 54 begins With a selectable bias circuit 62. One of four bias levels is selectable (Gain 0, Gain 1=00, 01, 10, 11), so that a biased voltage signal VA is maintained Within the input range of a high gain circuit 64 to produce an ampli?ed the ampli?ed voltage signal VB to level shifted voltage signal Vc as a ?rst step in converting the high frequency AC signal to a loWer frequency signal for digital signal process ing. Apeak detect circuit 68 loW pass ?lters the signal Vc to a peak level voltage signal VD. To compensate for a gain loss, a double gain circuit 72 increases the ampli?cation of the signal VD to an approximately DC voltage signal VE, or toggles the brightness level of the display betWeen a daylight setting, a dim setting, and a dark mode Wherein only audible alert. In addition, a pilot mode button 42 is advantageously added to sequence through various operating modes.
 The microcontroller 28, or controller, advanta geously includes suf?cient processing capability to incorpo rate voice circuitry 44 that generates verbal alerts that are ampli?ed by an audio driver 46 for broadcast by an audio interface 48, in particular a speaker 50. The audio interface
48 provides sound pressure sensing by either a separate microphone 52 or by alternating use of the speaker 50 as a microphone and a speaker. The sensed sound pressure signal from the microphone 52 is received by sound pressure level
(SPL) circuitry 54 of the vehicle sensor 20. The SPL circuitry 54 ampli?es and outputs a peak level DC analog signal (“SPLDC”) to the microcontroller 28. The controller
28 converts the SPLDC to a corresponding SPL in dB by referencing an SPL lookup table 55 stored in memory 32.
 The vehicle sensor 20 also includes a dual axis accelerometer 56 of the vehicle sensor 20, Which produces longitudinal and lateral acceleration signals (X OUT, Y coupled betWeen the VD node and ground. Thereby, addi tional loW pass ?ltering of the peak level voltage signal VD is provided, periodically reset by the DUMP signal.
 Referring to FIG. 3, a sequence of operations, depicted as routine 100, is performed by the detector 10 of
FIG. 1 for detection and vehicle parameter sensing. During poWer-up or activation of the pilot mode button, initialiZa tion is performed Wherein a current pilot mode is read from memory or accepted from the controls (block 102). Routine
100 then enters into a repetitive cycle Wherein sWeeps and processing are performed for each frequency range charac teristic of radiant electromagnetic signals for a police traf?c surveillance device (block 104). In addition to sWeep pro cessing, the detection mode is displayed (block 106).
 If a neW or active alert is detected in block 108, then the alert is audibly announced, if enabled, and dis played (block 110). Control returns to block 104, ignoring vehicle parameter sensing. HoWever, it Will be appreciated that some applications may continue sensing and displaying a vehicle parameter along With the alert.
 If no neW or active alert Was detected in block 108, then a determination is made as to Whether SPL pilot mode
Apr. 10, 2003 is selected (block 112). If so, a sound pressure level routine
114 is performed and processing returns to block 104. If not
SPL mode in block 112, then a determination is made as to
Whether the accelerometer pilot mode is selected (block
116). If so, an accelerometer routine is performed (block
118) and processing returns to block 104. If not accelerom eter pilot mode in block 116, then a determination is made as to Whether a time-to-velocity pilot mode (e.g. 0-to-60 time) has been selected (block 120). If so, the velocity is calculated by integrating the X OUT acceleration signal
(block 122). In particular, the longitudinal acceleration is sampled at very short time intervals and the area under the curve is calculated. The velocity is then calculated using the
 Where V is current velocity, V0 is velocity deter mined from the previous sample, a is acceleration, and t is time. The total sample time is monitored until the target velocity is reached. The start time for integration may be based by detecting a signi?cant acceleration after a button push. Alternatively, a velocity signal may be received via the external sensor connection.
 If not in time-to-velocity pilot mode in block 122, then a determination is made as to Whether time-to-distance
If so, distance is calculated and displayed by tWice integrat ing the longitudinal acceleration signal X OUT (block 126).
In particular, the acceleration is measured and velocity is calculated during each sample interval as previously described. Then, distance X is calculated using the equation
 Where X0 is the distance determined from the previous sample. The total sample time is monitored until the target distance is reached. If not in time-to-distance pilot mode in block 126 or after block 126, processing returns to block 104.
 With reference to FIG. 4, the SPL routine 114 referenced in FIG. 3 includes a sequence of operations performed by the detector of FIG. 1 for sensing and dis playing sound pressure. Since sound pressure levels typi cally produced by an automotive entertainment system have a Wide acoustic range, routine 114 selectably ampli?es the sensed analog signal from the SPL sensor With a predeter
SPL analog signal from the SPL transducer, such as a microphone, converts this analog signal into a digital signal
converted into SPL value (dB) by referencing the SPL lookup table having a digital signal to SPL value conversion list for each selected gain setting (block 142).
 The analog ampli?cation is kept Within an opti mum operating range by changing the gain setting When the digital signal approaches either a minimum value or a maximum value in the SPL lookup table. Thus, a determi nation is made as to Whether the digital signal is at or near a maximum value in a particular conversion list (block 144).
Each gain setting and corresponding conversion list overlaps
With the adjacent gain setting and its corresponding conver sion list to avoid exceeding the operating range of the analog ampli?cation of the sensed analog signal. If a table maxi mum threshold is sensed in block 144, then a further determination is made as to Whether the minimum available gain setting is currently selected (block 146). If not, an opportunity exists to loWer the gain by decrementing the
 If not at the table maximum threshold in block 144, then a further determination is made as to Whether the digital signal is at a table minimum threshold (block 150). If so, then a further determination is made as to Whether the maximum gain setting is currently selected (block 152). If not, an opportunity exists to increase the gain by increment
 After the gain setting has been evaluated and adjusted as necessary in blocks 144-154, the SPL peak hold circuitry to adjust for the next reading (block 156). Also, the
SPL value is displayed in a preselected format. If in a standard number format (“NUM STD (DB)”) (block 158), then the running average of the preceding eight readings are updated on the display in numeric characters (block 160).
then the last tWo readings are averaged and displayed if
if in loW bar graph format of 70-104 dB (“BAR LOW”)
(block 166), then for each second reading, the last four readings are averaged and displayed as a bar graph on the display scaled for 70-104 dB (block 168). Else if in high bar
then for each second reading, the last four readings are averaged and displayed as a bar graph on the display scaled for 70-138 dB (block 172). After one of the respective four formats is displayed, routine 114 returns for continued sWeeps and processing of alerts and SPL readings.
 With reference to FIG. 5, the accelerometer routine
118 of FIG. 3 is depicted for sensing and displaying vehicle parameters derived from lateral or longitudinal acceleration.
In some applications, users prefer to install the detector on its lateral side rather than on its bottom, for instance for mounting against a vertical surface in the vehicle. Conse quently, routine 118 advantageously accommodates this installation by ?rst determining Whether the detector has been mounted on its side (“SIDE INSTALL”) (block 180).
This determination may be made by referencing a stored user setting or factory installed value. Alternatively, the detector may sense a constant lateral acceleration of approximately 1 G force consistent With gravity. If side installed in block 180, then the accelerometer is con?gured for side installation. For example, the lateral acceleration capabilities may be disabled or noted as a vertical accelera tion. Also, other display functions of the detector may be automatically altered to rotate characters for stacked vieW ing or to sWitch directions of a bar graph display (block 182).
 Routine 118 responds to a mute button being depressed in block 184 by clearing a G force peak hold. A further determination is made as to Whether the mute button has been held for an extended duration (e.g., held at least 1.5 seconds) (block 188), indicating a desire by the user for the detector to measure offset errors in the accelerometer, cali brate for the errors, and con?rm the calibration to the user by displaying a calibration status (block 190). If the mute button Was not held in block 188, then the acceleration mode is toggled betWeen forWard (longitudinal) and lateral. If the user only meant to clear peak hold by momentary depression
Apr. 10, 2003 of the mute button, the mute button may be depressed momentarily again to return to the previous axis (not
 The accelerometer has a predetermined sample rate. Consequently, a determination is made With reference to an internal clock or by sensing the signal from the accelerometer as to Whether it is time to read or measure the current acceleration (G) (block 194). If so, an acceleration counter is cleared that is used to trigger the next reading
When reaching a threshold corresponding to the accelerom eter output period. The accelerometer output period is recorded for use in calculating a pulse duty cycle that corresponds to acceleration. The X axis and Y axis pulse
Width signals are sensed and recorded by referencing the counter, Which in the illustrative embodiment comprises a logic 1 Wherein the pulse Width is de?ned betWeen a rising
 With the readings stored for both the X axis (for
Ward, longitudinal) and the Y axis (lateral), then a determi nation is made as to Whether forWard mode has been selected
(block 198). If so, the forWard G force is calculated by looking up the sensed pulse Width in the acceleration lookup table. If not forWard mode in block 198, then the lateral G force is calculated from the acceleration lookup table (block
202). Then the G force is displayed in the selected display format (e.g., NUM STD, NUM PEAK, BAR STD, BAR
PEAK). After block 204, or if not time to measure the G back in block 194, routine 118 returns for additional sWeeps and processing for alerts and acceleration readings.
 In use, the detector 10 is set to a pilot mode for sound pressure level (SPL) and/or acceleration. The detector
10 sWeeps With a front end portion 12 electromagnetic frequencies to receive signals characteristic of police traf?c surveillance devices (e. g., RF band, laser). In response to the back end portion 14 detecting a received signal, the con troller 28 initiates an alert on the display 18 and the speaker
48. When no alert is necessary, the controller 28 receives an
SPL signal from music or road noise from SPL circuitry 54 and adjusts the gain setting to the SPL circuitry 54. An economical microphone 52, similar to those used in cordless telephones, senses the SPL and an operational ampli?er 64 ampli?es the SPL signal from the microphone 54 to a level suitable for input to an analog-to-digital converter, either discrete or integral to the microcontroller 28, prior to digital processing and display. To obtain a larger dynamic range of
75 dB, gain resistors are sWitched to maintain the signal in the proper operating range of the analog-to-digital converter.
The approach leads to an economical SPL capability for less than $1.00 in variable cost to each detector 10.
 The SPL signal is converted to a selected display format by the controller 28 and displayed on display 18. For example, four SPL modes may be provided in one exem plary embodiment of the invention. In such an embodiment, a numeric averaged meter mode displays SPL in a range covering 70 to 145 dB that is ?ltered for display similarly to
SPL until cleared by depression of the mute button 40 or displays SPL in a range of 70 to 115 dB, Which is the listening range for most users. For seven alphanumeric segments having a ?ve-by-seven pixel, each pixel illumi mode display SPL in a range of 70 to 145 dB, Which advantageously alerts a user to SPL that may damage the ears. For the same alphanumeric segments, each pixel cor responds to a 2 dB increment.
 Alternatively or in addition to SPL modes, the controller 28 may receive acceleration signals in longitudi nal and lateral axes from an accelerometer 66 and display the value in the selected display format. Thus, car enthusiasts are able to see hoW fast their cars can go and hoW quickly they can accelerate. For example, traditional measures of automobile performance may be displaced by calculating a
0 to 60 mph. time and a quarter mile time based on the longitudinal acceleration.
 As an example, an exemplary implementation of the detector 10 may include six pilot modes for various acceleration-based calculations that may be displayed. In such an implementation, a numeric forWard acceleration mode displays acceleration and deceleration in numeric form. The mode is capable of displaying increments of 1/100 of a G force. Aplus (+) symbol indicates acceleration and a minus (—) sign indicates deceleration. A numeric lateral acceleration mode displays lateral acceleration in incre ments of 1/100 of a G force, With a plus (+) sign indicating a leftWard acceleration and a minus (—) sign indicating a rightWard acceleration. SWitching betWeen forWard and lat eral acceleration modes is accomplished by pressing the mute button 40 on the detector 10 When in either pilot mode.
Abar graph forWard acceleration mode has the 0 G point at the leftmost alphanumeric segment With an increase in acceleration increasing to the right. Aplus (+) sign indicates acceleration and a minus(—) sign indicates deceleration. A bar graph lateral acceleration mode has the 0 G point centered, With leftWard acceleration being represented by a leftWard bar graph and With rightWard acceleration being represented by a rightWard bar graph. In 0-to-60 m.p.h. time mode, the time required for the vehicle to accelerate from a stop to 60 miles per hour is calculated and then displayed in numeric form. In quarter mile time mode, the detector 10 displays the time that it takes for the vehicle to traverse a quarter mile distance. The detector 10 is placed in this mode and the mute button 40 is depressed When the user is ready.
As soon as the detector 10 senses acceleration, a clock timer is started. The detector 10 integrates the acceleration to calculate the velocity and integrates the velocity to calculate the distance. When the distance equals a quarter mile, the mode is used for the acceleration modes Wherein the user positions the vehicle on ?at ground and depresses the mute button 40 for more than tWo seconds, calibrating the detector
10 for 0 G force.
 By virtue of the foregoing, a detector 10 detects and provides additional sensing and display of at least one vehicle condition (e.g., SPL, acceleration) Without impairing detection of RF and/or laser signals characteristic of police traffic surveillance devices. Thereby, the detector 10 is capable of providing valuable information to the user With out the additional expense and inconvenience of integrating
 While the present invention has been illustrated by a description of various embodiments and While these embodiments have been described in considerable detail, it is not the intention of the applicants to restrict or in any Way
Apr. 10, 2003 limit the scope of the appended claims to such detail.
Additional advantages and modi?cations Will readily appear to those skilled in the art. The invention in its broader aspects is therefore not limited to the speci?c details, rep resentative apparatus and method, and illustrative eXample shoWn and described. Accordingly, departures may be made from such details Without departing from the spirit or scope of applicant’s general inventive concept.
What is claimed is: a display; a receiver operably con?gured to sense electromagnetic signals in at least one frequency band characteristic of police traffic surveillance devices; a sensor con?gured to sense a vehicle parameter associ ated With a vehicle Within Which the detector is located; and a controller con?gured to initiate an alert in response to a sensed electromagnetic signal and to initiate depiction by the display of a sensed vehicle parameter.
2. The detector of claim 1, Wherein the controller is con?gured to detect and to display a peak, average, or real time value of the sensed vehicle parameter.
3. The detector of claim 1, Wherein the controller is con?gured to initiate depiction by the display of the sensed vehicle parameter as a bar graph.
4. The detector of claim 3, Wherein the controller is con?gured to detect a peak, average, or real time value of the sensed vehicle parameter and to update the display of the bar graph to the peak, average, or real time value.
5. The detector of claim 1, further comprising a housing that encompasses the display, receiver and controller,
Wherein the sensor is remotely positioned from the housing.
6. The detector of claim 1, further comprising a housing that encompasses the display, receiver, sensor, and control ler.
7. The detector of claim 1, Wherein the controller is con?gured to initiate the alert by displaying the alert on the
8. The detector of claim 1, Wherein the sensor comprises a sound pressure transducer for sen sing a sound pressure vehicle parameter.
9. The detector of claim 8, further comprising sound measuring circuitry including a gain ampli?er for amplify ing the sensed sound pressure, Wherein the controller is further con?gured to sense a level of the sensed sound pressure and to command a selected gain by the gain ampli?er in response thereto.
10. The detector of claim 9, Wherein the sound measuring circuitry further comprises peak hold circuitry operative to sense a peak level of the sensed sound pressure, Wherein the controller is further con?gured to selectably reset the peak hold circuitry.
11. The detector of claim 9, Wherein the sound pressure transducer comprises an audio speaker, Wherein the control ler is further con?gured to initiate the alert as an audible output by the audio speaker.
12. The detector of claim 1, Wherein the sensor comprises an accelerometer for sensing an acceleration vehicle param eter.
13. The detector of claim 12, Wherein the controller is con?gured to display the sensed acceleration vehicle param eter.
14. The detector of claim 12, Wherein the controller is further con?gured to calculate a current velocity based on the sensed acceleration vehicle parameter.
15. The detector of claim 14, Wherein the controller is further con?gured to track and display a time required for the current velocity to reach a velocity threshold.
16. The detector of claim 15, Wherein the controller is further con?gured to track and display the time required for the current velocity to go from 0 to 60 miles per hour.
17. The detector of claim 14, Wherein the controller is con?gured to calculate and to display a time required to travel a distance in response to the sensed acceleration vehicle parameter and to the calculated current velocity.
18. The detector of claim 17, Wherein the controller is con?gured to calculate and to display a time required to travel a quarter mile in response to the sensed acceleration vehicle parameter and to the calculated current velocity.
19. The detector of claim 12, Wherein the controller is further con?gured to respond to an aXis selection operation to calculate and to display a selected one from a group consisting of lateral acceleration and longitudinal accelera tion.
20. The detector of claim 19, Wherein the aXis selection operation comprises a user input selection.
21. The detector of claim 19, Wherein the aXis selection operation comprises installation of the detector on a lateral side, Wherein the detector is further con?gured to respond to a constant one G force lateral acceleration by determining the aXis selection operation to be longitudinal acceleration.
22. The detector of claim 21, Wherein the detector is further con?gured to respond to a constant one G force lateral acceleration by rotating alphanumeric characters dis
23. The detector of claim 12, Wherein the controller is further con?gured to calibrate a currently sensed accelera tion vehicle parameter to 0 G force in response to a user
24. A method of detecting a police traf?c surveillance device With a detector, comprising: receiving electromagnetic signals in at least one fre quency band characteristic of the police traf?c surveil lance device; sensing a value of a vehicle parameter; generating an alert on the detector in response to detecting a received electromagnetic signal; and displaying on the detector the sensed value of the vehicle parameter.
25. The method of claim 24, Wherein sensing the vehicle parameter comprises sensing sound pressure.
26. The method of claim 25, further comprising: amplifying an input signal of the sensed sound pressure; and changing the ampli?cation of the input signal in response to the ampli?ed input signal approaching an operating limit.
27. The method of claim 24, Wherein sensing the vehicle parameter comprises sensing acceleration.
Apr. 10, 2003
28. The method of claim 27, further comprising: calculating a selected one of a group consisting of lateral acceleration and longitudinal acceleration.
29. The method of claim 28, Wherein calculating the selected one comprises calculating longitudinal accelera tion, the method further comprising: calculating an integral value of the longitudinal accelera tion for velocity; and displaying a time required for the integral value to reach a selected threshold.
30. The method of claim 28, Wherein calculating the selected one comprises calculating longitudinal accelera tion, the method further comprising; calculating an integral value of the longitudinal accelera tion for velocity; calculating the velocity integral value for distance; and displaying a time required for the distance integral value to reach a selected threshold. a display; a receiver operably con?gured to sense electromagnetic signals in at least one frequency band characteristic of police traf?c surveillance devices; an acceleration sensor con?gured to sense an acceleration vehicle parameter associated With a vehicle Within
Which the detector is located; a sound pressure level sensor con?gured to sense a sound pressure level vehicle parameter associated With the vehicle Within Which the detector is located; and a controller con?gured to initiate an alert in response to a sensed electromagnetic signal and to initiate depiction by the display of a sensed sound pressure level and acceleration vehicle parameter.