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RED EPIC OPERATION GUIDE
APPENDIX E: AUDIO SUBSYSTEM INFORMATION
AUDIO FORMAT
The audio format is always either 2 or 4 channels of 24-bit audio data recorded at 48kHz. The audio data is embedded in the R3D file and can be exported from REDCINE-X into separate audio files.
CHANNEL SETUP
The audio channels are set up under SETTINGS > AUDIO > AUDIO CHANNELS. Separate tabs exist to set up the channel 1/2 and channel 3/4 properties.
SOURCE SELECTION
Audio is always recorded at channel pairs. Each of the two channel pairs can be assigned to one of the following sources:
None
Camera Analog Microphone Input (Cam Analog)
Pro I/O Analog Microphone/Line In Input (Pro I/O Analog)
Pro I/O AES A or AES B Digital Input (Pro I/O AES A)
NOTE: AES A can only be assigned to channel 1/2, and AES B can only be assigned to channel 3/4.
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CHANNEL MODES
The analog sources can be set to different modes to match the incoming audio signals. The following camera input modes are available: BALANCED MICROPHONE, UNBALANCED MICROPHONE. If you’re using the PRO-I/O MODULE, these additional modes are also available: LINE IN 0 DBU and LINE IN 0 VU
BALANCED MICROPHONE
Balanced microphone input. Usually used with microphones that provide XLR connectors and have an internal battery. If you select BALANCED, you can enable the 48V Phantom Power.
UNBALANCED MICROPHONE
Unbalanced microphone input with 3.3V bias. This type of input is usually provided by unpowered
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RED EPIC OPERATION GUIDE microphones with 3.5 mm TRS plug.
LINE IN 0 DBU
Fixed input gain with limiter settings if limiter is enabled. (Only available with the PRO-I/O MODULE.)
LINE IN 0 VU
Same gain as 0 dBu but different compression/limiter settings if enabled. If no limiter is enabled, Line In 0 dBu and Line In 0 VU behave the same. (Only available with the PRO-I/O MODULE.)
PHANTOM POWER
Audio inputs that are set to BALANCED MICROPHONE input can enable the 48V phantom power on a perchannel basis.
NOTE: Phantom Power is not available on non-upgraded EPIC-M’s and early EPIC-X. If your camera does not allow you to select PHANTOM POWER, please contact your Bomb Squad representative for upgrade information.
LIMITER
A limiter can be added to the analog input signal chain that adds about 12dB dynamic headroom to avoid clipping on signal spikes. While it is best practice to use an external audio mixer to control the signal strength the limiter can be used in more dynamic environments where an external mixer is not practical to reduce the risk of clipped audio samples.
NOTE: The limiter is not available on non-upgraded EPIC-M’s and early EPIC-X. Please contact your Bomb
Squad representative for upgrade information.
AUDIO RECORDING
Audio Recording is enabled if any of the input channel pairs are set to anything other than NONE. For successful audio recording, the following parameters need to be set correctly:
At least one channel pair has a currently present source selected
Input gain is set correctly so that the Peak Meter shows valid data
None of the following modes are enabled:
Varispeed mode (framerate differs from project rate)
Single frame MoCo mode
Timelapse mode
Ramp mode
Single frame stills mode
NOTE: Even if audio is not recorded (in varispeed, single frame, timelapse, or ramp mode), audio will be passed through to the headphones.
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PEAK METER
The peak meters always show the incoming audio signal, no matter if the channel is recorded or not, as long as a source is selected.
Actively recorded channels are drawn with a lighter outline and the channel indicator left of the peak meter will be green.
The peak meters are updated 12 times per second with the maximum signal from the last 1/12 of a second period. In case the input signal exceeds 19dBu the whole bar will be filled with red.
The total range of the peak meter is -36 dB to 20dB. (Values below 0 dB are shown with half resolution) For reference the following markers are supplied on the peak meter: Solid marker at 0 dB, Dashed marker at
4,10,14,18 dB.
Channel 1/2 Enabled for Recording
Channel 1 Around 5dB
Channel 2 Clipping
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DATA PATH
The following diagram outlines the data flow in Preview. The only difference in playback is that the data comes from the R3D file and the input channel selection is disabled.
HD-SDI/HDMI EMBEDDED AUDIO
HDMI/HD-SDI audio output is limited to the first two channels and the channels will be the same between
HDMI and HD-SDI.
AUDIO CONTROL
Audio channel level inputs are displayed in the lower section of the screen. When audio is enabled, the circle next to CH1, CH2 etc… will be Green and the box around the signal will be highlighted.
When setting the levels for Camera, Rear, and Monitor Mix, the VU meter will show the output levels for these ports. The display can be permanently switched to display the audio levels for the output, which is helpful in external recording mode. To toggle the VU Meter Source between input and output, go to
SETTINGS > DISPLAY > MODES.
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P RE-A MP
Allows you to adjust pre-amplifier levels. Range 30 to 60 dB.
HEA DPHO NE
Allows you to adjust levels for headphones that you plug into the DSMC brain. Range -28 to -0 dB.
The headphone output volume can be set individually for each channel. (Or can be linked together as the input gain controls.)
Additionally, the output of each channel may be muted individually.
The signal strength of the line out cannot be controlled and is fixed at -15 dB gain. Line input will pass without gain through the system.
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CAM MI X, REA R M IX, A ND M O NI TO R MI X
Cam Mix (Camera Mix): Controls audio for the camera.
Rear: Controls audio for any rear module, such as the PRO I/O MODULE. The input gain is fixed.
Monitor: Controls audio for all monitors that provide audio.
Audio tracks may be assigned to the Left, Middle, or Right side of a stereo mix.
Additionally each channel can be enabled/disabled independently in the output mix.
As this is a digital mixer, each output is normalized to not exceed the output signal range. This means that if for example 1 channel is passed through to an output and a second channel is mixed into the same output, the level of the first channel will drop to half.
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AUDIO DURING PLAYBACK
During playback the same audio controls for the volume out and the headphone and Pro I/O mixer are available. All channels recorded will be played back.
Audio output will be unmuted automatically when entering playback mode.
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