Arri Alexa Sound Help

Arri Alexa Sound Help

I collected the sections of the Arri Alexa Manual that relate to Arri Alexa Sound. Feel free to bookmark this page so you can have an easy reference when working with the Alexa.

Also Check Out: Arri Alexa and All Other Camera Audio and Timecode Inputs and Outputs

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Screen Shot 2013-11-11 at 21.54.52

 

AUDIO Shows the current audio level. If AUDIO is set to Off, the audio input is switched off: no audio is embedded in the HD-SDI outputs, and no audio tracks are recorded on the SxS PRO cards. The same applies if AUDIO is disabled, which is the case if the sensor frame rate is different from the project fps setting

(for example, while over or undercranking).

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TC Displays the current time code including the source (INT: internal, EXT: external source). Frames are not displayed.

The timebase of the time code is shown after the @ sign.

Camera is set to Ext sync: MASTER

Camera is set to Ext sync: SLAVE

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Press the AUDIO  button on the HOME screen to open the AUDIO screen. This screen shows the ALEXA’s two audio channel levels. The audio levels are displayed from -45 dBFS to 0 dBFS.

Note: No audio meters are displayed on the HOME screen or AUDIO screen when audio is set to Off or audio is disabled. Audio is disabled when the sensor frame rate does not match the project frame rate.

Arri Alexa Sound.

 

 

 

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Screen Shot 2013-11-11 at 21.44.36 Light blue markers show reference levels of -20, -18 and -9 dB FS.

Red markers at levels -1 and 0 dBFS warn of clipping. With a proper

audio signal levels, the red markers should almost never be visible.

Gain can be applied to the audio channels by turning the jogwheel to

set both channels, or by pressing the CH 1+ , CH 1- , CH 2+  and CH 2-

buttons. The amount of gain applied by the camera is indicated next to

the levels as light gray numbers.

 

 

Arri Alexa Sound

 

 

Press the OPTIONS  button to open the AUDIO IN>OPTIONS screen and set audio parameters.

Record - Turns audio recording On or Off.

If audio recording is switched off, no audio is recorded internally, the HD-SDI contains no audio and the Audio out is muted.

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Channel 1 level Manual - allows the user to manually apply gain to the input signal on channel 1 to reach a correct level. Unity matches a 4 dBu input signal to -20 dBFS. This setting leaves enough headroom for recording and avoids audio clipping.

When Unity is selected, audio levels cannot be adjusted by the user.

Channel 2 level Manual  - allows the user to manually apply gain to the input signal on channel 2 to reach a correct level. Unity matches a 4 dBu input signal to -20 dBFS. This setting leaves enough headroom for recording and avoids audio clipping.

When Unity is selected, audio levels cannot be adjusted by the user.

Channel 1 source - Select the left or right input signal as the source for Channel 1.

Channel 2 source - Select the left or right input signal as the source for Channel 2.

Soundroll (=Tape) Enter a name for the sound roll (also known as Tape in the menus of some recorders) of an external audio recorder, for easier sound synching in post-production. The name will be written to the FCP XML file and the Avid Log Exchange (ALE) file on the recording media.

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Press the AUDIO OUT  button to open the AUDIO OUT>OPTIONS screen

where the global volume for both Audio out channels can be adjusted.

The OPTIONS  button opens a list of AUDIO OUT options.

 

 

 

 

Screen Shot 2013-11-11 at 21.50.58

Left out - Sets which channel is routed to the left output.

Right out - Sets which channel is routed to the right output.

Audio out level - Set the level of the audio out channels manually, or set it to fix the maximum output.

Note: These settings do not influence the audio signal embedded in the HD-SDI connectors or recorded in QuickTime clips. They only affect the AUDIO OUT connector!

Note: ALEXA automatically determines the internal signal run time and matches audio and images so they are always in sync. When changing sensor fps or project fps, it may take up to 2 seconds for the camera to resync image and audio signals.