Hello,
I am not sure if this is the best place to post this, but hopefully I can get some helpful input on this topic.
I have a somewhat unique audio setup that we use for a web based AV software application that is used to record encounters and then go back and watch/debrief them later on.
All of the cameras are network based. We use a network audio encoder to capture audio and that feed is linked to each camera that is in the room.
For now we are setting the gain on each audio encoder by listening with headphones on a laptop. The encoder offers a hardware gain knob and software gain adjustments. We try to set the gain as close as possible with the hardware knob and then use the software adjustment for fine tuning(it adjusts in increments of 3dB).
What I would like to do is standardize the calibration of these in each room so that we can get equal sound in each room. I know that the settings will vary from room to room, but I am hoping to find some type of solution to get it as close as possible.
The audio encoder that we use is an Axis P8221(link below). This device is a surveillance device, but we have found that it provides great audio for our purposes. We pair this with an Audio Technica Pro44 boundary microphone that is mounted on the ceiling against one of the walls in the room. We do our best to stay away from AC vents and return air, but sometimes we do have issues with these type of things.
My first thought was to use a tone generator on an iPhone app to create a standard tone that the microphone could pick up. What I am not sure about is how far away would you have the phone playing the test tone to ensure it is at 0dB. The best way to figure that would be to play the test tone and measure with a dB meter, correct? Say the distance is 3ft. Then you would play the test tone 3 ft. from the microphone and adjust the hardware gain adjustment until you see the LED light flash amber/red(The LED indicator will flash amber when the audio is between -3dB and -1dB. Anything over -1dB and it goes red. These steps would be done in the room after the microphone has been mounted in hopes to factor in AC and ambient noise.
After the hardware gain adjustment we would then go back and listen through the headphones on a laptop with some sort of spoken word recording playing in the background to do any fine tuning of the gain in the software.
Am I on the right track with this? Is there a better way to do this that doesn't require a ton of audio gear? Any and all suggestions are welcome.
AXIS P8221 Network I/O Audio Module | Axis Communications
PRO 44 Cardioid Condenser Boundary Microphone || Audio-Technica US
I am not sure if this is the best place to post this, but hopefully I can get some helpful input on this topic.
I have a somewhat unique audio setup that we use for a web based AV software application that is used to record encounters and then go back and watch/debrief them later on.
All of the cameras are network based. We use a network audio encoder to capture audio and that feed is linked to each camera that is in the room.
For now we are setting the gain on each audio encoder by listening with headphones on a laptop. The encoder offers a hardware gain knob and software gain adjustments. We try to set the gain as close as possible with the hardware knob and then use the software adjustment for fine tuning(it adjusts in increments of 3dB).
What I would like to do is standardize the calibration of these in each room so that we can get equal sound in each room. I know that the settings will vary from room to room, but I am hoping to find some type of solution to get it as close as possible.
The audio encoder that we use is an Axis P8221(link below). This device is a surveillance device, but we have found that it provides great audio for our purposes. We pair this with an Audio Technica Pro44 boundary microphone that is mounted on the ceiling against one of the walls in the room. We do our best to stay away from AC vents and return air, but sometimes we do have issues with these type of things.
My first thought was to use a tone generator on an iPhone app to create a standard tone that the microphone could pick up. What I am not sure about is how far away would you have the phone playing the test tone to ensure it is at 0dB. The best way to figure that would be to play the test tone and measure with a dB meter, correct? Say the distance is 3ft. Then you would play the test tone 3 ft. from the microphone and adjust the hardware gain adjustment until you see the LED light flash amber/red(The LED indicator will flash amber when the audio is between -3dB and -1dB. Anything over -1dB and it goes red. These steps would be done in the room after the microphone has been mounted in hopes to factor in AC and ambient noise.
After the hardware gain adjustment we would then go back and listen through the headphones on a laptop with some sort of spoken word recording playing in the background to do any fine tuning of the gain in the software.
Am I on the right track with this? Is there a better way to do this that doesn't require a ton of audio gear? Any and all suggestions are welcome.
AXIS P8221 Network I/O Audio Module | Axis Communications
PRO 44 Cardioid Condenser Boundary Microphone || Audio-Technica US
Setting gain on network audio encoder
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