Detection Threshold; Record Application - Log Window - Rutter VDR-100G3 Installation Manual

A Perform Full MIC Test can be selected within the AudioConfigSuite utility under the Tests
menu. Numerous entries in the INI file are used to configure this process. During self-testing, the
system will:
Generate a tone from each microphone's buzzer;
Receive it on the microphone; and
Detect this tone in the captured data block.
The VDR-100G3 will perform self-testing of all microphone ports identified in the MikesOn MixerX
parameter of the INI file. For each 2-channel microphone port a "chirp" or buzzer test will be
performed on all buzzer block 1 microphones (ALL of the top channel inputs such as 3, 5, 7, 9,
11, 13, 15) followed by a test of the buzzer block 2 microphones (ALL of the bottom channel
inputs such as 4, 6, 8, 10, 12, 14, 16).
The number of microphones to test on each channel is set in the INI file using the Audio
Diagnostics Application. One microphone on each channel is tested simultaneously. Each audio
input channel (except the VHF channels) has its own detection threshold, which is loaded from
the INI file via the DetectionThreshold1, DetectionThreshold2, DetectionThreshold3,
DetectionThreshold4, DetectionThreshold5, DetectionThreshold6 parameters and so on.
To calculate the Detection Threshold, see Section 8.4.6 - Detection Threshold,
8.4.6

Detection Threshold

NOTE: Microphone testing requires careful planning. The Bridge Audio test must be
done during a quiet time on the bridge to prevent noise interference with the voice
recording. Such interference may make the test useless if is the noise levels are not
normal for the bridge.
The Detection Threshold level is a test value and does not have an affect on the level of the
audio recorded. It is used as a baseline for 2 measurements during the audio self-test.
1. The first measurement determines the average noise level.
2. The second measurement is for the detected microphone chirp or buzzer level—above
the detection threshold value—to determine if the microphone detected the buzzer.
8.4.6.1
NOTE: The Log Window will only display audio channels enables in the
<vdrparams.ini> file. The Audio data window will display an audio histogram
showing only the Audio channels enables
Example 1
During a buzzer1 audio test, the Log Window will read similar to the following:
Mike 1 test – chirp detected on channel 2 – 869.459 (359.906)
Mike 1 test – chirp detected on channel 3 – 869.459 (359.906)
Mike 1 test – chirp detected on channel 4 – 869.459 (359.906)
Mike 1 test – chirp detected on channel 6 – 1169.459 (659.906)
And during a buzzer2 audio test, the Log Window will read similar to the following:
Mike 2 test – chirp detected on channel 2 – 855.059 (359.022)
Mike 2 test – chirp detected on channel 3 – 869.459 (359.022)
Mike 2 test – chirp detected on channel 4 – 869.459 (359.022)
Mike 2 test – chirp detected on channel 6 – 1290.459 (659.022)
VDR-100G3/G3S Installation Manual
Chapter 8: Audio Module, Rev 1.1
Record Application – Log Window
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06/10/2008