4.1.7. SCR_LO_THR (SCR Low Background Noise Threshold)

Parameter Number: 0x419

Description: The SCR_LO_THR parameter is used for Silence Compressed Recording and controls the low threshold for background noise estimation and, along with SCR_HI_THR parameter, forms a range of loudness. Any signal below this threshold is declared silence. Increasing this threshold increases the probability of losing speech and decreases the probability of recording noise.

SCR_LO_THR is defined as:

• 10^{(dB value/20)} * 2²³

Note: Multiplying by 2²³ converts the value into a linear 24-bit value that accommodates the 24-bit DSPs used on the DM3 boards.

For example, for a low noise threshold of -78 dB, SCR_LO_THR would have a value of:

• 10^(-78/20) * 2²³ = 1057

Values: 839 to 83887 (-80 dB to -40 dB)

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