4.1.8. SCR_HI_THR (SCR High Background Noise Threshold)

Parameter Number: 0x41a

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

SCR_HI_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 high noise threshold of -20 dB, SCR_HI_THR would have a value of:

• 10^(-20/20) * 2²³ = 838861

Values: 83887 to 2²³+ (-40 dB to 0 dB)

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