4.1.5. SCR_PR_SP (SCR Speech Probability Threshold)

Parameter Number: 0x417

Description: The SCR_PR_SP parameter is used for Silence Compressed Recording and sets the threshold that the calculated probability of speech value is compared to in declaring speech. If the probability of speech is greater than this parameter, speech is declared.

The SCR_PR_SP parameter primarily affects the sensitivity of detecting speech at the leading time of a speech period verses false speech detection.

SCR_PR_SP is defined as:

• (Probability Value) * 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 speech probability threshold of 0.58, SCR_PR_SP would have a value of:

0.58 * 2²³ = 4865393

Values: 4194304 to 2²³ (0.50 to 1.00 probability)

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