4.20.27. PrmVolCtrl (Volume Control)

Parameter Number: 0x1b14

Description: The PrmVolCtrl parameter is used in conjunction with the PrmGainCtrl parameter to govern the signal power level of the decoded PCM data before it is transmitted onto the SCbus in the direction of the PSTN interface.

The PrmVolCtrl parameter is essentially a scale (attenuation) factor by which the signal is multiplied. It allows you to fine tune the signal level. If the volume seems too weak, increase the value. If the volume seems too strong, decrease the value. This parameter must assume a hexadecimal value corresponding to the digital signal processor's (DSP's) 24-bit fractional representation. The equivalent decimal values range between 0.0 and 0.999999.

To determine the hexadecimal value, multiply the desired decimal value by 2²³ and then convert that number into the corresponding hexadecimal value. For example, to define a volume control value of 0.7, multiple 0.7 by 2²³ (8388608) and convert the product to hexadecimal:

				0.7 * 8388608 = 5872025.6 (5872026) = 0x599D1E 

Values: 0x0 to 0x7fffff

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