RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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1070
No. 77
Speakerphone Transmit Speech Hangover
In order to avoid choppy sounds for weak voice signals whose energy is not much different from the noise floor, a minimum
ON time (hangover) is usually added to the speech detector. When speech is gone, the hangover will be gradually
decremented to 0. The default value is loaded each time the modem is configured to Speakerphone Mode (CONF = 91h.)
Format:
16 bits, positive, two's complement
Equation:
Hangover = 8 * x
Where:
x = desired hangover time in ms.
Range:
0001h - 0FA0h
Default Value:
0640h (200 ms)
No. 78
Speakerphone Receive Speech Hangover
In order to avoid choppy sounds for weak voice signals whose energy is not much different from the noise floor, a minimum
ON time (hangover) is usually added to the speech detector. When speech is gone, the hangover will be gradually
decremented to 0. The default value is loaded each time the modem is configured to Speakerphone Mode (CONF = 91h.)
Format:
16 bits, positive, two's complement
Equation:
Hangover = 8 * x
Where:
x = desired hangover time in ms.
Range:
0001h - 0FA0h
Default Value:
0960h (300 ms)
No. 79
Speakerphone Volume Range
The volume control provides a 2 dB loss to the XIA DAC output each time control bit VOLDWN (OE:5) is set. The
speakerphone volume range parameter limits the maximum loss.
Format:
16 bits, positive, two's complement
Equation:
(10
[(x+1)/20]
)(32768)
Where:
x = lower range limit in dB
Range:
0004h - 7FFFh
Default Value:
048Bh (-30 dB)
No. 80
Speakerphone Line Volume Control
The speakerphone line volume control allows the host to change the transmit output level of the IIA DAC without causing
instability in the speakerphone algorithm’s gain balance. Access No. 10, Transmit Output Level (Ps), should not be used for
this purpose.
Format:
16 bits, positive, two's complement
Equation:
Loss = (10[x/20])(32767)
Where:
x = desired loss in dB.
Range:
0000h - 7FFFh
Default Value:
7FFFh (0 dB)
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