AN93

Table 129. TAM Handset Record OGM

 

Modem to

 

Host to Modem Commands / Data

Host Result

Local Modem Actions

 

Codes/Data

 

 

 

 

AT:U199A

OK

Mute the microphone and speaker paths to

the codec.

 

 

 

 

 

 

 

Configure Si3000 Register 1:

 

 

Enable speaker driver

AT:U72,0110

OK

Disable line output driver

 

 

Disable telephone instrument driver

 

 

Enable MBIAS output

 

 

 

 

 

Configure Si3000 Register 5:

 

 

10 dB Line In gain

 

 

Mute Line In

AT:U72,05B3

OK

20 dB MIC input gain

 

 

Enable MIC input

 

 

Mute telephone instrument input

 

 

Enable IIR filter

 

 

 

 

 

Configure Si3000 Register 6:

AT:U72,065C

OK

0 dB RX PGA gain

Disable Line Out

 

 

 

 

Disable telephone instrument output

 

 

 

 

 

Configure Si3000 Register 7:

AT:U72,075E

OK

0 dB RX PGA gain

Enable SPKRL

 

 

 

 

Mute SPKRR

 

 

 

 

 

Configure Si3000 Register 9:

AT:U72,0900

OK

0 dB Line Out attenuation

 

 

0 dB Speaker output attenuation

 

 

 

AT+VGR=128

OK

Set the Si3000-to-RS232 receive gain

(UC0) for TAM Hands-Free.

 

 

 

 

 

 

 

Restore Si3000-to-DAA transmit gain path

AT:U0B1,0500

OK

to allow voice samples to reach FDV block

for silence detection. This allows the driver

 

 

 

 

to automatically end OGM recording.

 

 

 

AT+VSD = 129

OK

Set sensitivity level for OGM recording

silence detection.

 

 

 

 

 

 

 

Select G.711U μ-law PCM, 8-bit, 64 kbps

AT+VSM = 4

OK

format. The voice driver will need to track

 

 

the OGM format with the OGM PCM file.

 

 

 

AT+VTS = [1000,0,100]

OK

Play user record tone prompt.

 

 

 

AT:U1998

OK

Mute speaker.

 

 

 

AT:U199&FFFD

OK

Enable microphone for OGM recording.

 

 

 

 

 

 

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Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual TAM Handset Record OGM