Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 223)

AN93
Rev. 1.3 223
7.7.11. Termination
A SP Button Off Event (Handset On-Hook) will cause the system to return to the TAM Hands-Free mode. Use the
same configuration listed in Table 124 on page 199. Note the voice driver is responsible for tracking the handset
hook-switch state.
7.8. Glossary
 AEC Acoustical Echo Canceller of speakerphone
 AES Acoustical Echo Suppressor of speakerphone
 Convergence Rate Rate at which AEC or LEC converges
 DCE Data Circuit-terminating Equipment
 DLE Data Link Escape (0x10)
 DTE Data Terminal Equipment
 DTD Double talk detector of AEC or LEC
 Double-Talk Both the near-end and far-end users talk
 ETX End of Text (0x03)
 ICM Incoming Message
 LEC Line Echo Canceller of speakerphone
 OGM Outgoing Message
 PSTN Public Switch Telephone Network
 Single-Talk Either the near-end or far-end user talks
 TAM Telephone Answering Machine
7.9. References
 ITU-T G.711 Pulse code modulation (PCM) of voice frequencies – 11/1998
 ITU-T G.726 40, 32, 24, 16 kbit/s adaptive differential pulse code modulation (ADPCM) – 12/1990
 ITU-T V.253 Control of voice-related functions in a DCE by an asynchronous DTE - 02/1998.
AT:U72,0900 OK Configure Si3000 Register 9:
0 dB Line Out attenuation
0 dB Speaker output attenuation
AT+VSP=0 OK Select handset voice path. See Figure 29 on
page 188 for details.
AT:U199&FFF5 OK Enable the microphone and speaker paths
to the codec.
Table 141. Speakerphone to Handset Transition (Continued)