Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual Glossary, References, Termination

AN93

Table 141. Speakerphone to Handset Transition (Continued)

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.

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.

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