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Hardware Integration Guide
AGC (Automatic Gain
Control)
DTMF tones
Comfort noise
Simple ringers
Voice memo
Polyphonic ringtones
Path switching
Path mixing
Transducer interfaces
Adjustable gain/volume
settings
DTMF/ringer tone
generation
4112719
Function
Normalizes audio volumes in varying acoustic environments
Generation and detection of DTMF tones is required in both
directions of the phone Interface
Low level noise injected into Rx path for user 'connection'
experience
Digital and analog tones, melody ringers, MIDI with limited
memory storage
Performed by host if significant memory storage is required
Host often supports WAV, MIDI formats with significant memory
storage
Turn on audio path depending on user interface selection, or
headset detection
Required for voice memo recording and playback via multiple
audio paths
Host provides acoustic drivers.
Must occur outside of path switching and mixing
Based on user interface selections
Rev 2.1
Audio Interface
Responsible
Codec
Module
Module
Module
Module
Host
Host
Host
Host
Host
Host/Module
Host/Module
January 07, 2013
17
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