User's Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
32 Proprietary and Confidential 2130114
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Audio function partitioning
Thesephone‐orientedfunctionsareusuallyundermodule
control:
• FIRfilters—bothtransmitandreceivepath
• Noisesuppression—requiredduetohighsensitivityand
gainintransmitpath
• Echocancellation—differentforeachaudiopathand
environment(handset,headset,carkit,speakerphone)
• Highpassfiltering/slopefilteringfunctions—requiredper
phoneacousticrequirements
• AGC(AutomaticGainControl)—normalizesaudio
volumesinvaryingacousticenvironments
• DTMFtones—thegenerationanddetectionofDTMFtones
isrequiredinbothdirectionsofthephoneinterface
• Comfortnoise—lowlevelnoiseinjectedintoreceiverpath
foruserʺconnectionʺexperience
• Simpleringers—digitalandanalogtones,melodyringers,
MIDIwithlimitedmemorystorage
Thesefunctionsaretypicallyperformedinthe hostcodec:
• VoiceMemo—performedbythehostifsignificantmemory
storageisrequired
• Polyphonicringtone—hostoftensupportsWAV,MIDI
formatswithsignificantmemorystorage
• Audiopathswitching—turnonaudiopathdependingon
userinterfaceselection,orheadsetdetection
SPK_P
5 Analog Output Non-inverted
speaker output (+)
SPK_N
7 Analog Output Inverted speaker
output (-)
Table 4-5: PCM digital audio signal interface
Signal Pin # Type Directions Description
PCM_CLK
45 Digital Output PCM clock
PCM_DIN
47 Digital Input (internal
pull-down)
PCM data in
PCM_DOUT
49 Digital Output PCM data out
PCM_SYNC
51 Digital Input (internal
pull-down)
PCM sync
Table 4-4: Primary audio signal interface
Signal Pin # Type Directions Description