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5-1-4 Audio Part
The
MSM6000
integrates
Codec into Mobile Station Modem. The integrated
Codec contains all of the required conversion and
amplification stages for the audio front end. The
Codec operates as a 13bit linear Codec with the
transmit (TX) and receive (RX) filters designed to
meet
ITU-TG.712
requirement.
contains the software controller amplifier for both
the receiving and transmitting sections. Also, the
vocoding schemes used will be IS-127 EVRC. The
EVRC vocoder is based in the MSM internally.
TX AUDIO PATH
The voice signal from the microphone is inputted
to the internal CODEC. The voice signal is then
amplified by the internal amplifier and is converted
to PCM data to be outputted to the MSM as 13bit
data. This data is then processed by the MSM
(U100)'s internal.
RX AUDIO PATH
The PCM data from the MSM (U100)'s internal is
inputted to the internal CODEC and the data will
be decoded by the internal DAC and audio levels
are adjusted by the amplifier. The final audio is
then sent to the audio receiver.
an
audio
voiceband
The
CODEC
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ALERT
TONE
CIRCUITRY
A speaker generates alert tone and melody. When
the MSM (U100) receives the data, it generates
alert tone and melody. Ringer signal generated in
MSM6000 is intended to drive a speaker.
KEY TONE GENERATOR
The CODEC data out from the MSM6000 is
converted to DTMF signal by TONE generator of
internal CODEC, is then amplified by the internal
audio amplifier to be sent to the speaker unit.
5-3
Circuit Description
AND
MELODY
DRIVING
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