6-1-4 Audio Part
TX AUDIO PATH
The voice signal output from microphone is
filtered and amplified by the internal OP-AMP
and is converted to PCM data by the CODEC
(U117). This signal is then applied to the MSM
(U101)'s internal vocoder.
RX AUDIO PATH
The PCM data out from the MSM is converted to
audio signal by ADC of CODEC (U117), is then
amplified by the speaker amplifier (U111) to be
sent to the speaker unit.
FM TX PATH
Pre-Emphasis Circuit
The circuit fe6dB/oct to reduce signal loss
and noise in Tx path.
Compressor
The compressor features 2:1 level to reduce signal
loss and noise in Tx path. The zero crossing level
of the compressor is 2.9 kHz/dev, attack time is
3 mS, and release time is 13.5 mS.
Limiter
The limiter performs to cut 0.53 Vp-p or higher
audio signal level so that the FM frequency
deviation is not over 12kHz/dev. The function
is used to avoid confusion over phone line. LPF is
used to reduce a specific high frequency of limited
signal.
RX AUDIO PATH
De-Emphasis Circuit
This circuit is 1st LPF featuring -6dB/oct to reduce
signal loss and noise in Rx path.
Expander
The expander features 1:2 level to reduce signal
loss and noise in Rx path. The zero crossing level
of the expander is 2.9 kHz/dev, attack time is 3
mS, and release time is 13.5 mS.
Volume Adjust
Volume can be adjusted up to 4 steps for the user
to obtain a proper loudness of received signal.
6-1-5 TX WBD, ST, And SAT
These signals are generated from MSM. The
modulation level of TX WBD and ST is
8kHz/dev, and SAT is 2kHz/dev.
6-1-6 Buzzer Driving Circuitry
Buzzer generates alert tone. When the buzzer
receives the timer signal from the MSM, it
generates alert tone. The buzzer level is adjusted
by the alert signal's period generated from the
MSM timer.
6-1-7 Key Tone Generator
Ringer signal (pin 49) out from MSM (U101) is
passed through 2 serial LPF consisting of R141,
C145, R145, and C142, amplified at the speaker
amp (U111), and comes out to speaker. In hands-
free mode, the key tone is applied to RX audio line
through the LPF and C153, R142.
Circuit Description
6-4
Samsung Electronics - Contents may change without notice.
Summary of Contents for SCH-210
Page 2: ...Samsung Electronics Co Ltd GH68 60756A ...
Page 4: ...1 2 Samsung Electronics Contents may change without notice General Introduction ...
Page 10: ...Specification 2 6 Samsung Electronics Contents may change without notice ...
Page 16: ...Installation 3 6 Samsung Electronics Contents may change without notice ...
Page 22: ...4 6 Samsung Electronics Contents may change without notice NAM Programming ...
Page 52: ...Troubleshooting 7 8 Samsung Electronics Contents may change without notice 7 2 2 CDMA Mode ...
Page 54: ...Troubleshooting 7 10 Samsung Electronics Contents may change without notice ...
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Page 68: ...8 14 Samsung Electronics Contents may change without notice Exploded View and its Parts List ...
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Page 100: ...Electrical Parts List 10 24 Samsung Electronics Contents may change without notice ...
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Page 102: ...11 2 Rapid Desk Top Charger Block Diagram DTC58 ...
Page 103: ...11 3 Hands free Kit Block Diagram ...
Page 104: ......
Page 105: ...11 4 Rapid Travel Charger Block Diagram ...
Page 106: ...11 5 CLA Cigarette Lighter Adaptor Block Diagram ...
Page 107: ...11 6 Logic Circuit Diagram ...
Page 108: ...11 7 Receiver Circuit Diagram ...
Page 109: ...11 8 Transmitter Circuit Diagram ...
Page 110: ...11 9 Desk Top Rapid Charger Circuit Diagram ...
Page 111: ...11 10 Hands Free Circuit Diagram ...
Page 112: ...11 10 1 Power Circuit Diagram ...
Page 113: ...11 10 2 Holder Circuit Diagram ...
Page 114: ...11 10 3 COMM CONT Circuit Diagram ...
Page 115: ...11 10 4 Audio Amp Circuit Diagram ...
Page 116: ...11 11 Cradle Circuit Diagram ...
Page 117: ...11 12 Car Adaptor Circuit Diagram ...
Page 118: ...11 13 Rapid Trvel Charger Circuit Diagram ...
Page 119: ...11 14 CLA Cigarette Lighter Adaptor Circuit Diagram ...