27.1.1999
4A0701GB.__1
10
Product: TDP-52-SN3 (Sigma Gold) / OA0700 Audio
Audio
5.1.5 Function Description
OA0700 Audio
The audio module is comprised of the following functions:
1. TX-audio signal handling
2. RX-audio signal handling
3. Fii signal handling
4. FFSK modem
5. DTMF generator/receiver
6. Signal level detectors
7. Compander
8. Expander
9. Buzzer
The audio functions are mainly located in a single circuit AK2339. This chip
from AKM is controlled by a serialbus. It is possible to shut down parts of the
circuit, one block at a time to minimise power consumption.
5.1.6 TX-audio
The input from the microphone is fed to the audio circuit I405 pin 61, which is
an operational amplifier (AMP1) inverting input. The operational amplifier gain
is set by resistors R413 and R416. The amplifier is connected as a low pass
filter. After the amplifier is the microphone switch and then summing junction of
MIC input signal, EXTMIC input signal and transmit DTMF signal. VR1 is a
programmable amplifier, which sets the microphone signal (sensitivity) to the
correct level. After VR1 comes band-pass filter for transmitting the voice signal.
After the TXBPF is the summing junction (AMP6) of the tx signal and transmit
answer signal (ANAOUT). TXDET is the transmit voice signal detection circuit
which works as a full wave rectifier. Next comes ATT1 which is an attenuate
circuit to set the transmit signal level in the HF-mode. COMP is the compressor
circuit. Compress the transmitting signal amplitude with square root law. It can
be hypassed. The linearity is adjustable by the control register CVR. Next is
VR2, normal deviation gain control circuit to set the signal level. The P/E &
LIMIT pre-emphasis circuit and limiting circuit, emphasize the higher frequency
component of the signal in order to improve the signal-to-noise ratio of
modulated signal. This block includes a limiting circuit for signal amplitude in
order to confine the maximum deviation of the transmit modulated signal.
TXLPF is the low pass filter to reject the higher frequency component on the
Содержание SIGMA GOLD TDP-52-SN3
Страница 1: ...27 1 1999 Dp_52ngbTOC fm 1 Product TDP 52 SN3 SERVICE MANUAL BENEFON SIGMA GOLD TDP 52 SN3 ...
Страница 12: ...27 1 1999 2DP_52GB 7 Product TDP 52 SN3 General Line interface Branching unit LIF 40 DB 40 ...
Страница 14: ...27 1 1999 2DP_52GB 9 Product TDP 52 SN3 General Belt clip Hand strap Portable hands free BeneWin ...
Страница 15: ...1user_gb fm 1 2 0 OWNER S MANUAL ...
Страница 53: ...27 1 1999 4A0701GB __1 19 Product TDP 52 SN3 Sigma Gold OA0701 Proc The Top Side Layout PA0700 A5 ...
Страница 54: ...27 1 1999 4A0701GB __1 20 Product TDP 52 SN3 Sigma Gold OA0701 Proc The Bottom Side Layout PA0700 A5 ...
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Страница 67: ...27 1 1999 4H0700GB __2 33 Product TDP 52 SN3 Sigma Gold OH0700 The Top Side Layout PH0700 A5 ...
Страница 68: ...27 1 1999 4H0700GB __2 34 Product TDP 52 SN3 Sigma Gold OH0700 The Bottom Side Layout PH0700 A5 ...
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Страница 87: ...26 1 1999 8HAR_GB fm 1 6 0 CHARGING CHARGING ...
Страница 90: ...26 1 1999 8CARA_GB fm 1 7 0 CAR ASSEMBLY KIT CAR ASSEMBLY KIT ...
Страница 98: ...27 1 1999 8udh50gb_fm5 fm 9 Product UDH 50 Carbox OO0700 The Top Side Layout PW0700B2 ...
Страница 99: ...27 1 1999 8udh50gb_fm5 fm 10 Product UDH 50 Carbox OO0700 The Bottom Side Layout PW0700B2 ...
Страница 100: ...27 1 1999 8udh50gb_fm5 fm 11 Product UDH 50 Carbox OO0700 A2 ...
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Страница 131: ...27 1 1999 8HDS50GB_fm5 f 42 Product HDS 50 Ext Handset With Cradle HLS 41 HDS 50 HXS 40 ...
Страница 132: ...27 1 1999 8HDS50GB_fm5 f 43 Product HDS 50 Ext Handset With Cradle 7 4 8 Cradle 7 4 8 1 Mechanics ...
Страница 133: ...27 1 1999 8OSET_GB fm 1 8 0 OFFICE SET OFFICE SET ...
Страница 147: ...27 1 1999 8dds50gb_fm5 fm 15 Product DDS 50 Office set OO0303 ...
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Страница 162: ...27 1 1999 8OTHE_GB fm 1 9 0 OTHER ACCESSORIES OTHER ACCESSORIES ...
Страница 173: ...27 1 1999 Xo0245e4_fm5 fm 12 Product LIF 40 Line Interface OO0245 OO0245 Component Side Layout PO0245A0 ...
Страница 174: ...27 1 1999 Xo0245e4_fm5 fm 13 Product LIF 40 Line Interface OO0245 Solder Side Layout PO0245A0 ...
Страница 175: ...27 1 1999 Xo0245e4_fm5 fm 14 Product LIF 40 Line Interface OO0245 ...
Страница 176: ...27 1 1999 Xo0245e4_fm5 fm 15 Product LIF 40 Line Interface OO0245 ...
Страница 177: ...27 1 1999 Xo0236e4_fm5 fm 16 Product DB 40 Branching Unit YO0236 9 2 BRANCHING UNIT YO0236 ...
Страница 182: ...27 1 1999 Xo0236e4_fm5 fm 21 Product DB 40 Branching Unit OO0241 Solder Side Layout PO0241A3 Schematic OO0241A3 ...
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