參數(shù)資料
型號(hào)： CXA1518S
廠商： Sony Corporation
英文描述： EIAJ TV Sound Multiplexing Decoder(EIAJ接口的電視聲音多路解碼器)
中文描述： EIAJ電視聲音多路復(fù)用解碼器（EIAJ接口的電視聲音多路解碼器）
文件頁(yè)數(shù)： 14/20頁(yè)
文件大小： 260K
代理商： CXA1518S
Broadcast
status
Stereo
Bilingual
Monaural
Control Voltage Range
Pin numbers in brackets are for the CXA1518Q.
—14—
CXA1518Q/S
Output and LED ON/OFF Table
MODE SW
SUB
BOTH MAIN
×
×
×
×
×
×
×
×
×
on
on
on
×
×
×
×
×
×
×
×
×
Forced
monaural
off
on
×
off
off
off
on
×
×
×
MUTE
off
off
on
off
off
off
off
on
off
on
Output status
L
R
MAIN
L
R
L+R
L+R
DC
MAIN
MAIN
MAIN
MAIN
DC
L+R
DC
SUB
MAIN
MAIN
MAIN
DC
MONO MONO MONO
DC
DC
L+R
DC
SUB
SUB
MAIN
MAIN
DC
DC
LED ON/OFF conditions
STEREO
SUB
MAIN
on
off
off
off
off
off
off
off
off
off
off
off
off
on
on
off
off
off
off
off
off
off
off
off
on
on
off
off
off
off
MODE SW
Pin 12
(Pin 14)
FORCED
MONO
Pin 14
(Pin 16)
MUTE
Pin 13
(Pin 15)
SUB
BOTH
MAIN
on
off
on
off
Voltage range
4.0 V to V
CC
2 V to 3 V
0 V to 0.5 V
3 V to V
CC
0 V to 0.5 V (or OPEN)
3 V to V
CC
0 V to 0.5 V (or OPEN)
×
: No response
Description of Operation
The sound multiplexing signal input from Pin 6 (Pin 3) passes through IN AMP, and is added to the Cue BPF,
SUB BPF and the MAIN de-emphasis circuits.
Pin numbers in brackets are for the CXA1518Q.
1
Discrimination system
The Cue BPF passes only the Cue signal component of the multiplexing signal. The AM demodulator
detects the amplitude modulation of the Cue signal (AM wave) and generates a sine wave of either 922.5
Hz (for bilingual) or 982.5 Hz (for stereo sound).
COMP shapes the carrier-stripped Cue signal into a waveform, transforming it into pulses of either 922.5
Hz or 982.5 Hz, after which it is added to the LOGIC unit.
A 3.5f
H
VCO generates a 3.5f
H
pulse locked to the Cue signal carrier wave (3.5f
H
), and sends it to the
LOGIC unit.
The LOGIC unit performs broadcast mode discrimination using the countdown method. From this result,
and the existence/absence of a SUB signal from the SUB Detector, MUTE ON/OFF from CONT, MODE
Switch, and the FOMO ON/OFF commands, the logic unit generates an output switchover control signal to
control the output statuses of OUTPUT SW and MAIN OUT.
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