參數(shù)資料
型號(hào)： UPC1851BCU
廠商： NEC Corp.
英文描述： I2C BUS-COMPATIBLE US MTS PROCESSING LSI
中文描述： I2C總線兼容美國的多邊貿(mào)易體制處理LSI
文件頁數(shù)： 39/60頁
文件大小： 447K
代理商： UPC1851BCU
39
μ
PC1851B
Data Sheet S13417EJ2V0DS00
(3) Stereo, SAP broadcast reception (reception status) detection
Whether SAP or stereo broadcast is being received and the
μ
PC1851B outputs the audio signal can be detected
with bits D2 and D3 of the read register. The register data become “1” only if the SAP signal (5 f
H
) is detected when
the SAP broadcast reception is selected, or if the stereo pilot signal is detected when the stereo broadcast reception
is selected.
Figure 4-12. Stereo, SAP Broadcast Reception (Reception Status) Detection
(4) Noise detection
Noise can be detected with bit D4 of the read register. It is monitored in the vicinity of the 11.5 f
H
(180 kHz) signal
level.
During noise detection, the operation of the SAP demodulator block and the stereo demodulation block is interrupted
(Refer to section
4.3 (1) Stereo/SAP output stop function during noise detection
).
Figure 4-13. Noise Detection
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
1
1
Broadcast status
Stereo
broadcast
SAP
broadcast
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
0
1
Noise detection
Noise
No noise
0
1
0
1
Stereo broadcast reception
Outputing SAP broadcast
No outputing SAP broadcast
SAP broadcast reception
No outputing stereo broadcast
Outputing stereo broadcast
D7
D6
D5
D4
D3
D2
D1
D0
Power-on
reset
Noise
detection
1
1
Broadcast status
Stereo
broadcast
SAP
broadcast
Stereo
broadcast
reception
SAP
broadcast
reception
Reception status
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