JPS647734A - Multiplex demodulating circuit - Google Patents
Multiplex demodulating circuitInfo
- Publication number
- JPS647734A JPS647734A JP16261287A JP16261287A JPS647734A JP S647734 A JPS647734 A JP S647734A JP 16261287 A JP16261287 A JP 16261287A JP 16261287 A JP16261287 A JP 16261287A JP S647734 A JPS647734 A JP S647734A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- pilot
- composite
- pilot signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Stereo-Broadcasting Methods (AREA)
Abstract
PURPOSE:To digitally demodulate a composite signal with a simple constitution by separating a pilot signal from a composite signal to remove approximately the same frequency component as the higher harmonics of an approximate sine wave and demodulating a sub-voice signal based on it. CONSTITUTION:For a composite signal including a pilot signal, the pilot signal is separated through a filter 1 and a BPF 3. An opposite phase pilot signal and a signal to delay 4 the output signal of the filter 1 are added 6 and the pilot signal is removed. On the other hand, the pilot signal is converted into the digital signal of one bit with a detecting circuit 71 of a generating circuit 7, and the signal delayed with a delaying circuit 72 and the output signal of the circuit 71 go to rectangular waves through an exclusive (OR) circuit 75. The signal is delayed only by 1/8 and 1/4 periods with delaying circuits 73 and 74 and both signals pass through an EOR 76, an inverter 78 and an EOR 77, and an approximate sine wave signal is outputted. The output signal of circuits 75, 76 and 6 are multiplied by a multiplying circuit 8, a sub-voice signal is outputted, synthesized with a main voice signal by a matrix circuit 10 and the composite signal is demodulated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16261287A JP2628999B2 (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16261287A JP2628999B2 (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS647734A true JPS647734A (en) | 1989-01-11 |
JP2628999B2 JP2628999B2 (en) | 1997-07-09 |
Family
ID=15757907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16261287A Expired - Lifetime JP2628999B2 (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2628999B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1148632A2 (en) * | 2000-03-31 | 2001-10-24 | Pioneer Corporation | FM stereo signal demodulating apparatus |
-
1987
- 1987-06-30 JP JP16261287A patent/JP2628999B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1148632A2 (en) * | 2000-03-31 | 2001-10-24 | Pioneer Corporation | FM stereo signal demodulating apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2628999B2 (en) | 1997-07-09 |
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