JPS647733A - Multiplex demodulating circuit - Google Patents
Multiplex demodulating circuitInfo
- Publication number
- JPS647733A JPS647733A JP16261187A JP16261187A JPS647733A JP S647733 A JPS647733 A JP S647733A JP 16261187 A JP16261187 A JP 16261187A JP 16261187 A JP16261187 A JP 16261187A JP S647733 A JPS647733 A JP S647733A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- pilot signal
- composite signal
- circuits
- 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.)
- Pending
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 digitally composite signal, delaying one side of both signals to other side, mutually making it into a negative phase, adding it and cancelling a pilot signal component. CONSTITUTION:A composite signal including a pilot signal is inputted to a filter 1, the noise component of the 1/12, 3/12, 5/12 and 6/12 of a sampling frequency fs is removed by adder circuits 11-13 and delaying circuits 14-16, controlled to a signal at a prescribed level with a multiplying circuit 2 and the pilot signal is separated by a BPF 3. The phase of the pilot signal is changed by 180 deg., an adder circuit 6 adds it with a composite signal delayed from a delay circuit 4 and the pilot signal is cancelled. On the other hand, the output of a BPF is inputted to a generating circuit 7 and a rectangular wave and an approximate sine wave are outputted from exclusive OR circuits 75 and 77. These signals are multiplied with the output of the circuit 6 by a multiplying circuit 8, a sub-voice signal is outputted, synthesized with a main voice signal by a matrix circuit 10 and a composite signal is demodulated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16261187A JPS647733A (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16261187A JPS647733A (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647733A true JPS647733A (en) | 1989-01-11 |
Family
ID=15757889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16261187A Pending JPS647733A (en) | 1987-06-30 | 1987-06-30 | Multiplex demodulating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647733A (en) |
-
1987
- 1987-06-30 JP JP16261187A patent/JPS647733A/en active Pending
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