JPS573476A - Multiplex demodulation method - Google Patents
Multiplex demodulation methodInfo
- Publication number
- JPS573476A JPS573476A JP7629980A JP7629980A JPS573476A JP S573476 A JPS573476 A JP S573476A JP 7629980 A JP7629980 A JP 7629980A JP 7629980 A JP7629980 A JP 7629980A JP S573476 A JPS573476 A JP S573476A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- main
- subvoice
- differential amplifier
- voice
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To accomplish the demodulation method of television voice multiplex with a low distortion factor, by obtaining a signal difference through the application of a composite voice multiplex signal and a main voice signal to the input side of a differential amplifier respectively and picking up a subvoice signal through the demodulation of the signal difference using an FM detector. CONSTITUTION:For example, a composite voice multiplex signal Fcomp from an input terminal 1 is an FM+FS signal via a frequency trap 2 except a control signal FQ of 3.5fH and inputted to one of a differential amplifier 3. The main voice signal FM only is picked up and coupled to another input via an LPF4 of 15kHz and also coupled to a main-, subswitching circuit 5. Further, at the output of the differential amplifier 3, a subchannel signal FS as an FM signal eliminated with the amplitude modulating component and the amplitude overlapped component is obtained, and it is picked up as subvoice signal Fs by demodulating it at an FM detector 6. Thus, a subvoice signal with a low distortion factor and less cross talk from the main channel and ease of IC formation is accomplished without using the expensive band pass filter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7629980A JPS573476A (en) | 1980-06-06 | 1980-06-06 | Multiplex demodulation method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7629980A JPS573476A (en) | 1980-06-06 | 1980-06-06 | Multiplex demodulation method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS573476A true JPS573476A (en) | 1982-01-08 |
Family
ID=13601480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7629980A Pending JPS573476A (en) | 1980-06-06 | 1980-06-06 | Multiplex demodulation method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS573476A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62192295A (en) * | 1986-02-19 | 1987-08-22 | デグツサ・アクチエンゲゼルシヤフト | Soft solder alloy for mutual bonding of ceramic part or bonding with part consisting of metal |
-
1980
- 1980-06-06 JP JP7629980A patent/JPS573476A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62192295A (en) * | 1986-02-19 | 1987-08-22 | デグツサ・アクチエンゲゼルシヤフト | Soft solder alloy for mutual bonding of ceramic part or bonding with part consisting of metal |
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