JPS573476A - Multiplex demodulation method - Google Patents

Multiplex demodulation method

Info

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
Application number
JP7629980A
Other languages
Japanese (ja)
Inventor
Hiroshi Matsushita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP7629980A priority Critical patent/JPS573476A/en
Publication of JPS573476A publication Critical patent/JPS573476A/en
Pending legal-status Critical Current

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.
JP7629980A 1980-06-06 1980-06-06 Multiplex demodulation method Pending JPS573476A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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