JPS5735485A - Frequency identifier - Google Patents

Frequency identifier

Info

Publication number
JPS5735485A
JPS5735485A JP11052180A JP11052180A JPS5735485A JP S5735485 A JPS5735485 A JP S5735485A JP 11052180 A JP11052180 A JP 11052180A JP 11052180 A JP11052180 A JP 11052180A JP S5735485 A JPS5735485 A JP S5735485A
Authority
JP
Japan
Prior art keywords
signal
low pass
frequency
pass filter
output
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
JP11052180A
Other languages
Japanese (ja)
Inventor
Yasunori Sakaguchi
Nobuharu Yazawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11052180A priority Critical patent/JPS5735485A/en
Priority to DE3131892A priority patent/DE3131892C2/en
Priority to US06/292,273 priority patent/US4438405A/en
Publication of JPS5735485A publication Critical patent/JPS5735485A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To enable to identify a stereo broadcast and a duplex audio signal only with an electronic circuit, by processing an output mixing a signal dividing the carrier of a control signal with an original AM signal by a low pass filter and a phase comparator. CONSTITUTION:A composite signal input is given to a selection amplifier 1 and only the AM signal in a given frequency being the identification signal is amplified. This amplified signal is branched into two: one is inputted to a frequency mixer 7, as it is and another is inputted to the frequency mixer 7 via a limiter 5 and a frequency-divider 6. The output of the mixer 7 is applied to the 1st low pass filter 8 to pick up the component difference between the signal frequency-divided with the 1st low pass filter 8 and the AM signal. After giving the output to the 2nd low pass filter 9, the phase of both the low pass filters 8, 9 is compared at a phase comparator 10. Thus, identification is made between stereo and duplex audio broadcast through the output state of the phase comparator 10.
JP11052180A 1980-08-12 1980-08-12 Frequency identifier Pending JPS5735485A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP11052180A JPS5735485A (en) 1980-08-12 1980-08-12 Frequency identifier
DE3131892A DE3131892C2 (en) 1980-08-12 1981-08-12 Frequency separator
US06/292,273 US4438405A (en) 1980-08-12 1981-08-12 Frequency discriminating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11052180A JPS5735485A (en) 1980-08-12 1980-08-12 Frequency identifier

Publications (1)

Publication Number Publication Date
JPS5735485A true JPS5735485A (en) 1982-02-26

Family

ID=14537898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11052180A Pending JPS5735485A (en) 1980-08-12 1980-08-12 Frequency identifier

Country Status (1)

Country Link
JP (1) JPS5735485A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54162924A (en) * 1978-06-14 1979-12-25 Murata Manufacturing Co Filter and signal discriminator using same
JPS5510211A (en) * 1978-07-07 1980-01-24 Victor Co Of Japan Ltd Signal discrimination circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54162924A (en) * 1978-06-14 1979-12-25 Murata Manufacturing Co Filter and signal discriminator using same
JPS5510211A (en) * 1978-07-07 1980-01-24 Victor Co Of Japan Ltd Signal discrimination circuit

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