JPS55104152A - Am stereo demodulation circuit - Google Patents

Am stereo demodulation circuit

Info

Publication number
JPS55104152A
JPS55104152A JP1145979A JP1145979A JPS55104152A JP S55104152 A JPS55104152 A JP S55104152A JP 1145979 A JP1145979 A JP 1145979A JP 1145979 A JP1145979 A JP 1145979A JP S55104152 A JPS55104152 A JP S55104152A
Authority
JP
Japan
Prior art keywords
circuit
detection
output
level
signal obtained
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
Application number
JP1145979A
Other languages
Japanese (ja)
Other versions
JPS6217907B2 (en
Inventor
Isao Akitake
Kazuhiko Yamazaki
Tsutomu Noda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1145979A priority Critical patent/JPS55104152A/en
Priority to US06/117,457 priority patent/US4349696A/en
Publication of JPS55104152A publication Critical patent/JPS55104152A/en
Publication of JPS6217907B2 publication Critical patent/JPS6217907B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
    • H04H20/49—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for AM stereophonic broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To prevent the deterioration of degree of separation, by controlling the gain and amplitude of FM and PM detection circuit at the output level of AM detection and avoiding the level difference between the sum signal obtained at the AM detection and the difference signal obtained at the FM and PM detection. CONSTITUTION:The output of the AM detection circuit 12 is inputted to the matrix circuit 16 and also to the rectifying circuit 19, where the DC voltage according to the level of the said detection output level is produced. The output of the rectifying circuit 19 is fed back to the high frequency amplifying circuit 10 and intermediate frequency amplifying circuit 11, and if the input signal level is increased, the gain control circuit keeping the output at almost constant value is formed. Further, the output of the rectifying circuit 19 is connected to the control terminal 48 of the amplitude limit circuit 13 to control the gain and amplitude of the amplitude limit circuit 13 in proportion to the antenna input level. Thus, the difference between the sum signal obtained at the AM detection circuit 12 and the difference signal obtained at the FM detection circuit 14 can be eliminated to prevent the deterioration of degree of separation.
JP1145979A 1979-02-05 1979-02-05 Am stereo demodulation circuit Granted JPS55104152A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1145979A JPS55104152A (en) 1979-02-05 1979-02-05 Am stereo demodulation circuit
US06/117,457 US4349696A (en) 1979-02-05 1980-02-01 AM Stereophonic demodulator circuit for amplitude/angle modulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1145979A JPS55104152A (en) 1979-02-05 1979-02-05 Am stereo demodulation circuit

Publications (2)

Publication Number Publication Date
JPS55104152A true JPS55104152A (en) 1980-08-09
JPS6217907B2 JPS6217907B2 (en) 1987-04-20

Family

ID=11778673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1145979A Granted JPS55104152A (en) 1979-02-05 1979-02-05 Am stereo demodulation circuit

Country Status (1)

Country Link
JP (1) JPS55104152A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711853U (en) * 1980-06-20 1982-01-21
JPS5737947A (en) * 1980-08-15 1982-03-02 Hitachi Ltd Am stereo receiver
JPS5767344A (en) * 1980-10-15 1982-04-23 Sharp Corp Am stereo receiver
JPS5797744A (en) * 1980-12-10 1982-06-17 Matsushita Electric Ind Co Ltd Am stereo receiver
JPS57206144A (en) * 1981-06-12 1982-12-17 Matsushita Electric Ind Co Ltd Am stereo broadcasting system and its signal receiver
JPS6478044A (en) * 1987-09-18 1989-03-23 Sanyo Electric Co Television voice multiplex demodulation circuit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711853U (en) * 1980-06-20 1982-01-21
JPS6221090Y2 (en) * 1980-06-20 1987-05-28
JPS5737947A (en) * 1980-08-15 1982-03-02 Hitachi Ltd Am stereo receiver
JPS6317259B2 (en) * 1980-08-15 1988-04-13 Hitachi Ltd
JPS5767344A (en) * 1980-10-15 1982-04-23 Sharp Corp Am stereo receiver
JPS5797744A (en) * 1980-12-10 1982-06-17 Matsushita Electric Ind Co Ltd Am stereo receiver
JPS57206144A (en) * 1981-06-12 1982-12-17 Matsushita Electric Ind Co Ltd Am stereo broadcasting system and its signal receiver
JPS6315778B2 (en) * 1981-06-12 1988-04-06 Matsushita Electric Ind Co Ltd
JPS6478044A (en) * 1987-09-18 1989-03-23 Sanyo Electric Co Television voice multiplex demodulation circuit
JP2735832B2 (en) * 1987-09-18 1998-04-02 三洋電機株式会社 Television sound multiplex demodulation circuit

Also Published As

Publication number Publication date
JPS6217907B2 (en) 1987-04-20

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