JPS5735439A - Am stereo reproducing circuit - Google Patents

Am stereo reproducing circuit

Info

Publication number
JPS5735439A
JPS5735439A JP11022780A JP11022780A JPS5735439A JP S5735439 A JPS5735439 A JP S5735439A JP 11022780 A JP11022780 A JP 11022780A JP 11022780 A JP11022780 A JP 11022780A JP S5735439 A JPS5735439 A JP S5735439A
Authority
JP
Japan
Prior art keywords
signal
circuit
inputted
intermediate frequency
detected
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
JP11022780A
Other languages
Japanese (ja)
Other versions
JPS6234304B2 (en
Inventor
Kazuo Watanabe
Masanori Ienaka
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 JP11022780A priority Critical patent/JPS5735439A/en
Publication of JPS5735439A publication Critical patent/JPS5735439A/en
Publication of JPS6234304B2 publication Critical patent/JPS6234304B2/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
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems

Landscapes

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

Abstract

PURPOSE:To make an HPF unnecessary, to simplify the circuit constitution and to reduce the cost, by adding a canceling function for a pilot signal to a variable gain circuit making level adjustment of a differential signal component. CONSTITUTION:An AM broadcast signal is inputted to an RF amplifying stage 1. The RM amplification outout signal and a local oscillation signal formed at a local oscillation circuit 3 are mixed in a frequency mixing circuit 2 and inputted to an intermediate frequency amplifying stage 4 through frequency conversion. This intermediate frequency amplification output signal is detected at an AM detector 5 for a sum signal L+R. This detected output is inputted to a matrix circuit 13 forming a stereo reproducing signal and an AGC filter 6 to obtain an AGC voltage. This AGC voltage is used for the gain control of the RF amplifying stage 1, intermediate frequency amplification state 4, and variable gain circuit 9. The intermediate frequency amplifying signal is inputted to a PM detector 8 through a limiter amplifier 7 to form a differential signal L-R and a pilot signal P. The presence of the pilot signal detected at an LPF11 makes desired displays via a lamp driver 12.
JP11022780A 1980-08-13 1980-08-13 Am stereo reproducing circuit Granted JPS5735439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11022780A JPS5735439A (en) 1980-08-13 1980-08-13 Am stereo reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11022780A JPS5735439A (en) 1980-08-13 1980-08-13 Am stereo reproducing circuit

Publications (2)

Publication Number Publication Date
JPS5735439A true JPS5735439A (en) 1982-02-26
JPS6234304B2 JPS6234304B2 (en) 1987-07-25

Family

ID=14530307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11022780A Granted JPS5735439A (en) 1980-08-13 1980-08-13 Am stereo reproducing circuit

Country Status (1)

Country Link
JP (1) JPS5735439A (en)

Also Published As

Publication number Publication date
JPS6234304B2 (en) 1987-07-25

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