JPS5744350A - Stereophonic signal generator - Google Patents

Stereophonic signal generator

Info

Publication number
JPS5744350A
JPS5744350A JP11944780A JP11944780A JPS5744350A JP S5744350 A JPS5744350 A JP S5744350A JP 11944780 A JP11944780 A JP 11944780A JP 11944780 A JP11944780 A JP 11944780A JP S5744350 A JPS5744350 A JP S5744350A
Authority
JP
Japan
Prior art keywords
stereophonic
signal
frequency divider
switch circuit
pilot signal
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
JP11944780A
Other languages
Japanese (ja)
Inventor
Akira Ito
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11944780A priority Critical patent/JPS5744350A/en
Publication of JPS5744350A publication Critical patent/JPS5744350A/en
Pending 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
    • H04H20/48—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 FM stereophonic broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals

Landscapes

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

Abstract

PURPOSE:To improve the separation of the right and left channels of an FM stereophonic broadcast by maintaining a correct phase relation between a pilot signal and the carrier of a stereophonic subchannel which are contained in a stereophonic composite signal. CONSTITUTION:The output of a 76kHz oscillator 1 is converted into a 38kHz driving signal through the frequency division of a frequency divider 2 and a switch circuit 3 is driven to convert a left and a right audio signal into a stereophonic composite signal. From part of the output of the frequency divider 2, a switch circuit 3' having a delay time equal to the switch circuit 3 removes a difference in delay time between the stereophonic composite signal and a pilot signal. The output of the switch circuit 3' is converted into a pilot signal, having a correct phase relation, by an automatic phase controlling circuit consisting of a frequency divider 4, a phase comparator 8, a voltage-controlled oscillator 5, a frequency divider 6, and a low-pass filter 7 and the pilot signal is superposed upon the stereophonic composite signal by a synthesizing circuit 9.
JP11944780A 1980-08-29 1980-08-29 Stereophonic signal generator Pending JPS5744350A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11944780A JPS5744350A (en) 1980-08-29 1980-08-29 Stereophonic signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11944780A JPS5744350A (en) 1980-08-29 1980-08-29 Stereophonic signal generator

Publications (1)

Publication Number Publication Date
JPS5744350A true JPS5744350A (en) 1982-03-12

Family

ID=14761618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11944780A Pending JPS5744350A (en) 1980-08-29 1980-08-29 Stereophonic signal generator

Country Status (1)

Country Link
JP (1) JPS5744350A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007040095A1 (en) * 2005-09-30 2007-04-12 Thine Electronics, Inc. Stereo modulator and fm stereo modulator using the same
US7936228B2 (en) 2005-12-06 2011-05-03 Rohm Co., Ltd. Frequency modulator and FM transmission circuit using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007040095A1 (en) * 2005-09-30 2007-04-12 Thine Electronics, Inc. Stereo modulator and fm stereo modulator using the same
US7936228B2 (en) 2005-12-06 2011-05-03 Rohm Co., Ltd. Frequency modulator and FM transmission circuit using the same

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