JPS6437139A - Stereo demodulating circuit - Google Patents

Stereo demodulating circuit

Info

Publication number
JPS6437139A
JPS6437139A JP62193182A JP19318287A JPS6437139A JP S6437139 A JPS6437139 A JP S6437139A JP 62193182 A JP62193182 A JP 62193182A JP 19318287 A JP19318287 A JP 19318287A JP S6437139 A JPS6437139 A JP S6437139A
Authority
JP
Japan
Prior art keywords
subcarrier
switching signal
frequency
frequency dividing
phase
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
JP62193182A
Other languages
Japanese (ja)
Inventor
Hiroaki Tochihara
Koji Yoshifusa
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP62193182A priority Critical patent/JPS6437139A/en
Publication of JPS6437139A publication Critical patent/JPS6437139A/en
Pending legal-status Critical Current

Links

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To obtain a stable switching signal throughout a wide temperature range by generating the switching signal synchronized with a subcarrier by a PLL circuit in the polar system. CONSTITUTION:In a frequency dividing means 13 of a PLL circuit 14, the output of a voltage controlled oscillator 4 which generates four fold subcarrier frequency is divided in a first frequency dividing circuit 5 by 1/2 and is divided in a second frequency dividing circuit 6 by 1/4. A phase shifter 7 generates a first switching signal whose frequency and phase coincide with those of the subcarrier and a second switching signal which has the same frequency as the subcarrier and has a phase dif ferent from the subcarrier by 180 deg. on the basis of outputs of frequency dividing circuits 5 and 6. Since analog switches 8 and 9 receive first and second switching signals and are turned on/off, they are accurately turned on/off in positive/negative half cycles of the subcarrier.
JP62193182A 1987-07-31 1987-07-31 Stereo demodulating circuit Pending JPS6437139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62193182A JPS6437139A (en) 1987-07-31 1987-07-31 Stereo demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62193182A JPS6437139A (en) 1987-07-31 1987-07-31 Stereo demodulating circuit

Publications (1)

Publication Number Publication Date
JPS6437139A true JPS6437139A (en) 1989-02-07

Family

ID=16303669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62193182A Pending JPS6437139A (en) 1987-07-31 1987-07-31 Stereo demodulating circuit

Country Status (1)

Country Link
JP (1) JPS6437139A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8594234B2 (en) 2007-08-10 2013-11-26 Koninklijke Philips N.V. Multiple transmission apparatus with reduced coupling
JP2015002405A (en) * 2013-06-14 2015-01-05 スパンション エルエルシー Noise detection circuit and reception circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4846201A (en) * 1971-10-13 1973-07-02
JPS4962003A (en) * 1972-09-13 1974-06-15

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4846201A (en) * 1971-10-13 1973-07-02
JPS4962003A (en) * 1972-09-13 1974-06-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8594234B2 (en) 2007-08-10 2013-11-26 Koninklijke Philips N.V. Multiple transmission apparatus with reduced coupling
JP2015002405A (en) * 2013-06-14 2015-01-05 スパンション エルエルシー Noise detection circuit and reception circuit

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