JPS57206143A - Pilot signal detector - Google Patents

Pilot signal detector

Info

Publication number
JPS57206143A
JPS57206143A JP56091182A JP9118281A JPS57206143A JP S57206143 A JPS57206143 A JP S57206143A JP 56091182 A JP56091182 A JP 56091182A JP 9118281 A JP9118281 A JP 9118281A JP S57206143 A JPS57206143 A JP S57206143A
Authority
JP
Japan
Prior art keywords
signal
pilot signal
period
supplied
pulse
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
JP56091182A
Other languages
Japanese (ja)
Other versions
JPS6225303B2 (en
Inventor
Shunichi Nezu
Kenzo Tanabe
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56091182A priority Critical patent/JPS57206143A/en
Publication of JPS57206143A publication Critical patent/JPS57206143A/en
Publication of JPS6225303B2 publication Critical patent/JPS6225303B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/1653—Detection of the presence of stereo signals and pilot signal regeneration

Landscapes

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

Abstract

PURPOSE:To discriminate the presence or absence of a pilot signal in a quick and accurate way, by securing the setting of compromise between the responsiveness and the assuredness in the detection of the pilot signal in accordance with the receiving state. CONSTITUTION:A pulse formation circuit 1 converts a pilot signal into a pulse waveform. A period detecting circuit 2 detects whether or not the period of the input pulse signal is equal to a prescribed one. A duration detecting circuit 3 detects whether the detecting signal supplied to a terminal 6 has continued longer than N period of a pulse signal train which is supplied to a terminal 7. A level detector 10 delivers an N-value selection signal in accordance with the level of the supplied intermediate frequency signal. A selection signal control circuit 11 feeds the specific N value to a terminal group 8 in case a receiver is working for selection of channel and the demodulated signal is not stable and regardless of the output signal of the detector 10. In such constitution, both the responsiveness and the assuredness can be satisfied for the detection of a pilot signal.
JP56091182A 1981-06-12 1981-06-12 Pilot signal detector Granted JPS57206143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56091182A JPS57206143A (en) 1981-06-12 1981-06-12 Pilot signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56091182A JPS57206143A (en) 1981-06-12 1981-06-12 Pilot signal detector

Publications (2)

Publication Number Publication Date
JPS57206143A true JPS57206143A (en) 1982-12-17
JPS6225303B2 JPS6225303B2 (en) 1987-06-02

Family

ID=14019303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56091182A Granted JPS57206143A (en) 1981-06-12 1981-06-12 Pilot signal detector

Country Status (1)

Country Link
JP (1) JPS57206143A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213143A (en) * 1984-04-06 1985-10-25 Clarion Co Ltd Am stereophonic type automatic deciding circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213143A (en) * 1984-04-06 1985-10-25 Clarion Co Ltd Am stereophonic type automatic deciding circuit

Also Published As

Publication number Publication date
JPS6225303B2 (en) 1987-06-02

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