JPS57131181A - Automatic switching device of antenna - Google Patents

Automatic switching device of antenna

Info

Publication number
JPS57131181A
JPS57131181A JP1666881A JP1666881A JPS57131181A JP S57131181 A JPS57131181 A JP S57131181A JP 1666881 A JP1666881 A JP 1666881A JP 1666881 A JP1666881 A JP 1666881A JP S57131181 A JPS57131181 A JP S57131181A
Authority
JP
Japan
Prior art keywords
level
signal
circuit
antenna
comparing
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
JP1666881A
Other languages
Japanese (ja)
Inventor
Michiro Ikenishi
Yumio Kawai
Noriyuki Kawamoto
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 JP1666881A priority Critical patent/JPS57131181A/en
Publication of JPS57131181A publication Critical patent/JPS57131181A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To automatically switch a receiving antenna, by providing a switch ing circuit for switching a video signal from the antenna, a sample holding circuit for sampling a pedestal level, and a comparing circuit for comparing a signal level. CONSTITUTION:A high frequency video signal received by an antenna is inputted to a television receiver 42 through a high frequency switch 37, samples a pedestal level of a video signal 43 by a level sampling circuit 44, and after that, is converted to DC voltage by a peak holding circuit 51. The highest level signal and other signal by a level comparing circuit 58 are outputted as an on-signal and an off-signal, respectively, are held until the next level comparing time, a driving signal of the high frequency switch 37 in case of sampling a level, and an output signal for comparing a level are synthesized by a controlling circuit 63, become driving signals 38, 39 and 40, and the high frequency switch 37 is controlled. In this way, the antenna is switched by a simple constitution.
JP1666881A 1981-02-05 1981-02-05 Automatic switching device of antenna Pending JPS57131181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1666881A JPS57131181A (en) 1981-02-05 1981-02-05 Automatic switching device of antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1666881A JPS57131181A (en) 1981-02-05 1981-02-05 Automatic switching device of antenna

Publications (1)

Publication Number Publication Date
JPS57131181A true JPS57131181A (en) 1982-08-13

Family

ID=11922694

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1666881A Pending JPS57131181A (en) 1981-02-05 1981-02-05 Automatic switching device of antenna

Country Status (1)

Country Link
JP (1) JPS57131181A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61284105A (en) * 1985-06-11 1986-12-15 Clarion Co Ltd Television antenna changeover device
DE4006295A1 (en) * 1989-02-28 1990-08-30 Krauss Maffei Ag Diversity antenna system for mobile television signal reception - has switching between alternate antenna devices dependent on signal reception level

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5610780A (en) * 1979-07-06 1981-02-03 Matsushita Electric Ind Co Ltd Television receiving antenna unit for traveling-body mounting

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5610780A (en) * 1979-07-06 1981-02-03 Matsushita Electric Ind Co Ltd Television receiving antenna unit for traveling-body mounting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61284105A (en) * 1985-06-11 1986-12-15 Clarion Co Ltd Television antenna changeover device
JPH0542873B2 (en) * 1985-06-11 1993-06-29 Clarion Co Ltd
DE4006295A1 (en) * 1989-02-28 1990-08-30 Krauss Maffei Ag Diversity antenna system for mobile television signal reception - has switching between alternate antenna devices dependent on signal reception level

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