JPS57129540A - Automatic antenna switching device - Google Patents

Automatic antenna switching device

Info

Publication number
JPS57129540A
JPS57129540A JP1616481A JP1616481A JPS57129540A JP S57129540 A JPS57129540 A JP S57129540A JP 1616481 A JP1616481 A JP 1616481A JP 1616481 A JP1616481 A JP 1616481A JP S57129540 A JPS57129540 A JP S57129540A
Authority
JP
Japan
Prior art keywords
high frequency
signal
input
input signals
switched
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
JP1616481A
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 JP1616481A priority Critical patent/JPS57129540A/en
Publication of JPS57129540A publication Critical patent/JPS57129540A/en
Pending 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
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To reduce the aural distortion noise which is caused when the input signal is switched, by connecting a resistance element between the input and the output of a high frequency switch circuit. CONSTITUTION:Resistance elements 39-41 are connected between the inputs and outputs of semiconductor switches 36-38 of a high frequency switch circuit 4', and a part of high frequency input signals 1-3 is always delivered via the elements 39-41. When the signals 1-3 are switched, no fall of the output signal is caused although a large level difference exists between the input signals since a part of the input signals is always delivered. And the difference of level is small even with an aural intermediate frequency signal, and accordingly, the distortion of a demodulated signal is extremely reduced.
JP1616481A 1981-02-04 1981-02-04 Automatic antenna switching device Pending JPS57129540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1616481A JPS57129540A (en) 1981-02-04 1981-02-04 Automatic antenna switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1616481A JPS57129540A (en) 1981-02-04 1981-02-04 Automatic antenna switching device

Publications (1)

Publication Number Publication Date
JPS57129540A true JPS57129540A (en) 1982-08-11

Family

ID=11908862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1616481A Pending JPS57129540A (en) 1981-02-04 1981-02-04 Automatic antenna switching device

Country Status (1)

Country Link
JP (1) JPS57129540A (en)

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