JPS5714224A - Comparing device for antenna reception level - Google Patents

Comparing device for antenna reception level

Info

Publication number
JPS5714224A
JPS5714224A JP8975780A JP8975780A JPS5714224A JP S5714224 A JPS5714224 A JP S5714224A JP 8975780 A JP8975780 A JP 8975780A JP 8975780 A JP8975780 A JP 8975780A JP S5714224 A JPS5714224 A JP S5714224A
Authority
JP
Japan
Prior art keywords
signals
signal
level
frequency
circuit
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
JP8975780A
Other languages
Japanese (ja)
Inventor
Michiro Ikenishi
Yumio Kawai
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 JP8975780A priority Critical patent/JPS5714224A/en
Publication of JPS5714224A publication Critical patent/JPS5714224A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Radio Transmission System (AREA)

Abstract

PURPOSE:To make a level comparison in a short time by switching high-frequency signals from antennas at periods a little bit longer than that of a horizontal synchronizing equivalent pulse signal, and by generating switching driving signals, containing on- and off-signals, by comparing those signals. CONSTITUTION:A high-frequency switch 4 switches television high-frequency signals 1, 2 and 3 by high-frequency switch driving signals 5, 6 and 7 at periods a little bit longer than that of a horizontal synchronizing equivalent pulse signal. A high-frequency signal 8 passes through a television receiver 9 and supplied to a peak holding circuit 11, which outputs a horizontal synchronizing equivalent pulse peak-value signal 12. Then, DC sampled level signals 17, 18 and 19 sampled by a switch circuit 13 are converted by a peak holding circuit 20 into DC voltage signals 24, 25 and 26, which is compared by a level comparing circuit 27 with a timing pulse 28, thereby outputting level comparison signals 31, 32 and 33 which are each regarded as an on-signal when at a high level or as an off-signal when at a low level. Then, they are synthesized by a control circuit 30 to obtain driving signals 5, 6 and 7 accompanied by the ON and OFF signals.
JP8975780A 1980-06-30 1980-06-30 Comparing device for antenna reception level Pending JPS5714224A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8975780A JPS5714224A (en) 1980-06-30 1980-06-30 Comparing device for antenna reception level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8975780A JPS5714224A (en) 1980-06-30 1980-06-30 Comparing device for antenna reception level

Publications (1)

Publication Number Publication Date
JPS5714224A true JPS5714224A (en) 1982-01-25

Family

ID=13979590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8975780A Pending JPS5714224A (en) 1980-06-30 1980-06-30 Comparing device for antenna reception level

Country Status (1)

Country Link
JP (1) JPS5714224A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499606A (en) * 1982-12-27 1985-02-12 Sri International Reception enhancement in mobile FM broadcast receivers and the like
US4566133A (en) * 1982-12-27 1986-01-21 Commtech International Switched diversity method and apparatus for FM receivers
US5303396A (en) * 1990-06-13 1994-04-12 Hitachi, Ltd. Diversity reception having a plurality of antennas for use with moving vehicles
US5410748A (en) * 1991-06-04 1995-04-25 Sony Corporation Space diversity receivers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499606A (en) * 1982-12-27 1985-02-12 Sri International Reception enhancement in mobile FM broadcast receivers and the like
US4566133A (en) * 1982-12-27 1986-01-21 Commtech International Switched diversity method and apparatus for FM receivers
US5303396A (en) * 1990-06-13 1994-04-12 Hitachi, Ltd. Diversity reception having a plurality of antennas for use with moving vehicles
US5410748A (en) * 1991-06-04 1995-04-25 Sony Corporation Space diversity receivers

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