JPS55156430A - Radio telephone system - Google Patents

Radio telephone system

Info

Publication number
JPS55156430A
JPS55156430A JP6443379A JP6443379A JPS55156430A JP S55156430 A JPS55156430 A JP S55156430A JP 6443379 A JP6443379 A JP 6443379A JP 6443379 A JP6443379 A JP 6443379A JP S55156430 A JPS55156430 A JP S55156430A
Authority
JP
Japan
Prior art keywords
circuit
amplitude
output
frequency
subcarrier
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
JP6443379A
Other languages
Japanese (ja)
Inventor
Masahiro Watanabe
Hiroshi Haruki
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 JP6443379A priority Critical patent/JPS55156430A/en
Publication of JPS55156430A publication Critical patent/JPS55156430A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/08—Transmission systems not characterised by the medium used for transmission characterised by the use of a sub-carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To expand the allowable range of a difference between transmission and reception frequencies and also to make automatic frequency control possible by amplitude-modulating the 1st subcarrier by the amplitude level of an audio signal and by frequency-modulating the 2nd subcarrier by the amplitude-modulated signal. CONSTITUTION:An audio signal is applied to rectifying circuit 1 to output amplitude information, which allows amplitude-modulating circuit 4 to amplitude- modulate a signal of the 1st subcarrier frequency fs1 and the output of circuit 4 is converted by frequency converting circuit 5 into the 2nd subcarrier frequency fs2. The audio signal is also supplied to compressing circuit 2, which compresses it according to the output of rectifying circuit 1 of circuit 2 to output frequency information and it is supplied to a radio transmission part being mixed with the output of frequency converting circuit 5. In a receiver, a frequency information component and amplitude information component are extracted from a SSB detection output and an amplitude-modulated signal, the output of FM detecting circuit 12, is detected by AM detecting circuit 13 to obtain amplitude information, so that expanding circuit 17 will reproduce the original audio signal.
JP6443379A 1979-05-24 1979-05-24 Radio telephone system Pending JPS55156430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6443379A JPS55156430A (en) 1979-05-24 1979-05-24 Radio telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6443379A JPS55156430A (en) 1979-05-24 1979-05-24 Radio telephone system

Publications (1)

Publication Number Publication Date
JPS55156430A true JPS55156430A (en) 1980-12-05

Family

ID=13258129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6443379A Pending JPS55156430A (en) 1979-05-24 1979-05-24 Radio telephone system

Country Status (1)

Country Link
JP (1) JPS55156430A (en)

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