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JPS572135A - Radio telephone system - Google Patents

Radio telephone system

Info

Publication number
JPS572135A
JPS572135A JP7592280A JP7592280A JPS572135A JP S572135 A JPS572135 A JP S572135A JP 7592280 A JP7592280 A JP 7592280A JP 7592280 A JP7592280 A JP 7592280A JP S572135 A JPS572135 A JP S572135A
Authority
JP
Japan
Prior art keywords
frequency
signal
oscillator
filter
amplifier
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
JP7592280A
Other languages
Japanese (ja)
Inventor
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 JP7592280A priority Critical patent/JPS572135A/en
Publication of JPS572135A publication Critical patent/JPS572135A/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
    • H04B1/62—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 for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Landscapes

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

Abstract

PURPOSE:To carry out accurate fine tuning, by giving phase comparison at the receiver side between the extracted pilot signal and the frequency of a reference oscillator to feed them back to a local oscillator and securing automatic tuning between the local oscillation frequency and the transmitting frequency. CONSTITUTION:At the transmitting part, both the voice channel and the control channel are synthesized 10 in a voice region and then converted into an IF band by a balanced modulator 11 and a carrier oscillator 12. This IF band is converted into a high-frequency band by a mixer 15 and a locak oscillator 16 and via an IF filter 13 and an IF amplifier 14 and then transmitted into a space through a high- frequency filter 17 and a high-frequncy amplifier 18. On the other hand, the received signals are mixed 20 together after a high-frequency amplification 19 at the receiving part and then converted into an IF in terms of the frequency to be transmitted to a demodulator 24 via a crystal filter 22 and an IF amplifier 23. Then the lincompex signal is demodulated by the signal supplied from a carrier oscillator 25 and the IF signal to be separated through a branching filter 26 and a BPF27 into a voice channel signal and a control channel signal.
JP7592280A 1980-06-04 1980-06-04 Radio telephone system Pending JPS572135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7592280A JPS572135A (en) 1980-06-04 1980-06-04 Radio telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7592280A JPS572135A (en) 1980-06-04 1980-06-04 Radio telephone system

Publications (1)

Publication Number Publication Date
JPS572135A true JPS572135A (en) 1982-01-07

Family

ID=13590277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7592280A Pending JPS572135A (en) 1980-06-04 1980-06-04 Radio telephone system

Country Status (1)

Country Link
JP (1) JPS572135A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0329529A (en) * 1989-06-09 1991-02-07 Amaf Ind Inc Frequency calibration method and equipment in lincompex equipment
US6178765B1 (en) 1998-05-13 2001-01-30 Funai Electric Co., Ltd. Air conditioner having air cleaning function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424516A (en) * 1977-07-26 1979-02-23 Mitsubishi Electric Corp Ssb receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424516A (en) * 1977-07-26 1979-02-23 Mitsubishi Electric Corp Ssb receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0329529A (en) * 1989-06-09 1991-02-07 Amaf Ind Inc Frequency calibration method and equipment in lincompex equipment
US6178765B1 (en) 1998-05-13 2001-01-30 Funai Electric Co., Ltd. Air conditioner having air cleaning function

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