JPS55128928A - Radio communication system - Google Patents

Radio communication system

Info

Publication number
JPS55128928A
JPS55128928A JP3637179A JP3637179A JPS55128928A JP S55128928 A JPS55128928 A JP S55128928A JP 3637179 A JP3637179 A JP 3637179A JP 3637179 A JP3637179 A JP 3637179A JP S55128928 A JPS55128928 A JP S55128928A
Authority
JP
Japan
Prior art keywords
amplitude
output
variation component
transmitted
transmission
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
JP3637179A
Other languages
Japanese (ja)
Inventor
Toru Fujisawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3637179A priority Critical patent/JPS55128928A/en
Publication of JPS55128928A publication Critical patent/JPS55128928A/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
    • H04B1/68—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 wholly or partially suppressing the carrier or one side band

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 improve greatly the transmission quality of the communication system by securing the restoration through the differential transmission of both the frequency variation component of the aural signal to be transmitted and the amplitude fluctuation component of the amplitude variation component each. CONSTITUTION:Voice 1 converted into the electric signal via microphone 2 and then amplified 3. Then balanced modulation 4 is given to the output of local oscillator 5, and the single side band amplitude modulation wave is extracted through BPF6 for SSB. And the frequency variation component of the fixed amplitude is secured via limiter amplifier 7 for V (frequency variation component of fixed amplitude) to be then extracted through BPF8 for V. On the other hand, the amplitude variation component is detected out of the output of BPF6 and through detector 9, and then the output of oscillator 5 receives the amplitude modulation via pilot modulator 10 to be transmitted to transmtter 15 through BPF13 for PL (pilot). At the same time, the output of BPF8 is transmitted to transmitter 15 through gate 12 after the correction is given to the time difference due to the pass band width difference to BPF13 via delay circuit 11. After this, transmitter 15 modulates the output sent from local oscillator 16 and then transmits it through transmission antenna 17 in the form of transmission wave 18.
JP3637179A 1979-03-28 1979-03-28 Radio communication system Pending JPS55128928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3637179A JPS55128928A (en) 1979-03-28 1979-03-28 Radio communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3637179A JPS55128928A (en) 1979-03-28 1979-03-28 Radio communication system

Publications (1)

Publication Number Publication Date
JPS55128928A true JPS55128928A (en) 1980-10-06

Family

ID=12467971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3637179A Pending JPS55128928A (en) 1979-03-28 1979-03-28 Radio communication system

Country Status (1)

Country Link
JP (1) JPS55128928A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7065137B2 (en) * 2002-01-24 2006-06-20 Hewlett-Packard Development Company, L.P. Difference messaging protocol that uses prior state information

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7065137B2 (en) * 2002-01-24 2006-06-20 Hewlett-Packard Development Company, L.P. Difference messaging protocol that uses prior state information

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