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JPS5527753A - Demodulation system for digital fm signal - Google Patents

Demodulation system for digital fm signal

Info

Publication number
JPS5527753A
JPS5527753A JP10088278A JP10088278A JPS5527753A JP S5527753 A JPS5527753 A JP S5527753A JP 10088278 A JP10088278 A JP 10088278A JP 10088278 A JP10088278 A JP 10088278A JP S5527753 A JPS5527753 A JP S5527753A
Authority
JP
Japan
Prior art keywords
circuit
output
bit delay
signal
logical sum
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
JP10088278A
Other languages
Japanese (ja)
Inventor
Kazuaki Murota
Kenkichi Hiraide
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP10088278A priority Critical patent/JPS5527753A/en
Publication of JPS5527753A publication Critical patent/JPS5527753A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To simplify the signal identification by demodulating the reception signal and the double signals which are delayed from the reception signal via the sine and cosine phase comparators and then regenerating these signals regarded as the convolutional code row and the parity code row of correction for the error of transmission efficiency 1/2 and 1. CONSTITUTION:The reception signal sent from input terminal 1 is applied to 1-bit delay circuit 5 as well as to sine and cosine phase comparators 6 and 7. Then the output signal delayed at circuit 5 is also applied to comparators band 7, and the output of comparator 6 undergoes the code regeneration through identification regenerator circuit 8 to be turned to the sine wave phase detection output. In the same way, the output of comparator 7 undergoes the code regeneration through identification regenerator circuit 9 and is then sent to half-bit delay circuit 10 to be changed into the cosine phase detection output. After this, the output of circuits 8 and 10 are applied to 1-bit delay circuit 11 and exclusive logical sum circuit 13 each, and the output of circuit 11 is delivered from terminal 2 via exclusive logical sum circuit 17. At the same time, the output of circuit 13 is applied to circuit 17 via 1-bit delay circuit 15 and exclusive logical sum circuit 16 to compound the output of terminal 2.
JP10088278A 1978-08-21 1978-08-21 Demodulation system for digital fm signal Pending JPS5527753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10088278A JPS5527753A (en) 1978-08-21 1978-08-21 Demodulation system for digital fm signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10088278A JPS5527753A (en) 1978-08-21 1978-08-21 Demodulation system for digital fm signal

Publications (1)

Publication Number Publication Date
JPS5527753A true JPS5527753A (en) 1980-02-28

Family

ID=14285691

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10088278A Pending JPS5527753A (en) 1978-08-21 1978-08-21 Demodulation system for digital fm signal

Country Status (1)

Country Link
JP (1) JPS5527753A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132494A (en) * 1983-12-21 1985-07-15 Sony Corp Processor of pal carrier chrominance signal
US4567442A (en) * 1981-11-19 1986-01-28 Siemens Aktiengesellschaft Method and apparatus for demodulating time-discrete frequency-modulated signals
JPS6153890A (en) * 1984-08-24 1986-03-17 Sony Corp Time base error correcting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341162A (en) * 1976-09-28 1978-04-14 Nippon Telegr & Teleph Corp <Ntt> Demodulation system for phase continuous frequency shift keying modulation signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341162A (en) * 1976-09-28 1978-04-14 Nippon Telegr & Teleph Corp <Ntt> Demodulation system for phase continuous frequency shift keying modulation signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567442A (en) * 1981-11-19 1986-01-28 Siemens Aktiengesellschaft Method and apparatus for demodulating time-discrete frequency-modulated signals
JPS60132494A (en) * 1983-12-21 1985-07-15 Sony Corp Processor of pal carrier chrominance signal
JPH0453156B2 (en) * 1983-12-21 1992-08-25 Sony Corp
JPS6153890A (en) * 1984-08-24 1986-03-17 Sony Corp Time base error correcting device

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