JPS555513A - Data transmission unit - Google Patents

Data transmission unit

Info

Publication number
JPS555513A
JPS555513A JP7770978A JP7770978A JPS555513A JP S555513 A JPS555513 A JP S555513A JP 7770978 A JP7770978 A JP 7770978A JP 7770978 A JP7770978 A JP 7770978A JP S555513 A JPS555513 A JP S555513A
Authority
JP
Japan
Prior art keywords
signal
fed
counter
gate
level
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
JP7770978A
Other languages
Japanese (ja)
Inventor
Hiroshi Sekiguchi
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.)
TAU GIKEN KK
Original Assignee
TAU GIKEN KK
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 TAU GIKEN KK filed Critical TAU GIKEN KK
Priority to JP7770978A priority Critical patent/JPS555513A/en
Publication of JPS555513A publication Critical patent/JPS555513A/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
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H04L27/122—Modulator circuits; Transmitter circuits using digital generation of carrier signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To enable to discriminate the digital signal corresponding to the carrier, by synchronizing the time of shift for the modulation signal to the time point when a half or one wave of the carrier corresponding to each level of the modulation signal is finished. CONSTITUTION:The digital signal train in binary number for the transmission is memorized in the memory circuit 1 and the output is fed to the D type FF2. The FF2 feeds one signal level to the AND gate 3 when the signal fed is 0 signal and to the gate 4 when 1 signal. The means C outputting the carrier having each frequency corresponding to the level of the modulation signal delivers the signal in frequency f1 or f2 when 1 signal is fed to the AND gate 3 or 4, to the counter 7. When the signal in frequency f1 or f2 is inputted to the counter 7, the pulses of 0 to 2<n> are counted and the count value is outputted. The sinusoidal synthesis circuit 9 outputs the sinusoidal wave of one period every time this signal is received. The output of the counter 7 is fed also to FF2 to shift the signal fetched to FF2 and to fetch the next signal from the circuit 1.
JP7770978A 1978-06-27 1978-06-27 Data transmission unit Pending JPS555513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7770978A JPS555513A (en) 1978-06-27 1978-06-27 Data transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7770978A JPS555513A (en) 1978-06-27 1978-06-27 Data transmission unit

Publications (1)

Publication Number Publication Date
JPS555513A true JPS555513A (en) 1980-01-16

Family

ID=13641413

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7770978A Pending JPS555513A (en) 1978-06-27 1978-06-27 Data transmission unit

Country Status (1)

Country Link
JP (1) JPS555513A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152761A (en) * 1983-02-18 1984-08-31 Sumitomo Electric Ind Ltd Digital FSK modulation circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152761A (en) * 1983-02-18 1984-08-31 Sumitomo Electric Ind Ltd Digital FSK modulation circuit

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