JPS5616354A - Fsk modulating system - Google Patents

Fsk modulating system

Info

Publication number
JPS5616354A
JPS5616354A JP9280979A JP9280979A JPS5616354A JP S5616354 A JPS5616354 A JP S5616354A JP 9280979 A JP9280979 A JP 9280979A JP 9280979 A JP9280979 A JP 9280979A JP S5616354 A JPS5616354 A JP S5616354A
Authority
JP
Japan
Prior art keywords
signal
signals
synchronized
synchronization
integer
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
JP9280979A
Other languages
Japanese (ja)
Inventor
Fumiki Sone
Mitsuo Imai
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.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP9280979A priority Critical patent/JPS5616354A/en
Publication of JPS5616354A publication Critical patent/JPS5616354A/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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
    • H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period

Abstract

PURPOSE:To eliminate the discontinuation of the phase at the switching point of the input data and then increase the reliability, by securing f1=(n-1)B and f2=nB (n>= integer of 2; B: modulating speed) each and at the same time securing the synchronization with the signal of frequency fs=B. CONSTITUTION:If modulating speed B=1,200 Baud and integer n=2 are set each, the signals (f), (c) and (d) having the frequencies fs=B=1,200Hz, f1=(n-1)B= 1,200Hz and f2=nB=2,400Hz each are delivered from signal generating circuit 4. In this case, signals (c) and (d) are synchronized with signal (f). Then input data (a) is synchronized with signal (f) having frequency fs at synchronizing circuit 5 to be formed like signal (e). Thus this signal (e) is modulated at modulating circuit 3 and by signals (c) and (d) to obtain FSK modulation signal (b). In this case, the synchronization is secured perfectly among data (a), signal (c) and signal (d) each. Thus the phase discontinuation which occurs hitherto is never caused to signal (b).
JP9280979A 1979-07-20 1979-07-20 Fsk modulating system Pending JPS5616354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9280979A JPS5616354A (en) 1979-07-20 1979-07-20 Fsk modulating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9280979A JPS5616354A (en) 1979-07-20 1979-07-20 Fsk modulating system

Publications (1)

Publication Number Publication Date
JPS5616354A true JPS5616354A (en) 1981-02-17

Family

ID=14064729

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9280979A Pending JPS5616354A (en) 1979-07-20 1979-07-20 Fsk modulating system

Country Status (1)

Country Link
JP (1) JPS5616354A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234152A (en) * 1985-04-09 1986-10-18 Toshiba Corp Frequency shift keying modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234152A (en) * 1985-04-09 1986-10-18 Toshiba Corp Frequency shift keying modulator

Similar Documents

Publication Publication Date Title
KR920022684A (en) Frequency Control Oscillator for High Frequency Phase-Locked Loop
KR850003644A (en) Frequency detector
JPS562761A (en) Clock reproducing circuit
AUPM587094A0 (en) Microwave loop oscillators
GB1358782A (en) Frequency division multiplex communication systems
JPS5616354A (en) Fsk modulating system
GB1171753A (en) Phase Coherent Synchronization.
JPS55147060A (en) Fsk and psk modulating circuit
JPS5725755A (en) Waveform superposed fsk modulator
GB815580A (en) A frequency stabilisation system employing phase shifting means with resonant sections
JPS52129358A (en) Wide-band phase locked loop circuit
JPS54133812A (en) Phase synchronous circuit
GB981399A (en) Synchronization system for a data communication system
JPS5333038A (en) Phase synchronizing oscillator
JPS57132444A (en) Carrier frequency controlling system for slave station applied to multidirection multiplex communication system
JPS55105459A (en) Signal transmission system
JPS5248956A (en) Single side-wave signal generator equipment
JPS5687967A (en) Carrier wave reproduction circuit
JPS5350917A (en) Chrominance component recording system
GB1060173A (en) Frequency diversity transmitting system
JPS58194410A (en) Frequency modulator
JPS5635559A (en) Phase modulating device
JPS5546659A (en) Data information reproduction system
JPS55149554A (en) Carrier reproducing circuit
JPS54558A (en) Modulation and demodulation system