JPS5563152A - Digital signal processor with control function for fsk demodulator circuit - Google Patents

Digital signal processor with control function for fsk demodulator circuit

Info

Publication number
JPS5563152A
JPS5563152A JP13655578A JP13655578A JPS5563152A JP S5563152 A JPS5563152 A JP S5563152A JP 13655578 A JP13655578 A JP 13655578A JP 13655578 A JP13655578 A JP 13655578A JP S5563152 A JPS5563152 A JP S5563152A
Authority
JP
Japan
Prior art keywords
control
circuit
fsk
pll2
demodulator circuit
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
JP13655578A
Other languages
Japanese (ja)
Inventor
Shigeru Komatsu
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 Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP13655578A priority Critical patent/JPS5563152A/en
Publication of JPS5563152A publication Critical patent/JPS5563152A/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)

Abstract

PURPOSE:To realize the control for the PLL oscillation frequency of the FSK demodulator circuit with an economical structure by installing the change-over switch at the input side of the speaker amplifier to select the output of the FSK demodulator circuit or the output of the aural signal generator means. CONSTITUTION:In the microcomputer system incorporating the aural output circuit, the FSK modulation signal is supplied to PLL2 and then demodulated at comparator 4 to be supplied to serial-parallel converter circuit 8. The data converted into the parallel signals at circuit 8 is supplied to microprocessor 10 and the delivered in the form of the voice through speaker 6 and via D/A converter 9, change-over switch 7 and amplifier 15 each. When the oscillation frequency of PLL2 is controlled, switch 7 is turned toward comparator 4 along with the FSK demodulation signal being put into amplifier 15. Then PLL control knob 12 is turned to secure the control to the oscillation frequency of PLL2 so that only the low frequency tone, i.e., the serial digital signal after demodulation may be heared. After control, switch 7 is turned to the side of converter 9. In such way, an economical control is possible for the PLL.
JP13655578A 1978-11-06 1978-11-06 Digital signal processor with control function for fsk demodulator circuit Pending JPS5563152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13655578A JPS5563152A (en) 1978-11-06 1978-11-06 Digital signal processor with control function for fsk demodulator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13655578A JPS5563152A (en) 1978-11-06 1978-11-06 Digital signal processor with control function for fsk demodulator circuit

Publications (1)

Publication Number Publication Date
JPS5563152A true JPS5563152A (en) 1980-05-13

Family

ID=15177953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13655578A Pending JPS5563152A (en) 1978-11-06 1978-11-06 Digital signal processor with control function for fsk demodulator circuit

Country Status (1)

Country Link
JP (1) JPS5563152A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5080932A (en) * 1989-08-02 1992-01-14 Mhb Joint Venture Method for coating lithium on a substrate
US5169446A (en) * 1989-08-02 1992-12-08 Mhb Joint Venture Method and apparatus for coating alkali or alkaline earth metals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5080932A (en) * 1989-08-02 1992-01-14 Mhb Joint Venture Method for coating lithium on a substrate
US5169446A (en) * 1989-08-02 1992-12-08 Mhb Joint Venture Method and apparatus for coating alkali or alkaline earth metals

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