JPS5651147A - Turn-on sequence detecting circuit - Google Patents

Turn-on sequence detecting circuit

Info

Publication number
JPS5651147A
JPS5651147A JP12761479A JP12761479A JPS5651147A JP S5651147 A JPS5651147 A JP S5651147A JP 12761479 A JP12761479 A JP 12761479A JP 12761479 A JP12761479 A JP 12761479A JP S5651147 A JPS5651147 A JP S5651147A
Authority
JP
Japan
Prior art keywords
circuit
turn
signal
sequence
given
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
JP12761479A
Other languages
Japanese (ja)
Inventor
Kenji Inoue
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 JP12761479A priority Critical patent/JPS5651147A/en
Publication of JPS5651147A publication Critical patent/JPS5651147A/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
    • H04L27/22—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)
  • Communication Control (AREA)

Abstract

PURPOSE:To detect the start point of an accurate turn-on sequence, by utilizing the character of the turn-on sequence signal having a linear spectrum only at the Nyquist frequency point. CONSTITUTION:Phase inversion signals 1 of 0 deg. and 180 deg. following nonsignal are given to demodulator 2 to obtain the demodulation signal having a linear spectrum only at the Nyquist frequency point. In-phase signal 18 of this demodulation signal is applied to the digital filter consisting of delay circuit 3 and adding circuit 11, and antiphase signal 19 is applied to the digital filter consisting of delay circuit 5 and adding circuit 12. Outputs of these filters are given to square summing circuit 13, and the output level is decided by deciding circuit 14, and energy of input signals 1 is detected to operate level deciding circuit 14 only for the time corresponding to detected energy above by timer 16, thereby obtaining start detection output 17 of the turn-on sequence.
JP12761479A 1979-10-02 1979-10-02 Turn-on sequence detecting circuit Pending JPS5651147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12761479A JPS5651147A (en) 1979-10-02 1979-10-02 Turn-on sequence detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12761479A JPS5651147A (en) 1979-10-02 1979-10-02 Turn-on sequence detecting circuit

Publications (1)

Publication Number Publication Date
JPS5651147A true JPS5651147A (en) 1981-05-08

Family

ID=14964438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12761479A Pending JPS5651147A (en) 1979-10-02 1979-10-02 Turn-on sequence detecting circuit

Country Status (1)

Country Link
JP (1) JPS5651147A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6657154B1 (en) 1996-05-31 2003-12-02 Nec Corporation Semiconductor manufacturing apparatus and manufacturing method for thin film semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6657154B1 (en) 1996-05-31 2003-12-02 Nec Corporation Semiconductor manufacturing apparatus and manufacturing method for thin film semiconductor device

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