JPS5644289A - Signal receiver - Google Patents

Signal receiver

Info

Publication number
JPS5644289A
JPS5644289A JP12136779A JP12136779A JPS5644289A JP S5644289 A JPS5644289 A JP S5644289A JP 12136779 A JP12136779 A JP 12136779A JP 12136779 A JP12136779 A JP 12136779A JP S5644289 A JPS5644289 A JP S5644289A
Authority
JP
Japan
Prior art keywords
output
gain
circuit
voltage
filter
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
JP12136779A
Other languages
Japanese (ja)
Inventor
Sadao Niga
Shinichiro Shiraishi
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 JP12136779A priority Critical patent/JPS5644289A/en
Publication of JPS5644289A publication Critical patent/JPS5644289A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current

Landscapes

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

Abstract

PURPOSE:To improve the electric characteristic of a unit, by setting the maximum output voltage of the first rectifying circuit between the maximum output voltage of the second rectifying circuit and the DC bias voltage in the suppression type signal receiver used in the in-band single frequency signal system. CONSTITUTION:Differential and integral amplifying circuit 10 has a feedback system and sets the gain to a value lower than the gain of the IF in the low frequency and the high frequency of the sound band, and the output of circuit 10 is sent to active band-pass filter 20. The output of filter 20 is rectified in 30, and the input and the output of filter 20 are subjected to summing amplification by voltage adding circuit 40, and the gain for the output signal of filter 20 in the centre frequency is so set that the gain above may be lower than the gain for the input signal by voltage gain components of filter 20. The output is rectified by rectifying circuit 50, and a constsnt DC bias voltage is applied to this rectified output, and output voltages of circuits 30 and 50 are compared with each other in 60, and the maximum output voltage of circuit 30 is set between the maximum output voltage of circuit 50 and the DC bias voltage, thus improving the electric characteristic of the unit.
JP12136779A 1979-09-20 1979-09-20 Signal receiver Pending JPS5644289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12136779A JPS5644289A (en) 1979-09-20 1979-09-20 Signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12136779A JPS5644289A (en) 1979-09-20 1979-09-20 Signal receiver

Publications (1)

Publication Number Publication Date
JPS5644289A true JPS5644289A (en) 1981-04-23

Family

ID=14809484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12136779A Pending JPS5644289A (en) 1979-09-20 1979-09-20 Signal receiver

Country Status (1)

Country Link
JP (1) JPS5644289A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172495A (en) * 1984-09-18 1986-04-14 Nippon Telegr & Teleph Corp <Ntt> Signal receiver
JPS63250932A (en) * 1987-03-31 1988-10-18 シーメンス・ニックスドルフ・インフォメーションシステム・アクチェンゲゼルシャフト Circuit system for double-voice and multifrequency signal detection in telephone equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172495A (en) * 1984-09-18 1986-04-14 Nippon Telegr & Teleph Corp <Ntt> Signal receiver
JPS63250932A (en) * 1987-03-31 1988-10-18 シーメンス・ニックスドルフ・インフォメーションシステム・アクチェンゲゼルシャフト Circuit system for double-voice and multifrequency signal detection in telephone equipment

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