JPS645121A - Noise suppression device for fm transmitter-receiver - Google Patents

Noise suppression device for fm transmitter-receiver

Info

Publication number
JPS645121A
JPS645121A JP16044087A JP16044087A JPS645121A JP S645121 A JPS645121 A JP S645121A JP 16044087 A JP16044087 A JP 16044087A JP 16044087 A JP16044087 A JP 16044087A JP S645121 A JPS645121 A JP S645121A
Authority
JP
Japan
Prior art keywords
frequency
oscillated
stage
noise
reception system
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
JP16044087A
Other languages
Japanese (ja)
Inventor
Takayoshi Rachi
Shigeru Takahashi
Okiyasu Aikawa
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.)
Tokyo Gas Co Ltd
Sankosha Co Ltd
Original Assignee
Tokyo Gas Co Ltd
Sankosha 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 Tokyo Gas Co Ltd, Sankosha Co Ltd filed Critical Tokyo Gas Co Ltd
Priority to JP16044087A priority Critical patent/JPS645121A/en
Publication of JPS645121A publication Critical patent/JPS645121A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To attain stable noise suppression by adding a single frequency oscillation circuit oscillated at the center frequency of a frequency discriminator and injecting normally its oscillated output to a reception system to a pre-stage of a frequency discriminator. CONSTITUTION:The oscillator of a single frequency oscillated at the center frequency of a frequency discriminator 6 is added as a noise suppression signal injection circuit 9 to at least the pre-stage of the frequency discriminator 6 in the reception system such as the pre-stage of a filter 3. The injection circuit 9 is used to inject the oscillated output to the reception system of the FM receiver with a slightly larger amplitude than that of the momentary frequency of expected noise thereby obtaining it as a suppression signal. Thus, the noise is suppressed stably and the read error of a start it at the data transmission start from the no signal state and the instability of the receiving state when the input signal reaches the vicinity of the limit of the reception sensitivity are eliminated.
JP16044087A 1987-06-27 1987-06-27 Noise suppression device for fm transmitter-receiver Pending JPS645121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16044087A JPS645121A (en) 1987-06-27 1987-06-27 Noise suppression device for fm transmitter-receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16044087A JPS645121A (en) 1987-06-27 1987-06-27 Noise suppression device for fm transmitter-receiver

Publications (1)

Publication Number Publication Date
JPS645121A true JPS645121A (en) 1989-01-10

Family

ID=15714979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16044087A Pending JPS645121A (en) 1987-06-27 1987-06-27 Noise suppression device for fm transmitter-receiver

Country Status (1)

Country Link
JP (1) JPS645121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0470089A1 (en) * 1989-04-26 1992-02-12 Motorola, Inc. Receiver threshold extension
WO2001089100A1 (en) * 2000-05-17 2001-11-22 Infineon Technologies Ag Method and device for avoiding a parasitic state

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0470089A1 (en) * 1989-04-26 1992-02-12 Motorola, Inc. Receiver threshold extension
JPH04504935A (en) * 1989-04-26 1992-08-27 モトローラ・インコーポレイテッド Receiving Device Threshold Expansion
WO2001089100A1 (en) * 2000-05-17 2001-11-22 Infineon Technologies Ag Method and device for avoiding a parasitic state
US6765970B2 (en) 2000-05-17 2004-07-20 Infienon Technologies Ag Method and apparatus for preventing interference

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