GB1137132A - Improvements in or relating to frequency modulation receivers - Google Patents

Improvements in or relating to frequency modulation receivers

Info

Publication number
GB1137132A
GB1137132A GB485065A GB485065A GB1137132A GB 1137132 A GB1137132 A GB 1137132A GB 485065 A GB485065 A GB 485065A GB 485065 A GB485065 A GB 485065A GB 1137132 A GB1137132 A GB 1137132A
Authority
GB
United Kingdom
Prior art keywords
pulses
pulse generator
signal
frequency modulation
feb
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.)
Expired
Application number
GB485065A
Inventor
Peter Murdo Montgomery
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB485065A priority Critical patent/GB1137132A/en
Publication of GB1137132A publication Critical patent/GB1137132A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/06—Demodulating pulses which have been modulated with a continuously-variable signal of frequency- or rate-modulated pulses

Landscapes

  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1,137,132. F.M. receiver. ELECTRIC & MUSICAL INDUSTRIES Ltd. 2 Feb., 1966 [4 Feb., 1965], No. 4850/65. Headings H3A and H3R. A frequency modulation receiver comprises a tuner and frequency changer 2, an I.F. amplifier 3, a squarer 4, which may include a limiter, for squaring the I.F. signal, a differentiator 5 for deriving a series of short negative and positive pulses from the squared signal, a monostable pulse generator 6 triggered into its unstable state by pulses of one polarity and a switching circuit 7 controlled by the output of the pulse generator which controls the direction of current flow through a speaker 8. The switching circuit includes a pair of transistors acting as switches one of which is closed to feed current through the speaker in one direction during the occurrence of the control pulse and the other is closed to feed current in the opposite direction during the intervals between the pulses. The pulse generator is designed to supply an output pulse having a fixed duration equal to half the time period of the I.F. signal.
GB485065A 1965-02-04 1965-02-04 Improvements in or relating to frequency modulation receivers Expired GB1137132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB485065A GB1137132A (en) 1965-02-04 1965-02-04 Improvements in or relating to frequency modulation receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB485065A GB1137132A (en) 1965-02-04 1965-02-04 Improvements in or relating to frequency modulation receivers

Publications (1)

Publication Number Publication Date
GB1137132A true GB1137132A (en) 1968-12-18

Family

ID=9784981

Family Applications (1)

Application Number Title Priority Date Filing Date
GB485065A Expired GB1137132A (en) 1965-02-04 1965-02-04 Improvements in or relating to frequency modulation receivers

Country Status (1)

Country Link
GB (1) GB1137132A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451661A1 (en) * 1979-03-14 1980-10-10 Itt DIGITAL FREQUENCY DEMODULATION CIRCUIT FOR SOUND REPRODUCTION IN A RADIO OR TELEVISION RECEIVER, IN PARTICULAR A COLOR TELEVISION RECEIVER
EP1076421A2 (en) * 1999-08-11 2001-02-14 Communications Research Laboratory, Ministry of Posts and Telecommunications Radio communication apparatus and radio communication method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451661A1 (en) * 1979-03-14 1980-10-10 Itt DIGITAL FREQUENCY DEMODULATION CIRCUIT FOR SOUND REPRODUCTION IN A RADIO OR TELEVISION RECEIVER, IN PARTICULAR A COLOR TELEVISION RECEIVER
EP1076421A2 (en) * 1999-08-11 2001-02-14 Communications Research Laboratory, Ministry of Posts and Telecommunications Radio communication apparatus and radio communication method
EP1076421A3 (en) * 1999-08-11 2004-08-11 National Institute of Information and Communications Technology, Independent Administrative Institution Radio communication apparatus and radio communication method
US6826234B1 (en) 1999-08-11 2004-11-30 National Institute Of Information And Communications Technology Radio communication apparatus and radio communication method

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