ES473702A1 - Mejoras en receptores estereofonicos en am - Google Patents

Mejoras en receptores estereofonicos en am

Info

Publication number
ES473702A1
ES473702A1 ES473702A ES473702A ES473702A1 ES 473702 A1 ES473702 A1 ES 473702A1 ES 473702 A ES473702 A ES 473702A ES 473702 A ES473702 A ES 473702A ES 473702 A1 ES473702 A1 ES 473702A1
Authority
ES
Spain
Prior art keywords
signal
receiver
difference signal
phi
demodulated
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
ES473702A
Other languages
English (en)
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of ES473702A1 publication Critical patent/ES473702A1/es
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
    • H04H20/49—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for AM stereophonic broadcast systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

Mejoras en receptores estereofónicos en AM, para recibir una onda portadora modulada en amplitud con información de señal proporcional a la suma de unas señales de inteligencia primera (A) y la segunda (B), y que está modulada en fase con una señal proporcional a un ángulo fi que tiene la forma fi = arc. tang. (C1(A - B)/C2 + A +B), en donde C1 y C2 son constantes receptor de un circuito de entrada para recibir dicha señal y derivar de la misma una señal de frecuencia intermedia, y un circuito detector de envoltura acoplado al circuito de entrada, para detectar la modulación de amplitud en la señal de frecuencia intermedia, caracterizado porque se dota a cada receptor de un circuito detector síncrono acoplado al circuito de entrada para proporcionar una salida proporcional a (L - R)cos. fi, un circuito corrector acoplado al circuito de entrada y al circuito detector síncrono para proporcionar una salida proporcional a A - B, y una matriz para elaborar las señales A + B para proporcionar salidas A y B separadas.
ES473702A 1977-09-27 1978-09-27 Mejoras en receptores estereofonicos en am Expired ES473702A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/837,258 US4192968A (en) 1977-09-27 1977-09-27 Receiver for compatible AM stereo signals

Publications (1)

Publication Number Publication Date
ES473702A1 true ES473702A1 (es) 1979-04-01

Family

ID=25273974

Family Applications (1)

Application Number Title Priority Date Filing Date
ES473702A Expired ES473702A1 (es) 1977-09-27 1978-09-27 Mejoras en receptores estereofonicos en am

Country Status (20)

Country Link
US (1) US4192968A (es)
JP (1) JPS5457903A (es)
AU (1) AU511851B2 (es)
BR (1) BR7806241A (es)
CA (1) CA1129965A (es)
CH (1) CH633401A5 (es)
DE (1) DE2841428A1 (es)
ES (1) ES473702A1 (es)
FR (1) FR2404348B1 (es)
GB (1) GB2005520B (es)
HK (1) HK26085A (es)
IL (1) IL55420A (es)
IT (1) IT1098913B (es)
MX (1) MX146418A (es)
NL (2) NL180062B (es)
NO (1) NO782914L (es)
PT (1) PT68587A (es)
SE (1) SE438393B (es)
SG (1) SG92484G (es)
ZA (1) ZA785456B (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170716A (en) * 1977-10-14 1979-10-09 Motorola, Inc. AM stereo receiver with correction limiting
JPS6029251Y2 (ja) * 1979-11-29 1985-09-04 ソニー株式会社 Ａｍステレオ受信機
US4581766A (en) * 1980-07-02 1986-04-08 Motorola, Inc. Trigonometric transform function generator
US4379208A (en) * 1980-11-13 1983-04-05 National Semiconductor Corporation AM Stereo receiver logic
JPS57171845A (en) * 1981-04-15 1982-10-22 Sony Corp Phase locked loop circuit
US4410762A (en) 1981-05-12 1983-10-18 Motorola, Inc. Dual mode tone detector circuit
JPS58206250A (ja) * 1982-05-27 1983-12-01 Sony Corp Ａｍステレオ受信機
US4504966A (en) * 1983-05-31 1985-03-12 Harris Corporation Stereo inhibitor for AM stereo receiver
US4747141A (en) * 1983-10-24 1988-05-24 Kahn Leonard R AM stereo signal decoder
US4716590A (en) * 1984-01-17 1987-12-29 Sansui Electric Co., Ltd. AM stereo transmission method and apparatus
US4680794A (en) * 1986-07-29 1987-07-14 Motorola, Inc. AM stereo system with modified spectrum
US5222144A (en) * 1991-10-28 1993-06-22 Ford Motor Company Digital quadrature radio receiver with two-step processing
US6459796B1 (en) 1998-06-24 2002-10-01 Visteon Global Technologies, Inc. AM stereo receiver with reduced distortion
US8392176B2 (en) * 2006-04-10 2013-03-05 Qualcomm Incorporated Processing of excitation in audio coding and decoding
US20090198500A1 (en) * 2007-08-24 2009-08-06 Qualcomm Incorporated Temporal masking in audio coding based on spectral dynamics in frequency sub-bands
US8428957B2 (en) 2007-08-24 2013-04-23 Qualcomm Incorporated Spectral noise shaping in audio coding based on spectral dynamics in frequency sub-bands

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068475A (en) * 1959-10-07 1962-12-11 Rca Corp Stereophonic sound signalling system
US3080453A (en) * 1959-11-13 1963-03-05 Rca Corp Stereophonic sound receiver system
NL6608507A (es) * 1966-06-18 1967-12-19
US3823268A (en) * 1972-06-07 1974-07-09 Mc Intosh Labor Inc Dynamic stereo separation control
US4018994A (en) * 1974-07-10 1977-04-19 Kahn Leonard R Compatible AM stereophonic receivers
US4037057A (en) * 1974-08-01 1977-07-19 Nippon Gakki Seizo Kabushiki Kaisha Noise-cancelling apparatus for FM stereo receiver
GB1565405A (en) * 1976-04-07 1980-04-23 Motorola Inc Compatible am stereo broadcast system including transmitter and receiver

Also Published As

Publication number Publication date
NL180062C (nl)
IT1098913B (it) 1985-09-18
NL7809761A (nl) 1979-03-29
PT68587A (en) 1978-10-01
ZA785456B (en) 1979-09-26
IL55420A0 (en) 1978-10-31
GB2005520A (en) 1979-04-19
IT7828026A0 (it) 1978-09-25
DE2841428A1 (de) 1979-03-29
NO782914L (no) 1979-03-28
JPS5457903A (en) 1979-05-10
BR7806241A (pt) 1979-05-08
AU4003778A (en) 1980-03-27
SE7810126L (sv) 1979-03-28
CH633401A5 (de) 1982-11-30
NL180062B (nl) 1986-07-16
SG92484G (en) 1985-06-14
DE2841428C2 (es) 1988-02-04
MX146418A (es) 1982-06-24
GB2005520B (en) 1982-01-20
IL55420A (en) 1980-07-31
FR2404348B1 (fr) 1986-05-23
SE438393B (sv) 1985-04-15
JPS568528B2 (es) 1981-02-24
HK26085A (en) 1985-04-04
AU511851B2 (en) 1980-09-11
CA1129965A (en) 1982-08-17
FR2404348A1 (fr) 1979-04-20
US4192968A (en) 1980-03-11

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19990222