GB1447814A – Matrix four-channel decoding system
– Google Patents
GB1447814A – Matrix four-channel decoding system
– Google Patents
Matrix four-channel decoding system
Info
Publication number
GB1447814A
GB1447814A
GB3603474A
GB3603474A
GB1447814A
GB 1447814 A
GB1447814 A
GB 1447814A
GB 3603474 A
GB3603474 A
GB 3603474A
GB 3603474 A
GB3603474 A
GB 3603474A
GB 1447814 A
GB1447814 A
GB 1447814A
Authority
GB
United Kingdom
Prior art keywords
decoder
high frequency
gain
low
coefficients
Prior art date
1973-08-20
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
GB3603474A
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.)
Sansui Electric Co Ltd
Original Assignee
Sansui 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.)
1973-08-20
Filing date
1974-08-15
Publication date
1976-09-02
1974-08-15
Application filed by Sansui Electric Co Ltd
filed
Critical
Sansui Electric Co Ltd
1976-09-02
Publication of GB1447814A
publication
Critical
patent/GB1447814A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04H—BROADCAST COMMUNICATION
H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
H04H20/86—Arrangements characterised by the broadcast information itself
H04H20/88—Stereophonic broadcast systems
H04H20/89—Stereophonic broadcast systems using three or more audio channels, e.g. triphonic or quadraphonic
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04S—STEREOPHONIC SYSTEMS
H04S3/00—Systems employing more than two channels, e.g. quadraphonic
H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
Abstract
1447814 Quadraphonic decoders; gain control SANSUI ELECTRIC CO Ltd 15 Aug 1974 [20 Aug 1973] 36034/74 Heading H4R In a 2-4 quadraphonic decoder in which the matrix coefficients are automatically varied according to the instantaneous amplitude relationship between the directional components in the two composite input signals, the decoded front and rear channel pairs are fed to respective mixers 48, 49 which only mix the low frequency components (i.e. <500 Hz) without significantly affecting the high frequency components. For low frequencies the front mixer outputs correspond to the sum of the composite input signals and the rear mixer outputs to the difference. The provision of the mixers is tantamount to fixing the coefficients f=b=0 and l=r= 1 in the decoder of Specification 1,434,471. (Fig. 1). In Fig. 4, at low frequencies the capacitive impedances are high and mixing occurs via R12, R13 whereas at higher frequencies the mixing path R12, C12 provides an attenuating low pass filter. The high frequency level is reduced by 6 dB to produce a flat response by R12 in combination with the output impedance of the decoder. The circuit admits of integration and may alternatively be composed of integrated differential amplifiers. Variable gain amplifiers performing the function of the above coefficients consist of a gate-controlled FET (Q2, Fig. 2, not shown) shunting an emitter current source (60) so that low frequency gain is zero but high frequency gain is RC limited.
GB3603474A
1973-08-20
1974-08-15
Matrix four-channel decoding system
Expired
GB1447814A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP48093097A
JPS5248001B2
(en)
1973-08-20
1973-08-20
Publications (1)
Publication Number
Publication Date
GB1447814A
true
GB1447814A
(en)
1976-09-02
Family
ID=14073006
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3603474A
Expired
GB1447814A
(en)
1973-08-20
1974-08-15
Matrix four-channel decoding system
Country Status (4)
Country
Link
US
(1)
US3934086A
(en)
JP
(1)
JPS5248001B2
(en)
DE
(1)
DE2439863C2
(en)
GB
(1)
GB1447814A
(en)
Families Citing this family (19)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS5145503A
(en)
*
1974-10-16
1976-04-19
Sansui Electric Co
Matorikusu 4 channeruyodekooda
JPS5154401A
(en)
*
1974-11-07
1976-05-13
Sansui Electric Co
Matorikusu 4 channeruyodekooda
JPS5331601U
(en)
*
1976-08-23
1978-03-18
US4704728A
(en)
*
1984-12-31
1987-11-03
Peter Scheiber
Signal re-distribution, decoding and processing in accordance with amplitude, phase, and other characteristics
US4799260A
(en)
*
1985-03-07
1989-01-17
Dolby Laboratories Licensing Corporation
Variable matrix decoder
US5046098A
(en)
*
1985-03-07
1991-09-03
Dolby Laboratories Licensing Corporation
Variable matrix decoder with three output channels
US4862502A
(en)
*
1988-01-06
1989-08-29
Lexicon, Inc.
Sound reproduction
JPH0228200U
(en)
*
1988-08-12
1990-02-23
JP3006059B2
(en)
*
1990-09-17
2000-02-07
ソニー株式会社
Sound field expansion device
ATE138238T1
(en)
*
1991-01-08
1996-06-15
Dolby Lab Licensing Corp
ENCODER/DECODER FOR MULTI-DIMENSIONAL SOUND FIELDS
US5136650A
(en)
*
1991-01-09
1992-08-04
Lexicon, Inc.
Sound reproduction
US5870480A
(en)
*
1996-07-19
1999-02-09
Lexicon
Multichannel active matrix encoder and decoder with maximum lateral separation
US6697491B1
(en)
*
1996-07-19
2004-02-24
Harman International Industries, Incorporated
5-2-5 matrix encoder and decoder system
US5796844A
(en)
*
1996-07-19
1998-08-18
Lexicon
Multichannel active matrix sound reproduction with maximum lateral separation
JP4478220B2
(en)
1997-05-29
2010-06-09
ソニー株式会社
Sound field correction circuit
EP1013140B1
(en)
*
1997-09-05
2012-12-05
Harman International Industries, Incorporated
5-2-5 matrix decoder system
US6016473A
(en)
*
1998-04-07
2000-01-18
Dolby; Ray M.
Low bit-rate spatial coding method and system
JP4151110B2
(en)
*
1998-05-14
2008-09-17
ソニー株式会社
Audio signal processing apparatus and audio signal reproduction apparatus
EP2952016B1
(en)
*
2013-02-04
2018-09-26
Kronoton GmbH
Method for processing a multichannel sound in a multichannel sound system
Family Cites Families (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2904632A
(en)
*
1958-07-28
1959-09-15
Univ Loudspeakers Inc
Stereophonic sound propagation system
US3094587A
(en)
*
1960-07-05
1963-06-18
Philco Corp
Improved dual channel amplifier system
NL6816583A
(en)
*
1968-08-23
1970-02-25
JPS5213082B1
(en)
*
1971-07-19
1977-04-12
GB1402320A
(en)
*
1971-10-25
1975-08-06
Sansui Electric Co
Decoder for use in 4-2-4 matrix playback system
US3783192A
(en)
*
1971-12-30
1974-01-01
Sansui Electric Co
Decoder for use in matrix four-channel system
DE2252132C3
(en)
*
1972-10-24
1982-08-26
Sansui Electric Co., Ltd., Tokyo
Decoder for a 4-2-4 matrix system
JPS5317283B2
(en)
1973-03-07
1978-06-07
1973
1973-08-20
JP
JP48093097A
patent/JPS5248001B2/ja
not_active
Expired
1974
1974-08-15
GB
GB3603474A
patent/GB1447814A/en
not_active
Expired
1974-08-16
US
US05/497,959
patent/US3934086A/en
not_active
Expired - Lifetime
1974-08-20
DE
DE2439863A
patent/DE2439863C2/en
not_active
Expired
Also Published As
Publication number
Publication date
JPS5042802A
(en)
1975-04-18
DE2439863A1
(en)
1975-03-06
US3934086A
(en)
1976-01-20
DE2439863C2
(en)
1985-05-15
JPS5248001B2
(en)
1977-12-07
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Legal Events
Date
Code
Title
Description
1977-01-13
PS
Patent sealed [section 19, patents act 1949]
1989-04-05
PCNP
Patent ceased through non-payment of renewal fee
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