GB1476772A - Creation of Inventions and Patents with Artificial Intelligence

GB1476772A – Decoding apparatus for reproducing four separate audio information signals
– Google Patents

GB1476772A – Decoding apparatus for reproducing four separate audio information signals
– Google Patents
Decoding apparatus for reproducing four separate audio information signals

Info

Publication number
GB1476772A

GB1476772A
GB5142074A
GB5142074A
GB1476772A
GB 1476772 A
GB1476772 A
GB 1476772A
GB 5142074 A
GB5142074 A
GB 5142074A
GB 5142074 A
GB5142074 A
GB 5142074A
GB 1476772 A
GB1476772 A
GB 1476772A
Authority
GB
United Kingdom
Prior art keywords
signals
delay
output
difference
matrix
Prior art date
1973-11-29
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
GB5142074A
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.)

Sony Corp

Original Assignee
Sony Corp
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.)
1973-11-29
Filing date
1974-11-27
Publication date
1977-06-16

1974-11-27
Application filed by Sony Corp
filed
Critical
Sony Corp

1977-06-16
Publication of GB1476772A
publication
Critical
patent/GB1476772A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

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

1476772 Quadraphonic matrix decoders SONY CORP 27 Nov 1974 [29 Nov 1973] 51420/74 Heading H4R In a matrix quadraphonic decoder in which two input signals each containing at least three out of four information signals are decoded to produce four output signals each containing a respective predominant signal and a different pair of subdominant signals, the magnitudes of at least two of the output signals are compared to develop a control signal which is used to vary the time delay of variable delay circuits in the output channels. By providing differential delay in the output signals a sound is localized to the position of the source from which it is first heard. As shown in Fig. 2 an SQ matrix circuit 34 produces four output signals LF1, RF1, LB1, and RB1 which are applied via respective delay circuits, formed by charge transfer devices, to the output transducers 131, 132, 133, 134. In addition the matrix circuit outputs are fed through gain control amplifiers 70, 72, 74, 76, full wave rectified, and the LF1 and RF1 signals are compared and the difference signal fed to a clipping or slicing circuit 96 which provides an output if the difference between the LF1 and RF1 signals exceeds a predetermined amount. Similarly the LB1 and RB1 signals are compared and a slicing circuit 98 provides an output if the difference exceeds a predetermined amount. The slicing circuits outputs are fed to respective inputs of a differential amplifier 94 having opposite polarity outputs which are used to control the frequency of oscillators 108 and 109 driving clock generators 110 and 111 which control the stepping of the charge transfer delay devices to differentially vary the delay in the LF1 and FR1 channels relative the delay in the LB1 and RB1 channels. The arrangement is such that if front signals predominate LB1 and RB1 both contain cross talk components LF and RF together with the respective predominant LB and RB components the difference between LB1 and RB1 will therefore be low while the difference between LF1 and RF1 would be finite and a positive output would occur at 106 on the logic circuit output and this would reduce the delay given to the LF1 and RF1 signals and increase the delay given to the LB1 and RB1 signals. With back signals predominanting the cross talk components LB and RB in both the front signals LF1 and RF1 would make the difference between LF1 and BF1 low, # LB1 | – | RB1 # would be finite, and the delays on LB1 and RB1 would be reduced and on LF1 and RF1 they would be increased. In a modification, Fig. 5 (not shown), the outputs from differential amplifier 94 are used to control the gain of amplifiers (142, 143, 144, and 145) interposed between the variable delays 117, 118, 119, 120, and the transducers 131, 132, 133, 134, and differentiating circuits (146, 147) are provided in the feed to the variable frequency oscillators 108 and 109 so that the variable delay is only implemented at the commencement of a sound. It is also suggested that the arrangement could be applied to an RM (regular matrix) system by comparing LF1 and KB1 signals and BF1 and LB1 signals and delaying one pair relative the other.

GB5142074A
1973-11-29
1974-11-27
Decoding apparatus for reproducing four separate audio information signals

Expired

GB1476772A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

JP13419873A

JPS5645358B2
(en)

1973-11-29
1973-11-29

Publications (1)

Publication Number
Publication Date

GB1476772A
true

GB1476772A
(en)

1977-06-16

Family
ID=15122712
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB5142074A
Expired

GB1476772A
(en)

1973-11-29
1974-11-27
Decoding apparatus for reproducing four separate audio information signals

Country Status (8)

Country
Link

US
(1)

US3919480A
(en)

JP
(1)

JPS5645358B2
(en)

CA
(1)

CA1002880A
(en)

DE
(1)

DE2456376C2
(en)

FR
(1)

FR2253331B1
(en)

GB
(1)

GB1476772A
(en)

IT
(1)

IT1026687B
(en)

NL
(1)

NL7415427A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2154835A
(en)

1984-02-21
1985-09-11
Kintek Inc
Signal decoding system

Families Citing this family (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4018992A
(en)

1975-09-25
1977-04-19
Clifford H. Moulton
Decoder for quadraphonic playback

GB1552478A
(en)

1977-11-21
1979-09-12
Nat Res Dev
Sound reproduction systems

JPS5822355Y2
(en)

1978-11-29
1983-05-13
ソニー株式会社

Audio multiplex signal playback device

US4303800A
(en)

1979-05-24
1981-12-01
Analog And Digital Systems, Inc.
Reproducing multichannel sound

Family Cites Families (5)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3806667A
(en)

1970-12-31
1974-04-23
Victor Company Of Japan
Four channel phonograph multiplex recording system with signal level control

US3784744A
(en)

1971-02-24
1974-01-08
Columbia Broadcasting Syst Inc
Decoders for quadruphonic sound utilizing wave matching logic

US3821471A
(en)

1971-03-15
1974-06-28
Cbs Inc
Apparatus for reproducing quadraphonic sound

NL172815B
(en)

1971-04-13

Sony Corp

MULTIPLE SOUND DISPLAY DEVICE.

GB1398786A
(en)

1971-08-06
1975-06-25
Sony Corp
Multisignal transmission apparatus

1973

1973-11-29
JP
JP13419873A
patent/JPS5645358B2/ja
not_active
Expired

1974

1974-11-22
US
US526333A
patent/US3919480A/en
not_active
Expired – Lifetime

1974-11-26
NL
NL7415427A
patent/NL7415427A/en
not_active
Application Discontinuation

1974-11-27
GB
GB5142074A
patent/GB1476772A/en
not_active
Expired

1974-11-28
CA
CA214,860A
patent/CA1002880A/en
not_active
Expired

1974-11-28
DE
DE2456376A
patent/DE2456376C2/en
not_active
Expired

1974-11-29
FR
FR7439258A
patent/FR2253331B1/fr
not_active
Expired

1974-11-29
IT
IT30048/74A
patent/IT1026687B/en
active

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2154835A
(en)

1984-02-21
1985-09-11
Kintek Inc
Signal decoding system

Also Published As

Publication number
Publication date

FR2253331A1
(en)

1975-06-27

FR2253331B1
(en)

1980-07-25

DE2456376C2
(en)

1984-10-31

JPS5645358B2
(en)

1981-10-26

CA1002880A
(en)

1977-01-04

US3919480A
(en)

1975-11-11

DE2456376A1
(en)

1975-06-05

JPS5086302A
(en)

1975-07-11

IT1026687B
(en)

1978-10-20

NL7415427A
(en)

1975-06-02

Contact information