US3784744A - Decoders for quadruphonic sound utilizing wave matching logic - Google Patents
Decoders for quadruphonic sound utilizing wave matching logic Download PDFInfo
- Publication number
- US3784744A US3784744A US00118271A US3784744DA US3784744A US 3784744 A US3784744 A US 3784744A US 00118271 A US00118271 A US 00118271A US 3784744D A US3784744D A US 3784744DA US 3784744 A US3784744 A US 3784744A
- Authority
- US
- United States
- Prior art keywords
- signals
- phase
- signal
- composite signals
- composite
- 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 - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00992—Circuits for stereophonic or quadraphonic recording or reproducing
-
- 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
Definitions
- Each of the gain control amplifiers 1106 has a control electrode 118, 120, 122 and 124, respectively, application of a control voltage to which varies the gain of the amplifier.
- the gain control amplifiers may embody a variable gain vacuum tube, a suitable variable gain transistor, or any suitable vario-losser circuit, or other well known technique for providing variable gain in response to an applied voltage.
- the control voltage E, from subtractor circuit 82 is applied in parallel to control terminals 118 and 1124 of amplifiers 100 and 106, respectively, to control the gains of the front loudspeakers, and the control signal E is applied in parallel to the control electrodes 120 and 1122 to control the amplification of signals applied to respective back loudspeakers.
- decoder apparatus adapted to receive first and second composite signals L and R respectively containing dominant signals L; and R, and each including two sub-dominant signal components L, and R said signal component L, being of substantially equal magnitude and in substantially quadrature relationship in said first and second composite signals, and in one of said first and second composite signals in leading relationship with that in the other, and said signal component R, being of substantially equal magnitude and in substantially quadrature relationship in said first and second composite signals, and in said one of said first and second signals in lagging relationship with that in the other, and including at least two phase-shifting networks operative to shift the phase of one of said first and second composite signals relative to the other by substantially 9ll to cause the signal components L and R in one of said relatively phaseshifted composite signals to be in phase coincidence or in phase opposition with corresponding signal components in the other relatively phaseshifted composite signal, combining networks operative to derive from said relatively phase-shifted composite signals third and fourth composite sig nals respectively containing dominant signal components L and R and each including two subdom inant signal components L; and R said
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Mathematical Physics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- General Physics & Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Acoustics & Sound (AREA)
- Algebra (AREA)
- Stereophonic System (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11827171A | 1971-02-24 | 1971-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3784744A true US3784744A (en) | 1974-01-08 |
Family
ID=22377557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00118271A Expired - Lifetime US3784744A (en) | 1971-02-24 | 1971-02-24 | Decoders for quadruphonic sound utilizing wave matching logic |
Country Status (11)
Country | Link |
---|---|
US (1) | US3784744A (de) |
JP (1) | JPS5240561B1 (de) |
AU (1) | AU460098B2 (de) |
BE (1) | BE777215A (de) |
CA (1) | CA981589A (de) |
DE (1) | DE2208099C3 (de) |
FR (1) | FR2126176B1 (de) |
GB (2) | GB1387873A (de) |
IL (1) | IL38130A (de) |
IT (1) | IT948394B (de) |
NL (1) | NL7115538A (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3883692A (en) * | 1972-06-16 | 1975-05-13 | Sony Corp | Decoder apparatus with logic circuit for use with a four channel stereo |
DE2456376A1 (de) * | 1973-11-29 | 1975-06-05 | Sony Corp | Decodierer zum wiedergeben von vier getrennten informationssignalen |
US3911222A (en) * | 1970-12-09 | 1975-10-07 | Kenwood Corp | Method and a device for producing a 4-channel stereophonic sound field |
DE3607610A1 (de) * | 1985-03-07 | 1986-09-18 | Dolby Laboratories Licensing Corp., San Francisco, Calif. | Decoder |
US5046098A (en) * | 1985-03-07 | 1991-09-03 | Dolby Laboratories Licensing Corporation | Variable matrix decoder with three output channels |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632886A (en) * | 1969-12-29 | 1972-01-04 | Peter Scheiber | Quadrasonic sound system |
US3708631A (en) * | 1970-06-08 | 1973-01-02 | Columbia Broadcasting Syst Inc | Quadraphonic reproducing system with gain control |
-
1971
- 1971-02-24 US US00118271A patent/US3784744A/en not_active Expired - Lifetime
- 1971-11-08 CA CA127,101A patent/CA981589A/en not_active Expired
- 1971-11-11 IL IL38130A patent/IL38130A/xx unknown
- 1971-11-11 NL NL7115538A patent/NL7115538A/xx not_active Application Discontinuation
- 1971-12-20 AU AU37107/71A patent/AU460098B2/en not_active Expired
- 1971-12-23 FR FR7146313A patent/FR2126176B1/fr not_active Expired
- 1971-12-23 BE BE777215A patent/BE777215A/xx unknown
-
1972
- 1972-01-17 JP JP47006291A patent/JPS5240561B1/ja active Pending
- 1972-02-01 IT IT48082/72A patent/IT948394B/it active
- 1972-02-11 GB GB658072A patent/GB1387873A/en not_active Expired
- 1972-02-11 GB GB658172A patent/GB1379771A/en not_active Expired
- 1972-02-21 DE DE722208099A patent/DE2208099C3/de not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3632886A (en) * | 1969-12-29 | 1972-01-04 | Peter Scheiber | Quadrasonic sound system |
US3708631A (en) * | 1970-06-08 | 1973-01-02 | Columbia Broadcasting Syst Inc | Quadraphonic reproducing system with gain control |
Non-Patent Citations (1)
Title |
---|
4 Channels and Compatibility by Schiebes Audio Engineering Society Preprint Oct. 12 15, 1970. * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3911222A (en) * | 1970-12-09 | 1975-10-07 | Kenwood Corp | Method and a device for producing a 4-channel stereophonic sound field |
US3883692A (en) * | 1972-06-16 | 1975-05-13 | Sony Corp | Decoder apparatus with logic circuit for use with a four channel stereo |
DE2456376A1 (de) * | 1973-11-29 | 1975-06-05 | Sony Corp | Decodierer zum wiedergeben von vier getrennten informationssignalen |
DE3607610A1 (de) * | 1985-03-07 | 1986-09-18 | Dolby Laboratories Licensing Corp., San Francisco, Calif. | Decoder |
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 |
Also Published As
Publication number | Publication date |
---|---|
IL38130A (en) | 1974-09-10 |
NL7115538A (de) | 1972-08-28 |
DE2208099A1 (de) | 1972-09-07 |
FR2126176B1 (de) | 1976-04-30 |
AU3710771A (en) | 1973-06-28 |
GB1387873A (en) | 1975-03-19 |
DE2208099B2 (de) | 1978-07-06 |
FR2126176A1 (de) | 1972-10-06 |
AU460098B2 (en) | 1975-04-17 |
CA981589A (en) | 1976-01-13 |
IT948394B (it) | 1973-05-30 |
IL38130A0 (en) | 1972-01-27 |
GB1379771A (en) | 1975-01-08 |
JPS5240561B1 (de) | 1977-10-13 |
DE2208099C3 (de) | 1979-03-01 |
BE777215A (fr) | 1972-06-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CBS RECORDS, INC., 51 WEST 52ND STREET, NEW YORK, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CBS INC.;REEL/FRAME:004809/0935 Effective date: 19871130 |