Patent US1878879A successfully refreshed from Google Patents.
US4152542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichannel matrix logic and encoding systems
Assignee: Individual
•
Filing: 1977-09-26
•
Granted: 1979-05-01
•
Expires: 1997-09-26
Abstract
Abstract Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.
Inventors
- 👤 Duane P. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:37
CPC Classifications
H; H04; H04S; H04S3/00; H04S3/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
In a matrix decoder for decoding at least two transmission channels having multidirectional source signals encoded therein, to provide at least three loudspeaker presentation signals for different loudspeaker presentation directions, the improvement comprising envelope logic means for generating a modulating signal for each loudspeaker presentation signal which is a function of the degree of correspondence between the loudspeaker presentation direction and envelope logic encoding values, and means for modulating said presentation signals with its respective modulating signal, said envelope logic means comprising means for generating a 90° phase shifted version of each transmission channel, means for generating envelope normalized versions of each transmission channel signal and each of said corresponding phase shifted signals and for determining therefrom at least two signals representing different trigonometric logic values as a function of encoding direction and means for providing from said logic value signals a modulating signal for each speaker presentation signal which is representative of correspondence between the logic signal encoding direction and the respective presentation signal direction.
Claim 2
Dependent Claim
166 words
In a matrix decoder for decoding at least two transmission channels having multidirectional source signals encoded therein, to provide at least three loudspeaker presentation signals for different loudspeaker presentation directions, the improvement comprising envelope logic means for generating a modulating signal for each loudspeaker presentation signal which is a function of the degree of correspondence between the loudspeaker presentation direction and envelope logic encoding values, and means for modulating said presentation signals with its respective modulating signal, said envelope logic means comprising means for generating a 90° phase shifted version of each transmission channel, means for generating envelope normalized versions of each transmission channel signal and each of said corresponding phase shifted signals and for determining therefrom at least two signals representing different trigonometric logic values as a function of encoding direction and means for providing from said logic value signals a modulating signal for each speaker presentation signal which is representative of correspondence between the logic signal encoding direction and the respective presentation signal direction.
Claim 3
Dependent Claim
40 words
A decoder in accordance with claim 1 further including low-pass filter means for filtering said logic value signals such that the logic effect of said modulating signals is disconnected for directional variation of logic value direction at audio band frequencies.
Claim 4
Dependent Claim
140 words
In a UMX decoder comprising means for decoding transmission channels substantially corresponding to T.sub.Σ and T.sub.Δ or linear combinations thereof to provide at least three presentation signals, the improvement comprising means for decoding stereo compatible signals T SL and T SR which are linear combinations of T.sub.Σ and T.sub.Δ which become respectively null at their respective encoding axes of δ° and ( 180-δ) ° , said T SL and T SR signals being defined substantially by: T.sub.SL = 1/2[exp (-jδ ) T.sub.93 - T.sub.Δ ] t.sub.sr = 1/2[exp (jδ)T.sub.Σ + T.sub.Δ ] to provide presentation signals comprising signals P.sub.φ defined substantially by: ##EQU17## where φ is the presentation direction, wherein T.sub.Σ and T.sub.Δ are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU18## in which exp (jθ) designates a leading phase shift.
Claim 5
Dependent Claim
140 words
In a UMX decoder comprising means for decoding transmission channels substantially corresponding to T.sub.Σ and T.sub.Δ or linear combinations thereof to provide at least three presentation signals, the improvement comprising means for decoding stereo compatible signals T SL and T SR which are linear combinations of T.sub.Σ and T.sub.Δ which become respectively null at their respective encoding axes of δ° and ( 180-δ) ° , said T SL and T SR signals being defined substantially by: T.sub.SL = 1/2[exp (-jδ ) T.sub.93 - T.sub.Δ ] t.sub.sr = 1/2[exp (jδ)T.sub.Σ + T.sub.Δ ] to provide presentation signals comprising signals P.sub.φ defined substantially by: ##EQU17## where φ is the presentation direction, wherein T.sub.Σ and T.sub.Δ are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU18## in which exp (jθ) designates a leading phase shift.
Claim 6
Dependent Claim
96 words
A record medium having stereo compatible signals T SL and T SR recorded thereon which are linear combinations of UMX transmission channel signals T.sub.Σ and T.sub.Δ which become respectively null at their respective encoding axes of δ° and (180-δ ) ° , said T SL and T SR signals being defined substantially by: T.sub.SL = 1/2[exp(-jδ)T.sub.Σ - T.sub.Δ ], t sr = 1/2[exp(jΣ)T.sub.Σ + T.sub.Δ ], wherein T.sub.Σ and T.sub.Δ are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU19## in which exp(jθ) designates a leading phase shift.
Claim 7
Dependent Claim
96 words
A record medium having stereo compatible signals T SL and T SR recorded thereon which are linear combinations of UMX transmission channel signals T.sub.Σ and T.sub.Δ which become respectively null at their respective encoding axes of δ° and (180-δ ) ° , said T SL and T SR signals being defined substantially by: T.sub.SL = 1/2[exp(-jδ)T.sub.Σ - T.sub.Δ ], t sr = 1/2[exp(jΣ)T.sub.Σ + T.sub.Δ ], wherein T.sub.Σ and T.sub.Δ are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU19## in which exp(jθ) designates a leading phase shift.
Claim 8
Dependent Claim
141 words
In an apparatus comprising means for encoding multidirectional sound signals of the UMX type to provide a plurality of matrixed transmission channel signals, the improvement comprising means for providing a predominantly left front signal LF, means for providing a predominantly left back signal LB, means for providing a predominantly right front signal RF and means for providing a predominantly right back signal RB, substantially as follows: LF = T.sub.L + M.sub.L, lb = t.sub.l - m.sub.l, rf = t.sub.r + m.sub.r, rb = t.sub.r - m.sub.r, where T.sub. = 1/2(T.sub.Σ -T.sub.Δ), t.sub.r = 1/2(t.sub.Σ + t.sub.Δ), m.sub.l = (1/2j)(T.sub.T + T.sub.Q), m.sub.r = (1/2j)(T.sub.T - T.sub.Q), and where T.sub.Σ T.sub.Δ T T and T Q are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU20## in which exp(jθ) designates a leading phase shift.
Claim 9
Dependent Claim
141 words
In an apparatus comprising means for encoding multidirectional sound signals of the UMX type to provide a plurality of matrixed transmission channel signals, the improvement comprising means for providing a predominantly left front signal LF, means for providing a predominantly left back signal LB, means for providing a predominantly right front signal RF and means for providing a predominantly right back signal RB, substantially as follows: LF = T.sub.L + M.sub.L, lb = t.sub.l - m.sub.l, rf = t.sub.r + m.sub.r, rb = t.sub.r - m.sub.r, where T.sub. = 1/2(T.sub.Σ -T.sub.Δ), t.sub.r = 1/2(t.sub.Σ + t.sub.Δ), m.sub.l = (1/2j)(T.sub.T + T.sub.Q), m.sub.r = (1/2j)(T.sub.T - T.sub.Q), and where T.sub.Σ T.sub.Δ T T and T Q are formed from a plurality of multidirectional source signals S from respective encoding directions θ, substantially as: ##EQU20## in which exp(jθ) designates a leading phase shift.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |