EP0875126A1 - Processeur d'ambiophonie comportant un generateur ameliore de tension de commande - Google Patents

Processeur d'ambiophonie comportant un generateur ameliore de tension de commande

Info

Publication number
EP0875126A1
EP0875126A1 EP95944242A EP95944242A EP0875126A1 EP 0875126 A1 EP0875126 A1 EP 0875126A1 EP 95944242 A EP95944242 A EP 95944242A EP 95944242 A EP95944242 A EP 95944242A EP 0875126 A1 EP0875126 A1 EP 0875126A1
Authority
EP
European Patent Office
Prior art keywords
signals
signal
output
voltage
nght
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.)
Granted
Application number
EP95944242A
Other languages
German (de)
English (en)
Other versions
EP0875126B1 (fr
EP0875126A4 (fr
Inventor
James W. Fosgate
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.)
Harman International Industries Inc
Original Assignee
Harman International Industries 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 Harman International Industries Inc filed Critical Harman International Industries Inc
Priority claimed from PCT/US1995/016897 external-priority patent/WO1997024012A1/fr
Publication of EP0875126A1 publication Critical patent/EP0875126A1/fr
Publication of EP0875126A4 publication Critical patent/EP0875126A4/fr
Application granted granted Critical
Publication of EP0875126B1 publication Critical patent/EP0875126B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Definitions

  • FIG. 1 a conventional representation of the amplitude and phase relationships between the left and right channels of a stereophomc signal pair, called the Scheiber sphere (after Peter Scheiber) or energy sphere (this term is due to M. A. Gerzon), which relates the relative amplitudes, or amplitude ratio, of the left and right channels to an angle ⁇ and the phase angle between the signals to another angle ⁇ .
  • These correspond to spherical polar coordinates of a sphere in which the polar axis runs from left to nght in the horizontal plane, and the "longitude” represents the ratio between nght and left signals, while the "latitude” represents the phase angle.
  • sinusoidal signals /, r of any frequency, and having amplitudes L, R respectively,
  • An improved filter circuit for the BKF rectifier comprises the resistors R405 and R409 and capacitors C401, C403 and C405.
  • Resistor R407 provides forward bias current for the diodes D405, D406.
  • An exactly similar circuit is provided for the FTF rectifier, comprising resistors R406, R410, capacitors
  • resistor R408 provides bias current for diodes D407 and D408.
  • the two filter outputs are combined by resistors R411 and R412 into the virtual ground inverting input of op-amp OA405, which has a feedback resistor R414 and capacitor C407, and employs two zener diodes D409 and D410 connected back to back and in senes to provide symmet ⁇ cal limiting of the control signal generated by the rectifiers
  • Resistor R413 and t ⁇ mpot R415 provide adjustable offset compensation to op-amp OA405, whose output at terminal 104 is the F/B detector output signal This signal goes positive for signals having predominantly antiphase or back information, and negative for signals having predominantly in-phase or front information content
  • Resistors R810 and R809 respectively from the FT/BK signal and its inverted filtered version at the output of op-amp U802, and resistor R811 from the output of the half-wave rectifier U805, are connected to a common virtual ground summing junction at the inverting input of op-amp U816.
  • the resultant current from these three resistors is the full-wave rectified or absolute value of the difference signal between FT/BK and its filtered version at U801, applied via an effective resistance in this case of 20k ⁇ , the value of resistor R810.
  • FT k ⁇ (0.5 LT + 0.5 RT)
  • LB k Lli (0.8676 LT - 0.2875 RT)
  • RF k HF RT
  • the feedback resistor R1011 is adjustable to yield a maximum gain for any input of -0.912. Typically the potentiometer will, however, be set back to give a gain of 0 707 or -3dB for the largest input, to avoid any possibility of overloading
  • the resistor R1012 and capacitor C1001 are provided to a c couple the op-amp and provide 100% d c negative feedback around it to minimize its output offset voltage
  • the summing resistors R1001 through R1009 are chosen to provide specific mat ⁇ xmg coefficients, relative to the value of 27 4k ⁇ which results in a coefficient of 1 000 These coefficient values are shown to the right of the respective resistors
  • the input terminals of the circuit are labeled with the signals they receive, either the LT, RT, -LT or -RT signals 3 from the input mat ⁇ x 6 of FIG.
  • the LB matrix portion of matnx 30 has nine resistors R1034 through R1042 defining the coefficients shown to their right, and the combined signal may also be switched via a delav circuit 138 in some modes of operation by means of switches S1003 and S1004 controlled by the DELAY IN/OUT signal applied to terminal 136
  • the LB buffer 38 compnses op-amp U1004 with resistors R1043 through R1045 and capacitors C1004 and C1005. It is essentially the same as the previously descnbed buffers, with the exception that a shelf filter is created by the additional feedback components C1004 and R1043 shown. This has the effect of reducing the high frequency gain by about 5 - 6 dB which can be effective in reducing sibilant "splash" from center front dialog, especially in movie soundtracks.
  • the equation for the output signal LBO appearing at terminal 48 is:
  • the results may be tabulated for each of the p ⁇ ncipal sound source directions.
  • the first two columns give the values of LT and RT, and the remaining columns represent the output signals, for each of the input directions listed at the left In the first mode of operation of FIG. 6, i.e with switch S505 in the first position as shown, and with the VCA's in the first configuration of FIG.

Abstract

Processeur d'ambiophonie servant à diffuser un signal audio stéréophonique sur plusieurs enceintes acoustiques entourant une zone d'écoute, et comprenant un étage matriciel d'entrée (6), un filtre détecteur (8) et un circuit matriciel (10), un circuit détecteur de direction incorporant des filtres améliorés, un nouveau circuit répartiteur détecteur (14) produisant trois signaux de direction depuis les deux sorties du circuit détecteur de direction, un nouveau circuit servologique à trois canaux (16) comportant des filtres variables améliorés réagissant sélectivement aux vitesses de changement des signaux de direction et produisant six signaux de commande de tension (17) par l'intermédiaire de réseaux de correction de linéarité vers six amplificateurs commandés en tension (18, 20, 22, 24, 26, 28), dont les sorties sont combinées dans une matrice de sortie (30), de manière à produire plusieurs signaux alimentant les enceintes acoustiques par l'intermédiaire d'amplificateurs tampon (32, 34, 36, 38, 40) vers les bornes de sortie du processeur. Le circuit répartiteur détecteur (14) peut être configuré en un mode de fonctionnement orienté soit vers l'avant, soit vers l'arrière, les modifications correspondantes étant effectuées sur les amplificateurs commandés en tension (18, 20, 22, 24, 26, 28) et sur le circuit matriciel de sortie (30). De plus, le répartiteur détecteur (14) peut être commuté afin d'éliminer le troisième signal de direction, tout en apportant les modifications correspondantes au circuit matriciel de sortie (30).
EP95944242A 1995-12-21 1995-12-21 Processeur d'ambiophonie comportant un generateur ameliore de tension de commande Expired - Lifetime EP0875126B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1995/016897 WO1997024012A1 (fr) 1990-06-08 1995-12-21 Processeur d'ambiophonie comportant un generateur ameliore de tension de commande

Publications (3)

Publication Number Publication Date
EP0875126A1 true EP0875126A1 (fr) 1998-11-04
EP0875126A4 EP0875126A4 (fr) 2003-05-07
EP0875126B1 EP0875126B1 (fr) 2004-10-27

Family

ID=22250377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95944242A Expired - Lifetime EP0875126B1 (fr) 1995-12-21 1995-12-21 Processeur d'ambiophonie comportant un generateur ameliore de tension de commande

Country Status (4)

Country Link
EP (1) EP0875126B1 (fr)
JP (1) JP3588624B2 (fr)
AT (1) ATE281053T1 (fr)
DE (1) DE69533706T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4624643B2 (ja) * 2000-08-31 2011-02-02 ドルビー・ラボラトリーズ・ライセンシング・コーポレーション オーディオ・マトリックス・デコーディング装置に関する方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941177A (en) * 1985-03-07 1990-07-10 Dolby Laboratories Licensing Corporation Variable matrix decoder
US5295189A (en) * 1990-06-08 1994-03-15 Fosgate James W Control voltage generator for surround sound processor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941177A (en) * 1985-03-07 1990-07-10 Dolby Laboratories Licensing Corporation Variable matrix decoder
US5295189A (en) * 1990-06-08 1994-03-15 Fosgate James W Control voltage generator for surround sound processor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9724012A1 *

Also Published As

Publication number Publication date
DE69533706D1 (de) 2004-12-02
ATE281053T1 (de) 2004-11-15
JP3588624B2 (ja) 2004-11-17
DE69533706T2 (de) 2005-04-14
EP0875126B1 (fr) 2004-10-27
JP2000502850A (ja) 2000-03-07
EP0875126A4 (fr) 2003-05-07

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