EP0776144B1 - Circuit pour la modification d'un signal - Google Patents

Circuit pour la modification d'un signal Download PDF

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Publication number
EP0776144B1
EP0776144B1 EP95118595A EP95118595A EP0776144B1 EP 0776144 B1 EP0776144 B1 EP 0776144B1 EP 95118595 A EP95118595 A EP 95118595A EP 95118595 A EP95118595 A EP 95118595A EP 0776144 B1 EP0776144 B1 EP 0776144B1
Authority
EP
European Patent Office
Prior art keywords
signal
signals
circuit
weighting
signal component
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
Application number
EP95118595A
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German (de)
English (en)
Other versions
EP0776144A1 (fr
Inventor
Martin Dipl.-Phys. Winterer
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.)
TDK Micronas GmbH
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TDK Micronas GmbH
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 TDK Micronas GmbH filed Critical TDK Micronas GmbH
Priority to DE59509187T priority Critical patent/DE59509187D1/de
Priority to EP95118595A priority patent/EP0776144B1/fr
Priority to JP8311836A priority patent/JPH09191499A/ja
Priority to US08/754,144 priority patent/US5822437A/en
Priority to KR1019960056382A priority patent/KR100424520B1/ko
Publication of EP0776144A1 publication Critical patent/EP0776144A1/fr
Application granted granted Critical
Publication of EP0776144B1 publication Critical patent/EP0776144B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution

Definitions

  • the invention relates to an electronic circuit for modifying a first and second signal, which are either available individually or in connection with other signals are available.
  • Such circuits are known to have certain effects of to amplify or weaken information contained in the signals.
  • On The application is, for example, a contour amplifier for signals with optical Signals are linked and by a raster scan or by a variety are formed by sensors.
  • For signals that are linked to sound waves there is Similar applications ranging from very low frequencies to far into the ultrasound range reach into it. With these signals, seismic signals can, too high-frequency signals in the ultrasonic range, such as in the Material testing are used. The is included normal audio area dealing with audible signals.
  • the modification circuit is based on stereo signals according to one of the standardized stereo coding methods, which a left and a right signal in coded form as sum and Transfer differential signal.
  • the modification circuits electronically change the so-called stereo base, which makes the two the effect of the associated loudspeakers as it were.
  • the change effects can also affect more elaborate playback systems with more than two speakers and / or more than two signals related to a surround sound convey that can be changed by the modification circuit.
  • US 5,420,929 is the closest prior art to a signal modification circuit described for stereo signals. From a left and a right signal the direction-independent lowers are reduced with the help of filters Frequency components and the possibly direction-dependent higher ones Frequency components separated, the direction-independent or directional signal components as "coherent” or “non-coherent” Signal components are referred to. To avoid an “acoustic Loches "in the middle between two speakers that are relatively far apart From about 300 Hz, the filtered signals become pseudo-coherence signals formed, the two speakers additive to the existing signal components are supplied and thus a larger mono signal component to pretend. This can hide the "acoustic hole" in the middle.
  • the pseudo-coherence signals are formed by means of delay stages in the Signal paths for signal ranges above 300 Hz Delay stages take the resulting phase of the delayed signals with them increasing signal frequency steeply, so that frequency ranges with Multiple phases of +/- 180 ° and 360 ° and the intermediate areas each other alternate. Due to the steep phase response, the coherence and the Non-coherence property of the respective signal components for dense successive frequency ranges of the signal as it were "blurred" and thereby ineffective for the directional location.
  • the object of the invention is a circuit arrangement for modification specify at least two signals that simply match the respective signal properties can be adjusted.
  • each circuit shows an input for a left signal L and another input for a Right signal R on. Accordingly, each modification circuit has an output for a modified left signal L 'and another output a modified Right signal R 'on.
  • Each circuit also includes first and second Combination device Kl, K2, in which different signal components with each other be combined, usually added or subtracted, to finally the modified To form output signal L 'or R'. These modified signals are then each fed at least one speaker, not shown, these not too tight may stand side by side.
  • the individual modification circuits are used to Magnification of the stereo base increases the differences in the individual signals and in contrast, the common signal component is reduced.
  • the common signal component is usually referred to as a mono signal and the difference as a difference signal.
  • these two components play in the transmission of the stereo multiplex signal an essential role.
  • the mono component in itself sounds good. The However, the difference is not attributable to an actual audible signal and sounds alone very uncomfortable.
  • Filter circuits are included in all of the circuits of FIGS. 1 to 5.
  • audio signals can be assumed that the lower ones are usually Frequency components up to a few 100 Hz are available as mono signals and Directional dependency only affects the overlying frequency components.
  • the individual signal components that the legal and Affect the left signal are thus high-pass filtered signals, so that the in Filter circuits operating in the forward direction are realized by high-pass filters HP.
  • the respective contribution of the individual signal components to the modification is by Multiplier M and weighting factors controlled, the negative, the positive and the Amount after may be greater than 1.
  • the aim is that the frequency response should be as possible after the modification stays straight because otherwise the sound will be distorted.
  • the volume impression should not changed overall.
  • the directional impression is amplified by subtracting part of the first and second signals L and R, which is determined by the weighting factor k and a high-pass filter HP, from the other signal R and L, respectively becomes.
  • the frequency diagram on the left shows that this modification is ideal if either only a first signal L or only a second signal R is present.
  • a differential signal L-R is finally formed from the first and second signals L and R by means of a subtractor sb and a signal component is formed therefrom by means of a high-pass filter HP and a weighting stage M, which component adds to the first signal L. and subtracted from the second signal R.
  • the difference between the first and second signals is increased by the addition and subtraction of the difference value, so that the modified signals L ' , R ' have an amplified directional effect at the output and thus enlarge the stereo base.
  • the invention teaches that a general circuit with which all variants can be realized can be accomplished by including further signal components in the respective modification, the influence of which is controlled by associated weighting factors.
  • the individual signal components are also combined by means of combination devices, ie added or subtracted, in order finally to obtain a modified first and second signal L ' or R ' again.
  • each modified signal by three signal components is formed.
  • each signal component should individually by means of a filter circuit and a weighting factor can be changed.
  • the exemplary embodiment according to FIG. 4 already provides one Simplification is because two signal components s2, s3 and s5, s6 have only one Filter circuit F2 or F4 are performed.
  • a signal source q delivers a first and a second signal L, R at its output Signal source q is not specified, it can also be, for example Represent multiple signal source with parallel outputs, the first and second Signal is to be assigned to neighboring signals.
  • the exemplary embodiments are limited to stereo signals, the first signal L a left signal and the second signal R corresponds to a right signal.
  • signal source q contains a decoder for stereo multiplex signals.
  • the first signal L is fed to an input of a first combination device K1 by means of a first filter F1 and a first weighting device with a multiplier M1 as the first signal component s1.
  • the associated weighting factor g is supplied to the first multiplier M1 as a data value or corresponds to a fixed position shift.
  • the first signal L is also fed to the input of a second filter F2 and forms, by means of a second weighting device, a sixth signal component s6 which is fed to a second combination device K2, at the output of which the second modified signal R 'can be tapped.
  • the weighting in the second weighting device effects a second multiplier M2, the weighting input of which is supplied with a second weighting factor k.
  • the signal is passed through a third weighting device and reaches the first combination device K1 as second signal component s2.
  • the weighting in the third weighting device effects a third multiplier M3, the weighting input of which is supplied with a third weighting factor ⁇ .
  • a fourth, fifth and third signal component s4, s5, s3 are formed from the second signal R.
  • a third or fourth filter F3, F4 corresponds to the first or the second filter F1, F2.
  • the first, second and third multipliers M1, M2, M3 correspond to a fourth, fifth and a sixth multiplier M4, M5, M6, to which the first, second and third weighting factors g, k and ⁇ are supplied.
  • the third and sixth signal components s3, s6 are routed to a subtrahead input of the first and second combination devices K1, K2. The subtrahend inputs can be avoided if the associated weighting factors are changed in the sign.
  • FIG. 5 shows another embodiment of the invention, the circuit of Fig. 4 in a simplified form.
  • the circuit also contains Control devices, b1, b2, r and control devices st for regulation and / or specification the weighting factors.
  • the embodiment of the circuit of FIG. 5 is still geared more towards processing audio signals than the more general one Circuit of Fig.4.
  • the signal source q delivers L, R as first and second signals Left and right signal.
  • the first and fourth signal components s1, s4 are neither filtered or weighted but correspond directly to the first and second signal L or R.
  • Using a high pass filter HP and weighting by the second Weighting factor k becomes the sixth signal component s6 from the first signal L. formed, which is fed to the subtrahend of the second combination device K2 is.
  • a weighting factor ⁇ which is approximately between 0.4 and 0, 5
  • a frequency response is set which corresponds to the frequency response of FIG. 2 corresponds and is optimal for mixed signals.
  • the third Weighting factor ⁇ also be negative to increase the signal for unspecific signals to reduce in the upper frequency range.
  • the third weighting factor ⁇ can be set in different ways. Either as a fixed value via the control device st - in FIG. 5 this is by a Dashed connection shown.
  • the third weighting factor ⁇ can also are adaptively controlled by the signal properties themselves, for example by means of a first evaluation device b1 determined from the left and right signals L, R. become. In the simplest case, the mono or Difference signal component determined. Using individual filters with which the Individuals can reproduce physiological hearing sensitivity Frequency ranges are treated separately or specially weighted. This matches with an adaptive control of the weighting factor ⁇ , which is shown by the dashed line in FIG Line at the output of the first evaluation device b1 is shown schematically.
  • the outputs of the first and second evaluation devices b1, b2 can be connected to a control device r, the output of which controls the level of the weighting factors.
  • the control device r can be used, in particular, to ensure that the volume impression does not change during the modification, regardless of the respective effect control. If the control device r is to take into account the volume impression in the entire frequency range or in individual frequency ranges, then the first and second evaluation devices b1, b2 must determine, among other things, performance-related data from the signals at the input and output of the modification circuit. In the exemplary embodiment of FIG. 5, the output of the control device r controls the third weighting factor ⁇ .

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Claims (8)

  1. Circuit destiné à la modification d'un premier et d'un deuxième signal (L et R) qui sont fournis par une source de signaux (q) et comportant des dispositifs (F1 à F, M1 à M6) qui comprennent des filtres (F1 àF4) et des dispositifs de pondération (M1 à M6) destinés à la formation d'une première à une sixième composantes de signal (s1 à s6) à partir du premier et du deuxième signal (L et R), dans lequel les composantes de signal séparent les premier et deuxième signaux (L et R) essentiellement en parties de signal communes initialement et différentes initialement qui sont combinées au moyen d'un premier et d'un deuxième dispositif de combinaison (K1 et K2), selon une pondération respective pour fournir un premier et un deuxième signal modifiés (L' et R'),
    dans lequel la première et la deuxième (s1, s2) composante de signal couplées au premier signal (L) et la troisième composante de signal (s3) couplée au deuxième signal (R) sont couplées au moyen du premier dispositif de combinaison (K1) dont la sortie fournit le premier signal modifié (L'),
    dans lequel la quatrième et la cinquième (s4, s5) composantes de signal couplées au deuxième signal (R) et la sixième composante de signal (s6) couplée au premier signal (L) sont couplées au moyen du deuxième dispositif de combinaison (K2) dont la sortie fournit le deuxième signal modifié (R')
    caractérisé en ce que :
       au moins une des composantes de signal (s1 à s6) est inversée dans son ensemble dans son action concernant la propriété initiale du signal sur le premier ou le deuxième signal modifiés (L', R') du fait que soit l'un ou l'autre des premier et deuxième dispositifs de combinaison (K1, K2) destinés à cette au moins une composante de signal (s1 à s6) comprend une entrée de signal négative, soit le dispositif de pondération correspondant (M1 à M6) destinés à cette au moins une composante de signal (s1 à s6) comprend une entrée de signal négative ou une entrée de pondération négative.
  2. Circuit selon la revendication 1, caractérisé par les caractéristiques suivantes :
    la première composante de signal (s1) est formée à partir du premier signal (L) au moyen d'un premier filtre (F1) et d'un premier multiplicateur (M1) qui réalise un premier facteur de pondération (g),
    la sixième composante de signal (s6) est formée à partir du premier signal (L) au moyen d'un deuxième filtre (F1) et d'un deuxième multiplicateur (M2) qui réalise un deuxième facteur de pondération (k),
    la quatrième composante de signal (s4) est formée à partir du deuxième signal (R) au moyen d'un troisième filtre (F3) et d'un quatrième multiplicateur (M4) qui réalise le premier facteur de pondération (g),
    la troisième composante de signal (s1) est formée à partir du deuxième signal (R) au moyen d'un premier quatrième (F4) et d'un cinquième multiplicateur (M5) qui réalise le deuxième facteur de pondération (k),
    la deuxième composante de signal (s2) est formée à partir de la sixième composante de signal (s6) au moyen d'un troisième multiplicateur (M3) qui réalise un troisième facteur de pondération (α),
    la cinquième composante de -signal (s5) est formée à partir de la troisième composante de signal (s3) au moyen d'un sixième multiplicateur (M6) qui réalise le troisième facteur de pondération (α), et
    chacune des valeurs des facteurs de pondération (g, k, α) est fournie au moyen d'un dispositif de commande (st) ou est dépendante de dispositifs d'évaluation (b1, b2).
  3. Circuit selon la revendication 1 ou 2, caractérisé en ce que, au moyen d'un premier dispositif d'évaluation (b1), auquel on envoie les premier et deuxième signaux (L, R), on commande au moins un des facteurs de pondération (g, k, α).
  4. Circuit selon la revendication 1 ou 2, caractérisé en ce que l'on envoie, à un premier circuit d'évaluation (b1), le premier et le deuxième signal (L, R) et, à un deuxième circuit d'évaluation (b2), les premier et deuxième signaux modifiés (L', R') et en ce qu'il comporte un dispositif de réglage (r), qui est couplé avec le premier et le deuxième dispositif d'évaluation (b1, b2) et est conformé de telle manière qu'il commande au moins un des facteurs de pondération (g, k, α).
  5. Circuit selon la revendication 2, caractérisé en ce que chacun des deuxième et quatrième filtres (F2, F4) est un filtre passe-haut et en ce que, au moyen du deuxième facteur de pondération (k) des deuxième et cinquième multiplicateurs, on peut modifier chaque effet vidéo.
  6. Circuit selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la première composante de signal (s1) correspond au premier signal (L) et la quatrième composante de signal (s4) correspond au deuxième signal (R).
  7. Circuit selon la revendication 4, caractérisé en ce que le dispositif de réglage (r) est conformé de telle manière qu'il agit sur la valeur du troisième facteur de pondération (α).
  8. Circuit selon la revendication 4 ou 7, caractérisé en ce que, dans les dispositifs d'évaluation (b1, b2), on détermine des niveaux de puissance dans les différents domaines de fréquence et en ce que le dispositif de réglage (r) est conformé de telle manière que, à chaque fois, on traite les mêmes domaines de fréquence.
EP95118595A 1995-11-25 1995-11-25 Circuit pour la modification d'un signal Expired - Lifetime EP0776144B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59509187T DE59509187D1 (de) 1995-11-25 1995-11-25 Signalmodifikationsschaltung
EP95118595A EP0776144B1 (fr) 1995-11-25 1995-11-25 Circuit pour la modification d'un signal
JP8311836A JPH09191499A (ja) 1995-11-25 1996-11-22 信号修正回路
US08/754,144 US5822437A (en) 1995-11-25 1996-11-22 Signal modification circuit
KR1019960056382A KR100424520B1 (ko) 1995-11-25 1996-11-22 신호변경회로및방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95118595A EP0776144B1 (fr) 1995-11-25 1995-11-25 Circuit pour la modification d'un signal

Publications (2)

Publication Number Publication Date
EP0776144A1 EP0776144A1 (fr) 1997-05-28
EP0776144B1 true EP0776144B1 (fr) 2001-04-11

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EP95118595A Expired - Lifetime EP0776144B1 (fr) 1995-11-25 1995-11-25 Circuit pour la modification d'un signal

Country Status (5)

Country Link
US (1) US5822437A (fr)
EP (1) EP0776144B1 (fr)
JP (1) JPH09191499A (fr)
KR (1) KR100424520B1 (fr)
DE (1) DE59509187D1 (fr)

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US7242779B2 (en) * 2002-05-30 2007-07-10 Peavey Electronics Corporation Methods and apparatus for sub-harmonic generation, stereo expansion and distortion
JP4509686B2 (ja) * 2004-07-29 2010-07-21 新日本無線株式会社 音響信号処理方法および装置
JP2009065436A (ja) * 2007-09-06 2009-03-26 New Japan Radio Co Ltd ステレオ再生装置
US8335331B2 (en) * 2008-01-18 2012-12-18 Microsoft Corporation Multichannel sound rendering via virtualization in a stereo loudspeaker system
US8577065B2 (en) * 2009-06-12 2013-11-05 Conexant Systems, Inc. Systems and methods for creating immersion surround sound and virtual speakers effects
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Also Published As

Publication number Publication date
EP0776144A1 (fr) 1997-05-28
KR970032266A (ko) 1997-06-26
KR100424520B1 (ko) 2004-06-18
DE59509187D1 (de) 2001-05-17
JPH09191499A (ja) 1997-07-22
US5822437A (en) 1998-10-13

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