WO2000005926A1 - Controleur de signal audio et dispositif de reproduction le contenant - Google Patents

Controleur de signal audio et dispositif de reproduction le contenant Download PDF

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Publication number
WO2000005926A1
WO2000005926A1 PCT/JP1999/003882 JP9903882W WO0005926A1 WO 2000005926 A1 WO2000005926 A1 WO 2000005926A1 JP 9903882 W JP9903882 W JP 9903882W WO 0005926 A1 WO0005926 A1 WO 0005926A1
Authority
WO
WIPO (PCT)
Prior art keywords
state
band
circuit
surround
audio data
Prior art date
Application number
PCT/JP1999/003882
Other languages
English (en)
Japanese (ja)
Inventor
Eiji Nakatani
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to DE19983393T priority Critical patent/DE19983393T1/de
Priority to GB0026959A priority patent/GB2352379B8/en
Publication of WO2000005926A1 publication Critical patent/WO2000005926A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • 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
    • 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
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • 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
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/10537—Audio or video recording
    • G11B2020/10592—Audio or video recording specifically adapted for recording or reproducing multichannel signals
    • G11B2020/10601—Audio or video recording specifically adapted for recording or reproducing multichannel signals surround sound signal

Definitions

  • an audio signal control device is a two-channel audio signal control device having a surround circuit, comprising: a surround circuit capable of switching a surround effect between an on state and an off state; The bandpass on state, in which the middle frequency of the audio signal frequency band is output with a higher gain than the low and high frequencies, and the bandbus off state, in which the frequency characteristics are flat from low to high, are installed in the channel.
  • a possible band-pass circuit, and a control unit that switches the surround circuit and the band-pass circuit between an on state and an off state in cooperation with each other are provided.
  • a stereo movie source by installing a simple circuit configuration and two stereo speakers on both sides of a TV monitor, a stereo movie source has a sound with a sharp outline and a sense of spaciousness that can be obtained in a movie theater. A sound effect is obtained, and the dialogue is localized at the center of the image to achieve a positional match with the image.
  • a voice signal control device is obtained.
  • the audio signal control device of the present invention has a surround circuit.
  • a surround sound circuit that can switch the surround effect between the on state and the off state, and a sound signal control device that is installed in each channel to compare the middle band of the sound signal frequency band with the low band and the high band
  • a bandpass circuit capable of switching to a bandpass on state for outputting at a low gain and a bandpass off state with flat frequency characteristics from a low band to a high band, and an electro-acoustic converter connected to the output of each channel.
  • the control unit switches between the on-state and the off-state by interlocking the surround circuit and the band bus circuit with high-speed electric-to-acoustic conversion of the middle range more efficiently than the low range and the high range. It is characterized by.
  • the multi-channel audio data is Dolby Digital (AC 3) audio data or dts audio data.
  • the reproducing apparatus of the present invention is a reproducing apparatus capable of reproducing a DVD in which a multi-channel audio data is recorded together with at least a video data as a recording medium, wherein a disc of the recording medium is a DVD or another type.
  • FIG. 6 is a configuration diagram of a conventional audio device having a surround circuit. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 shows an audio signal control device according to the first embodiment of the present invention. Since the configuration of the right channel and the left channel is the same, the right channel will be described as an example.
  • a band-pass circuit 11 R is provided at a stage preceding the matrix surround circuit 1.
  • This bandpass circuit 11 R is connected to an amplifier 7 R by a first feedback circuit 12 composed of a resistor and a capacitor for a high frequency cut, and a second feedback circuit composed of a resistor and a capacitor for a low frequency cut.
  • the feedback circuit 1'3 is connected, and the bandpass characteristic is switched by turning on / off the transistor 14R.
  • the frequency characteristic shows a flat frequency characteristic from the low band to the high band as shown by the solid line 15, and in the band-pass on state where the transistor 14R is turned on.
  • the mid-range centered at 1 kHz is output with a higher gain by +5 dB than the low-range and high-range.
  • the turning on / off of the transistor 14 R is executed by the control unit 3 which turns on / off the surround effect.
  • the bandpass circuit 11 R When playing a visual stereo signal such as a movie source, when switch 2 is turned on, the field effect transistor 4 is turned on, the surround effect of the matrix surround circuit 1 is turned on, and the transistor 1 is turned on. 4R is turned on, and as shown by the broken line 16 in the frequency characteristic of the bandpass circuit 11R, only the middle band is output with a high gain of 5 dB. Therefore, the bandpass circuit 11 R increases the harmonic content of explosions and bullet sounds in dialogue and movie battle scenes, resulting in a cinema-like sound with a clearly defined sound.
  • the simple circuit configuration and the two stereo powers are installed on both sides of the TV monitor, so that a stereo movie source has a sharp outline as obtained in a movie theater. And the effect sound with a sense of spaciousness is obtained, and the dialogue is localized at the center of the image to achieve positional matching with the image. It is.
  • Embodiment 2 differs from Embodiment 1 in the frequency characteristics of the speakers 10R and 10L and the frequency characteristics of the bandpass circuits 11R and 11L. Others are the same as (Embodiment 1).
  • the speakers 10 R and 10 L of (Embodiment 1) have a frequency characteristic that is as flat as possible from low to high frequencies. As shown by the broken line 17 in FIG. 3, the acoustic frequency characteristic of 10 L is converted from electric to acoustic in the middle band around 1 kHz with higher efficiency than the low band and the high band.
  • the frequency characteristics of the bandpass circuits 11 R and 11 L are adjusted so that the middle band centered at 1 kHz is output with a lower gain than the low band and high band as shown by the broken line 18 in FIG. 1,
  • the constants of the capacitors and resistors of the second feedback circuit 12 and 13 are changed.
  • the control unit 3 turns on the transistor 14R and turns off the field effect transistor 4.
  • the music signal that enters the amplifier 7R is output at a lower gain in the middle range than in the low and high ranges, but the acoustic frequency characteristics of the single speaker 10R are high-efficiency in the middle range.
  • the acoustic frequency coming out of the speaker 10R to convert The characteristic is a flat composite frequency characteristic from low to high as shown by the solid line 19 in FIG.
  • switch 2 When playing a visual stereo signal such as a movie source, switch 2 is turned on and control unit 3 turns off transistor 14 R and field effect transistor 4 to turn on the music signal. Comes out of the speakers 10 R and 10 L with the frequency characteristic raised by 5 dB.
  • the stereo movie source has a sharp outline and a sense of spaciousness that can be obtained in a movie theater. Sound effects can be obtained, and the dialogue is localized at the center of the image to achieve positional matching with the image. In addition, sound quality similar to that of conventional music sources can be obtained.
  • the recording / reproducing apparatus shown in FIG. 4 uses DVD, VI DEO- A device capable of reproducing an optical disc 20, such as a CD (hereinafter, referred to as a VCD) and a CD-DA.
  • VCD and CD—DA is a CD standard with a common physical structure, and the collective term for both is CD.
  • the detection signal of the optical pickup 22 is amplified by the RF amplifier 23, and the servo / disk discriminating means 24 discriminates from the output signal of the RF amplifier 23 whether the optical disc 20 is DVD or CD, and Controls focus control of pickup 22, tracking servo, and spindle servo of spindle motor 21.
  • a decoder 25 has an audio decoder 26 together with a video decoder (not shown).
  • the audio decoder 26 downmixes and outputs as an L, R 2-channel stereo signal.
  • the data input to the audio decoder 26 is used. This is done by reading the evening into the control unit 27 and determining the identification code of the control information recorded on the DVD from the read information. That is, the type of the recording method of the audio compression of MPEG 2 audio data, Dolby AC-3 audio data, and dts audio data is determined.
  • the data of each of the left and right channels, which are down-mixed into two channels from the audio decoder 26, are input to the band-pass circuits 11R and 11L. Is done.
  • the bandpass circuits 1 1 R and 1 1 L provide a band pass on state in which the output of the audio decoder 26 is output with a higher gain in the middle of the audio signal frequency band than the low and high bands, and a low pass It can be switched to a band pass off state that outputs with flat frequency characteristics from to the high frequency range.
  • the outputs of the bandpass circuits 11 R and 11 L are input to the matrix surround circuit 1.
  • the matrix surround circuit 1 is configured to be switchable between an on state in which the output of the bandpass circuits 11 R and 11 is applied with a surround effect and an off state in which the output is applied without the surround effect.
  • the output of the bandpass circuit 11 R via the matrix surround circuit 1 is reproduced by the speaker 10 R via the amplifier 9 R, and the output of the band bus circuit 11 L via the matrix surround circuit 1 Is reproduced by the speaker 10L via the amplifier 9L.
  • the control unit 27 collects disc discrimination result information with respect to the servo / disc discriminating means 24 and performs reproduction control on the reproduction of the optical disc 20, and controls the decoder 25 as described above.
  • the type of audio data is determined by determining the identification code of the control information recorded on the DVD from the read information, and the audio data decoding method is set based on the determination of the recording method.
  • R, 11 L and the matrix surround circuit 1 are turned on / off by the control described later, and the above-mentioned on / off state is displayed on the display unit 28.
  • the control unit 27 is configured to collect pressing information of an on-switch and an off-switch (not shown) of the operation unit 29 and perform switching between the band-pass circuits 11 R and 11 L and the matrix surround circuit 1. .
  • the output of the RF amplifier 23 is input to the decoder 25, and when the optical disk 20 is a DVD, the input data is read from the audio decoder 26 to the control unit 27, and the read information is recorded on the DVD.
  • the type of the recorded recording method is determined by determining the identification code of the control information.
  • the control unit 27 sets the decoding method in the audio decoder 26 based on the result of the discrimination of the recording method. Then, the audio decoder 26 whose decoding method is set by the control unit 27 downmixes the output of the RF amplifier 23 in the case of multi-channel, and decodes it into a 2-channel stereo audio signal.
  • the output of the audio decoder 26 is input to each of the band-pass circuits 11 R and 11 L.
  • FIG. 5 shows a processing routine for controlling the band-pass circuits 11 R and 11 L and the matrix surround circuit 1 by the control unit 27.
  • step S 101 the control unit 27 determines that the servo / disk It is determined whether the optical disk 20 is a DVD from the optical disk determination information obtained from the stage 24. If the optical disc 20 is a CD, then the routine from step S102 to step S104 is executed.
  • step S102 the bandpass circuits 11R and 11L and the matrix surround circuit 1 are turned off.
  • step S103 the display section 28 displays the OFF state.
  • step S104 it is detected whether or not the on-switch of the operation section 29 is operated, and if not, the steps S102 and S103 are repeated. If it is detected in step S104 that the on-switch of the operation unit 29 has been operated, the routine from step S105 to step S107 is executed.
  • step S105 the bandpass circuits 11R and 11L and the matrix surround circuit 1 are turned on.
  • step S106 the display section 28 displays the ON state.
  • step S107 it is detected whether or not the off switch of the operation unit 29 is operated, and if not, steps S105 and S106 are repeated. If it is detected in step S107 that the off switch of the operation unit 29 has been operated, the process returns to step S102.
  • step S108 If it is determined in step S108 that the recording method of the optical disk 20 is AC-3, the routine from step S105 to step S107 is executed, and the bandpass circuit 111 is executed. R, 11 L and matrix surround circuit 1 automatically switch on.
  • step S108 the recording method of the optical disk 20 must be AC_3. If it is determined, in step S109, it is determined whether the recording method is dts from the stream ID analyzed by the recording method determination unit 25.
  • step S109 If it is determined in step S109 that the recording method of the optical disk 20 is dts, the routine of steps S105 to S107 is executed to execute the bandpass circuit 11R, 1. 1 L and matrix surround circuit 1 power Automatically switched on.
  • step S109 If it is determined in step S109 that the recording method of the optical disk 20 is not dts, the routine from step S102 to step S104 is executed, and the band-pass circuit 11 R, 1 1 L and matrix surround circuit 1 power S Automatically switched off.
  • the band bus circuits 11 R and 11 L and the matrix are automatically determined.
  • the sound output from the two-channel loudspeaker despite the sound output from the two-channel loudspeaker, can be obtained with a clearly defined sound. A spacious sound effect can be obtained.
  • the display unit 28 will display OFF and the matrix surround circuit 1 and band By turning off the pass circuits 11 R and 11 L, it is possible to obtain the conventional sound quality for reproducing the audio recording information of the optical disc 20.
  • the surround circuit and band pass circuit should be turned on automatically.
  • a playback device that can produce a sound with a sharp contour and a spacious sound effect that can be obtained in a movie theater without any operation, despite the sound output from a two-channel speaker. Can be realized.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

L'invention concerne un contrôleur de signal audio capable de produire une voix ayant un contour clair et un effet sonore conférant une sensation d'élargissement du son lorsque la source est un film stéréophonique, capable de localiser la parole au centre de l'écran, et présentant une qualité de son aussi bonne que la qualité habituelle lorsque la source est de la musique. Le contrôleur comprend un circuit d'ambiance (1) et des circuits passe-bande (11R, 11L) connectés chacun au circuit d'ambiance (1) en série pour chaque canal. Les caractéristiques des circuits (1, 11R, 11L) sont commutées à l'état de marche/arrêt de façon coordonnée par une partie de commande (3). Lorsque des signaux stéréo provenant, par exemple, d'une source cinématographique sont reproduits, un commutateur (2) passe à un état de marche afin d'arrêter le transistor (14R) et de mettre en marche un transistor à effet de champ (4) à l'aide de la partie de commande (3). Ainsi, le signal de musique ayant une caractéristique de fréquence telle que le médium est plus fort que les autres gammes, est reproduit par les haut-parleurs (10R, 10L), produisant ainsi une voix ayant un contour clair et un effet sonore conférant une sensation d'élargissement du son.
PCT/JP1999/003882 1998-07-24 1999-07-19 Controleur de signal audio et dispositif de reproduction le contenant WO2000005926A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19983393T DE19983393T1 (de) 1998-07-24 1999-07-19 Audiosignalsteuerung und diese enthaltende Wiedergabevorrichtung
GB0026959A GB2352379B8 (en) 1998-07-24 1999-07-19 Audio signal controller and reproducing device comprising the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/208456 1998-07-24
JP20845698 1998-07-24

Publications (1)

Publication Number Publication Date
WO2000005926A1 true WO2000005926A1 (fr) 2000-02-03

Family

ID=16556502

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/003882 WO2000005926A1 (fr) 1998-07-24 1999-07-19 Controleur de signal audio et dispositif de reproduction le contenant

Country Status (4)

Country Link
CN (1) CN1136759C (fr)
DE (1) DE19983393T1 (fr)
GB (1) GB2352379B8 (fr)
WO (1) WO2000005926A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8965546B2 (en) 2010-07-26 2015-02-24 Qualcomm Incorporated Systems, methods, and apparatus for enhanced acoustic imaging
JP6171285B2 (ja) * 2012-08-23 2017-08-02 ティアック株式会社 マルチトラックレコーダ
GB2534949B (en) 2015-02-02 2017-05-10 Cirrus Logic Int Semiconductor Ltd Loudspeaker protection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0553399U (ja) * 1991-12-17 1993-07-13 三洋電機株式会社 サラウンド効果切換装置
JPH07336799A (ja) * 1994-06-07 1995-12-22 Matsushita Electric Ind Co Ltd サラウンド信号処理回路
JPH0984198A (ja) * 1995-09-13 1997-03-28 Nippon Columbia Co Ltd 音信号処理装置およびサラウンド再生方法
JPH09200900A (ja) * 1996-01-23 1997-07-31 Matsushita Electric Ind Co Ltd 音声出力制御回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0553399U (ja) * 1991-12-17 1993-07-13 三洋電機株式会社 サラウンド効果切換装置
JPH07336799A (ja) * 1994-06-07 1995-12-22 Matsushita Electric Ind Co Ltd サラウンド信号処理回路
JPH0984198A (ja) * 1995-09-13 1997-03-28 Nippon Columbia Co Ltd 音信号処理装置およびサラウンド再生方法
JPH09200900A (ja) * 1996-01-23 1997-07-31 Matsushita Electric Ind Co Ltd 音声出力制御回路

Also Published As

Publication number Publication date
GB2352379B8 (en) 2011-04-27
CN1136759C (zh) 2004-01-28
GB0026959D0 (en) 2000-12-20
GB2352379A8 (en) 2011-04-27
CN1308833A (zh) 2001-08-15
GB2352379B (en) 2003-01-22
DE19983393T1 (de) 2001-06-13
GB2352379A (en) 2001-01-24

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