WO2000074439A1 - Amplificateur d'image stéréo-acoustique - Google Patents

Amplificateur d'image stéréo-acoustique Download PDF

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Publication number
WO2000074439A1
WO2000074439A1 PCT/JP2000/003379 JP0003379W WO0074439A1 WO 2000074439 A1 WO2000074439 A1 WO 2000074439A1 JP 0003379 W JP0003379 W JP 0003379W WO 0074439 A1 WO0074439 A1 WO 0074439A1
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WO
WIPO (PCT)
Prior art keywords
filter
signal
input signal
difference signal
pass filter
Prior art date
Application number
PCT/JP2000/003379
Other languages
English (en)
Japanese (ja)
Inventor
Seiji Kawano
Original Assignee
Sanyo Electric 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 Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Priority to EP00931572A priority Critical patent/EP1189483A1/fr
Publication of WO2000074439A1 publication Critical patent/WO2000074439A1/fr

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Classifications

    • 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
    • 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
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/13—Aspects of volume control, not necessarily automatic, in stereophonic sound systems

Definitions

  • the present invention relates to a stereo sound image enlarging device applied to, for example, electronic devices, game machines, audio devices, and the like. Background technology>
  • a technology has been developed in which the sound image is localized outside the left and right speakers by mixing opposite-phase sounds with the reproduced sound. With this technology, the stereo sound image can be enlarged, and the sound stage can be greatly expanded.
  • the stereo sound image enlarging device disclosed in Japanese Patent Application Laid-Open No. Hei 9-168020 discloses a first operation unit that generates a difference signal by subtracting a second input signal from a first input signal.
  • a filter unit that generates a filter difference signal by filtering the difference signal from the first arithmetic unit; and a second unit that generates a first output signal by adding the first input signal and the filter difference signal from the filter unit.
  • the filter section consists of only a low-pass filter, a stereo sound source in which extremely low-frequency sounds, such as the bass sound of a musical instrument in a song or the sound of a pass drum, are recorded only by panning, Since the low-frequency difference signal is added to and subtracted from both the left and right channels, the low-frequency signal increases in volume and is more strongly panned, although it is easier for the listener to perceive. As a result, there is a problem that the tone becomes very uncomfortable. In particular, an increase in the volume of the low frequency band is a fatal problem in reproduction using a small speaker that cannot reproduce the low frequency band.
  • Japanese Patent Application Laid-Open Publication No. H08-509094 (published patent publication) describes that the filter section is composed of a band-pass filter. As disclosed in Japanese Patent Application Laid-Open No. 09-104, it is as narrow as 300 Hz to 2 kHz, so that a natural reproduced sound cannot be obtained.
  • a stereo sound image enlarging device includes: a first arithmetic unit that subtracts a second input signal from a first input signal to generate a difference signal; and filters and filters a difference signal from the first arithmetic unit.
  • a third pass signal having a cut-off frequency of 5 kHz and a high-pass filter having a cut-off frequency of 20 OHz.
  • the filter unit further includes a gain adjuster that limits the amplitude of the difference signal after the filtering by the one-pass filter and the high-pass filter.
  • FIG. 1 is a block diagram showing a configuration of a stereo sound image enlarging system.
  • FIG. 2 is a block diagram showing a configuration of the stereo sound image enlarging device of FIG.
  • FIG. 3 is a graph showing a frequency characteristic of the one-pass filter of FIG.
  • FIG. 4 is a graph showing frequency characteristics of the high-pass filter of FIG.
  • Figure 5 is a graph showing the combined characteristics of a single-pass finolater and a no-pass filter.
  • Fig. 1 shows the configuration of a stereo sound image expansion system using a stereo sound image expansion device.
  • the stereo sound image enlargement system includes an external device 1, a stereo sound image enlargement device 2, a left speaker 3a, and a right speaker 3b.
  • an electronic musical instrument, a game machine, an audio device or the like having a left channel signal and a right channel signal output terminal is used as the external device 1.
  • the left channel input signal (first input signal) L in and the right channel input signal (second input signal) R in generated by the external device 1 are output to the stereo sound image enlarging device 2.
  • the stereo sound image enlarging device 2 processes the left channel input signal L in and the right channel input signal R in to output a left channel output signal (first output signal) L out and a right channel output signal. (2nd output signal) R out is generated and output to the speeds 3a and 3b.
  • FIG. 2 shows the configuration of the stereo sound image enlarging device 2.
  • the input signal L in for the left channel from the external device 1 is supplied to the first arithmetic unit 4 and the second arithmetic unit 5.
  • the right channel input signal R in from the external device 1 is supplied to the first arithmetic unit 4 and the third arithmetic unit 6.
  • the first arithmetic unit 4 generates a difference signal SD by subtracting the right channel input signal R in from the left channel input signal L in.
  • the first calculation unit 4 is configured by, for example, an operational amplifier, and when the left channel input signal L in is a digital signal, For example, it is composed of DSP or CPU.
  • the difference signal SD output from the first calculation unit 4 is supplied to the filter unit 7.
  • H The inoleter unit 7 includes a low-pass filter 8, a high-pass filter 9, and an amplitude adjuster 10.
  • FIG. 3 shows the frequency characteristics of the low-pass filter 8
  • FIG. 4 shows the frequency characteristics of the high-pass filter 9
  • FIG. 5 shows the combined filter characteristics of the low-pass filter 8 and the high-pass filter 9, respectively.
  • FIG. 5 (a) shows the synthesized frequency characteristics of the low-pass filter 8 and the high-pass filter 9
  • FIG. 5 (b) shows the synthesized phase characteristics of the low-pass filter 8 and the high-pass filter 9, respectively.
  • the low-pass filter 8 sets the cutoff frequency to 5 kHz, removes the high-frequency component of the difference signal SD from the first arithmetic unit 4, and outputs the first filter output signal SF1.
  • the high-pass filter 9 sets the cut-off frequency to 20 OHz, removes the low-frequency component of the first filter output signal S F1 from the low-pass filter 8, and outputs a second filter output signal SF 2.
  • the amplitude adjuster 10 multiplies the second filter output signal S F2 by a predetermined multiplication coefficient in order to output the filter difference signal S F3 while limiting the amplitude of the second filter output signal S F2.
  • a known analog low-pass filter can be used as the filter unit 7.
  • a digital filter including a delay element, a coefficient multiplier, and an adder can be used as the filter unit 7.
  • the functions of the delay element, the coefficient multiplier, and the adder can be realized by the processing of the DSP or the CPU.
  • this filter unit 7 for example, a primary IR digital one-pass filter with a cutoff frequency of 5 kHz, a primary IR digital high-pass filter with a power-off frequency of 200Hz, or the like can be used.
  • the amplitude adjuster 10 When the second filter output signal SF2 is an analog signal, a device that adjusts the amplitude of the second filter output signal SF2 using a resistor or the like is used as the amplitude adjuster 10.
  • the multiplication function of the amplitude adjuster 10 can be realized by DSP or CPU processing. This For example, a value from 0 to 1 can be used as a multiplication coefficient of the amplitude adjuster 10.
  • a left channel input signal L in and a right channel input signal R in are input to the stereo sound image enlarging device 2 from an external device 1 such as a game machine.
  • the left-channel input signal L i n input to the stereo sound image enlarging device 2 is input to the first arithmetic unit 4 and the second arithmetic unit 5.
  • the input signal R in for the right channel input to the stereo sound image enlarging device 2 is input to the first arithmetic unit 4 and the third arithmetic unit 6.
  • the first calculation unit 4 subtracts the input signal R in for the right channel from the input signal L in for the left channel and outputs a difference signal SD.
  • the difference signal SD output from the first calculation unit 4 is input to the subsequent filter unit 7.
  • the difference signal SD input to the filter unit 7 is filtered by the low-pass filter 8, and the first filter output signal S F 1 is output from the low-pass filter 8.
  • the first filter output signal SF1 is filtered by the high-pass filter 9, and the high-pass filter 9 outputs the second filter output signal SF2.
  • the second filter output signal S F 2 is sent to the amplitude adjuster 10.
  • the amplitude of the second filter output signal SF2 is multiplied by a predetermined coefficient to limit the amplitude of the second filter output signal SF2, and a filter difference signal SF that is a result of the multiplication is multiplied. 3 is output from the amplitude adjuster 10.
  • the filter difference signal S F3 output from the filter unit 7 is input to the second arithmetic unit 5 and the third arithmetic unit 6.
  • the second arithmetic unit 5 adds the input signal L in for the left channel and the filter difference signal S F3, and outputs the addition result as an output signal L out for the left channel.
  • the third arithmetic unit 6 subtracts the filter difference signal SF3 from the input signal R in for the right channel, and outputs the subtraction result as an output signal R out for the right channel.
  • the output signal L out for the left channel output from the second arithmetic unit 5 is sent to the left speaker, not shown, and the output signal for the right channel output from the third arithmetic unit 6 R out is sent to a right speaker (not shown). This allows the listener to hear the enlarged sound image.
  • the first input signal is the input signal R in for the left channel and the second input signal is the input signal R in for the right channel, but the first input signal is the input signal R in for the right channel. in, and the second input signal may be the left channel input signal L in.
  • the first output signal is the right channel output signal Rout
  • the second output signal is the left channel output signal Lout.
  • the left and right channels are panned with the same phase or with a small phase difference (for example, bass and bass drum sounds), the left and right amplitude ratios are not changed and are emphasized. There is no sense of discomfort.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Stereophonic System (AREA)

Abstract

L'invention concerne un amplificateur d'image stéréo-acoustique comprenant: un premier circuit destiné à soustraire un second signal d'entrée d'un premier signal d'entrée, afin de générer un signal de différence; un filtre permettant de filtrer ce signal de différence, émis par le premier circuit, pour générer un signal de différence filtré; un deuxième circuit conçu pour ajouter le premier signal d'entrée au signal de différence filtré, émis par le filtre, pour générer un premier signal de sortie; et un troisième circuit pour soustraire le signal de différence filtré du second signal d'entrée. Le filtre susmentionné est pourvu d'un filtre passe-bas avec une fréquence de coupure égale à 5kHz, et d'un filtre passe-haut avec une fréquence de coupure qui atteint 200kHz.
PCT/JP2000/003379 1999-05-28 2000-05-25 Amplificateur d'image stéréo-acoustique WO2000074439A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00931572A EP1189483A1 (fr) 1999-05-28 2000-05-25 Amplificateur d'image st r o-acoustique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11150473A JP2000341798A (ja) 1999-05-28 1999-05-28 ステレオ音像拡大装置
JP11/150473 1999-05-28

Publications (1)

Publication Number Publication Date
WO2000074439A1 true WO2000074439A1 (fr) 2000-12-07

Family

ID=15497683

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/003379 WO2000074439A1 (fr) 1999-05-28 2000-05-25 Amplificateur d'image stéréo-acoustique

Country Status (5)

Country Link
EP (1) EP1189483A1 (fr)
JP (1) JP2000341798A (fr)
KR (1) KR100563499B1 (fr)
CN (1) CN1353917A (fr)
WO (1) WO2000074439A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5866153B2 (ja) * 2011-07-04 2016-02-17 ローム株式会社 サラウンド回路および音声出力装置
EP2759148A4 (fr) * 2011-09-19 2014-10-08 Huawei Tech Co Ltd Procédé et appareil de génération d'un signal acoustique ayant un effet spatial amélioré
CN105847497A (zh) * 2016-03-28 2016-08-10 乐视控股（北京）有限公司 一种语音信号处理方法及装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS575500A (en) * 1980-06-12 1982-01-12 Mitsubishi Electric Corp Acoustic reproducing device
JPS63317000A (ja) * 1987-06-19 1988-12-26 Sanyo Electric Co Ltd ３ｄ方式のステレオ再生装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5692050A (en) * 1995-06-15 1997-11-25 Binaura Corporation Method and apparatus for spatially enhancing stereo and monophonic signals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS575500A (en) * 1980-06-12 1982-01-12 Mitsubishi Electric Corp Acoustic reproducing device
JPS63317000A (ja) * 1987-06-19 1988-12-26 Sanyo Electric Co Ltd ３ｄ方式のステレオ再生装置

Also Published As

Publication number Publication date
KR100563499B1 (ko) 2006-03-28
JP2000341798A (ja) 2000-12-08
KR20020003571A (ko) 2002-01-12
CN1353917A (zh) 2002-06-12
EP1189483A1 (fr) 2002-03-20

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