EP1189483A1 - Stereoakustischer bildverstärker - Google Patents

Stereoakustischer bildverstärker Download PDF

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Publication number
EP1189483A1
EP1189483A1 EP00931572A EP00931572A EP1189483A1 EP 1189483 A1 EP1189483 A1 EP 1189483A1 EP 00931572 A EP00931572 A EP 00931572A EP 00931572 A EP00931572 A EP 00931572A EP 1189483 A1 EP1189483 A1 EP 1189483A1
Authority
EP
European Patent Office
Prior art keywords
filter
signal
operation unit
input signal
pass filter
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.)
Withdrawn
Application number
EP00931572A
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English (en)
French (fr)
Inventor
Seiji Sanyo Electric Co. Ltd KAWANO
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.)
Sanyo Electric Co Ltd
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
Publication of EP1189483A1 publication Critical patent/EP1189483A1/de
Withdrawn legal-status Critical Current

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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 acoustic image amplifier which is applied to electronic equipment, a game machine, and acoustic equipment, for example.
  • a technique for mixing with a reproduced sound a sound 180° out of phase with the reproduced sound so that an acoustic image is oriented outside right and left speakers has been developed. If the technique is used, a stereo acoustic image can be amplified, thereby making it possible to significantly amplify a sound stage.
  • the stereo acoustic image amplifier disclosed in JP-A-9-168200 is characterized by comprising a first operation unit for subtracting a second input signal from a first input signal to generate a difference signal, a filter for filtering the difference signal from the first operation unit to generate a filter difference signal, a second operation unit for adding the first input signal and the filter difference signal from the filter to generate a first output signal, and a third operation unit for subtracting from the second input signal the filter difference signal from the filter, the filter being comprised of a low-pass filter.
  • the filter is comprised of only a low-pass filter.
  • a low frequency difference signal is added or subtracted to or from both right and left channels. Accordingly, irrespective of the fact that the low frequency signal is more easily recognized by a listener, the sound volume is increased. Moreover, the panning is strengthened, so that an outputted sound enters an offset state. As a result, the outputted sound becomes a sound having a significantly uncomfortable feeling.
  • the increase in the sound volume in the low frequency region is a fatal problem in reproduction using a small-sized speaker which cannot reproduce the low frequency region.
  • JP-A-8-509104 discloses that a filter is comprised of a band-pass filter.
  • the band of the band-pass filter is as narrow as 300 Hz to 2 KHz, as disclosed in JP-A-8-509104. Consequently, a natural reproduced sound cannot be obtained.
  • An object of the present invention is to provide a stereo acoustic image amplifier in which even in a low frequency signal (e.g., a sound of a bass or a bass drum) which is only panned with the right and left channels being in phase or slightly out of phase, the ratio of the amplitudes of the right and left channels does not vary, and an uncomfortable feeling to be emphasized is also eliminated.
  • a low frequency signal e.g., a sound of a bass or a bass drum
  • a stereo acoustic image amplifier is characterized by comprising a first operation unit for subtracting a second input signal from a first input signal to generate a difference signal; a filter for filtering the difference signal from the first operation unit to generate a filter difference signal; a second operation unit for adding the first input signal and the filter difference signal from the filter to generate a first output signal; and a third operation unit for subtracting from the second input signal the filter difference signal from the filter, the filter comprising a low-pass filter having a cut-off frequency of 5 kHz and a high-pass filter having a cut-off frequency of 200 Hz.
  • the filter further comprises a gain adjuster for limiting the amplitude of the difference signal which has been filtered by the low-pass filter and the high-pass filter.
  • Fig. 1 illustrates the configuration of a stereo acoustic image amplifying system utilizing a stereo acoustic image amplifier.
  • the stereo acoustic image amplifying system comprises an external device 1, a stereo acoustic image amplifier 2, a left speaker 3a, and a right speaker 3b.
  • Examples of the external device 1 include an electronic musical instrument, a game machine, acoustic equipment, and so forth having output terminals of a left channel signal and a right channel signal.
  • a left channel input signal (a first input signal) Lin and a right channel input signal (a second input signal) Rin which are generated in the external device 1 are outputted to the stereo acoustic image amplifier 2.
  • the stereo acoustic image amplifier 2 processes the left channel input signal Lin and the right channel input signal Rin, to generate a left channel output signal (a first output signal) Lout and a right channel output signal (a second output signal) Rout and respectively output the signals to the speakers 3a and 3b.
  • Fig. 2 illustrates the configuration of the stereo acoustic image amplifier 2.
  • the left channel input signal Lin from the external device 1 is fed to a first operation unit 4 and a second operation unit 5.
  • the right channel input signal Rin from the external device 1 is fed to the first operation unit 4 and a third operation unit 6.
  • the first operation unit 4 subtracts the right channel input signal Rin from the left channel input signal Lin, to generate a difference signal SD.
  • the first operation unit 4 is comprised of an operational amplifier, for example, when the left channel input signal Lin is an analog signal, while being comprised of a DSP (Digital Signal Processor) or a CPU (Central Processing Unit) , for example, when the left channel input signal Lin is a digital signal.
  • DSP Digital Signal Processor
  • CPU Central Processing Unit
  • the difference signal SD outputted from the first operation unit 4 is fed to a filter 7.
  • the filter 7 comprises a low-pass filter 8, a high-pass filter 9, and an amplitude adjuster 10.
  • Fig. 3, Fig. 4, and Fig. 5 respectively illustrate frequency characteristics of the low-pass filter 8, frequency characteristics of the high-pass filter 9, and composite filter characteristics of the low-pass filter 8 and the high-pass filter 9.
  • Fig. 5 (a) and Fig. 5 (b) respectively illustrate composite frequency characteristics of the low-pass filter 8 and the high-pass filter 9 and composite phase characteristics of the low-pass filter 8 and the high-pass filter 9.
  • the low-pass filter 8 whose cut-off frequency is 5 kHz, removes a high frequency component of the difference signal SD from the first operation unit 4, to output a first filter output signal SF1.
  • An amplitude adjuster 10 multiplies the second filter output signal SF2 by a predetermined multiplication factor in order to limit the amplitude of the second filter output signal SF2 to output a filter difference signal SF3.
  • a well-known analog low-pass filter can be used as the filter 7.
  • a digital filter comprising a delay element, a factor multiplier, and an adder can be used as the filter 7.
  • the functions of the delay element, the factor multiplier and the adder can be also realized by processing performed by the DSP or the CPU. It is possible to use as the filter 7 a primary IIR (Infinite Impulse Response) digital low-pass filter having a cut-off frequency of 5 kHz and a primary IIR digital high-pass filter having a cut-off frequency of 200 Hz, for example.
  • IIR Infinite Impulse Response
  • An example of the amplitude adjuster 10 is one for adjusting, when the second filter output signal SF2 is an analog signal, the amplitude of the second filter output signal SF2 by resistance or the like.
  • the multiplying function of the amplitude adjuster 10 can be also realized by processing performed by the DSP or the CPU. Values from 0 to 1, for example, can be used as a multiplication factor of the amplitude adjuster 10.
  • a left channel input signal Lin and a right channel input signal Rin are inputted to the stereo acoustic image amplifier 2 from the external device such as the game machine.
  • the left channel input signal Lin inputted to the stereo acoustic image amplifier 2 is inputted to the first operation unit 4 and the second operation unit 5.
  • the right channel input signal Rin inputted to the stereo acoustic image amplifier 2 is inputted to the first operation unit 4 and the third operation unit 6.
  • the first operation unit 4 subtracts the right channel input signal Rin from the inputted left channel input signal Lin, to output a difference signal SD.
  • the difference signal SD outputted from the first operation unit 4 is inputted to the filter 7 in the succeeding stage.
  • the difference signal SD inputted to the filter 7 is filtered by the low-pass filter 8, so that a first filter output signal SF1 is outputted from the low-pass filter 8.
  • the first filter output signal SF1 is filtered by the high-pass filter 9, so that a second filter output signal SF2 is outputted from the high-pass filter 9.
  • the second filter output signal SF2 is fed to the amplitude adjuster 10.
  • the amplitude of the second filter output signal SF2 is multiplexed by a predetermined factor in order to limit the amplitude of the second filter output signal SF2, so that a filter difference signal SF3 which is the result of the multiplication is outputted from the amplitude adjuster 10.
  • the filter difference signal SF3 outputted from the filter 7 is inputted to the second operation unit 5 and the third operation unit 6.
  • the second operation unit 5 adds the left channel input signal Lin and the filter difference signal SF3, and outputs the result of the addition as a left channel output signal Lout.
  • the third operation unit 6 subtracts the filter difference signal SF3 from the right channel input signal Rin, and outputs the result of the subtraction as a right channel output signal Rout.
  • the left channel output signal Lout outputted from the second operation unit 5 is fed to a left speaker (not shown), and the right channel output signal Rout outputted from the third operation unit 6 is fed to a right speaker (not shown). Consequently, a listener can listen to an amplified acoustic image.
  • the first input signal is taken as a left channel input signal Lin
  • the second input signal is taken as a right channel input signal Rin
  • the first input signal may be taken as a right channel input signal Rin
  • the second input signal may be taken as a left channel input signal Lin.
  • the first output signal becomes a right channel output signal Rout
  • the second output signal becomes a left channel output signal Lout.

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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)
EP00931572A 1999-05-28 2000-05-25 Stereoakustischer bildverstärker Withdrawn EP1189483A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP15047399 1999-05-28
JP11150473A JP2000341798A (ja) 1999-05-28 1999-05-28 ステレオ音像拡大装置
PCT/JP2000/003379 WO2000074439A1 (fr) 1999-05-28 2000-05-25 Amplificateur d'image stéréo-acoustique

Publications (1)

Publication Number Publication Date
EP1189483A1 true EP1189483A1 (de) 2002-03-20

Family

ID=15497683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00931572A Withdrawn EP1189483A1 (de) 1999-05-28 2000-05-25 Stereoakustischer bildverstärker

Country Status (5)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140205100A1 (en) * 2011-09-19 2014-07-24 Huawei Technologies Co., Ltd. Method and an apparatus for generating an acoustic signal with an enhanced spatial effect
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

Families Citing this family (1)

* 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

Family Cites Families (3)

* 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
US5692050A (en) * 1995-06-15 1997-11-25 Binaura Corporation Method and apparatus for spatially enhancing stereo and monophonic signals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0074439A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140205100A1 (en) * 2011-09-19 2014-07-24 Huawei Technologies Co., Ltd. Method and an apparatus for generating an acoustic signal with an enhanced spatial effect
EP2759148A1 (de) * 2011-09-19 2014-07-30 Huawei Technologies Co., Ltd. Verfahren und vorrichtung zur erzeugung eines akustischen signals mit verbessertem räumlichem effekt
EP2759148A4 (de) * 2011-09-19 2014-10-08 Huawei Tech Co Ltd Verfahren und vorrichtung zur erzeugung eines akustischen signals mit verbessertem räumlichem effekt
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

Also Published As

Publication number Publication date
CN1353917A (zh) 2002-06-12
KR100563499B1 (ko) 2006-03-28
WO2000074439A1 (fr) 2000-12-07
JP2000341798A (ja) 2000-12-08
KR20020003571A (ko) 2002-01-12

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