EP1251717A1 - Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer - Google Patents

Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer Download PDF

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Publication number
EP1251717A1
EP1251717A1 EP01810373A EP01810373A EP1251717A1 EP 1251717 A1 EP1251717 A1 EP 1251717A1 EP 01810373 A EP01810373 A EP 01810373A EP 01810373 A EP01810373 A EP 01810373A EP 1251717 A1 EP1251717 A1 EP 1251717A1
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EP
European Patent Office
Prior art keywords
signal
delayed
right channel
left channel
channel signal
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Withdrawn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
EP01810373A
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English (en)
French (fr)
Inventor
Valentin Chareyron
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.)
Yellowknife AVV
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Yellowknife AVV
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 Yellowknife AVV filed Critical Yellowknife AVV
Priority to EP01810373A priority Critical patent/EP1251717A1/de
Priority to US10/475,194 priority patent/US7254238B2/en
Priority to EP02708120A priority patent/EP1380188A1/de
Priority to JP2002582660A priority patent/JP2004527961A/ja
Priority to PCT/CH2002/000192 priority patent/WO2002085067A1/fr
Publication of EP1251717A1 publication Critical patent/EP1251717A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H04S1/005—For headphones

Definitions

  • the present invention relates to electronic devices intended for the sound reproduction. It relates, more particularly, to a method and a circuit specially designed to adapt the signals of different channels delivered by an audio reproduction system under the specific conditions of listening to them through headphones.
  • the invention applies equally well to the processing of right channel signals and of the left channel of a stereophonic reproduction system than that of channel signals of a multi-channel system such as, for example, that the system known as "Surround".
  • Existing audio reproduction systems are designed for listening with one enclosure per channel adequately placed in a room.
  • the two speakers are ideally located at the base of an equilateral triangle whose listener occupies a vertex.
  • the two earphones are placed at the immediate vicinity of the listener's ears. His brain goes like this simply perceive the sound sources reproduced on a crossing line his head from ear to ear, completely ignoring an essential part of the audio reproduction system, namely the volume of air located between each pregnant and the listener. This therefore does not correspond to the listening conditions by speakers and does not allow the correct reproduction of the sound image.
  • the method of reproduction itself operates, in fact, two channels per channel, the channel direct, from the enclosure to the nearest ear, and the indirect route, from the speaker to the most distant ear (four-way stereo).
  • the sounds of the indirect channels have longer paths and are therefore perceived with a certain delay.
  • the path length difference is about 7 cm, which results in a phase shift of 206 ⁇ s.
  • the object of the present invention is to provide a method and a circuit which provide optimal listening conditions for hearing headphones.
  • the first delay is between 100 and 200 ⁇ s
  • the second delay between 500 and 700 ⁇ s.
  • the delayed signal intended for the channel left and the delayed signal for the right channel are filtered beforehand in a way that favors low frequencies at the expense of high ones.
  • the filtering action is zero at 0 Hz and total at 24 kHz.
  • the first attenuation is advantageously between 20 and 30%, and the second attenuation between 50 and 60%.
  • the first attenuation is advantageously between 5 and 15%, and the second attenuation between 65 and 75%.
  • an audio source has been represented diagrammatically stereophonic S, conventional type, with two outputs 10 and 12 deliver the signal of the left channel L and the signal of the right channel respectively R.
  • the circuit 14 is, in fact, a microprocessor. Consequently, it goes without saying that the L and R signals applied to its inputs are in the form digital. The description of the processing of these signals will therefore refer to operations, not electronic components. The numbers of reference of these operations will be assigned the letter L when it comes to left channel and the letter R when it is the right channel.
  • the first operations performed on the L and R signals are, on the one hand, at 20, their passage through a low-pass filter and, on the other hand, at 22, their 25% attenuation.
  • the filtering operation carried out in 20 aims to promote frequencies low at the expense of high. This action is not essential but it contributes to improving the desired effect. Typically, the action of the filter is zero at 0 Hz then it gradually increases to 24 kHz, frequency for which its action is total.
  • the two filtered signals then undergo, at 24, an attenuation of 55% then are delayed, in 26, by 146 ⁇ s. For a sampling frequency of 48 kHz, this delay corresponds to an offset of 7 signal samples.
  • Signal R-45d thus attenuated to 45% of its initial level and delayed by 146 ⁇ s, is then added, in 28L, to the L-75 signal attenuated to 75% of its level initial, but not delayed, to obtain an intermediate left channel signal composite L1.
  • the signal L-45d attenuated to 45% of its initial level and delayed by 146 ⁇ s, is added, at 28R, to signal R-75 attenuated to 75% of its original level, but not delayed, to obtain a signal composite intermediate channel R1.
  • the signal R1-30d thus attenuated to 30% of its initial level and delayed by 583 ⁇ s, is then added, in 36L, to the L1-90 signal attenuated to 90% of its level initial, but not delayed, to obtain a composite signal Lc which appears on the output 16 and constitutes the signal of the left channel intended for listening by helmet.
  • the signal L1-30d attenuated to 30% of its initial and delayed level of 583 ⁇ s, is added, in 36R, to signal R1-90 attenuated to 90% of its original level, but not delayed, to obtain a signal composite Rc which appears on the output 20 and constitutes the signal of the right channel intended for headphone listening.
  • the circuit according to the invention performs two treatments successive signals, i.e. the transformation of the starting signals L and R into signals L1 and R1 (stage 14a), then the transformation of these into Lc and Rc signals (stage 14b).
  • these two treatments will be designated respectively azimuth and outsourcing.
  • FIGS 2 and 3 respectively show the effect of azimuth and that of outsourcing.
  • These figures represent the head 40 of a helmet wearer whose headphones on the left and right are designated by the references 42L and 42R.
  • the azimuth processing of the L and R signals results, like the shows figure 2, to substitute, for the two physical sound sources that constitute the 42L and 42R headphones, two virtual sound sources 44L and 44R positioned in front of the helmet wearer's eyes, at the tops of the base of an equilateral triangle whose opposite side is substantially located between both ears.
  • the stereophonic image perceived by the listener develops over 60 °, which corresponds to the conditions, generally accepted as the most comfortable, listening through speakers.
  • the outsourcing processing of the L1 and R1 signals results, like the shows figure 3, to move away the two virtual sound sources 44L and 44R from the listener's front and replace them with sources 46L and 46R.
  • the sound sources are no longer simply in the ears of the wearer of the helmet, of which they then cross the head without succeeding in generating the image desired stereo, but they are moved in front of him, at a distance distance and at an angle that provide listening conditions satisfactory stereophonic.
  • the invention applies, in general, to any hearing with the headphones, that it is, in particular, listening to music or to better separate, in an airplane cockpit, the different sources of messages.
  • the invention can also find an interesting application in the speech therapy field by allowing customization of amplification of sound signals to compensate for certain deficiencies hearing.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
EP01810373A 2001-04-17 2001-04-17 Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer Withdrawn EP1251717A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01810373A EP1251717A1 (de) 2001-04-17 2001-04-17 Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer
US10/475,194 US7254238B2 (en) 2001-04-17 2002-04-05 Method and circuit for headset listening of an audio recording
EP02708120A EP1380188A1 (de) 2001-04-17 2002-04-05 Verfahren und schaltung zum anhören einer audio-aufzeichnung mit kopfhörer
JP2002582660A JP2004527961A (ja) 2001-04-17 2002-04-05 音響録音媒体をヘッドセットで聴くための方法及び回路
PCT/CH2002/000192 WO2002085067A1 (fr) 2001-04-17 2002-04-05 Procede et circuit pour l'ecoute au casque d'un enregistrement audio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01810373A EP1251717A1 (de) 2001-04-17 2001-04-17 Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer

Publications (1)

Publication Number Publication Date
EP1251717A1 true EP1251717A1 (de) 2002-10-23

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP01810373A Withdrawn EP1251717A1 (de) 2001-04-17 2001-04-17 Verfahren und Schaltung zum anhören einer Audio-Aufzeichnung mit Kopfhörer
EP02708120A Withdrawn EP1380188A1 (de) 2001-04-17 2002-04-05 Verfahren und schaltung zum anhören einer audio-aufzeichnung mit kopfhörer

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP02708120A Withdrawn EP1380188A1 (de) 2001-04-17 2002-04-05 Verfahren und schaltung zum anhören einer audio-aufzeichnung mit kopfhörer

Country Status (4)

Country Link
US (1) US7254238B2 (de)
EP (2) EP1251717A1 (de)
JP (1) JP2004527961A (de)
WO (1) WO2002085067A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101517A1 (de) * 2008-03-14 2009-09-16 Am3D A/S Audioprozessor zur Umwandlung eines Monosignals in ein Stereosignal

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100612024B1 (ko) * 2004-11-24 2006-08-11 삼성전자주식회사 비대칭성을 이용하여 가상 입체 음향을 생성하는 장치 및그 방법과 이를 수행하기 위한 프로그램이 기록된 기록매체
US20140362996A1 (en) * 2013-05-08 2014-12-11 Max Sound Corporation Stereo soundfield expander
US20150036826A1 (en) * 2013-05-08 2015-02-05 Max Sound Corporation Stereo expander method
US20150036828A1 (en) * 2013-05-08 2015-02-05 Max Sound Corporation Internet audio software method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359605A (en) * 1979-11-01 1982-11-16 Victor Company Of Japan, Ltd. Monaural signal to artificial stereo signals convertings and processing circuit for headphones
DE3233990A1 (de) * 1982-09-14 1984-03-15 Paul Dipl.-Ing. Dr.-Ing. 5100 Aachen Scherer Verfahren zur beeinflussung der ausdehnung und lage einer phantomschallquelle bei mehrkanaliger lautsprecherwiedergabe
GB2220818A (en) * 1988-07-15 1990-01-17 Gary Keith Henry Stereo systems
US5033086A (en) * 1988-10-24 1991-07-16 AKG Akustische u. Kino-Gerate Gesellschaft m.b.H Stereophonic binaural recording or reproduction method
US5371799A (en) * 1993-06-01 1994-12-06 Qsound Labs, Inc. Stereo headphone sound source localization system
WO1998059525A2 (en) * 1997-06-24 1998-12-30 Be4 Ltd. System for producing an artificial sound environment
JPH11205892A (ja) * 1998-01-19 1999-07-30 Sony Corp オーディオ再生装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578854A (en) * 1976-02-27 1980-11-12 Victor Company Of Japan Stereophonic sound reproduction system
JPS6419900A (en) * 1987-07-14 1989-01-23 Nec Corp Synthesizing circuit for headphone sound field signal
JPS6419900U (de) 1987-07-24 1989-01-31
US4910779A (en) * 1987-10-15 1990-03-20 Cooper Duane H Head diffraction compensated stereo system with optimal equalization
US5105462A (en) * 1989-08-28 1992-04-14 Qsound Ltd. Sound imaging method and apparatus
DE69319456T2 (de) * 1992-01-30 1999-03-25 Matsushita Electric Ind Co Ltd Schallfeldsteuerungssystem
DE69433258T2 (de) * 1993-07-30 2004-07-01 Victor Company of Japan, Ltd., Yokohama Raumklangsignalverarbeitungsvorrichtung
US5761315A (en) * 1993-07-30 1998-06-02 Victor Company Of Japan, Ltd. Surround signal processing apparatus
JP2988289B2 (ja) * 1994-11-15 1999-12-13 ヤマハ株式会社 音像音場制御装置
EP0724378B1 (de) * 1995-01-25 2005-11-23 Victor Company Of Japan, Limited Verarbeitungsvorrichtung für Raumklangsignale
JP3577798B2 (ja) * 1995-08-31 2004-10-13 ソニー株式会社 ヘッドホン装置
US6850621B2 (en) * 1996-06-21 2005-02-01 Yamaha Corporation Three-dimensional sound reproducing apparatus and a three-dimensional sound reproduction method
US6449368B1 (en) * 1997-03-14 2002-09-10 Dolby Laboratories Licensing Corporation Multidirectional audio decoding
US6078669A (en) * 1997-07-14 2000-06-20 Euphonics, Incorporated Audio spatial localization apparatus and methods
JP3513850B2 (ja) * 1997-11-18 2004-03-31 オンキヨー株式会社 音像定位処理装置および方法
JP2000041294A (ja) * 1998-07-23 2000-02-08 Sony Corp ヘッドホンおよびその送信回路

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359605A (en) * 1979-11-01 1982-11-16 Victor Company Of Japan, Ltd. Monaural signal to artificial stereo signals convertings and processing circuit for headphones
DE3233990A1 (de) * 1982-09-14 1984-03-15 Paul Dipl.-Ing. Dr.-Ing. 5100 Aachen Scherer Verfahren zur beeinflussung der ausdehnung und lage einer phantomschallquelle bei mehrkanaliger lautsprecherwiedergabe
GB2220818A (en) * 1988-07-15 1990-01-17 Gary Keith Henry Stereo systems
US5033086A (en) * 1988-10-24 1991-07-16 AKG Akustische u. Kino-Gerate Gesellschaft m.b.H Stereophonic binaural recording or reproduction method
US5371799A (en) * 1993-06-01 1994-12-06 Qsound Labs, Inc. Stereo headphone sound source localization system
WO1998059525A2 (en) * 1997-06-24 1998-12-30 Be4 Ltd. System for producing an artificial sound environment
JPH11205892A (ja) * 1998-01-19 1999-07-30 Sony Corp オーディオ再生装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 198 (E - 756) 11 May 1989 (1989-05-11) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101517A1 (de) * 2008-03-14 2009-09-16 Am3D A/S Audioprozessor zur Umwandlung eines Monosignals in ein Stereosignal

Also Published As

Publication number Publication date
JP2004527961A (ja) 2004-09-09
US20040146166A1 (en) 2004-07-29
EP1380188A1 (de) 2004-01-14
WO2002085067A1 (fr) 2002-10-24
US7254238B2 (en) 2007-08-07

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