WO2001001566A2 - Verfahren zur verarbeitung eines audiosignales - Google Patents
Verfahren zur verarbeitung eines audiosignales Download PDFInfo
- Publication number
- WO2001001566A2 WO2001001566A2 PCT/EP2000/004798 EP0004798W WO0101566A2 WO 2001001566 A2 WO2001001566 A2 WO 2001001566A2 EP 0004798 W EP0004798 W EP 0004798W WO 0101566 A2 WO0101566 A2 WO 0101566A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- input
- output
- linear circuit
- signal
- audio signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/165—Equalizers; Volume or gain control in limited frequency bands
-
- 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
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Definitions
- the invention relates to a method and a circuit arrangement for processing an audio signal which is present via a first path at the first input of a first adder.
- Such methods and circuit devices are used in devices for acoustic reproduction, such as. B.
- TV sets, radio receivers or stereo systems to compensate for the frequency response of the loudspeakers, to improve acoustic reproduction, and to prevent the device or system from being overdriven.
- the most critical link in an acoustic reproduction device is the loudspeaker, the sound pressure of which drops below a building-related cutoff frequency with about 40 db per decade, which corresponds to the transfer function of a second-order filter.
- Bass reflex and transmission line loudspeakers have transmission functions that correspond to a higher-order filter.
- the lower cut-off frequency is typically between about 50 Hz and 200 Hz. The lower the cut-off frequency of a loudspeaker, the more expensive it is to manufacture. Inexpensive devices such as B. televisions or portable radio receivers are therefore equipped with simpler loudspeakers whose lower cut-off frequency is relatively high.
- the cut-off frequency is shifted downwards by preamplifying the low frequencies, which, however, can lead to overloading of the power amplifier and the loudspeakers.
- the output signal of the bass amplifier is fed back in such a way that the amplification of the lower frequencies is reduced when the output signal is large.
- the signals at the output of the high pass are fed to the input of a generator for generating the harmonics of the fundamental frequency.
- the level of the signals at the output of the generator is attenuated to a value that is below the level of the original audio signal. This attenuated signal and the original audio signal are added together.
- a so-called synthesizer is known from US Pat. No. 4,700,390, in which the harmonics are generated for both the lower and the higher frequencies and are added to the original audio signal in order to achieve better reproduction in both the low and the high frequency range.
- US Pat. No. 5,771,296 also discloses a circuit arrangement in which the audio signal is fed directly to an adder via a first path, while the harmonics of the lower frequencies are generated in a second path and are added to the original signal in the adder by a listener to pretend, to some extent, that a loudspeaker emits lower frequencies than it actually does
- the first exemplary embodiment of the circuit arrangement according to the invention shown in FIG. 1 describes and explains the method according to the invention.
- the audio signal Xm is connected via a first path P1 to the first input of a first adder AI and via a second path P2 which is connected in series from a first bandpass filter BPl, a first multiplier Ml, an amplifier AM with variable gain, a first nonlinear circuit NL1 and a second bandpass filter BP2 is constructed, fed to the second input of the adder AI, at the output of which the output audio signal Xout can be removed.
- a control output of the first non-linear circuit NL1 is connected to the input of a function generator F1, the output of which is connected to the first multiplier Ml.
- the audio signal X is band-limited by the first bandpass filter BP1.
- the audio signal is then multiplied by a variable correction factor GC in the multiplier Ml.
- the product at the output of the multiplier Ml is in the Amplifier AM amplified with the gain factor G.
- the non-linear circuit NL1 limits the amplitude of the audio signal supplied by the amplifier AM to a predeterminable value.
- the output signal of the non-linear circuit NL1 is band-limited by means of the bandpass filter BP2.
- the non-linear circuit NL1 generates a control variable V, from which the function generator F1 generates the correction factor GC.
- This correction factor GC is changed by the function generator F1 as a function of the control variable V such that it is reduced in the event of oversteer.
- the correction actuator GC is increased by the function generator F1, but at most up to the value 1.
- FIG. 2 The second exemplary embodiment of the invention shown in FIG. 2 will now be described and explained together with the first exemplary embodiment from FIG. 1.
- the function generator F1 is implemented as a low-pass filter TP1 and the first non-linear circuit NL1 as a limiter, which cuts off the signal amplitude above a predefinable threshold value.
- the non-linear circuit NL1 If the signal amplitude exceeds the predefined threshold value, the non-linear circuit NL1 outputs the control variable V with the negative value VI to the low-pass filter TP1, while if the signal amplitude is below the predefined threshold value, it sends a control variable V with a positive value V2 generated.
- the correction factor GC for the multiplier M1 is generated by filtering the control variable V by means of the low-pass filter TP1.
- the nonlinear operation in the nonlinear circuit NL1 which limits the amplitudes of the audio signal to a predefinable threshold value, generates audio signals with the lower frequencies, which are also called harmonics of the bass signal.
- the shape of these harmonics is determined by the LO NJ NHP 1
- Function generator F2 supplied, the output of which is connected to the control input of the non-linear circuit NL2.
- the signal output of the non-linear circuit NL2 is connected to the input of the bandpass BP2, while the control output of the non-linear circuit NL2 is connected to the
- the non-linear circuit NL2 continuously generates harmonics of the low-frequency components of the audio signal, which are weighted by the function generator F2 with the variable factor NG, which is a function of the output signal. Depending on the selection of the function of the function generator F2, various acoustic effects can be generated.
- the function generator F2 can, for example, be designed in such a way that harmonics are increasingly generated in the non-linear circuit NL2 as soon as the signal amplitude has to be limited in order to counteract an overload. This measure distributes the signal energy to the high-frequency harmonics, which can better be reproduced by a loudspeaker or a loudspeaker system. Although the energy of the lower-frequency signal components is now reduced, the listener nevertheless has the impression of a full bass sound due to the psychoacoustic effects already mentioned.
- FIG. 4 shows an exemplary structure of the non-open circuit NL2 and an exemplary structure of the function generator F2 in detail.
- the input signal of the non-linear circuit NL1, the output signal of the amplifier AM, is at the first input of an adder A2, at the input of an absolute value generator ABS and at the input of a peak value detector PK, the output of which is connected to the input of a low-pass filter TP2 and a low-pass filter.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Circuit For Audible Band Transducer (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50013195T DE50013195D1 (de) | 1999-06-23 | 2000-05-26 | Verfahren zur verarbeitung eines audiosignales |
JP2001506130A JP4410445B2 (ja) | 1999-06-23 | 2000-05-26 | 音声信号を処理する方法 |
EP00929555A EP1192837B1 (de) | 1999-06-23 | 2000-05-26 | Verfahren zur verarbeitung eines audiosignales |
US10/030,521 US7317800B1 (en) | 1999-06-23 | 2000-05-26 | Apparatus and method for processing an audio signal to compensate for the frequency response of loudspeakers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19928420A DE19928420A1 (de) | 1999-06-23 | 1999-06-23 | Verfahren zur Verarbeitung eines Audiosignals |
DE19928420.2 | 1999-06-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001001566A2 true WO2001001566A2 (de) | 2001-01-04 |
WO2001001566A3 WO2001001566A3 (de) | 2001-07-26 |
Family
ID=7912052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/004798 WO2001001566A2 (de) | 1999-06-23 | 2000-05-26 | Verfahren zur verarbeitung eines audiosignales |
Country Status (8)
Country | Link |
---|---|
US (1) | US7317800B1 (de) |
EP (1) | EP1192837B1 (de) |
JP (1) | JP4410445B2 (de) |
KR (1) | KR100651093B1 (de) |
CN (1) | CN1199518C (de) |
AT (1) | ATE333775T1 (de) |
DE (2) | DE19928420A1 (de) |
WO (1) | WO2001001566A2 (de) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1428411B2 (de) † | 2001-09-21 | 2011-11-30 | Gigaset Communications GmbH | Verfahren und vorrichtung zur steuerung der basswiedergabe von audiosignalen in elektroakustischen wandlern |
JP4371268B2 (ja) | 2003-12-18 | 2009-11-25 | シチズンホールディングス株式会社 | 指向性スピーカーの駆動方法および指向性スピーカー |
NZ532572A (en) * | 2004-04-26 | 2006-10-27 | Phitek Systems Ltd | Audio signal processing for generating apparent bass through harmonics |
US7508948B2 (en) * | 2004-10-05 | 2009-03-24 | Audience, Inc. | Reverberation removal |
FR2888286B1 (fr) * | 2005-07-07 | 2007-08-17 | Renault Sas | Dispositif et procede de traitement d'un signal de mesure de pression d'une chambre de combustion d'un moteur a combustion interne |
US8150069B2 (en) * | 2006-03-31 | 2012-04-03 | Sony Corporation | Signal processing apparatus, signal processing method, and sound field correction system |
JP4666229B2 (ja) * | 2006-10-18 | 2011-04-06 | ソニー株式会社 | オーディオ再生装置 |
CN101174819B (zh) * | 2006-11-02 | 2012-06-27 | 晨星半导体股份有限公司 | 无限脉冲响应滤波的理想均衡器及理想等化方法 |
JP5399271B2 (ja) * | 2007-03-09 | 2014-01-29 | ディーティーエス・エルエルシー | 周波数ワープオーディオ等化器 |
JP2008263583A (ja) * | 2007-03-16 | 2008-10-30 | Sony Corp | 低域増強方法、低域増強回路および音響再生システム |
JP5046786B2 (ja) * | 2007-08-10 | 2012-10-10 | 三菱電機株式会社 | 擬似重低音生成装置 |
WO2009030235A1 (en) * | 2007-09-03 | 2009-03-12 | Am3D A/S | Method and device for extension of low frequency output from a loudspeaker |
JP2010183126A (ja) * | 2009-02-03 | 2010-08-19 | Foster Electric Co Ltd | 音響再生装置および音響再生システム |
US8532803B2 (en) * | 2009-03-06 | 2013-09-10 | Lg Electronics Inc. | Apparatus for processing an audio signal and method thereof |
US9307321B1 (en) | 2011-06-09 | 2016-04-05 | Audience, Inc. | Speaker distortion reduction |
US9247342B2 (en) | 2013-05-14 | 2016-01-26 | James J. Croft, III | Loudspeaker enclosure system with signal processor for enhanced perception of low frequency output |
EP3811515B1 (de) | 2018-06-22 | 2022-07-27 | Dolby Laboratories Licensing Corporation | Mehrkanalige audioverbesserung, dekodierung und wiedergabe als reaktion auf feedback |
CN111208478B (zh) * | 2020-01-10 | 2023-05-12 | 深圳市中科海信科技有限公司 | 用于导航雷达回波积累的双极点积累器及回波积累方法 |
US11032642B1 (en) * | 2020-03-10 | 2021-06-08 | Nuvoton Technology Corporation | Combined frequency response and dynamic range correction for loudspeakers |
US11317203B2 (en) | 2020-08-04 | 2022-04-26 | Nuvoton Technology Corporation | System for preventing distortion of original input signal |
Citations (4)
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US5359665A (en) * | 1992-07-31 | 1994-10-25 | Aphex Systems, Ltd. | Audio bass frequency enhancement |
US5668885A (en) * | 1995-02-27 | 1997-09-16 | Matsushita Electric Industrial Co., Ltd. | Low frequency audio conversion circuit |
WO1997042789A1 (en) * | 1996-05-08 | 1997-11-13 | Philips Electronics N.V. | Circuit, audio system and method for processing signals, and a harmonics generator |
WO1999026454A1 (en) * | 1997-11-17 | 1999-05-27 | Srs Labs, Inc. | Low-frequency audio simulation system |
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US4000370A (en) * | 1975-05-16 | 1976-12-28 | Shure Brothers Incorporated | Line level microphone with built in limiter |
US4150253A (en) | 1976-03-15 | 1979-04-17 | Inter-Technology Exchange Ltd. | Signal distortion circuit and method of use |
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JPS5922419A (ja) * | 1982-07-28 | 1984-02-04 | Matsushita Electric Ind Co Ltd | 高調波合成回路 |
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DE3782959T2 (de) * | 1986-04-01 | 1993-06-24 | Matsushita Electric Ind Co Ltd | Erzeuger von niederfrequenten toenen. |
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US6952585B1 (en) | 1997-11-19 | 2005-10-04 | Ericsson Inc. | Multi-channel communication system for wireless local loop communication |
-
1999
- 1999-06-23 DE DE19928420A patent/DE19928420A1/de not_active Ceased
-
2000
- 2000-05-26 CN CNB008106282A patent/CN1199518C/zh not_active Expired - Fee Related
- 2000-05-26 KR KR1020017016499A patent/KR100651093B1/ko not_active IP Right Cessation
- 2000-05-26 EP EP00929555A patent/EP1192837B1/de not_active Expired - Lifetime
- 2000-05-26 AT AT00929555T patent/ATE333775T1/de not_active IP Right Cessation
- 2000-05-26 DE DE50013195T patent/DE50013195D1/de not_active Expired - Lifetime
- 2000-05-26 JP JP2001506130A patent/JP4410445B2/ja not_active Expired - Fee Related
- 2000-05-26 WO PCT/EP2000/004798 patent/WO2001001566A2/de active IP Right Grant
- 2000-05-26 US US10/030,521 patent/US7317800B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US5359665A (en) * | 1992-07-31 | 1994-10-25 | Aphex Systems, Ltd. | Audio bass frequency enhancement |
US5668885A (en) * | 1995-02-27 | 1997-09-16 | Matsushita Electric Industrial Co., Ltd. | Low frequency audio conversion circuit |
WO1997042789A1 (en) * | 1996-05-08 | 1997-11-13 | Philips Electronics N.V. | Circuit, audio system and method for processing signals, and a harmonics generator |
WO1999026454A1 (en) * | 1997-11-17 | 1999-05-27 | Srs Labs, Inc. | Low-frequency audio simulation system |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 008, no. 107 (E-245), 19. Mai 1984 (1984-05-19) & JP 59 022419 A (MATSUSHITA DENKI SANGYO KK), 4. Februar 1984 (1984-02-04) * |
Also Published As
Publication number | Publication date |
---|---|
KR20020019468A (ko) | 2002-03-12 |
WO2001001566A3 (de) | 2001-07-26 |
DE19928420A1 (de) | 2000-12-28 |
EP1192837A2 (de) | 2002-04-03 |
CN1199518C (zh) | 2005-04-27 |
DE50013195D1 (de) | 2006-08-31 |
CN1362001A (zh) | 2002-07-31 |
US7317800B1 (en) | 2008-01-08 |
EP1192837B1 (de) | 2006-07-19 |
JP2003503868A (ja) | 2003-01-28 |
KR100651093B1 (ko) | 2006-11-29 |
ATE333775T1 (de) | 2006-08-15 |
JP4410445B2 (ja) | 2010-02-03 |
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