WO2018020084A1 - Nouveau procédé d'amélioration de la diffusion des basses fréquences musicales en fonction du niveau d'écoute - Google Patents
Nouveau procédé d'amélioration de la diffusion des basses fréquences musicales en fonction du niveau d'écoute Download PDFInfo
- Publication number
- WO2018020084A1 WO2018020084A1 PCT/FR2017/000147 FR2017000147W WO2018020084A1 WO 2018020084 A1 WO2018020084 A1 WO 2018020084A1 FR 2017000147 W FR2017000147 W FR 2017000147W WO 2018020084 A1 WO2018020084 A1 WO 2018020084A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- level
- low frequencies
- sound
- low
- microphone
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000009792 diffusion process Methods 0.000 title 1
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000006870 function Effects 0.000 description 3
- PSFDQSOCUJVVGF-UHFFFAOYSA-N harman Chemical compound C12=CC=CC=C2NC2=C1C=CN=C2C PSFDQSOCUJVVGF-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
-
- 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
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/01—Transducers used as a loudspeaker to generate sound aswell as a microphone to detect sound
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/307—Frequency adjustment, e.g. tone control
Definitions
- the maximum listening level allowed by the law is 105 dB. It is naturally always reached and often exceeded. Also, the creators of modern music mix their works to be listened to at this level.
- HIFI amplifiers are equipped with a way to increase them. This means is often a push button that increases them by a fixed value, which in general does not correspond to the value required by the listening level.
- a more advanced system is to provide a progressive low frequency reading coupled with the volume knob.
- the company HARMAN in its US Pat. No. 7,016,509 has proposed a low frequency recording scheme based on the measurement of the level of the modulation signal which consists in effecting an increase in the level of the low frequencies inversely proportional to the level of the signal. modulation.
- the present invention is a new automatic and precise method for adjusting the relative level of the low frequencies as a function of the sound level comprising on the one hand a weighted sound level evaluation means and on the other hand a means of suppressing the increase. low frequencies in the absence of a modulation signal.
- the reproduction level is 70 dB and the reference level is 105 dB and we look for what gain to apply to the 40 Hz band.
- the table below shows the gain to be applied to the 20 Hz, 40 Hz, 80 Hz and 160 Hz bands at the 100 dB, 80 dB, 70 dB and 60 dB listening levels to maintain the apparent relative level. low frequencies. 20 Hz 40 Hz 80 Hz 160 Hz
- FIG. 1 is a general diagram of a device according to the method according to the present invention.
- a source of sound modulation 1 supplies a low-pass filter of order 1: 2.
- This filter supplies a voltage-controlled amplifier 3 which itself feeds a power amplifier 4 which is the sum between the signal from 3 and the signal from 1 and powers the speaker 5.
- the speaker thus emits a modulation which is the sum between the original modulation and the same original modulation filtered by a first-order low-pass filter whose level varies according to the sound pressure level emitted by the loudspeaker.
- a microphone 6 delivers a voltage proportional to the sound pressure in the environment of the listener. This signal is filtered by a weighting filter 7.
- the voltage from 7 is rectified by the rectifier without threshold 8.
- the DC voltage from 8 supplies the voltage configurator 9 responsible for developing a voltage able to drive the amplifier 3.
- the modulation from 1 is introduced into the circuit 10 arranged to control the circuit 9 the cancellation of the bass reading in the absence of signal at the output of the source 1.
- FIG. 1 the assembly of FIG. 1 provides a sound pressure proportional to:
- the amplifier 3 is a circuit THAT 2181 whose gain is equal to 1 when its control voltage is zero and which increases by 1 dB when its control voltage decreases by 0.006 volts.
- control voltage must be - 0.156 volts
- control voltage should be - 0.120 volts
- This device can equip sound reproduction equipment.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Quality & Reliability (AREA)
- Computational Linguistics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Circuit For Audible Band Transducer (AREA)
- Electrophonic Musical Instruments (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019504745A JP2019522441A (ja) | 2016-07-29 | 2017-07-27 | 音楽の低周波数の分散を改善する新しい方法 |
US16/321,050 US20190166425A1 (en) | 2016-07-29 | 2017-07-27 | Novel method for improving the diffusion of musical low frequencies according to the audio level |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1601171A FR3054756B1 (fr) | 2016-07-29 | 2016-07-29 | Procede d'ajustement du niveau des frequences basses musicales en fonction du niveau d'ecoute |
FR16/01171 | 2016-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018020084A1 true WO2018020084A1 (fr) | 2018-02-01 |
Family
ID=58737584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2017/000147 WO2018020084A1 (fr) | 2016-07-29 | 2017-07-27 | Nouveau procédé d'amélioration de la diffusion des basses fréquences musicales en fonction du niveau d'écoute |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190166425A1 (fr) |
JP (1) | JP2019522441A (fr) |
FR (1) | FR3054756B1 (fr) |
WO (1) | WO2018020084A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61192198A (ja) * | 1985-02-20 | 1986-08-26 | Fujitsu Ten Ltd | 聴感補正回路 |
JP2013143763A (ja) * | 2012-01-11 | 2013-07-22 | Susumu Taniguchi | ラウドネス補正手段と音質調整手段 |
US20140321670A1 (en) | 2013-04-26 | 2014-10-30 | Sony Corporation | Devices, Methods and Computer Program Products for Controlling Loudness |
WO2015141697A1 (fr) * | 2014-03-19 | 2015-09-24 | ヤマハ株式会社 | Dispositif de traitement de signal audio, et procédé de traitement de signal audio |
US9391575B1 (en) * | 2013-12-13 | 2016-07-12 | Amazon Technologies, Inc. | Adaptive loudness control |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4481662A (en) * | 1982-01-07 | 1984-11-06 | Long Edward M | Method and apparatus for operating a loudspeaker below resonant frequency |
SG144752A1 (en) * | 2007-01-12 | 2008-08-28 | Sony Corp | Audio enhancement method and system |
-
2016
- 2016-07-29 FR FR1601171A patent/FR3054756B1/fr active Active
-
2017
- 2017-07-27 US US16/321,050 patent/US20190166425A1/en not_active Abandoned
- 2017-07-27 WO PCT/FR2017/000147 patent/WO2018020084A1/fr active Application Filing
- 2017-07-27 JP JP2019504745A patent/JP2019522441A/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61192198A (ja) * | 1985-02-20 | 1986-08-26 | Fujitsu Ten Ltd | 聴感補正回路 |
JP2013143763A (ja) * | 2012-01-11 | 2013-07-22 | Susumu Taniguchi | ラウドネス補正手段と音質調整手段 |
US20140321670A1 (en) | 2013-04-26 | 2014-10-30 | Sony Corporation | Devices, Methods and Computer Program Products for Controlling Loudness |
US9391575B1 (en) * | 2013-12-13 | 2016-07-12 | Amazon Technologies, Inc. | Adaptive loudness control |
WO2015141697A1 (fr) * | 2014-03-19 | 2015-09-24 | ヤマハ株式会社 | Dispositif de traitement de signal audio, et procédé de traitement de signal audio |
EP3122074A1 (fr) * | 2014-03-19 | 2017-01-25 | Yamaha Corporation | Dispositif de traitement de signal audio, et procédé de traitement de signal audio |
Also Published As
Publication number | Publication date |
---|---|
FR3054756B1 (fr) | 2020-08-28 |
US20190166425A1 (en) | 2019-05-30 |
FR3054756A1 (fr) | 2018-02-02 |
JP2019522441A (ja) | 2019-08-08 |
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