EP0047281A1 - Selbsttätiger regler für die frequenzübertragungscharakteristik eines elektroakustischen übertragungsweges - Google Patents
Selbsttätiger regler für die frequenzübertragungscharakteristik eines elektroakustischen übertragungswegesInfo
- Publication number
- EP0047281A1 EP0047281A1 EP19810900641 EP81900641A EP0047281A1 EP 0047281 A1 EP0047281 A1 EP 0047281A1 EP 19810900641 EP19810900641 EP 19810900641 EP 81900641 A EP81900641 A EP 81900641A EP 0047281 A1 EP0047281 A1 EP 0047281A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filters
- correction
- frequency
- digital
- electroacoustic
- 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- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 230000001627 detrimental effect Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 8
- 230000001755 vocal effect Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012950 reanalysis Methods 0.000 description 1
- 238000012546 transfer Methods 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
-
- 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
Definitions
- the invention relates to the correction of frequency transmission faults of an electroacoustic channel including all or part of the capture, recording, transmission, processing, reproduction devices and the space where the reproduction of '' sound information, vocal or musical, high fidelity or not.
- electroacoustic installations have an irregular transmission of the frequencies of the audible spectrum, due to defects inherent in one or more electrical or acoustic elements, defects which can combine to lead to a very unfaithful reproduction of the signal to be transmitted, or even to a total loss of 'intelligibility (resonance, Larsen effect).
- Corrective devices known as parametric equalizers are already known which make it possible to correct the most important faults of this transmission exactly, provided that the frequency transmission curve provided by a second device, the analyzer, is available.
- the present invention aims to remedy these drawbacks.
- the invention as characterized in the claims, solves the problem of obtaining a frequency transmission of an electroacoustic installation which is equal over the whole spectrum audible, instantly and automatically.
- the corrector consists of a set of universal active filters, the parameters of which (central frequency, gain overvoltage coefficient and bandpass or hanger cutter nature), are adjustable by digital control.
- This numerical control is done by the intermediary of digital / analog converters multipliers, which, by multiplying by a coefficient, determined by a binary number with eight bits, the signal which is applied to them, modify the transfer function of these filters.
- the number of these filters is fixed according to the number of faults which one estimates to have to correct and the precision of the equalization which one wants to obtain, three being a commonly suitable number.
- Each of these filters also includes a set of analog switches, also controlled digitally, which make it possible to carry out either a configuration of notch filter or a configuration of bandpass filter, by performing the appropriate summations of the signals available on the filters. , according to the current technique of universal active filters.
- the filters are mounted in parallel and included in the electroacoustic channel which must be equalized.
- the present invention also includes an assembly performing a detection of the signal present at the output of the filters to which it is connected, also by means of a digitally controlled analog switch. The detected signal is digitized by an analog / digital converter, and thus gives the level of reproduction at the filter frequency.
- a source of " pink noise is also part of the device as it can be produced according to this description, and is used to apply to the electroacoustic path which must be equalized, a test signal. All these elements are placed under the control of '' a microprocessor-based calculator, comprising a central processing unit, read-only memories containing the software, random access memories serving as “notepads”, and sufficient input / output ports for the interface of all the commands of all the filters, to control the various switches, and to take into account the data coming from the system.
- the software defining the operation of the assembly after having received an execution order, switches everything into position, analysis, or allowing the injection of pink noise to the electroacoustic channel to be equalized before being between the injection point and the measurement point.
- All the frequencies are scanned by one of the filters and the values of measured voltages are put into RAM.
- the software determines the values the most deviated from an average value, the importance, the direction and the width of these faults, and assigns to each of the available filters, the values of central frequency, coefficient of -supervoltage, gain and the band-pass or band-cutter nature capable of eliminating this defect.
- the software then returns the assembly to the normal operating configuration.
- the present invention can be realized in the form of a complete product taking place among the various preexisting elements of the electroacoustic installation, or can be integrated as part of one of these elements, such as power amplifier, preamplifier or tape recorder, to improve performance.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8006283 | 1980-03-13 | ||
FR8006283A FR2478409A1 (fr) | 1980-03-13 | 1980-03-13 | Correcteur automatique des caracteristiques de transmission de frequence d'une voie electroacoustique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0047281A1 true EP0047281A1 (de) | 1982-03-17 |
Family
ID=9239908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810900641 Withdrawn EP0047281A1 (de) | 1980-03-13 | 1981-03-13 | Selbsttätiger regler für die frequenzübertragungscharakteristik eines elektroakustischen übertragungsweges |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0047281A1 (de) |
FR (1) | FR2478409A1 (de) |
WO (1) | WO1981002658A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1772783A (en) * | 1982-06-30 | 1984-01-26 | Loudspeakers, B &, Ltd. | Environment-adaptive loudspeaker systems |
US4559569A (en) * | 1983-03-08 | 1985-12-17 | Thomson-Brandt | Circuit arrangement for correcting frequency response in accordance with frequency response of a sound field |
JPH0663777B2 (ja) * | 1984-03-24 | 1994-08-22 | ソニー株式会社 | イコライザ装置 |
DE10105184A1 (de) | 2001-02-06 | 2002-08-29 | Bosch Gmbh Robert | Verfahren zum automatischen Einstellen eines digitalen Equalizers und Wiedergabeeinrichtung für Audiosignale zur Realisierung eines solchen Verfahrens |
DE10225146A1 (de) | 2002-06-06 | 2003-12-18 | Bosch Gmbh Robert | Verfahren zum Einstellen von Filterparametern und zugeordnetes Wiedergabesystem |
DE10225145A1 (de) * | 2002-06-06 | 2003-12-18 | Bosch Gmbh Robert | Verfahren zur gehörrichtigen Baßpegelanhebung und zugeordnetes Wiedergabesystem |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2413009A1 (fr) * | 1977-12-20 | 1979-07-20 | Oceanic | Systeme de correction acoustique automatique |
FR2457703A1 (fr) * | 1979-05-31 | 1980-12-26 | Rosset Didier | Egaliseur automatique de bandes passantes audiofrequences |
-
1980
- 1980-03-13 FR FR8006283A patent/FR2478409A1/fr active Granted
-
1981
- 1981-03-13 EP EP19810900641 patent/EP0047281A1/de not_active Withdrawn
- 1981-03-13 WO PCT/FR1981/000036 patent/WO1981002658A1/fr not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8102658A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2478409B1 (de) | 1983-12-23 |
WO1981002658A1 (fr) | 1981-09-17 |
FR2478409A1 (fr) | 1981-09-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT CH DE GB LU NL |
|
17P | Request for examination filed |
Effective date: 19820317 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: DESCLAUX, JEAN-FRANCOIS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19831003 |