EP2551845B1 - Noise reducing sound reproduction - Google Patents
Noise reducing sound reproduction Download PDFInfo
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- EP2551845B1 EP2551845B1 EP11175344.8A EP11175344A EP2551845B1 EP 2551845 B1 EP2551845 B1 EP 2551845B1 EP 11175344 A EP11175344 A EP 11175344A EP 2551845 B1 EP2551845 B1 EP 2551845B1
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Classifications
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- 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
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- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
Definitions
- a noise reducing sound reproduction system and, in particular, a noise reduction system which includes an earphone for allowing a user to enjoy, for example, reproduced music or the like, with reduced ambient noise.
- active noise reduction systems also known as active noise cancellation/control (ANC) systems
- the same loudspeakers in particular loudspeakers arranged in the two earphones of headphones
- ANC active noise cancellation/control
- the same loudspeakers are often used for both noise reduction and reproduction of desirable sound such as music or speech.
- common noise reduction systems reduce the desirable sound to a certain degree, as well. Accordingly, either advanced electrical signal processing is required to compensate for this effect or the listener has to accept sound impressions that differ, depending on whether noise reduction is on or off.
- GAN W S ET AL "AN INTEGRATED AUDIO AND ACTIVE NOISE CONTROL HEADSETS", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS; IEEE SERVICE CENTER, NEW YORK, NY,US, vol. 48, no. 2, 1 May 2002 (2002-05-01), pages 242-247 , describes an integrated audio and active noise headset.
- US2010/329473A1 discloses detecting a change in power of an output signal of a filter and controlling the filter dependent thereon.
- EP1947642A1 discloses active noise control that employs a reference sound to adapt noise control.
- a noise reducing sound reproduction system comprising: a loudspeaker that is connected to a loudspeaker input path; a microphone that is acoustically coupled to the loudspeaker via a secondary path and connected to a microphone output path; a first subtractor that is connected downstream of the microphone output path and a first useful-signal path; an active noise reduction filter that is connected downstream of the first subtractor; and a second subtractor that is connected downstream of the active noise reduction filter, downstream of second useful-signal path, and upstream of the loudspeaker input path.
- the secondary path has a secondary path transfer characteristic.
- Both useful-signal paths are supplied with a useful signal to be reproduced and at least one of the useful-signal paths comprise one or more spectrum shaping filters.
- At least one of the spectrum shaping filters has a transfer characteristic that models the secondary path transfer characteristic.
- the first useful-signal path comprises the at least one spectrum shaping filter and the at least one spectrum shaping filter that models the secondary path transfer characteristic linearizes a microphone signal on the microphone output path with regard to the useful signal.
- the at least one spectrum shaping filter that models the secondary path transfer characteristic comprises at least two sub-filters. One of the sub-filters of the at least one spectrum shaping filter that models the secondary path transfer characteristic is a treble cut shelving filter.
- a noise reducing sound reproduction method in which: an input signal is supplied to a loudspeaker by which it is acoustically radiated; the signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path that has a secondary path transfer characteristic and that provides a microphone output signal; from the microphone output signal a useful-signal is subtracted to generate a filter input signal; the filter input signal is filtered in an active noise reduction filter to generate an error signal; and the useful-signal is subtracted from the error signal to generate the loudspeaker input signal; and the useful-signal is filtered by one or more spectrum shaping filters prior to subtraction from the microphone output signal.
- At least one of the spectrum shaping filters has a transfer characteristic that models the secondary path transfer characteristic.
- the useful signal prior to subtraction from the microphone output signal, is filtered with the transfer characteristic of the at least one spectrum shaping filter that models the secondary path transfer characteristic, wherein the at least one spectrum shaping filter that models the secondary path transfer characteristic linearizes a microphone signal on the microphone output path with regard to the useful signal.
- the filtering of the useful signal includes treble cut shelving filtering.
- Feedback ANC systems are intended to reduce or even cancel a disturbing signal, such as noise, by providing at a listening site a noise reducing signal that ideally has the same amplitude over time but the opposite phase compared to the noise signal.
- a noise reducing signal that ideally has the same amplitude over time but the opposite phase compared to the noise signal.
- the noise signal and the noise reducing signal By superimposing the noise signal and the noise reducing signal, the resulting signal, also known as error signal, ideally tends toward zero.
- the quality of the noise reduction depends on the quality of a so-called secondary path, i.e., the acoustic path between a loudspeaker and a microphone representing the listener's ear.
- the quality of the noise reduction further depends on the quality of a so-called ANC filter that is connected between the microphone and the loudspeaker and that filters the error signal provided by the microphone such that, when the filtered error signal is reproduced by the loudspeaker, it further reduces the error signal.
- ANC filter that is connected between the microphone and the loudspeaker and that filters the error signal provided by the microphone such that, when the filtered error signal is reproduced by the loudspeaker, it further reduces the error signal.
- problems occur when additionally to the filtered error signal a useful signal such as music or speech is provided at the listening site, in particular by the loudspeaker that also reproduces the filtered error signal. Then, the useful signal may be deteriorated by the system as previously mentioned.
- the loudspeaker and the microphone may be part of an acoustic sub-system (e.g., a loudspeaker-room-microphone system) having an input stage formed by the loudspeaker 3 and an output stage formed by the microphone; the sub-system being supplied with an electrical input signal and providing an electrical output signal.
- acoustic sub-system e.g., a loudspeaker-room-microphone system
- the loudspeaker and the microphone may be part of an acoustic sub-system (e.g., a loudspeaker-room-microphone system) having an input stage formed by the loudspeaker 3 and an output stage formed by the microphone; the sub-system being supplied with an electrical input signal and providing an electrical output signal.
- “Path” means in this regard an electrical or acoustical connection that may include further elements such as signal conducting means, amplifiers, filters, etc.
- a spectrum shaping filter is a filter in which the spectra of the input and output signal are different over frequency.
- FIG. 1 is a block diagram illustrating a general feedback type active noise reduction (ANC) system in which a disturbing signal d[n], also referred to as noise signal, is transferred (radiated) to a listening site, e.g., a listener's ear, via a primary path 1.
- the primary path 1 has a transfer characteristic of P(z).
- an input signal v[n] is transferred (radiated) from a loudspeaker 3 to the listening site via a secondary path 2.
- the secondary path 2 has a transfer characteristic of S(z).
- a microphone 4 positioned at the listening site receives together with the disturbing signal d[n] the signals that arise from the loudspeaker 3.
- the microphone 4 provides a microphone output signal y[n] that represents the sum of these received signals.
- the microphone output signal y[n] is supplied as filter input signal u[n] to an ANC filter 5 that outputs to an adder 6 an error signal e[n].
- the ANC filter 5, which may be an adaptive filter, has a transfer characteristic of W(z).
- the adder 6 also receives an optionally pre-filtered, e.g., with a spectrum shaping filter (not shown in the drawings) useful signal x[n] such as music or speech and provides an input signal v[n] to the loudspeaker 3.
- the signals x[n], y[n], e[n], u[n] and v[n] are in the discrete time domain.
- their spectral representations X(z), Y(z), E(z), U(z) and V(z) are used.
- the useful signal transfer characteristic M(z) approaches 0 when the transfer characteristic W(z) of the ANC filter 5 increases, while the secondary path transfer function S(z) remains neutral, i.e. at levels around 1, i.e., 0[dB]. For this reason, the useful signal x[n] has to be adapted accordingly to ensure that the useful signal x[n] is apprehended identically by a listener when ANC is on or off. Furthermore, the useful signal transfer characteristic M(z) also depends on the transfer characteristic S(z) of the secondary path 2 to the effect that the adaption of the useful signal x[n] also depends on the transfer characteristic S(z) and its fluctuations due to aging, temperature, change of listener etc. so that a certain difference between "on” and "off” will be apparent.
- the useful signal x[n] is supplied to the acoustic sub-system (loudspeaker, room, microphone) at the adder 6 connected upstream of the loudspeaker 3, in the system of FIG. 2 the useful signal x[n] is supplied at the microphone 4. Therefore, in the system of FIG. 2 , the adder 6 is omitted and an adder 7 is arranged downstream of microphone 4 to sum up the, e.g., pre-filtered, useful signal x[n] and the microphone output signal y[n].
- M z W z ⁇ S z / 1 ⁇ W z ⁇ S z lim W z ⁇ S z ⁇ 1 M z ⁇ M z ⁇ ⁇ lim W z ⁇ S z ⁇ 0 M z ⁇ M z ⁇ 0 lim W z ⁇ S z ⁇ ⁇ ⁇ M z ⁇ M z ⁇ 1 .
- the useful signal transfer characteristic M(z) approaches 1 when the open loop transfer characteristic (W(z) ⁇ S(z)) increases or decreases and approaches 0 when the open loop transfer characteristic (W(z) ⁇ S(z)) approaches 0.
- the useful signal x[n] has to be adapted additionally in higher spectral ranges to ensure that the useful signal x[n] is apprehended identically by a listener when ANC is on or off. Compensation in higher spectral ranges is, however, quite difficult so that a certain difference between "on” and "off” will be apparent.
- the useful signal transfer characteristic M(z) does not depend on the transfer characteristic S(z) of the secondary path 2 and its fluctuations due to aging, temperature, change of listener etc.
- FIG. 3 is a block diagram illustrating a general feedback type active noise reduction system in which the useful signal is supplied to both, the loudspeaker path and the microphone path.
- the primary path 1 is omitted below notwithstanding that noise (disturbing signal d[n]) is still present.
- the system of FIG. 3 is based on the system of FIG. 1 , however, with an additional subtractor 8 that subtracts the useful signal x[n] from the microphone output signal y[n] to form the ANC filter input signal u[n] and with a subtractor 9 that substitutes adder 6 and subtracts the useful signal x[n] from error signal e[n].
- M z S z ⁇ W z ⁇ S z / 1 ⁇ W z ⁇ S z lim W z ⁇ S z ⁇ 1 M z ⁇ M z ⁇ ⁇ lim W z ⁇ S z ⁇ 0 M z ⁇ M z ⁇ S z lim W z ⁇ S z ⁇ ⁇ ⁇ M z ⁇ M z ⁇ 1 .
- FIG. 4 a system is shown that is based on the system of FIG. 3 and that additionally includes an equalizing filter 10 connected upstream of the subtractor 9 in order to filter the useful signal x[n] with the inverse secondary path transfer function 1/S(z).
- the microphone output signal y[n] is identical to the useful signal x[n], which means that signal x[n] is not altered by the system if the equalizer filter is exact the inverse of the secondary path transfer characteristic S(z).
- This configuration acts as an ideal linearizer, i.e. it compensates for any deteriorations of the useful signal due to its transfer from the loudspeaker 3 to the microphone 4 representing the listener's ear.
- FIG. 5 a system is shown that is based on the system of FIG. 3 and that additionally includes an equalizing filter 10 connected upstream of the subtractor 8 in order to filter the useful signal x[n] with the secondary path transfer function S(z).
- the useful signal transfer characteristic M(z) is identical with the secondary path transfer characteristic S(Z) when the ANC system is active.
- the useful signal transfer characteristic M(z) is also identical with the secondary path transfer characteristic S(Z).
- the ANC filter 5 and the equalizing filters 10 and 11 may be fixed filters with constant transfer characteristics or adaptive filters with controllable transfer characteristics.
- the adaptive structure of a filter per se is indicated by an arrow underlying the respective block and the optionality of the adaptive structure is indicated by a broken line.
- the system shown in FIG. 5 is, for example, applicable in headphones in which useful signals, such as music or speech, are reproduced under different conditions in terms of noise and the listener may appreciate being able to switch off the ANC system, in particular when no noise is present, without experiencing any audible difference between the active and non-active state of the ANC system.
- the systems presented herein are not applicable in headphones only, but also in all other fields in which occasional noise reduction is desired.
- FIG. 6 illustrates an exemplary earphone with which the present active noise reduction systems may be used.
- the earphone may be, together with another identical earphone, part of a headphone (not shown) and may be acoustically coupled to a listener's ear 12.
- the ear 12 is exposed via primary path 1 to the disturbing signal d[n], e.g., ambient noise.
- the earphone comprises a cup-like housing 14 with an aperture 15 that may be covered by a sound permeable cover, e.g., a grill, a grid or any other sound permeable structure or material.
- the loudspeaker 3 radiates sound to the ear 12 and is arranged at the aperture 15 of the housing 14, both forming an earphone cavity 13.
- the cavity 13 may be airtight or vented by any means, e.g., by means of a port, vent, opening, etc.
- the microphone 4 is positioned in front of the loudspeaker 3.
- An acoustic path 17 extends from the speaker 3 to the ear 12 and has a transfer characteristic which is approximated for noise control purposes by the transfer characteristic of the secondary path 2 which extends from the loudspeaker 3 to the microphone 4.
- analog circuitry In mobile devices such as headphones, the space and energy available for the ANC system is quite limited. Digital circuitry may be too space and energy consuming and in mobile devices analog circuitry is often the preferred in the design of ANC systems.
- analog circuitry allows only for a very limited complexity of the ANC system and thus it is hard to correctly model the secondary path solely by analog means.
- analog filters used in an ANC system are often fixed filters or very simple adaptive filters because they are easy to build, have low energy consumption and require little space.
- FIGS. 4, 5 and 7 also provide good results when employing analog circuitry as there is a minor ( FIG. 4 ) or even no
- FIGS. 5 and 7 dependency on the secondary path behavior. Furthermore, the systems of FIGS. 5 and 7 allow for a good estimation of the necessary transfer characteristic of the equalization filter based on the ANC filter transfer characteristic W(z), as well as on the secondary path filter characteristic S(z), both forming the open loop transfer characteristic W(z) ⁇ S(z), which, in principal, has only minor fluctuations, and based on the assessment of the acoustic properties of the headphone when attached to a listener's head.
- the ANC filter 5 will usually have a transfer characteristic that tends to have lower gain at lower frequencies with an increasing gain over frequency to a maximum gain followed by a decrease of gain over frequency down to loop gain.
- the loop inherent in the ANC system keeps the system linear in a frequency range of, e.g., below 1 kHz and thus renders any equalization redundant in this frequency range.
- the ANC filter 5 has almost no boosting or cutting effects and, accordingly, no linearization effects.
- the useful signal transfer characteristic M(z) experiences a boost at higher frequencies that has to be compensated for by means of a respective filter, e.g.
- a shelving filter additional to an equalizing filter.
- boosts and cuts may occur in the frequency range between 1 kHz and 3 kHz.
- boosts are more disturbing than cuts and thus it may be sufficient to compensate for boosts in the transfer characteristic by correspondingly designed cut filters.
- a second equalizing filter may be used.
- FIG. 7 shows an exemplary ANC system that employs (at least) two filters 18 and 19 (sub-filters) instead of a single filter 11 as in the system of FIG. 5 .
- a treble cut shelving filter e.g., filter 18
- a treble cut equalizing filter e.g., filter 19
- S(z) S 1 (z) ⁇ S 2 (z)
- a treble boost equalizing filter may be implemented as, e.g., filter 18 and a treble cut equalizing filter as, e.g., filter 19.
- three filters may be employed, e.g., one treble cut shelving filter and two treble boost/cut equalizing filters.
- the number of filters used may depend on many other aspects such as costs, noise behavior of the filters, acoustic properties of the headphone, delay time of the system, space available for implementing the system, etc.
- FIG. 8 is a schematic diagram of the transfer characteristics a, b of shelving filters applicable in the system of FIG. 7 .
- a first order treble boost (+9 dB) shelving filter (a) and a bass cut (-3 dB) shelving filter (b) are shown.
- FIG. 9 is a schematic diagram of the transfer characteristics c, d of equalizing filters applicable in the system of FIG. 7 .
- One (c) of the equalizing filters provides a 9 dB boost at 1 kHz and the other (d) a 6 dB cut at 100 Hz having a higher Q and, thus, a sharper bandwidth.
- Shelving filters are usually simple first-order filters which alter the relative gains between frequencies much higher and much lower than the corner frequencies.
- a low or bass shelf is adjusted to affect the gain of lower frequencies while having no effect well above its corner frequency.
- a high or treble shelf adjusts the gain of higher frequencies only.
- a single equalizer filter implements a second-order filter function. This involves three adjustments: selection of the center frequency, adjustment of the quality (Q) factor, which determines the sharpness of the bandwidth, and the level or gain which determines how much the selected center frequency is boosted or cut relative to frequencies (much) above or below the center frequency.
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Signal Processing (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Otolaryngology (AREA)
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Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11175344.8A EP2551845B1 (en) | 2011-07-26 | 2011-07-26 | Noise reducing sound reproduction |
CA2783382A CA2783382C (en) | 2011-07-26 | 2012-07-19 | Noise reducing sound reproduction |
JP2012163857A JP2013029834A (ja) | 2011-07-26 | 2012-07-24 | ノイズ除去音声再生 |
CN2012102616254A CN102905208A (zh) | 2011-07-26 | 2012-07-26 | 噪声降低的声音再现 |
CN201610404120.7A CN106060715A (zh) | 2011-07-26 | 2012-07-26 | 噪声降低的声音再现 |
CN201811432252.6A CN109600698B (zh) | 2011-07-26 | 2012-07-26 | 噪声降低的声音再现系统及方法 |
US13/559,093 US9491537B2 (en) | 2011-07-26 | 2012-07-26 | Noise reducing sound reproduction system |
JP2016129708A JP2016218456A (ja) | 2011-07-26 | 2016-06-30 | ノイズ除去音声再生 |
Applications Claiming Priority (1)
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EP11175344.8A EP2551845B1 (en) | 2011-07-26 | 2011-07-26 | Noise reducing sound reproduction |
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EP2551845A1 EP2551845A1 (en) | 2013-01-30 |
EP2551845B1 true EP2551845B1 (en) | 2020-04-01 |
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EP11175344.8A Active EP2551845B1 (en) | 2011-07-26 | 2011-07-26 | Noise reducing sound reproduction |
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EP (1) | EP2551845B1 (zh) |
JP (2) | JP2013029834A (zh) |
CN (3) | CN106060715A (zh) |
CA (1) | CA2783382C (zh) |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2647002B1 (en) | 2010-12-03 | 2024-01-31 | Cirrus Logic, Inc. | Oversight control of an adaptive noise canceler in a personal audio device |
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CN102905208A (zh) | 2013-01-30 |
CN106060715A (zh) | 2016-10-26 |
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JP2013029834A (ja) | 2013-02-07 |
CA2783382C (en) | 2016-02-23 |
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CN109600698A (zh) | 2019-04-09 |
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