EP3373601A1 - Procédé pour une distorsion de fréquence d'un signal audio ainsi qu'une prothèse auditive mettant en oeuvre un tel procédé - Google Patents

Procédé pour une distorsion de fréquence d'un signal audio ainsi qu'une prothèse auditive mettant en oeuvre un tel procédé Download PDF

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Publication number
EP3373601A1
EP3373601A1 EP18154220.0A EP18154220A EP3373601A1 EP 3373601 A1 EP3373601 A1 EP 3373601A1 EP 18154220 A EP18154220 A EP 18154220A EP 3373601 A1 EP3373601 A1 EP 3373601A1
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EP
European Patent Office
Prior art keywords
frequency
signal
frequency band
band
distortion
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Granted
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EP18154220.0A
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German (de)
English (en)
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EP3373601B1 (fr
Inventor
Tobias Daniel Rosenkranz
Tobias Wurzbacher
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Sivantos Pte Ltd
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Sivantos Pte Ltd
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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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • 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
    • G10L21/0272—Voice signal separating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/353—Frequency, e.g. frequency shift or compression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
    • 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
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Definitions

  • the invention relates to a method for frequency distortion of an audio signal, wherein a different distortion of the frequencies is applied to different signal components of the audio signal and thereby a frequency-distorted signal is generated.
  • the acoustic feedback can occur here when an output sound signal generated by the acoustic system partially couples into an input transducer of the acoustic system, which is provided for receiving the sound signal of the environment and for the corresponding generation of an electrical input signal.
  • Signal components of the output sound signal can be electrically amplified in this case again by the acoustic system, so that in the output sound signal noise is formed, which can completely superimpose possible useful signals in the sound signal of the environment to their inaudibility.
  • a suppression or compensation of acoustic feedback is often provided.
  • Such compensation is often done by means of an adaptive filter, which is the input amplified amplified output signal from which the output sound signal is generated, supplied as input. From this, a compensation signal is generated, which is supplied to the still unamplified input signal for compensation of the feedback.
  • the control of the adaptive filter This is usually done via an error signal, which is formed from the difference between the input signal and the compensation signal.
  • the amplified output signal in the acoustic system is often subjected to a frequency distortion, whereby the output signal from the input signal is decorrelated, so that an occurrence of the described signal cancellation can be largely avoided.
  • the frequency distortion is usually applied only to a specific frequency range of the amplified signal, for which the latter is filtered at a given pitch frequency into a signal component to be distorted and a signal component that is not to be distorted.
  • the pitch frequency is usually adapted to a determined acoustic feedback.
  • the implementation of the pitch frequency is usually done via high-pass and low-pass filters, which lead to additional latency in the acoustic system.
  • the EP 2 244 491 B2 refers to a method for operating a hearing aid, which provides the division of an input signal into a high and a low-frequency signal component, wherein a frequency distortion is applied to the high-frequency signal component.
  • a cutoff frequency for the division into the high and the low-frequency signal component is determined by means of an analysis of the input signal such that artifacts in an output signal, which is formed on the basis of the low-frequency and the frequency-distorted high-frequency signal component, are reduced as far as possible.
  • the invention is therefore based on the object of specifying a method for frequency distortion of an audio signal, which should minimize the latency as possible while suppressing the formation of artifacts as possible.
  • the above object is achieved by a method for frequency distortion of an audio signal, wherein the audio signal in a plurality of is divided by two adjacent frequency bands each, a band limit frequency is determined, based on the audio signal (directly or indirectly) a first frequency band and lying directly above the first frequency band second frequency band are determined, and wherein on signal components in the first frequency band a different distortion of the frequencies is applied than to signal components in the second frequency band.
  • a frequency-distorted signal is generated.
  • the frequency-distorted signal is given in the frequency domain.
  • an audio signal generally comprises an electrical signal whose waveform can serve as a carrier for acoustic information, and which can be converted into a corresponding sound signal by a suitable output transducer.
  • the division of the audio signal into a plurality of predetermined frequency bands takes place here, for example, by means of a filter bank.
  • the specification of the individual frequency bands, in particular the band characteristics of the individual frequency bands, such as the respective center frequency and / or bandwidth, takes place here, for example, by a higher-level application in which the audio signal is used.
  • the higher-level application is given for example by a signal processing process in a hearing aid.
  • the specification of the individual frequency bands is carried out in particular based on the requirements for the frequency-band-wise signal processing in the hearing aid.
  • Two frequency bands are to be regarded as immediately adjacent, in particular, if no further characteristic frequency of another frequency band is located between the two characteristic frequencies, which each define the position of a frequency band in the frequency domain.
  • a center frequency of a frequency band or a maximum frequency of the magnitude frequency response is used as such a characteristic frequency.
  • the band limit frequency of two directly adjacent frequency bands is preferably to be determined such that information about the filter behavior of each of the two relevant frequency bands is provided in the frequency range in which the two respective frequency bands are adjacent, ie in particular in a possible overlap region.
  • the band limit frequency is determined as the frequency for which the two immediately adjacent frequency bands have the same magnitude frequency response, or as the arithmetic or geometric mean between the characteristic frequencies determining the two immediately adjacent frequency bands.
  • a (first) target frequency is first determined based on the audio signal, which indicates a desired boundary between two frequency ranges with different distortion. Based on this target frequency, the first and second frequency band are then determined indirectly. Since the target frequency is derived from properties of the audio signal, this target frequency coincides exactly in exceptional cases with one of the band limit frequencies. In general, it is more or less spaced from the next band limit frequency.
  • the first target frequency is determined in particular in the framework of the higher-level application of the audio signal, for example in the case of a signal processing process in a hearing aid as a function of a requirement occurring in the hearing aid frequency distorted signals in a particular frequency range.
  • the first target frequency is preferably determined such that it meets the requirements of the desired frequency distortion of the audio signal by the higher-level application particularly well, so that in particular the first target frequency for the parent application of the audio signal in terms of frequency distortion represents a critical value, at which suitably a change of the frequency distortion of the audio signal has to be preferred.
  • such a critical frequency for the frequency distortion is given, for example, by a signal to be suppressed acoustic feedback on the hearing aid, which is preferably carried out in the smallest possible frequency range, wherein in the context of the suppression of the acoustic feedback, a frequency distortion is applied.
  • the critical frequency in this case, for example, the minimum frequency is selected for which suppression of acoustic feedback is required to ensure an overall gain of less than one in the closed loop formed by the acoustic feedback path and the signal processing.
  • the determination of the first frequency band and the second frequency band immediately above the first frequency band preferably takes place solely on the basis of the first target frequency, for example by selecting those immediately adjacent frequency bands as the first frequency band and immediately above the second frequency band whose band limit frequency is in particular directly below the first target frequency ie, in particular between the first target frequency and the lower band limit frequency at which the first frequency band and the second frequency band are adjacent, no further band limit frequency of other frequency bands is more.
  • additional parameters are used in addition to the first target frequency. For example, the respective signal components in the individual frequency bands are taken into account, and thus only those frequency bands are permitted as the first frequency band and second frequency band, for the signal components, a predetermined maximum level is not exceeded.
  • the first target frequency is defined as a maximum critical frequency with regard to the frequency distortion
  • the signal levels are taken into consideration, for example, such that two adjacent frequency bands are determined with a band limit frequency below the first target frequency, the signal components of which do not exceed the specified maximum level.
  • further signal processing steps take place, For example, a frequency band-specific amplification of the signal components guided in the individual frequency bands.
  • the signal components in the first frequency band or in the second frequency band to which the mutually different distortion of frequencies is to be applied are not necessarily identical to the signal components of the audio signal during the division into the individual frequency bands.
  • further signal processing steps may also be connected downstream of the frequency distortion.
  • the respective distortion of the frequencies is not limited to the signal components of the first frequency band or of the second frequency band, but may also extend to further, further from the band limit frequency between the first frequency band and the second frequency band located frequency bands.
  • the "different frequency distortion" of the signal components in the first or second frequency band includes in particular the case that the signal components in one of these two frequency bands (and optionally the associated other frequency bands) is not distorted, so the output frequency of this frequency band or of these frequency bands corresponds to the respective input frequency.
  • the first frequency band which is determined is that frequency band whose upper band limit frequency is formed by the band limit frequency which is in particular directly below the first target frequency.
  • Most common implementations of dividing an audio signal into a plurality of predetermined frequency bands are designed such that the resulting frequency bands each have a magnitude frequency response with a defined maximum and / or without local minima.
  • the range between the two band limit frequencies to the immediately adjacent frequency bands will be indicated as the range of the frequency band in which the magnitude frequency response usually has its maximum and / or the magnitude frequency response is greater than beyond one of the band limit frequencies.
  • This area is now identified in particular as the core area of the frequency band.
  • the proposed determination of the first frequency band as the frequency band whose upper band limit frequency is formed by the immediately below the first target frequency band limit frequency, it is achieved that for the described embodiment of the frequency bands, the first target frequency is in the core region of the second frequency band.
  • the said selection and the associated classification of the first target frequency in the core area of the second frequency band can be performed by a corresponding frequency Frequency distortion of the second frequency band are advantageously achieved in the invention, that this desired minimum property of the first target frequency is taken into account in each case.
  • the first and second frequency bands are determined based on the audio signal instead of the first frequency band determines a different third frequency band.
  • a different distortion of the frequencies is applied to signal components in this third frequency band than to signal components in a frequency band immediately adjacent (in particular immediately above) the third frequency band.
  • a second target frequency is first determined based on the audio signal instead of the first target frequency. On the basis of this target frequency, the third frequency band is then determined indirectly.
  • the second target frequency does not usually coincide with one of the band limit frequencies, but is more or less regularly spaced from the next band limit frequency.
  • the determination of the third frequency band (and optionally also the determination of the second target frequency) is carried out in this case in particular by a current, periodic or event-controlled updating in the context of the higher-level application for the audio signal.
  • the distortion of frequencies of signal components in the third frequency band or the immediately adjacent frequency band is carried out in particular analogous to the above-described form of distortion of the frequencies of signal components in the first and second frequency band. In other words, the boundary between two frequency ranges different in frequency distortion is shifted in response to the audio signal by switching frequency bands between different types of frequency distortion.
  • a distortion of the frequencies initially set as described above with respect to the signal components in the first frequency band and in the second frequency band can be achieved by merely shifting the application range to the third frequency band and the frequency band immediately above the third frequency band.
  • the adaptation of the distortion of frequencies to the second target frequency which in the manner to be assigned to a different frequency band and thus to a different band limit frequency than the first target frequency, makes it possible to respond to changing requirements to respond to the frequency distortion of the audio signal in the parent application, so for example, to changes in a suppressible feedback in the signal processing in a hearing aid.
  • the second target frequency is preferably checked whether the second target frequency lies directly above the upper limiting frequency of another frequency band different from the first frequency band, the further frequency band being determined as the third frequency band as a function of this check, and a different distortion being applied to the signal components in the third frequency band the frequencies is applied as to the signal components of the frequency band immediately above the third frequency band.
  • the second target frequency is assigned to the third frequency band in such a way that the core region of the frequency band immediately above the third frequency band comprises the second target frequency. This is particularly advantageous when the second target frequency is determined based on the audio signal according to the requirements of the parent application as a minimum frequency for a desired frequency distortion.
  • the classification of the second target frequency in the core region of the frequency band immediately above the third frequency band and the corresponding application of the desired frequency distortion at least on said frequency band and optionally on other frequency bands above and excluding the third frequency band then takes this minimum property of the second target frequency into account.
  • the distortion of frequencies is in each case given by a shift by a constant amount across the frequency and / or a time-dependent modulated frequency value.
  • the time-dependent modulated frequency value is constant over the frequency.
  • a distortion of frequencies to be applied to the signal components of the first frequency band in different ways than to the signal components of the second frequency band is then achieved in particular by a difference in the constant amount.
  • the amount of frequency shift within the scope of the invention should also be zero so that the relevant frequencies are not effectively shifted.
  • the frequency distortion is correlated in the frequency domain with a time-dependent phase modification of the frequency-distorted signal component.
  • the signal component which is respectively guided in the affected frequency bands is in particular multiplied by a complex-valued pointer e i ⁇ t , whereby the frequency distortion is achieved.
  • the quantity ⁇ here denotes the magnitude of the frequency distortion for the respective frequency band.
  • the quantity t denotes the time. If ⁇ is the same for several frequency bands, this equals a constant frequency shift of these frequency bands.
  • a change in the frequency distortion to be applied to the signal component in a frequency band is always carried out in such a way that the phase of the frequency-distorted signal component does not jump or jump only in an extent that falls below a limit value (ie changes abruptly) as a result of this change in frequency distortion.
  • the change in the frequency distortion is carried out only at a zero crossing or in a predetermined environment of a zero crossing of the phase modification correlated with the distortion. The change of the frequency distortion thus takes place only when the above-described pointer e i ⁇ t the phase modification is on or in the vicinity of the real axis of the complex number plane (ie for ⁇ ⁇ t ⁇ 0.2 ⁇ , 4 ⁇ .... and e i ⁇ t ⁇ 1).
  • a change of a distortion to be applied to the signal components in a frequency band is here in particular a change such that, as a result of an updating of the first target frequency toward a second target frequency for signal components of frequency bands whose core region is in each case at least partially between the first target frequency and the second target frequency, the distortion of frequencies to be used changes.
  • the change may also consist in a complete switching on or off of a frequency distortion for one or more frequency bands.
  • the deactivation of the frequency distortion is expressed numerically in that the pointer e i ⁇ t presenting the frequency distortion changes into a phase modification term of the value 1. This transition would be known to result in audible artifacts when the pointer e i ⁇ t at the time of switching off has a significantly different from 1 value.
  • the switching off of the frequency distortion in the advantageous embodiment of the invention is permitted only at times when the amount of product term ⁇ t representing the phase modification falls below a predetermined limit of eg ⁇ / 8 or even ⁇ / 16.
  • the first frequency band is additionally filtered with a low-pass filter, and / or the second frequency band additionally filtered with a high-pass filter.
  • the respective filtering takes place here in particular at the band limit frequency between the first frequency band and the second frequency band.
  • the low-pass filter is preferably applied only to the first frequency band and / or the high-pass filter is applied only to the second frequency band.
  • the additional latency that results from the low-pass filter and / or the high-pass filter can be limited to a small frequency range.
  • the band limit frequency between the first frequency band and the second frequency band is preferably shifted by means of the filter characteristic of the low-pass filter and / or by means of the filter characteristic of the high-pass filter from the value predetermined by the distribution of the frequency bands to the first target frequency.
  • the high-pass filter preferably has a greater edge steepness than the low-pass filter.
  • the distortion of frequencies is applied only to signal portions of frequency bands on one side of the band cutoff frequency between the first frequency band and the second frequency band. This is on the one hand signal processing technology particularly easy to implement. On the other hand, in many applications it is important to apply a frequency distortion to the smallest possible range of the audio signal, whereby a minimum range for frequency distortion of the audio signal is predetermined by boundary conditions. In this case, the distortion of frequencies applied only to signal components of those frequency bands in which frequency distortion is considered desirable or required.
  • An embodiment of the invention is further a method for suppressing acoustic feedback in an acoustic system, wherein an input transducer of the acoustic system generates an input signal from a sound signal of the environment, wherein an intermediate signal is generated based on the input signal, which frequency-wise a signal processing with a filter bank Dividing the intermediate signal is supplied, wherein from a frequency-distorted signal, an output signal is generated, which is converted by an output transducer of the acoustic system into an output sound signal, based on the frequency-distorted signal suppresses a coupling of the output sound signal in the input transducer occurring acoustic feedback in the acoustic system and applying to the intermediate signal the above-described frequency distortion method according to the invention, and thereby generating the frequency-distorted signal ,
  • an acoustic system here in particular a hearing aid and systems for recording, amplification and playback of sound signals from the studio and / or stage technology is included.
  • an input transducer is generally an acousto-electrical converter comprises, which is adapted to convert the sound signal of the environment into a corresponding electrical or electro-magnetic signal, so for example a microphone.
  • an output transducer is generally an electro-acoustic transducer comprises, which is adapted to generate from an electrical and / or electro-magnetic signal an output sound signal, so for example a speaker or a sound generator for bone conduction.
  • a signal processing means in particular, a conditioning of the input signal or of a signal derived from the input signal, that is to say, in particular, a frequency-band-dependent amplification and / or noise suppression.
  • a generation of the intermediate signal on the basis of the input signal is to be understood here in particular as meaning that the signal processing receives a signal which is directly dependent on the input signal, that is to say, for example, the input signal which has been corrected for compensation of an acoustic feedback by a compensation signal.
  • the application of the method for frequency distortion to the intermediate signal can then in particular be such that the intermediate signal is divided at the filter bank of the signal processing unit into individual predetermined frequency bands, and after a frequency band-dependent conditioning of the signal components in the individual frequency bands by the signal processing, the different distortion of frequencies the further processed signal components in the first frequency band or in the second frequency band is applied so as to produce the frequency-distorted signal. From this, the output signal u.a. generated by the synthesis of the individual frequency band components.
  • the suppression of the feedback can then be achieved by an adaptive filter based on the frequency-distorted signal, ie in particular by the output signal as a reference variable of the adaptive filter, via a corresponding compensation signal.
  • the invention also relates to a hearing aid, comprising an input transducer for generating an input signal from a sound signal of the environment, and a signal processing unit with a filter bank for dividing an audio signal derived from the input signal based on the input signal and a control unit, which is adapted to the method described above to perform distortion of an audio signal.
  • a hearing aid comprising an input transducer for generating an input signal from a sound signal of the environment, and a signal processing unit with a filter bank for dividing an audio signal derived from the input signal based on the input signal and a control unit, which is adapted to the method described above to perform distortion of an audio signal.
  • the signal processing unit Filterbank Parts of the control unit.
  • the audio signal is an intermediate signal in the control unit.
  • FIG. 1 3 is a block diagram of a method 1 for suppressing acoustic feedback g in an acoustic system.
  • the acoustic system is given here by a hearing aid 2.
  • the hearing aid 2 comprises an input transducer 4, which generates an input signal 8 from a sound signal 6 of the environment, and in the present case is given by a microphone. From the input signal 8, a compensation signal 10 is subtracted, which is generated in a manner to be described in an electric feedback loop 12.
  • the intermediate signal 14 resulting from the input signal 8 and the compensation signal 10 is supplied to a signal processor 16, in which the user-specific signal processing processes for the hearing device 2 take place (in particular a frequency-band-dependent amplification of the intermediate signal 14).
  • the signal processing 16 comprises a filter bank 18, at which the intermediate signal is divided into individual frequency bands which are then processed according to user-specific.
  • the signal processing 16 now outputs a frequency-band-resolved processed signal 20 to which a frequency distortion 22 is applied in a method to be described.
  • the frequency-distorted signal 24 resulting from the frequency distortion 22 in the time-frequency domain is now converted at a synthesis filter bank 26 to a wideband output signal 28 in the time domain, which in turn is converted by an output transducer 30 into an output sound signal 32.
  • the output transducer 30 is given in the present case by a loudspeaker.
  • the output signal 28 is branched off into the electrical feedback loop 12, where it is fed to an adaptive filter 34, which also receives the intermediate signal 14 as an additional input as an error signal, and from this the compensation signal 10 for suppressing the acoustic feedback g generated. Due to the frequency distortion 22, the output signal 28 is thereby decorrelated from the input signal 8 and thus also from the intermediate signal 14, so that the latter is not completely adapted to the tonal signal components of the output signal 28 by the renewed input of the error signal 14 into the adaptive filter 34. As a result, formation of artifacts in the output signal 28 and thus in the output sound signal 32 can be avoided. In this case, the suppression of the acoustic feedback g by the compensation signal 10 can be restricted in particular to certain frequency ranges, that is, the compensation signal 10 has significant signal components only for said frequency bands, in particular for those to which the frequency distortion 22 has been applied.
  • FIG. 2 schematically shows in a block diagram the sequence of a method 40 for frequency distortion 22 of the intermediate signal 14 after FIG. 1 shown.
  • the intermediate signal 14 in this case forms the audio signal 42, which functions as the input variable relevant to the method 40.
  • a first step S1 it is checked on the basis of the audio signal 42 in which frequency range an acoustic feedback g from the output transducer 30 to the input transducer 8 of the hearing aid 2 is to be suppressed, and in which frequency range also tonal signal components present in the audio signal 42, which may lead to artifacts in the suppression of the feedback in the adaptive filter 34, if necessary.
  • the check with regard to the acoustic feedback g to be suppressed can be carried out by the adaptive filter 34, with regard to the tonality of the signal components, preferably by the signal processing 16. Subsequently, a first target frequency tf1 is determined as a function of the results of these checks.
  • the target frequency tf1 is here determined, in particular, as the minimum frequency above which a frequency distortion is required for an effective suppression of the acoustic feedback.
  • the audio signal 42 is now divided at a filter bank 18 into individual frequency bands.
  • the step S2 may also include further sub-steps, such as a frequency band-dependent processing of the signal components 44 in the generated frequency bands, which, however, do not affect the process of the method 40 itself.
  • a first frequency band FB1 is now determined on the basis of the first target frequency tf1.
  • the first frequency band FB1 is given here as the frequency band whose upper band limit frequency is formed by the immediately below the first target frequency tf1 band limit frequency, the upper band limit frequency is given by that frequency at which the magnitude frequency response of the first frequency band equal to the magnitude frequency response of the frequency band immediately over the first frequency band FB1.
  • the frequency band immediately above the first frequency band FB1 is set as the second frequency band FB2.
  • a low-pass filter TP is then applied to the second frequency band FB2 via the first frequency band FB1 at its band limit frequency, and a high-pass filter HP via the second frequency band FB2 at the same band limit frequency.
  • the overlap between the first frequency band FB1 and the second frequency band FB2 is further reduced than it is provided by the filter bank 18, on the other hand can be achieved by an asymmetrical design of the filter characteristics of the high-pass filter HP and the low-pass filter TP, the band limit frequency is easily shifted toward the first target frequency tf1.
  • step S5 a frequency distortion 22 in the form of a frequency shift 46 is now applied to the signal components 44 in all frequency bands from second frequency band FB2 to a time constant amount ⁇ , while the signal components 44 remain unchanged in all frequency bands from the first frequency band FB1 down , and thus generates the frequency-distorted signal 24.
  • the method 40 also returns to step S1 with the specification of the first frequency band FB1, and continuously, periodically or event-controlled updates the first target frequency to a significant change in the acoustic feedback g, which causes the first target frequency tf1 outside the first Frequency band FB1 is to determine a third frequency band FB3, which takes the place of the first frequency band FB1 to continue the method 40 analog.
  • FIG. 3 the frequency response of a filter bank 18 is plotted against a frequency f.
  • the individual frequency bands FB have a non-negligible overlap OV with the respectively adjacent frequency band, two adjacent frequency bands defining a band limit frequency fL0 to fL3 which is given by the frequency at which the magnitude frequency response of the two adjacent frequency bands is the same.
  • step S1 of the method 40 FIG. 2 the first target frequency tf1 is given, and on the basis of this the first frequency band FB1 is determined as that frequency band whose upper band limit frequency fL1 is formed by the band limit frequency located immediately below the first target frequency tf1.
  • a low-pass filter TP is applied to the upper band limit frequency fL1 via the first frequency band FB1
  • a high-pass filter HP is applied via the second frequency band FB2 to the same band limit frequency fL1, which thus limits the second frequency band FB2 downwards.
  • the overlap OV1 between the first frequency band FB1 and the second frequency band FB2 is reduced.
  • the fact that the two said filters TP, HP are applied to only one frequency band this is the result optionally generated latency spectrally limited to the respective frequency bands.
  • filter order 1 In order to keep the additional latency as low as possible, preferably only one complex-valued zero point (filter order 1) is inserted.
  • the signal components of the audio signal 42 in the frequency bands above the upper band limit frequency fL1 of the first frequency band FB1, ie in the frequency bands from FB2 on up, are then shifted by a constant amount.
  • the acoustic feedback path which changes the acoustic feedback g in the hearing aid 2 changes FIG. 1 conditionally, the first target frequency tf1 is updated corresponding to a second target frequency tf2 adapted to the change.
  • the second target frequency tf2 further corresponds to the band limit frequency fL1 hiss the first frequency band FB1 and the second frequency band FB2, so whether the band limit frequency fL1 also forms the immediately below the second target frequency tf2 band limiting frequency.
  • the frequency shift may be further applied to the signal components of all the frequency bands from the second frequency band FB2 onward as it is (uneven area).
  • the second target frequency is now above the band limit frequency fL3, which limits a frequency band different from the first frequency band upwards to the immediately adjacent frequency band.
  • the frequency band bounded from above by the band limit frequency fL3 is now defined as the third frequency band FB3, and now the frequency shift for signal components preferably of all frequency bands above and excluding the third frequency band FB3 in the manner already described, in particular using corresponding high-pass or low-pass filters on the Band limit frequency fL3, performed (cross-hatched area).
  • FIG. 4 is the absolute frequency response of the first frequency band FB1 and the second frequency band FB2 after FIG. 3 plotted against the band limit frequency fL1 against a frequency f.
  • the dotted lines each show the magnitude frequency response of the frequency bands FB1, FB2, as in the range of the band limit frequency fL1 is specified by the higher-level filter bank.
  • a low-pass filter or a high-pass filter applied to the first frequency band or the second frequency band can be in the range of the band limit frequency fL1 of the overlap OV1 decrease (OV1 dashed lines).
  • the band limit frequency fL1 can also easily be shifted to a matched band limit frequency fL1 ', for example in the direction of the first target frequency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (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)
  • Amplifiers (AREA)
EP18154220.0A 2017-03-06 2018-01-30 Procédé pour une distorsion de fréquence d'un signal audio ainsi qu'une prothèse auditive mettant en oeuvre un tel procédé Active EP3373601B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017203631.1A DE102017203631B3 (de) 2017-03-06 2017-03-06 Verfahren zur Frequenzverzerrung eines Audiosignals

Publications (2)

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EP3373601A1 true EP3373601A1 (fr) 2018-09-12
EP3373601B1 EP3373601B1 (fr) 2023-05-31

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US (1) US10397712B2 (fr)
EP (1) EP3373601B1 (fr)
JP (1) JP6622830B2 (fr)
CN (1) CN108540907B (fr)
DE (1) DE102017203631B3 (fr)
DK (1) DK3373601T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3783919B1 (fr) * 2019-08-22 2023-04-26 Sonova AG Réglage de gain d'aiguës de dispositif auditif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009018812A1 (de) * 2009-04-24 2010-11-11 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb einer Hörvorrichtung und Hörvorrichtung mit einer Frequenzweiche
US20160057548A1 (en) * 2014-08-20 2016-02-25 Sivantos Pte. Ltd. Method, device, and system for suppressing feedback in hearing aid devices with adaptive split-band frequency
DE102015204010A1 (de) * 2015-03-05 2016-09-08 Sivantos Pte. Ltd. Verfahren zur Unterdrückung eines Störgeräusches in einem akustischen System

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005094265A (ja) * 2003-09-16 2005-04-07 Victor Co Of Japan Ltd オーディオ再生装置
US8494199B2 (en) 2010-04-08 2013-07-23 Gn Resound A/S Stability improvements in hearing aids
JP2014204213A (ja) 2013-04-03 2014-10-27 パイオニア株式会社 デジタルフィルタ及びフィルタ特性変更方法
DE102015204253B4 (de) 2015-03-10 2016-11-10 Sivantos Pte. Ltd. Verfahren zur frequenzabhängigen Rauschunterdrückung eines Eingangssignals sowie Hörgerät
DE102015216822B4 (de) * 2015-09-02 2017-07-06 Sivantos Pte. Ltd. Verfahren zur Unterdrückung einer Rückkopplung in einem Hörgerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009018812A1 (de) * 2009-04-24 2010-11-11 Siemens Medical Instruments Pte. Ltd. Verfahren zum Betrieb einer Hörvorrichtung und Hörvorrichtung mit einer Frequenzweiche
US20160057548A1 (en) * 2014-08-20 2016-02-25 Sivantos Pte. Ltd. Method, device, and system for suppressing feedback in hearing aid devices with adaptive split-band frequency
DE102015204010A1 (de) * 2015-03-05 2016-09-08 Sivantos Pte. Ltd. Verfahren zur Unterdrückung eines Störgeräusches in einem akustischen System

Also Published As

Publication number Publication date
US10397712B2 (en) 2019-08-27
CN108540907A (zh) 2018-09-14
EP3373601B1 (fr) 2023-05-31
CN108540907B (zh) 2020-09-01
DK3373601T3 (da) 2023-08-28
DE102017203631B3 (de) 2018-05-17
JP2018148562A (ja) 2018-09-20
US20180255407A1 (en) 2018-09-06
JP6622830B2 (ja) 2019-12-18

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