EP3240307B1 - Procédé de transfert d'un signal audio - Google Patents

Procédé de transfert d'un signal audio Download PDF

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Publication number
EP3240307B1
EP3240307B1 EP17155426.4A EP17155426A EP3240307B1 EP 3240307 B1 EP3240307 B1 EP 3240307B1 EP 17155426 A EP17155426 A EP 17155426A EP 3240307 B1 EP3240307 B1 EP 3240307B1
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value
reconstructed
receiver
channel
values
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German (de)
English (en)
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EP3240307A1 (fr
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Tobias Daniel Rosenkranz
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Sivantos Pte Ltd
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Sivantos Pte Ltd
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    • 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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/552—Binaural
    • 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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • 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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
    • 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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/032—Quantisation or dequantisation of spectral components
    • 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
    • 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
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
    • 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
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/12—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being prediction coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/43—Signal processing in hearing aids to enhance the speech intelligibility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/53—Hearing aid for unilateral hearing impairment using Contralateral Routing Of Signals [CROS]
    • 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
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/03—Aspects of the reduction of energy consumption in hearing devices

Definitions

  • the invention relates to a method for transmitting an audio signal from a transmitter to a receiver.
  • the invention further relates to a hearing aid and a hearing aid system with two hearing aids of this type.
  • the hearing aid is preferably a hearing aid.
  • a hearing aid People with hearing loss usually use a hearing aid.
  • an ambient sound is usually recorded using an electromechanical sound transducer.
  • the detected electrical signals are processed by means of an amplifier circuit and introduced into the person's ear canal by means of a further electromechanical transducer.
  • Different types of hearing aids are known.
  • the so-called “behind-the-ear devices” are worn between the skull and the auricle.
  • the amplified sound signal is introduced into the auditory canal by means of a sound tube.
  • Another common design of a hearing aid is an "in-the-ear device” in which the hearing aid itself is inserted into the auditory canal. Consequently, the auditory canal is at least partially closed by means of this hearing aid device, so that, apart from the sound signals generated by the hearing aid device, no further sound - or only to a greatly reduced extent - can penetrate into the auditory canal.
  • a hearing aid system with two hearing aid devices of this type is used. Each of the ears is assigned one of the hearing aids.
  • the audio signals recorded with one of the hearing aids it is necessary for the audio signals recorded with one of the hearing aids to be transmitted to the other hearing aid to provide.
  • this requires transmission with only a comparatively small time offset.
  • the person's head acts as damping, which is why the transmission rate between the hearing aids is limited.
  • a transmission power is limited.
  • US 2004/044527 A1 shows an audio encoder, in which a quantization is used.
  • the invention is based on the object of specifying a particularly suitable method for transmitting an audio signal from a transmitter to a receiver, and a particularly suitable hearing aid and also a particularly suitable hearing aid system with two hearing aids, in particular an audio quality being improved, and preferably a transmission rate being reduced is.
  • the method serves to transmit an audio signal from a transmitter to a receiver, the transmitter or the receiver preferably being part of a hearing aid.
  • the respectively remaining element that is to say the transmitter or the receiver, is suitably a component of a further component of a hearing device system having the hearing device.
  • the hearing aid is a headphone or comprises a headphone.
  • the hearing aid is particularly preferably a hearing aid.
  • the hearing aid is used to support a person suffering from impaired hearing.
  • the hearing aid is a medical device, by means of which, for example, a partial hearing loss is compensated for.
  • the hearing aid is, for example, a "receiver-in-the-canal” hearing aid (RIC; Ex-Hörer hearing aid), an in-the-ear hearing aid, such as an "in-the-ear” hearing aid, an "in-the” -canal "- hearing aid (ITC) or a” complete-in-canal "hearing aid (CIC), hearing glasses, a pocket hearing aid, a bone conduction hearing aid or an implant.
  • the hearing aid device is particularly preferably a behind-the-ear hearing aid device (“behind-the-ear” hearing aid device) which is worn behind an ear cup.
  • the method provides for an input signal corresponding to the audio signal to be divided into time slots on the transmitter side, the length of the time slots preferably being the same.
  • the length of the time window is, for example, between 0.5 ms and 2 ms and in particular 1 ms.
  • the input signal is preferably the audio signal or in part thereof.
  • the audio signal is broken down into different input signals, each input signal being divided into different time windows.
  • the time windows for example their length, differ in particular in the case of different input signals.
  • the input signal is divided into a number of channels on the transmitter side.
  • the channels are frequency channels, hereinafter referred to as channels.
  • a current channel value is assigned to each frequency channel on the transmitter side.
  • the current channel value is, for example, an amplitude and / or a phase or a signal level.
  • the current channel value is in particular a complex value and has a real and an imaginary part.
  • a number of forecast values for the current channel values are created on the basis of previous channel values, each of the current channel values being assigned one of the forecast values.
  • the creation is such that a difference between the respective forecast value and the assigned current channel value is as small as possible.
  • each of the forecast values is uniquely assigned to one of the current channel values.
  • the previous channel values were assigned to a time window preceding the time, for example the time window directly preceding them. In other words, a previous time window has already been divided into the number of channels and a previous channel value has just been assigned to each of these channels.
  • the value zero (0) is used for all previous channel values.
  • the previous channel values are assigned to the first time window and the current channel values to the subsequent time window.
  • a number of temporally preceding channel values is used to generate the forecast values, with for example a number of previous channel values associated with the same temporally preceding time window being used for each of the forecast values.
  • a number of previous channel values are used for each of the forecast values, which are assigned to different temporally preceding time windows.
  • a reference value is determined on the transmitter side, the reference value having a specific property and, for example, not or only deviating to a small extent from a specific, predetermined value. Alternatively, the reference value deviates the least from the specific, predetermined value.
  • a gain value is assigned to a forecast value on the transmitter side and is determined on the basis of the reference value. The current channel value assigned to this forecast value is changed to an adapted channel value by means of the gain factor. In summary, therefore, one of the forecast values is assigned a gain factor, and the gain factor is used to change the current channel value, which is assigned to the same forecast value, to the adjusted channel value.
  • the current channel value is multiplied by the gain factor, or the gain factor is added to the assigned current channel value in order to create the adapted channel value.
  • the amplification factor is preferably applied to both the real and the imaginary component, that is to say both parts are modified by means of the same amplification factor.
  • the current channel value is used as an argument of a function that has the gain factor as at least one parameter. The result of the function is the adjusted channel value.
  • the adapted channel value is assigned to an adapted data record on the transmitter side.
  • the adjusted record has the adjusted channel value.
  • the adapted data record has further values, the adapted data record preferably having the same number of values as there are current channel values.
  • a transmission value corresponding to the adapted data record is transmitted from the transmitter to the receiver, the transmission value advantageously being first created on the transmitter side using the adapted data record.
  • the transmission value preferably has a lower dimensionality, or at most the same dimensionality as the adapted data set, and is, for example, a one-dimensional value.
  • a reconstructed adapted data record is created based on the transmission value, which corresponds to the adapted data record available on the transmitter side.
  • the reverse function for creating the transmission value is carried out on the basis of the adapted data record.
  • the reconstructed adapted data record created in this way thus essentially corresponds to the adapted data record available on the transmitter side, with differences preferably being only due to the creation of the transmission value.
  • the transfer value would be obtained again.
  • the reconstructed data record thus has a reconstructed, adapted channel value, which corresponds to the adapted channel value, and in particular is equal to the adapted channel value.
  • a number of receiver-side forecast values are created on the basis of reconstructed previous channel values, the reconstructed previous channel values in particular corresponding to and suitably corresponding to the previous channel values present on the transmitter side.
  • the receiver-side forecast values are created using the same calculation rule as the forecast values that are available on the transmitter side.
  • the reconstructed previous channel values are expediently reconstructed in a previous execution of the method have been assigned and in particular are assigned to a time-preceding window, preferably the same time-preceding time window to which the channel values preceding the transmitter are assigned. For example, when the method is executed for the first time, the reconstructed previous channel values are assigned zero (0).
  • the number of forecast values on the receiver side corresponds to the number of forecast values that are available on the transmitter side.
  • One of the receiver-side forecast values is assigned to the reconstructed adapted channel value.
  • the reconstructed adapted channel value is assigned the prediction value on the receiver side that was created on the basis of the same data as the forecast value that is associated with the adapted channel value on the transmitter side.
  • a receiver-side reference value is determined on the receiver side, the same procedure being used for determining the receiver-side reference value as for determining the reference value available on the transmitter side.
  • a receiver-side amplification factor is assigned to the reconstructed adapted channel value on the receiver side.
  • the receiver-side gain value is assigned to the receiver-side forecast value, which is assigned to the reconstructed adapted channel value
  • the receiver-side gain factor is assigned to the adapted channel value.
  • the reconstructed adapted channel value on the receiver side is changed to a reconstructed channel value by means of the receiver-side amplification factor.
  • an inverse function to the function is carried out, by means of which the current channel value present at the transmitter is changed to the adapted channel value.
  • the adjusted channel value is divided by the receiver-side gain factor or the receiver-side gain factor is subtracted from the reconstructed adjusted channel value.
  • the reverse operation is used.
  • the gain factor on the receiver side is the inverse element.
  • the reconstructed channel value corresponds to that current channel value to which the amplification factor is assigned on the transmitter side, and in particular the two channel values correspond, any differences preferably being only due to the creation of the transmission value.
  • the reconstructed channel value is added / combined to form a reconstructed output signal.
  • further values of the reconstructed adapted data record or values created on the basis of the reconstructed adapted data record are combined / added to the reconstructed output signal.
  • the reconstructed output signal corresponds to the input signal divided between the channels / the total of the current channel values.
  • the reconstructed output signal is processed further on the receiver side and the individual channels are combined and, for example, transferred into the time domain if the channels correspond to individual frequencies.
  • the channel values of the reconstructed output signal are used as reconstructed previous channel values and at least the prediction values on the receiver side are generated on the basis of these. In particular, the method is carried out again after the specific time window has elapsed.
  • noise which is introduced on the basis of the creation of the transmission value can be suitably divided into the current channel values or reconstructed channel values, so that audio quality is increased. Due to the use of the transmission value, an amount of data to be transmitted is reduced. Since the amplification factors are determined on both the receiver and the transmitter side, it is not necessary to transmit this value, which reduces a required transmission rate for the transmission.
  • the reference value is assigned to a specific current channel value and / or one of the forecast values, in particular no adjustment of this current channel value by means of an amplification factor if this current channel value is assigned to the adapted data set.
  • the receiver-side reference value is expediently assigned to one of the receiver-side forecast values.
  • a fixed value e.g. 0dB
  • the minimum of the forecast values or the forecast value assigned to a specific channel is used as the reference value.
  • the maximum of the forecast values is particularly preferably used as the reference value. In other words, the largest of the forecast values is determined, both on the part of the sender and in particular on the part of the recipient.
  • the current channel value to which the maximum of the forecast values is assigned is expediently also assigned to the adapted data set on the transmitter side, and the reconstructed adapted data set with the reconstructed adapted channel value that corresponds to the adapted channel value and with a reconstructed non-adapted is used on the receiver side
  • Channel value that corresponds to the current channel value assigned to the maximum of the forecast values is created.
  • the reconstructed channel value and the reconstructed unadjusted channel value are combined to form the reconstructed output signal. Due to the use of the maximum, the current channel value which is assigned to the largest of the forecast values and which is most likely also the largest of the current channel values is not changed, whereas at least one of the other current channel values is changed.
  • the gain factor is selected such that the deviation between the assigned forecast value and the reference value would be greater than a deviation between the reference value and the forecast value modified by means of the gain factor. Consequently, a deviation between the adapted channel value and the current channel value assigned to the reference value is also very likely reduced, which is why any noise introduced during the creation of the transmission value is only present to a reduced extent in the reconstructed channel value.
  • the reconstructed, unadjusted channel value present on the receiver side is suitably not changed.
  • the amplification factor is preferably selected such that a deviation between the forecast value assigned to it and the reference value is greater than a deviation between the reference value and that by means of the amplification factor would be changed forecast value.
  • the amplification factor were applied to the forecast value to which the amplification factor is assigned, the deviation between the reference value and the just modified forecast value would be reduced.
  • a deviation between the forecast values and the current channel values is comparatively small, a deviation between the adapted channel value and the current channel value to which the maximum of the forecast values is assigned is also reduced.
  • noise is introduced due to the creation of the transmission value, which is dependent on the current channel value to which the reference value is assigned, the noise which the reconstructed channel value has is reduced due to the use of the gain factor and the receiver-side gain factor.
  • the reconstructed unmatched channel value is expediently assigned to the same channel as the current channel value to which the reference value is assigned.
  • the reconstructed channel value is assigned to the same channel that is assigned to the current channel value to the transmitter that the gain factor is assigned to.
  • the preceding channel value assigned to the same channel is preferably used as the forecast value.
  • the respective previous channel value is used as the forecast value for each of the current channel values. In this way, an effort to create the forecast values is reduced. If the input signal therefore has comparatively small fluctuations, a deviation between the forecast value and the respective assigned current channel value is comparatively small.
  • the reconstructed previous channel values are also used as forecast values on the receiver side, the assignment to the respective channels also being taken into account here.
  • a linear forecast is used to create the forecast values or the forecast values on the receiver side, for example using a number of temporally preceding channel values.
  • each of the forecast values is by means of a linear combination created, using for example a number of temporally preceding channel values.
  • the receiver-side reference value is suitably used to determine which of the values of the adapted data set is the reconstructed, unadjusted channel value.
  • the receiver-side forecast values are created and each of the values of the reconstructed, adjusted data set is assigned to one of the receiver-side forecast values.
  • the value of the reconstructed adapted data record, to which the reference value on the receiver side is assigned, is used as the reconstructed, unadjusted channel value.
  • an index or the like is assigned to each value of the reconstructed adapted data record, on the basis of which an assignment to the respective channels takes place.
  • the gain factor is particularly preferably created on the basis of the forecast value to which the gain factor is assigned.
  • the receiver-side gain factor is suitably created on the basis of the receiver-side forecast value to which the reconstructed adapted channel value is assigned. In this way, it is not necessary to transmit the amplification factors or corresponding values between the receiver and the transmitter, which further reduces the amount of data to be transmitted. In particular, the same calculation rule is used to create the gain factor or the receiver-side gain factor.
  • the amplification factor is suitably created on the basis of the difference between the reference value and the forecast value.
  • the difference between the reference value and the forecast value to which the gain factor is to be assigned is first created.
  • the gain factor is determined on the basis of this difference.
  • the gain factor is the difference which is multiplied, for example, by a factor, the factor advantageously being chosen to be constant.
  • the difference between the prediction value on the receiver side, to which the reconstructed, adapted channel value is to be assigned, and the receiver end also becomes the receiver side Reference value is determined, and the gain factor on the receiver side is determined on the basis of this difference.
  • the gain factor on the receiver side is the difference, which is multiplied by a factor, for example.
  • the determination of the gain factor is comparatively simple.
  • an adaptation of the adapted channel value is such that a deviation from the current channel value assigned to the reference value is reduced.
  • Current changes in the input signal are also taken into account here, which would not be the case, for example, if the gain factors were fixed.
  • a gain factor is assigned to each of the other forecast values, and these are preferably adjusted by means of the assigned gain factor and assigned to the adjusted data set.
  • a number of reconstructed adapted channel values are thus present on the receiver side, each of which is assigned a receiver-side amplification factor, on the basis of which reconstructed channel values are created, which are combined to form the reconstructed output signal.
  • all current channel values with the exception of the current channel value to which the reference value is assigned, are modified by means of the respective amplification factor, and the channel values adapted in this way are transmitted by means of the transmission value.
  • the reconstructed output signal which in particular corresponds to the input signal, is generated on the receiver side on the basis of the reconstructed adapted channel values and the amplification factors present on the receiver side.
  • the adapted data record here only has a single current channel value, namely that to which the reference value is assigned.
  • the receiver-side reference value is determined on the receiver side, so that it is comparatively easy to determine which of the values of the reconstructed adapted data record should not be changed with an amplification factor.
  • the individual gain factors and the individual receiver-side gain factors preferably differ. These are expediently determined in each case on the basis of the respective forecast value and the reference value or the receiver-side forecast value and the receiver-side reference value, expediently on the basis of their difference.
  • w is a constant factor and ⁇ L i denotes the difference between the reference value and the i-th forecast value or the receiver-side reference value and the i-th receiver-side forecast value, where i denotes the respective channel to which the respective forecast value or receiver-side forecast value is assigned is.
  • the noise in the reconstructed channel values is thus less than in the reconstructed unadjusted channel value.
  • noise is therefore reduced with comparatively small current channel values, which improves audio quality.
  • the input signal is divided into the frequency channels by means of a Fourier transformation.
  • bandpass filters are particularly preferred used, which are preferably combined in a filter bank.
  • a difference between a predicted audio signal and the actual audio signal is used as the input signal, for which purpose the audio signal is first divided into the channels or channels deviating therefrom, and the predicted audio signal is generated by means of a linear prediction.
  • x ⁇ (n) denotes the channels of the predicted audio signal.
  • a i denotes a coefficient
  • A a coefficient matrix and y the entirety of the values which are used for the creation, in particular the temporally preceding value of the audio signal divided into the channels.
  • the time of creation here is n - i, and the number used is N.
  • a type of linear prediction is, for example, in " Benesty, J., Chen, J., & Huang, Y. (Arden). (2008). Linear prediction.
  • the transmission value is created by quantizing the adjusted data set.
  • the adapted data record is assigned the transmission value, which is expediently only a discrete number of different ones Can assume values.
  • the transmission value is a discrete value.
  • a transmitter-side reconstructed channel value and a transmitter-side reconstructed unmatched channel value are preferably created on the transmitter side based on the transmission value and on the basis of the amplification factor.
  • the transmitter-side reconstructed channel value corresponds to the reconstructed channel value that is present on the receiver side
  • the transmitter-side reconstructed unmatched channel value corresponds to the reconstructed unmatched channel value that is present on the receiver side.
  • the transmitter-side reconstructed channel value and the transmitter-side reconstructed unmatched channel value are available on the transmitter side.
  • the reconstructed output signal is also generated on the transmitter side on the basis of the transmission value and the amplification factor, which may differ slightly from the input signal due to the quantization and the noise introduced as a result.
  • the transmitter-side reconstructed channel value and the transmitter-side reconstructed non-adapted channel value are used as the temporally preceding channel values or at least as a part thereof. In this way, due to the quantization, deviations between the output signal and the input signal are taken into account when creating the forecast values, which is why a maximum deviation between the input signal and the reconstructed output signal remains small even when the method is carried out repeatedly, and thus high quality during transmission of the audio signal is present.
  • a scalar quantization is suitably used.
  • the quantization is particularly preferably a vector quantization.
  • a so-called gain-shape vector quantization is suitably used.
  • the quantized signal is divided into the signal form / vector form (shape) and a scaling factor (gain).
  • a particularly suitable form of gain-shape vector quantization is logarithmic vector quantization, in particular the (spherical) logarithmic vector quantization.
  • possible signal shapes / vector shapes are points on a (potentially) high-dimensional unit sphere (ie with radius 1).
  • the scaling factor is quantized logarithmically, for example with the known A-law.
  • Other shapes are also possible as signal shapes / vector shapes, such as (high-dimensional) pyramids or cubes.
  • a spherical-logarithmic vector quantization is, for example, from “ B. Matschkal and JB Huber, "Spherical logarithmic quantization", IEEE Trans. Audio, Speech, and Language Processing, vol. 18, pp. 126-140, Jan. 2010 "known, in particular from Chapter III, an example being disclosed in Chapter IV, in particular in 8 and 9 .
  • the hearing aid has a communication device for transmitting and / or receiving an audio signal.
  • the communication device comprises a transmitter or a receiver.
  • the communication device is suitable and is provided and set up to carry out a method for transmitting an audio signal from the transmitter or to the receiver.
  • the method provides for an input signal corresponding to the audio signal to be divided into a number of channels for a specific time window on the transmitter side, and for a current channel value to be assigned to each channel on the transmitter side.
  • a number of forecast values are created on the basis of previous channel values which are assigned to a temporally preceding time window, each current channel value being assigned one of the forecast values, and a reference value is determined on the transmitter side.
  • one of the forecast values is assigned a gain factor determined on the basis of the reference value, and the current channel value assigned to this forecast value is changed to an adapted channel value by means of the gain factor.
  • the adapted channel value is assigned to an adapted data set on the transmitter side. A transmission value corresponding to the adapted data record is transmitted from the transmitter to the receiver.
  • a number of forecast values on the receiver side are created, one of the forecast values on the receiver side being assigned to the reconstructed adapted channel value.
  • a receiver-side reference value, in particular the receiver-side forecast values is determined in particular on the receiver side, and a receiver-side amplification factor is assigned to the reconstructed adapted channel value on the receiver side, which is preferably determined on the basis of the receiver-side reference value.
  • the reconstructed adapted channel value is changed to a reconstructed channel value by means of the receiver-side amplification factor.
  • the reconstructed channel value is combined on the receiver side to form a reconstructed output signal.
  • the communication device only includes the transmitter, only the transmitter-side work steps and a work step for transmitting the deviations are carried out. If the communication device only has the receiver, in particular only the work steps on the receiver side and a work step for receiving the deviations are carried out.
  • the transmission is expediently carried out wirelessly, for example inductively or by means of radio.
  • the hearing aid preferably comprises a sensor, by means of which an audio signal is recorded during operation.
  • the sensor is preferably an electromechanical sound transducer, such as a microphone.
  • the input signal is the audio signal, or the input signal is generated on the basis of the audio signal.
  • the input signal is part of the audio signal or corresponds to a specific frequency range of the audio signal.
  • the hearing device comprises, for example, a signal processing unit and / or filter.
  • the hearing aid preferably comprises an amplifier circuit, by means of which the audio signal / output signal / reconstructed output signal can be amplified.
  • the hearing aid preferably comprises an actuator, by means of whose sound signal is generated, such as a loudspeaker, and which is suitable for outputting the output signal or the reconstructed output signal, and is provided and suitable, for example.
  • the hearing aid is a headphone or comprises a headphone.
  • the hearing aid is particularly preferably a hearing aid.
  • the hearing aid is used to support a person suffering from impaired hearing.
  • the hearing aid is a medical device, by means of which, for example, a partial hearing loss is compensated for.
  • the hearing aid is, for example, a "receiver-in-the-canal” hearing aid (RIC; Ex-Hörer hearing aid), an in-the-ear hearing aid, such as an "in-the-ear” hearing aid, an "in-the” -canal "- hearing aid (ITC) or a” complete-in-canal "hearing aid (CIC), a pair of hearing glasses, a pocket hearing aid, a bone conduction hearing aid or an implant.
  • the hearing aid device is particularly preferably a behind-the-ear hearing aid device (“behind-the-ear” hearing aid device) which is worn behind an ear cup.
  • the hearing aid is in particular provided and set up to be worn on the human body.
  • the hearing aid preferably comprises a holding device, by means of which attachment to the human body is possible.
  • the hearing aid is provided and configured to be arranged, for example, behind the ear or within an auditory canal.
  • the hearing aid is wireless and is intended and set up to be inserted at least partially into an auditory canal.
  • the hearing aid is a component of a hearing aid system that includes a further hearing aid or a further device, such as a directional microphone or another device that has a microphone.
  • the device preferably comprises the transmitter and the hearing device the receiver, and the transmission of the audio signal between the transmitter and the receiver takes place in accordance with the method.
  • the hearing aid system preferably comprises two hearing aids, each of which has a communication device that is used to transmit and / or receive one Audio signal are provided and set up according to the above method.
  • the hearing aid system is suitable as well as provided and set up to transmit audio signals between the two hearing aids by means of their respective communication devices, the above method being carried out.
  • each of the communication devices has a transmitter and a receiver, and the audio signals are transmitted between the two communication devices, at least from one of the hearing aids to the remaining one.
  • the transmission is expediently carried out wirelessly, for example inductively or by means of radio.
  • the hearing aid system is particularly preferably a hearing aid system.
  • the hearing aid system is used to support a person suffering from impaired hearing.
  • the hearing aid system is a medical device, by means of which, for example, a partial hearing loss is compensated for.
  • the hearing aid system expediently comprises a behind-the-ear hearing aid that is worn behind an ear cup, a “receiver-in-the-canal” hearing aid (RIC; ex-hearing aid), an in-ear hearing aid, such as an "in-the-ear” hearing aid, an "in-the-canal” hearing aid (ITC) or a "complete-in-canal” hearing aid (CIC), hearing glasses, a pocket hearing aid, a bone conduction hearing aid or but an implant.
  • the hearing aid system is in particular provided and set up to be worn on the human body.
  • the hearing aid system preferably comprises a holding device, by means of which attachment to the human body is made possible.
  • the hearing aid system is a hearing aid system
  • at least one of the hearing aids is provided and set up, for example to be arranged behind the ear or within an auditory canal.
  • the hearing aid system is wireless and is intended and set up to be inserted at least partially into an auditory canal.
  • the hearing aid system particularly preferably comprises an energy store, by means of which an energy supply is provided.
  • the invention provides in particular that the audio signal is broken down into frequency channels.
  • a vector is then formed a set of channel values and a reference value, and the application of a gain factor to all elements of the vector, the gain factors preferably differing. If the reference value is a current channel value, no amplification factor is preferably applied to this.
  • the gain factor is calculated as a function of previous (past, "reconstructed") channel values and therefore the use of information that is available both on the transmitter and receiver side.
  • the preceding channel value is understood here to mean, for example, a quantized channel value or a reconstructed channel value in the sense of predictive coding (that is to say as the sum of deviation and forecast).
  • the channel values adjusted in this way are vector quantized.
  • the inverse gain factor is then applied to the now quantized values.
  • FIG. 1 A hearing aid system 2 is shown with two identical hearing aid devices 4, which are provided and set up to be worn behind an ear of a user.
  • each is a behind-the-ear hearing aid ("behind-the-ear" hearing aid) which has a sound tube, not shown, which is inserted into the ear.
  • Each hearing aid 4 comprises a housing 6, which is made of a plastic.
  • a microphone 8 with two electromechanical sound transducers 10 is arranged within the housing 6.
  • the two electromechanical sound transducers 10 make it possible to change a directional characteristic of the microphone 8 by changing a time offset between the acoustic signals detected by means of the respective electromechanical sound transducer 10.
  • the two electromechanical sound transducers 10 are coupled in terms of signal technology to a signal processing unit 12, which comprises an amplifier circuit.
  • the signal processing unit 12 is formed by means of circuit elements, such as electrical and / or electronic components.
  • a loudspeaker 14 is coupled to the signal processing unit 12 for signaling purposes, by means of which the audio signals 16 recorded with the microphones 8 and / or processed by the signal processing unit 12 are output as sound signals. These sound signals are conducted into the ear of a user of the hearing aid system 2 by means of the sound tube (not shown).
  • Each of the hearing aids 4 also has a transmitter 18 and a receiver 20, by means of which data signals 22 are exchanged between the two hearing aids 4.
  • the exchange takes place wirelessly, for example by radio or inductively.
  • the signal processing unit 12, the transmitter 18 and the receiver 20 each together essentially form a communication device 24.
  • the exchange of the data signals 22 makes it possible to convey a spatial sense of hearing to the wearer of the hearing aid system 2.
  • the hearing aid system 2 is binaural.
  • FIG. 2 A method 26 is shown, according to which the audio signals 16 are transmitted between the two hearing aids 4 by means of their respective communication device 24.
  • the audio signal 16 is received by means of one of the hearing aids 4.
  • an input signal 32 is generated therefrom, which consequently corresponds to the audio signal 16 and which in Figure 3 is shown as an example.
  • the audio signal 16 is particularly filtered.
  • the input signal 32 is divided into time windows 34 which have the same length in time and which is, for example, one millisecond. As soon as the last time window 34 has ended, this time window 34 is divided into a number of channels 36, for example in Figure 4 shown.
  • the channels 36 are frequency channels, and frequency pass filters 38, which are present within the signal processing unit 16, are used to divide the input signal 32 into the individual frequency channels 36. Furthermore, the input signal 32 comprises only the channels 36, whereas the audio signal 16 has the channels 36 and still further frequency channels. A certain current channel value 40 is assigned to each of the frequency channels 36. In summary, in the second work step 30, the input signal 32 is divided into the individual frequency channels 36 and discretized by means of the assignment of the current channel value 40.
  • a third work step 42 is carried out, in which channel values 44 preceding in time are filled. These have been determined, for example, in a previous run of method 26 or, if method 26 has not yet been carried out, standard values are used for this, such as zero (0).
  • a fourth work step 46 is also carried out on the part of the receiver 20, in which reconstructed previous channel values 48 are determined. These correspond to the temporally preceding channel values 44 and are determined in the same way as the temporally preceding channel values 44.
  • Fig. 5 The current channel values 40 are shown, each of which is assigned to a channel 36.
  • One of the current values 40 is comparatively large. If spherical logarithmic quantization were applied to the input signal 32, a first noise level 50 would be introduced due to the increased current channel value 40, which is largely larger than the remaining current channel values 40, so that these would be excessively falsified.
  • a number of forecast values 54 is therefore created on the transmitter side using the preceding channel values 44, each of the forecast values 54 being assigned to one of the channels 36 and thus also to one of the current channel values 40, as in FIG Fig. 6 shown.
  • the preceding channel value 44 assigned to the same channel 36 is used as the forecast value 54.
  • a reference value 58 of the forecast values 54 is determined, the maximum of the forecast values 54 being used as the reference value 58. In other words, the largest of the forecast values 54 and thus the largest of the previous channel values 44 are determined.
  • a gain factor 62 is assigned to the other forecast values 54 in a seventh work step 60, the gain factors 62 differing. Gain factors 62 are thus assigned to the channels 36 for the time window 34, each of the gain factors 62 being assigned to exactly one of the current channel values 40 - with the exception of the current channel value 40 to which the reference value 58 is assigned.
  • Gi is the gain factor 62 that corresponds to the channel 36 associated with the index i.
  • ⁇ L i denotes the difference 64 between the reference value 58 and the forecast value 54, which is assigned to the channel 36 with the index i. Consequently, all of the amplification factors 62 differ and the respective amplification factor 62 is created on the basis of the respectively assigned forecast value 54 to which the amplification factor 62 is assigned.
  • each of the current channel values 40 is modified by means of the gain factor 54 that is assigned to the respectively assigned forecast value 54 and created on the basis thereof.
  • each of the current channel values 40 with the exception of that current channel value 40 to which the reference value 58 is assigned and to which consequently none of the amplification factors 62 is assigned, is changed to an adapted channel value 70.
  • the respective current channel value 40 is multiplied by the respectively assigned gain factor 62, as for example schematically in FIG Fig. 8 shown.
  • the respective gain factor 54 is thus selected such that a deviation between the assigned forecast value 54 and the reference value 58 would be greater than a deviation between the reference value 58 and the forecast value modified by means of the gain factor 54. Since the current channel values 40 usually deviate only comparatively slightly from the respective temporally preceding channel value 44, the deviation between the current channel value 40, to which the reference value 58 is assigned, and the adapted channel values 70 is also reduced.
  • the adapted channel values 70 and the current channel value 40 to which the reference value 58 is assigned are assigned to an adapted data set 72, which is therefore a vector which has as many elements as there are current channel values 40.
  • the adapted data set 72 is quantized by means of spherical logarithmic quantization and a transmission value 76 is formed, which is consequently one-dimensional.
  • the transmission value 76 is created by means of quantization of the adapted data set 72, the spherical logarithmic quantization being used as the quantization. Due to the quantization, a second noise level 78 is introduced into the adapted data set 72.
  • the transfer value 76 is transmitted to the remaining hearing aid 4 as part of the data signal 22.
  • the transmission value 76 is received by means of the receiver 20 and a tenth work step 80 is carried out, in which a reconstructed adapted data record 82 is created on the receiver side based on the transmission value 76 Fig. 9 is shown. With the exception of any noise that was introduced due to the quantization, this corresponds to the adapted data record 72.
  • the reconstructed adapted data record 82 has a number of reconstructed adapted channel values 84 corresponding to the number of adapted channel values 70, each of the reconstructed adapted channel values 84 Channel values 84 correspond to one of the adapted channel values 70 and correspond in particular to this.
  • the reconstructed adapted data record 82 has a reconstructed unmatched channel value 86, which corresponds to the current channel value 40 assigned to the reference value 58 of the forecast values 54 and is therefore essentially the only current channel value 40 which, with the exception of the quantization, is essentially unchanged on the part of the Transmitter 18 has been transmitted to the receiver 20 side.
  • a number of receiver-side forecast values 90 are generated on the receiver side using the reconstructed previous channel values 48, with one of the receiver-side forecast values 90 being assigned to the reconstructed adapted channel values 84 and the reconstructed unmatched channel value 86.
  • a maximum of the receiver-side forecast values 92 is determined, and in this way the reconstructed unadjusted channel value 86 is identified within all the values of the reconstructed adapted data record 82.
  • the receiver-side forecast values 90 and the receiver-side maximum of the receiver-side forecast values 90 are determined on the receiver-side gain factors 96.
  • Each of the receiver-side amplification factors 96 is assigned to one of the reconstructed adapted channel values 84 and to the respective forecast-side values 90 on the receiver side. Because the reconstructed previous channel values 48 essentially correspond to the previous channel values 44, the forecast values 54 and the receiver-side forecast values 90 correspond. To determine the receiver-side gain factors 96, the same calculation rule is used as for the determination of the gain factors 62, which is present on the transmitter 18 side. The receiver-side gain factor 96, which corresponds to the transmitter-side gain factor 62, is assigned to the same channel 36.
  • the eleventh, twelfth and thirteenth work steps 88, 92, 94 essentially correspond to the fifth, sixth and seventh work steps 52, 56, 60, but different input data are used, namely the channel values 44 preceding in time and the reconstructed previous values 44 other times Channel values 48, which, however, are the same due to the fourth work step 46 and the third work step 42.
  • Each gain factor 62 is thus equal to the transmitter-side gain factor 96, which is assigned to the same channel 36 in each case. It is not necessary to transmit the gain factor 96 from the transmitter 18 side to the receiver 20 side.
  • each of the reconstructed adapted channel values 84 is modified on the receiver side by means of the respectively assigned receiver-side gain factor 96 to a reconstructed channel value 100 and combined with the reconstructed unadjusted channel value 86 to form a reconstructed output signal 102, which thus, with the exception of noise introduced due to quantization corresponds to current channel values 40 which are present on the transmitter 18 side. Due to the quantization, there is a third noise level 104 which is different for each of the channels 36. Thus, the third noise level 104 is in each case below the reconstructed channel value 100 or the reconstructed unmatched channel value 86, which is why audio quality is increased.
  • the reconstructed output signal 102 is at least partially used as the reconstructed previous channel values 48. This is reconstructed in a subsequent fifteenth work step 106 Output signal 102 is transferred into the time domain and output by means of the loudspeaker 14.
  • a sixteenth step 108 is carried out on the transmitter 18 side, in which channel values 110 reconstructed on the transmitter side and an unadjusted channel value 112 reconstructed on the transmitter side are created on the basis of the transmission value 76 and the amplification factors 62, which correspond to the reconstructed channel values 100 and the reconstructed unadjusted channel value 86 correspond.
  • the reconstructed output signal 102 is also generated on the transmitter 18 side.
  • the channel values 110 reconstructed on the transmitter side and the non-matched channel value 112 reconstructed on the transmitter side are used as the temporally preceding channel values 44 in the case of a subsequent transmission. In this way, any deviation, which is present in the reconstructed output signal 102 due to the spherical logarithmic quantization, is also present on the receiver 18 side, which is why a deviation is reduced in a subsequent transmission.

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Claims (13)

  1. Procédé (26) de transmission d'un signal audio (16) d'un émetteur (18) vers un récepteur (20), procédé dans lequel
    - du côté émetteur, un signal d'entrée (32) correspondant au signal audio (16) est divisé en un certain nombre de canaux de fréquence (36) pour une fenêtre temporelle spécifique (34),
    - du côté émetteur, une valeur de canal actuelle (40) est associée à chaque canal de fréquence (36), la valeur de canal actuelle (40) étant une amplitude et/ou une phase ou un niveau de signal,
    - du côté émetteur, un certain nombre de valeurs de prévision (54) est créé sur la base de valeurs de canal précédentes (44) qui sont associées à une fenêtre temporelle (34) temporellement antérieure, l'une des valeurs de prévision (54) étant associée à chaque valeur de canal actuelle (40),
    - du côté émetteur, une valeur de référence (58) est déterminée,
    - du côté émetteur, un facteur de gain (62) déterminé sur la base de la valeur de référence (58) est associé à l'une des valeurs de prévision (54) et la valeur de canal actuelle (40) associée à cette valeur de prévision (54) est changée en une valeur de canal adaptée (70) au moyen du facteur de gain (62),
    - du côté émetteur, la valeur de canal adaptée (70) est associée à un ensemble de données adapté (72) de façon à comporter la valeur de canal adaptée (70), l'ensemble de données adapté (72) comportant autant de valeurs qu'il y a de valeurs de canal actuelles (40),
    - une valeur de transmission (76) correspondant à l'ensemble de données adapté (72) est transmise de l'émetteur (18) au récepteur (20),
    - du côté récepteur, un ensemble de données adapté reconstruit (82) est créé avec une valeur de canal adaptée reconstruite (84), qui correspond à la valeur de canal adaptée (44), sur la base de la valeur de transmission (76),
    - du côté récepteur, un certain nombre de valeurs de prévision côté récepteur (90) est créé sur la base de valeurs de canal précédentes reconstruites (48), l'une des valeurs de prévision côté récepteur (90) étant associée à la valeur de canal adaptée reconstruite (84),
    - du côté récepteur, une valeur de référence (58) est déterminée,
    - du côté récepteur, un facteur de gain côté récepteur (96) est associé à la valeur de canal adaptée reconstruite (84) sur la base de la valeur de prévision côté récepteur (90) associée,
    - du côté récepteur, la valeur de canal adaptée reconstruite (84) est changée en une valeur de canal reconstruite (100) au moyen du facteur de gain côté récepteur (96), et
    - du côté récepteur, la valeur de canal reconstruite (100) est ajoutée à un signal de sortie reconstruit (102),
    le facteur de gain (62) et le facteur de gain côté récepteur (96) étant créés sur la base de la valeur de prévision (54) à laquelle le facteur de gain (62) est associé, ou sur la base de la valeur de prévision côté récepteur (90) qui est associée à la valeur de canal adaptée reconstruite (84) et le facteur de gain (62) étant créé sur la base de la différence (64) entre la valeur de référence (58) et la valeur de prévision (54) .
  2. Procédé (26) selon la revendication 1,
    caractérisé en ce que
    le maximum des valeurs de prévision (54) est utilisé comme valeur de référence (58).
  3. Procédé (26) selon la revendication 2,
    caractérisé en ce que
    - du côté émetteur, la valeur de canal actuelle (40), à laquelle le maximum (58) des valeurs de prévision (54) est associé, est associée à l'ensemble de données adapté (72),
    - du côté récepteur, l'ensemble de données adapté reconstruit (82), comprenant la valeur de canal adaptée reconstruite (84) qui correspond à la valeur de canal adaptée (44) et une valeur de canal non adaptée reconstruite (86) qui correspond à la valeur de canal actuelle (40) associée au maximum (58) des valeurs de prévision (54), est créé sur la base de la valeur de transmission (76) et
    - du côté récepteur, la valeur de canal reconstruite (100) et la valeur de canal non adaptée reconstruite (86) sont combinées pour former le signal de sortie reconstruit (102).
  4. Procédé (26) selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le facteur de gain (54) est sélectionné de telle sorte qu'un écart entre la valeur de prévision (54) qui lui est associée et la valeur de référence (58) soit supérieur à un écart entre la valeur de référence (54) et la valeur de prévision (54) modifiée au moyen du facteur de gain (62).
  5. Procédé (26) selon l'une des revendications 1 à 4,
    caractérisé en ce que
    la valeur de canal précédente (44) associée au même canal de fréquence (36) est utilisée comme valeur de prévision (54).
  6. Procédé (26) selon l'une des revendications 1 à 5,
    caractérisé en ce que chacune des autres valeurs de prévision (54) est associée à un facteur de gain (62), les facteurs de gain (62) étant en particulier différents.
  7. Procédé (26) selon l'une des revendications 1 à 6,
    caractérisé en ce que
    la division du signal d'entrée (32) en les canaux de fréquence (36) est effectuée au moyen de filtres passebande (38).
  8. Procédé (26) selon l'une des revendications 1 à 7,
    caractérisé en ce que
    la valeur de transmission (76) est créée par quantification de l'ensemble de données adapté (72).
  9. Procédé (26) selon la revendication 8,
    caractérisé en ce que
    du côté émetteur, une valeur de canal reconstruite côté metteur (110), qui correspond à la valeur de canal reconstruite (100) et qui est utilisée comme l'une des valeurs de canal temporellement précédentes lors d'une transmission temporellement ultérieure (44), est créée sur la base de la valeur de transmission (76) et du facteur de gain (62).
  10. Procédé (26) selon la revendication 8 ou 9,
    caractérisé en ce que
    le vecteur de quantification est utilisé pour la quantification.
  11. Procédé (26) selon l'une des revendications 8 et 9,
    caractérisé en ce que
    une quantification logarithmique sphérique est utilisée pour la quantification.
  12. Appareil auditif (4), notamment aide auditive, comprenant un dispositif de communication (24) qui est prévu et conçu pour émettre et/ou recevoir un signal audio (16) selon un procédé (26) de l'une des revendications 1 à 11.
  13. Système d'appareils auditifs (2) comprenant deux appareils auditifs (4) selon la revendication 12, lequel système est prévu et conçu pour transmettre des signaux audio (16) entre les deux appareils auditifs (4) au moyen de leurs dispositifs de communication (24) selon un procédé (26) de l'une des revendications 1 à 11.
EP17155426.4A 2016-04-25 2017-02-09 Procédé de transfert d'un signal audio Active EP3240307B1 (fr)

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US5479522A (en) * 1993-09-17 1995-12-26 Audiologic, Inc. Binaural hearing aid
JP2970498B2 (ja) * 1995-10-26 1999-11-02 日本電気株式会社 ディジタル補聴器
US7299190B2 (en) * 2002-09-04 2007-11-20 Microsoft Corporation Quantization and inverse quantization for audio
KR101428487B1 (ko) * 2008-07-11 2014-08-08 삼성전자주식회사 멀티 채널 부호화 및 복호화 방법 및 장치
US8311843B2 (en) * 2009-08-24 2012-11-13 Sling Media Pvt. Ltd. Frequency band scale factor determination in audio encoding based upon frequency band signal energy
EP2897382B1 (fr) * 2014-01-16 2020-06-17 Oticon A/s Amélioration des sources binaurales
EP2919483B1 (fr) * 2014-03-11 2019-05-08 Oticon Medical A/S Système d'assistance auditive bilatérale et procédé d'adaptation d'un tel système
DE102016206327A1 (de) * 2016-04-14 2017-10-19 Sivantos Pte. Ltd. Verfahren zum Übertragen eines Audiosignals von einem Sender zu einem Empfänger

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