EP2622879A1 - Verfahren und vorrichtung zur frequenzkompression - Google Patents
Verfahren und vorrichtung zur frequenzkompressionInfo
- Publication number
- EP2622879A1 EP2622879A1 EP10763664.9A EP10763664A EP2622879A1 EP 2622879 A1 EP2622879 A1 EP 2622879A1 EP 10763664 A EP10763664 A EP 10763664A EP 2622879 A1 EP2622879 A1 EP 2622879A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- amplitude
- frequency
- compression
- audio signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
- H04R25/35—Electric hearing aids 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
Definitions
- the present invention relates to a process for Fre ⁇ quenzkompression an audio signal at a listening device. Moreover, the present invention relates to an ent ⁇ speaking device for frequency compression.
- a hearing device is understood to mean any sound-emitting device which can be worn in or on the ear, in particular a hearing aid, a headset, headphones and the like.
- Hearing aids are portable hearing aids that are used to care for the hearing impaired.
- different types of hearing aids such as behind-the-ear hearing aids (BTE), hearing aid with external receiver (RIC: receiver in the canal) and in-the-ear hearing aids (IDO), e.g. Concha hearing aids or canal hearing aids (ITE, CIC).
- BTE behind-the-ear hearing aids
- RIC hearing aid with external receiver
- IDO in-the-ear hearing aids
- ITE canal hearing aids
- the hearing aids listed by way of example are worn on the outer ear or in the ear canal.
- bone conduction hearing aids, implantable or vibrotactile hearing aids are also available on the market. The stimulation of the damaged hearing takes place either mechanically or electrically.
- Hearing aids have in principle as essential components an input transducer, an amplifier and an output transducer.
- the input transducer is usually a sound receiver, z. As a microphone, and / or an electromagnetic receiver, for. B. an induction coil.
- the output transducer is usually used as an electroacoustic transducer, z. As miniature speaker, or as an electromechanical transducer, z. B. bone conduction, realized.
- the amplifier is usually integrated in a signal processing unit. This basic structure is shown in FIG. 1 using the example of a behind-the-ear hearing device. In a hearing aid housing 1 for carrying behind the ear, one or more microphones 2 for receiving the sound from the environment are installed.
- a signal Processing unit 3 which is also integrated in the hearing aid housing 1, processes the microphone signals and ver ⁇ strengthens them.
- the output signal of the signal processing unit 3 is transmitted to a loudspeaker or earpiece 4, which outputs an acoustic signal.
- the sound is optionally transmitted via a sound tube, which is fixed with an earmold in the ear canal, to the eardrum of the equipment wearer ⁇ gene.
- the power supply of the hearing aid and in particular the signal processing unit 3 is carried out by a likewise integrated into the hearing aid housing 1 battery. 5
- Dead regions are frequency ranges in which spectral components can no longer be audibly amplified.
- spectral components from a source frequency range which is typically at higher frequencies and in which no amplification is to be applied (eg "dead region"), are pushed into a lower-lying target frequency range gain
- Known frequency compression can be applied usefully for example, function as follows. It is a compression requirement for an individual hearing loss tailored, wherein the Kompres ⁇ sion regulations define which source frequency is to be on which target frequency compressed or mapped the practical realization of this compression procedure carried out by a filter bank. . that is, the compression rule defi ned ⁇ which source channel of the filter bank to which the target channel mapped or compressed. the smallest element So this process is a channel. This means that the spectral components within a channel are not compressed.
- the possible positions of the channels are defined by the structure of the filter bank and thus fixed (fixed filter bank grid).
- a speech ⁇ sound is voiced sounds in front of a fundamental frequency and multiple harmonics, which are found at integer multiples of the fundamental frequency. This is called the fine structure of the signal.
- the fine structure is responsible for the perception of the pitch of the speech sound.
- the Ampli ⁇ amplitudes of the fundamental frequency and the harmonics define the color of the sound, and form the so-called spectral A ⁇ hüllende.
- the spectral envelope of vowels shows a typical formant structure in each case.
- the spektra ⁇ le envelope carries the essential information which allows the Un ⁇ terscheidung the different sounds (eg distinc- tion of vowels).
- prior art frequency compression is accomplished by shifting source channels on a fixed filter bank grid.
- the fixed filter bank raster is defined by the filter bank structure and not by the harmonic structure of the signal. Therefore, movement of source channels on the fixed filter bank grid to their destination channels in accordance with the compression rule destroys the harmonic structure.
- the reason for this is that when you move the harmonic structure just be ⁇ is not taken into account. This means that the harmonics no longer inevitably occur at integer multiples of the fundamental frequency after compression. The destruction of the harmonic structure, however, leads to audible artifacts.
- the object of the present invention is therefore to be able to better avoid artifacts in the frequency compression.
- this object is achieved by a method for frequency compression of an audio signal in a listening device, by obtaining an amplitude information of a source channel of a plurality of frequency channels of the audio signal and impressing an amplitude corresponding to the Amplitudeninforma ⁇ tion to a signal in a target channel of the plurality of frequency channels, to which the source channel is mapped in the frequency compression.
- the invention provides an on ⁇ direction of the frequency compression of an audio signal for a listening device, comprising an estimating means for obtaining an amplitude information of a source channel of a plurality of frequency channels of said audio signal and processing means for impressing an amplitude corresponding to the amplitude information to a signal in a target channel of the plurality of frequency channels to which the source channel for Fre ⁇ Compression compression is to map.
- the amplitude information in a source channel of an audio signal is separated from the actual signal and used to impose a corresponding amplitude ei ⁇ nem signal in a target channel. Frequencies in the target channel are not affected thereby, whereby the har ⁇ monic structure of the audio signal can be maintained.
- the amplitude information may be a mean channel amplitude. This is easy to win for one channel and can transmit as well with little effort to a target channel ⁇ to.
- the amplitude information is a spectral model of the audio signal
- the spectral model is subjected to the pression Frequenzkom- and the signal of the target channel
- ⁇ formative amplitude is determined from the compressed spectral model.
- the spectral model is ⁇ example, be the spectral envelope, resulting from the Ampiitu- the fundamental frequency and harmonic of a harmonic signal.
- the spectral model thus represents a function that models the amplitude values over the frequency.
- the réelle josgende amplitude for the target channel can be obtained by Ab ⁇ keys of the compressed spectral model.
- the amplitude for a specific frequency is obtained from the compressed spectral model or the compressed spectral envelope.
- the impressed to amplitude can be obtained alternatively by integral ⁇ or summation of values of the compressed spectral model within the range of the target channel.
- a medium amplitude value for the target channel from the Spekt ⁇ ralmodell is determined.
- the spectral model of the audio signal is obtained for each of the at least one channel Frequenzkanä ⁇ le amplitude and the channel amplitudes.
- at least one value per frequency channel is provided for the spectral model.
- the spectral model can be obtained by interpolation (spline).
- the individual points are linear
- the spectral model can also be a polynomial function.
- the spectral model or the spectral envelope is simulated by an analytical function. From this in turn, amplitude values can be obtained without high computational effort.
- the spectral model can also be obtained by an LPC analysis (li ⁇ near predictive coefficient) in the time domain. This can be dispensed with a filter bank.
- the device for the frequency compression has a polyphase filter bank to deliver the audio signal in several frequency channels ⁇ ready. This makes it possible to generate only positive frequency components in the channels.
- the device according to the invention is particularly advantageously used in a listening device and in particular in a hearing aid.
- frequency compression in Hörgerä ⁇ teierin can be realized with fewer artifacts.
- FIG. 1 shows the basic structure of a hearing aid according to the
- FIG. 3 shows the spectral model of FIG. 2 after the compression
- the main object of the present invention is to leave the spectral fine structure, in particular of a harmonic signal, untouched by subjecting only the amplitude information of a spectrum to compression.
- a spectral envelope which represents a measure of the magnitude of the amplitude in the spectrum, is compressed.
- the providedssig ⁇ nal is spectrally dispersed by means of a filter bank.
- a corresponding calculated channel strength For each channel participating in the compression process, a corresponding calculated channel strength. Examples of channel strengths are the amplitude, the square of the amplitude or any other measure of the power or strength of the signal in the entspre ⁇ sponding channel.
- the channel strengths can be interpreted as samples of the spectral envelopes that are to be compressed.
- the channel strength represents an amplitude information in the sense of the present application.
- the compression is achieved by shifting the channel strengths from the source channels to the destination channels according to a predetermined compression rule.
- the original channel strengths of the destination channel (before compression) will be overwritten. That is, according to the present invention, the phase of an original signal (before compression) is maintained in the target channel. Only the channel strengths are modified. Thus, for example, after the filter bank, the envelope is impressed on the respective signals, and the phases are retained.
- the compression rule according to the vorlie ⁇ constricting invention is similar to the compression provision of a compression system according to the prior art.
- the sub ⁇ difference between the approach according to the prior art and the inventive approach is that only the channel strengths are shifted according to the inventive approach, while the complete channel signals are shifted in the approach according to the prior art. In the approach according to the invention, therefore, the spectral fine structure is retained. A harmonic remains a harmonic. If necessary, only its amplitude is varied.
- the obtained spectral model (such as an envelope or envelope).
- This spectral model is at ⁇ example by linear interpolation, quadratic Inter ⁇ polation, cubic interpolation or by analytical Mo- obtained using a polynomial function.
- the spectral model or the envelope is compressed according to the compression rule ⁇ .
- the compressed spectral model is used to calculate the strengths of the target channels.
- the phases of the destination channels are not modified as in the first implementation variant described above.
- FIG. 2 shows a spectral model of an input signal of a hearing device.
- the channel strength (e.g., amplitude, power, etc.) is plotted for each of the frequency channels 10 over the frequency f.
- the respective channel strength is symbolized by a point 11.
- Neighboring points 11 are each by a
- the spectral envelope 12 thus represents a spectral model of the input signal.
- a high-frequency portion 13 of the entire spectrum is to be compressed.
- the compression starts at a frequency f_cut_off.
- the range to be compressed ranges from this frequency f_cut_off to the highest processed frequency channel.
- the channels in the compression area 13 may be referred to as source channels 14 for frequency compression.
- f_cut_off is the linearly interpolated curve of Figure 2 ent ⁇ speaking compresses the compression rule to significantly less frequency channels.
- the structure of the envelope is Although in terms of the amplitude sequence, remained essentially he ⁇ hold, but the curve was compressed in the frequency direction. The highest frequency f_max 'after the compression is thus below the frequency f_max in the uncompressed case according to FIG. 2. However, this also means that a large number of source channels 14 are mapped onto fewer destination channels 15. The target channels 15 each have the same width as a source channel 14. The channel structure is therefore unaffected by the compression. From the compressed envelope 12 '(compressed spectral model), the channel strength can thus be determined for each target channel 15, as will be shown with reference to the examples of FIG. 4 and FIG.
- the compressed envelope 12 ' is scanned. It can already be seen here that the sampled values are not necessarily at the break points of the compressed envelope 12 '. Thus, it is not the strength of a source channel 14 that maps exactly to the strength of a target channel 15. Rather, the value for the channel strength of the target channel is obtained directly from the sample, which results at the respective channel center of the compressed envelope 12 '.
- the sampling may also be performed at a different frequency position within each destination channel 15. Thus, for example, the sampling can also take place at a channel boundary.
- the value of a destination channel 15 is determined in another way. Namely, it is determined by averaging based on an integral or a sum of all values of the compressed envelope 12 'within each channel. The respective mean value 16 is then a measure of the strength of the target channel 15. Again, the channel structure and in particular the distance between harmonics of the frequency compression remains unaffected. The amplitude of the spectral components in komp ⁇ rim convinced range is only adjusted or changed. According to a modified embodiment, the decomposition of the input signal into the spectral fine structure and the spectral envelope can also be performed by means of an LPC (linear predictive coefficient) analysis and calculating the residual signal in the
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2010/064480 WO2012041373A1 (de) | 2010-09-29 | 2010-09-29 | Verfahren und vorrichtung zur frequenzkompression |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2622879A1 true EP2622879A1 (de) | 2013-08-07 |
| EP2622879B1 EP2622879B1 (de) | 2015-11-11 |
Family
ID=44012481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10763664.9A Active EP2622879B1 (de) | 2010-09-29 | 2010-09-29 | Verfahren und vorrichtung zur frequenzkompression |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8923538B2 (de) |
| EP (1) | EP2622879B1 (de) |
| DK (1) | DK2622879T3 (de) |
| WO (1) | WO2012041373A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4051331A (en) | 1976-03-29 | 1977-09-27 | Brigham Young University | Speech coding hearing aid system utilizing formant frequency transformation |
| US6577739B1 (en) | 1997-09-19 | 2003-06-10 | University Of Iowa Research Foundation | Apparatus and methods for proportional audio compression and frequency shifting |
| DK1522206T3 (da) * | 2002-07-12 | 2007-11-05 | Widex As | Höreapparat og en fremgangmsåde til at forbedre taleforståelighed |
| AU2004201374B2 (en) * | 2004-04-01 | 2010-12-23 | Phonak Ag | Audio amplification apparatus |
| WO2006133431A2 (en) | 2005-06-08 | 2006-12-14 | The Regents Of The University Of California | Methods, devices and systems using signal processing algorithms to improve speech intelligibility and listening comfort |
| KR100678770B1 (ko) * | 2005-08-24 | 2007-02-02 | 한양대학교 산학협력단 | 궤환 신호 제거 기능을 구비한 보청기 |
| US8000487B2 (en) * | 2008-03-06 | 2011-08-16 | Starkey Laboratories, Inc. | Frequency translation by high-frequency spectral envelope warping in hearing assistance devices |
-
2010
- 2010-09-29 DK DK10763664.9T patent/DK2622879T3/da active
- 2010-09-29 EP EP10763664.9A patent/EP2622879B1/de active Active
- 2010-09-29 US US13/876,899 patent/US8923538B2/en active Active
- 2010-09-29 WO PCT/EP2010/064480 patent/WO2012041373A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012041373A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US8923538B2 (en) | 2014-12-30 |
| WO2012041373A1 (de) | 2012-04-05 |
| EP2622879B1 (de) | 2015-11-11 |
| DK2622879T3 (da) | 2016-02-15 |
| US20130188815A1 (en) | 2013-07-25 |
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