EP2437521B2 - Method for frequency compression with harmonic adjustment and corresponding device - Google Patents
Method for frequency compression with harmonic adjustment and corresponding device Download PDFInfo
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- EP2437521B2 EP2437521B2 EP11178306.4A EP11178306A EP2437521B2 EP 2437521 B2 EP2437521 B2 EP 2437521B2 EP 11178306 A EP11178306 A EP 11178306A EP 2437521 B2 EP2437521 B2 EP 2437521B2
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- 238000000034 method Methods 0.000 title claims description 10
- 230000006835 compression Effects 0.000 title description 25
- 238000007906 compression Methods 0.000 title description 25
- 238000013507 mapping Methods 0.000 claims description 11
- 230000005236 sound signal Effects 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 description 22
- 230000003595 spectral effect Effects 0.000 description 13
- 238000012937 correction Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000010370 hearing loss Effects 0.000 description 3
- 231100000888 hearing loss Toxicity 0.000 description 3
- 208000016354 hearing loss disease Diseases 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
- 210000000613 ear canal Anatomy 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 208000032041 Hearing impaired Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 210000000883 ear external Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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- 210000003454 tympanic membrane Anatomy 0.000 description 1
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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
- 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
- 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
- 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. B. miniature speakers, or as an electromechanical transducer, z. B. bone conduction, realized.
- the amplifier is usually integrated in a signal processing unit.
- FIG. 1 shown using the example of a behind-the-ear hearing aid.
- a hearing aid housing 1 for carrying behind the ear one or more microphones 2 for receiving the sound from the environment are installed.
- the object of the present invention is thus to further reduce artifacts in frequency compression.
- the first frequency channel is completely shifted into the second frequency channel. This allows, for example, a frequency channel from a dead region in an audible range of a hearing aid wearer move. If there is a harmonic in the first frequency channel, then it is completely shifted with the frequency channel. Their distance from the center frequency of the channel remains unchanged.
- the further shift to the first frequency in the second shift step takes place by amplitude modulation. This can be realized in the time domain by a simple multiplication by a factor exp (j ⁇ ⁇ ⁇ t).
- the harmonic in the first frequency channel represents a dominant frequency. This can be their position estimate relatively accurately before and after moving.
- Compression is channel-wise by copying selected channels of the original spectrum to lower-level channels.
- the channels usually have a different bandwidth than the distance f 0 between the harmonics.
- the harmonics 20 land when shifting to frequency positions outside the in FIG. 3 above shown line grid.
- FIG. 3 below shows such a compressed spectrum.
- the distances f 1 , f 2 between the individual lines 22, which represent the shifted harmonics, are no longer constant and in particular unequal to f 0 .
- the envelope 23 of the compressed spectrum shows in the compressed region the shifted formands 24 and 25 as they originate from the original spectrum, the spacing of the lines 22 is uneven, thus destroying the spectral fine structure and thus the structure of the harmonic signal. Corresponding artifacts are the result.
- the spectrum is compressed above the cutoff frequency f c .
- the envelope 23 of the compressed spectrum has the same shape as that of FIG. 3 below. Ie. also the formands 24 and 25 can be seen in the compressed area.
- the lines 26 of the spectrum in the compressed area above f c have the same distance f 0 as the lines or harmonics 20 in the non-compressed area. This means that the fine structure of the spectrum of the harmonic signal is unaffected by the compression. Accordingly, there are fewer artifacts.
- This step 33 corresponds to the compression according to the prior art of FIG. 3 , Accordingly, the harmonic 30 of the first frequency channel 31 is pushed onto the line 34, which is assigned a frequency f 34 (also referred to as second frequency hereinafter).
- the distance ⁇ f between the frequencies f 31 and f 30 is identical to the distance between the frequencies f 32 and f 34 .
- the frequency f 34 does not correspond to a harmonic of the fundamental frequency. Rather, would be at the frequency position f 35 in the second frequency channel 32 is a harmonic. This can be determined, for example, by a first frequency estimate in the target frequency range, ie in the second frequency channel 32, to which the first frequency channel 31 is imaged or shifted.
- the line 34 must therefore be shifted to the frequency f 35 in order to obtain the fine structure of the harmonic signal.
- the frequency structure of the still uncorrected compressed spectral components is estimated in a second estimation.
- the frequency f 34 of the line 34 is estimated or determined after the shift in the first step 33. From the two frequency estimates, the frequency offset, ie the distance between the frequencies f 34 and f 35 can be determined. The offset is compensated by means of a modulation in a second step 36, whereby the harmonic raster is restored.
- the line 34 is pushed to the frequency f 35 , resulting in the line 35 results.
- the modulation can be achieved for example on the basis of the analytical signal by multiplication with a suitable complex rotational factor.
- the shift by an angular frequency ⁇ 1 corresponds to a multiplication by the factor exp (j ⁇ ⁇ 1 ⁇ t).
- the resulting modulation corresponds to an amplitude modulation.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
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- Acoustics & Sound (AREA)
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Description
Die vorliegende Erfindung betrifft ein Verfahren zur Frequenzkompression eines Audiosignals, das eine Grundfrequenz und mindestens eine Harmonische besitzt, durch Bereitstellen des Audiosignals in mehreren Frequenzkanälen und Verschieben oder Abbilden der Harmonischen des Audiosignals von einem ersten Frequenzkanal der mehreren Frequenzkanäle in einen zweiten Frequenzkanal der mehreren Frequenzkanäle. Darüber hinaus wird eine entsprechende Vorrichtung zur Frequenzkompression beschrieben. Insbesondere ist eine derartige Vorrichtung einsetzbar in einer Höreinrichtung. Unter einer Höreinrichtung wird hier jedes im oder am Ohr tragbare schallausgebende Gerät, insbesondere ein Hörgerät, ein Headset, Kopfhörer und dergleichen verstanden.The present invention relates to a method of frequency-compressing an audio signal having a fundamental frequency and at least one harmonic by providing the audio signal in a plurality of frequency channels and shifting or mapping the harmonics of the audio signal from a first frequency channel of the plurality of frequency channels to a second frequency channel of the plurality of frequency channels. In addition, a corresponding device for frequency compression is described. In particular, such a device can be used in a listening device. A hearing device is understood here to be any sound-emitting device that can be worn in or on the ear, in particular a hearing device, a headset, headphones and the like.
Hörgeräte sind tragbare Hörvorrichtungen, die zur Versorgung von Schwerhörenden dienen. Um den zahlreichen individuellen Bedürfnissen entgegenzukommen, werden unterschiedliche Bauformen von Hörgeräten wie Hinter-dem-Ohr-Hörgeräte (HdO), Hörgerät mit externem Hörer (RIC: receiver in the canal) und In-dem-Ohr-Hörgeräte (IdO), z.B. auch Concha-Hörgeräte oder Kanal-Hörgeräte (ITE, CIC), bereitgestellt. Die beispielhaft aufgeführten Hörgeräte werden am Außenohr oder im Gehörgang getragen. Darüber hinaus stehen auf dem Markt aber auch Knochenleitungshörhilfen, implantierbare oder vibrotaktile Hörhilfen zur Verfügung. Dabei erfolgt die Stimulation des geschädigten Gehörs entweder mechanisch oder elektrisch.Hearing aids are portable hearing aids that are used to care for the hearing impaired. In order to meet the numerous individual needs, 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). The hearing aids listed by way of example are worn on the outer ear or in the ear canal. In addition, 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.
Hörgeräte besitzen prinzipiell als wesentliche Komponenten einen Eingangswandler, einen Verstärker und einen Ausgangswandler. Der Eingangswandler ist in der Regel ein Schallempfänger, z. B. ein Mikrofon, und/oder ein elektromagnetischer Empfänger, z. B. eine Induktionsspule. Der Ausgangswandler ist meist als elektroakustischer Wandler, z. B. Miniaturlautsprecher, oder als elektromechanischer Wandler, z. B. Knochenleitungshörer, realisiert. Der Verstärker ist üblicherweise in eine Signalverarbeitungseinheit integriert. Dieser prinzipielle Aufbau ist in
Viele Hörverluste können durch eine frequenzabhängige Verstärkung in Kombination mit einer Dynamikkompression ausgeglichen werden. Es gibt jedoch auch Hörverluste, bei denen eine Verstärkung keinen Effekt hat bzw. nachteilig ist. Ein Beispiel hierfür sind Hörverluste mit sog. "toten Regionen". Tote Regionen sind Frequenzbereiche, in denen Spektralanteile nicht mehr durch Verstärkung hörbar gemacht werden können.Many hearing losses can be compensated by a frequency-dependent amplification in combination with a dynamic compression. However, there are also hearing losses where amplification has no effect or is detrimental. An example of this is hearing loss with so-called "dead regions". Dead regions are frequency ranges in which spectral components can no longer be audibly amplified.
Eine mögliche Technik, um mit obigem Problem umzugehen, ist die Frequenzkompression. Hierbei werden Strahlanteile Spektralanteile aus einem Quellfrequenzbereich, der typischerweise bei höheren Frequenzen liegt und in dem keine Verstärkung angewendet werden soll (z. B. tote Region), in einen tieferliegenden Zielfrequenzbereich geschoben. In diesem Zielfrequenzbereich ist in der Regel Hörbarkeit prinzipiell gewährleistet, weswegen eine Verstärkung angewendet werden kann.One possible technique to deal with the above problem is frequency compression. In this case, beam components 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. Audibility is generally guaranteed in this target frequency range, which is why amplification can be used.
Es sind Hörgeräte bekannt, die eine derartige Frequenzkompression unterstützen. Bei dem Kompressionsverfahren werden beispielsweise die Eigenschaften einer Filterbank für eine einfache Implementierung genutzt. Es werden selektiv einzelne Kanäle, unter anderem abhängig von deren Momentanleistung, auf andere Kanäle kopiert, sodass die in diesen Kanälen enthaltenen Frequenzanteile am Ausgang verschoben in einem anderen Frequenzbereich wieder auftauchen. Wohin die Kanäle abgebildet werden, bestimmt eine Abbildungsvorschrift, die einstellbar ist, sodass verschiedene Kompressionsverhältnisse realisierbar sind.There are known hearing aids that support such frequency compression. In the compression method, for example, the properties of a filter bank for a easy implementation used. Individual channels are selectively copied to other channels, depending on their instantaneous power, for example, so that the frequency components contained in these channels reappear on the output in a different frequency range. Where the channels are shown determines a mapping rule, which is adjustable, so that different compression ratios can be realized.
Diese einfache Abbildungsvorschrift bringt bei Harmonischen Signalen Probleme mit sich. Harmonische Signale treten z. B. bei stimmhaften Lauten in der Sprache, beispielsweise bei Vokalen, auf. Hierbei hat das unkomprimierte Spektrum linienartige Struktur, wobei Spektrallinien bei der Sprachgrundfrequenz und bei deren ganzzahligen Vielfachen auftreten. Das Raster der harmonischen Signale (Linienstruktur) wird bei der einfachen Abbildungsvorschrift gemäß dem Stand der Technik nicht berücksichtigt und daher zerstört, d. h. die Spektrallinien treten nicht mehr garantiert auf einem ganzzahligen Vielfachen der Sprachgrundfrequenz auf. Dies äußert sich in deutlich wahrnehmbaren Artefakten (Signalanteile, die bei ganzzahligen Vielfachen der Grundfrequenz auftreten, werden hier kurz "Harmonische" genannt).This simple mapping rule poses problems with harmonic signals. Harmonic signals occur, for. For example, in voiced sounds in the language, such as vowels on. In this case, the uncompressed spectrum has a line-like structure, with spectral lines occurring at the speech fundamental frequency and at their integer multiples. The raster of the harmonic signals (line structure) is not considered in the simple mapping rule according to the prior art and therefore destroyed, d. H. the spectral lines are no longer guaranteed to be at an integer multiple of the speech fundamental frequency. This manifests itself in clearly perceptible artifacts (signal components occurring at integer multiples of the fundamental frequency are called "harmonics" for short).
Aus der Druckschrift
Darüber hinaus offenbart die Druckschrift
Die Aufgabe der vorliegenden Erfindung besteht somit darin, Artefakte bei der Frequenzkompression weiter zu reduzieren.The object of the present invention is thus to further reduce artifacts in frequency compression.
Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Frequenzkompression eines Audiosignals, das eine Grundfrequenz und mindestens eine Harmonische besitzt, nach Anspruch 1.According to the invention this object is achieved by a method for frequency compression of an audio signal having a fundamental frequency and at least one harmonic, according to
Es erfolgt beim oder nach dem Verschieben bzw. Abbilden der Harmonischen in einen anderen Frequenzkanal eine harmonische Korrektur. Dies bedeutet, dass die Harmonische auf eine Frequenzposition gesetzt wird, die ebenfalls ein ganzzahliges Vielfaches der Grundfrequenz darstellt. Damit stellt die Harmonische auch nach dem Verschieben eine Harmonische dar. Dies reduziert die Artefakte deutlich.There is a harmonic correction during or after shifting or mapping the harmonics into another frequency channel. This means that the harmonic is set to a frequency position, which is also an integer multiple of the fundamental frequency. Thus, the harmonic represents a harmonic even after moving. This significantly reduces the artifacts.
Es wird der erste Frequenzkanal vollständig in den zweiten Frequenzkanal verschoben. Damit lässt sich beispielsweise ein Frequenzkanal aus einer toten Region in einen hörbaren Bereich eines Hörgeräteträgers verschieben. Liegt in dem ersten Frequenzkanal eine Harmonische, so wird sie vollständig mit dem Frequenzkanal verschoben. Ihr Abstand zur Mittenfrequenz des Kanals bleibt dabei zunächst unverändert.The first frequency channel is completely shifted into the second frequency channel. This allows, for example, a frequency channel from a dead region in an audible range of a hearing aid wearer move. If there is a harmonic in the first frequency channel, then it is completely shifted with the frequency channel. Their distance from the center frequency of the channel remains unchanged.
Eine der mit dem Frequenzkanal verschobenen Harmonischen zugeordnete zweite Frequenz wird geschätzt, und die verschobene Harmonische wird dann in dem zweiten Frequenzkanäl weiter auf die erste Frequenz verschoben. Dies bedeutet, dass das Verschieben in zwei Schritten erfolgt. Zunächst wird der gesamte Frequenzkanal verschoben und anschließend wird innerhalb des Frequenzkanals die ursprüngliche Harmonische wieder auf eine harmonische Frequenzposition geschoben.One of the harmonics associated with the frequency channel is estimated, and the shifted harmonic is then shifted further to the first frequency in the second frequency channel. This means that the move takes place in two steps. First, the entire frequency channel is shifted and then within the frequency channel, the original harmonic is pushed back to a harmonic frequency position.
Das Weiterverschieben auf die erste Frequenz in dem zweiten Schiebeschritt erfolgt durch Amplitudenmodulation. Dies lässt sich im Zeitbereich durch eine einfache Multiplikation mit einem Faktor exp(j·ω·t) realisieren.The further shift to the first frequency in the second shift step takes place by amplitude modulation. This can be realized in the time domain by a simple multiplication by a factor exp (j · ω · t).
Vorzugsweise stellt die Harmonische in dem ersten Frequenzkanal eine dominante Frequenz dar. Damit lässt sich ihre Position vor und nach dem Verschieben verhältnismäßig genau schätzen.Preferably, the harmonic in the first frequency channel represents a dominant frequency. This can be their position estimate relatively accurately before and after moving.
Die vorliegende Erfindung wird anhand der beigefügten Zeichnungen näher erläutert, in denen zeigen:
- FIG 1
- den prinzipiellen Aufbau eines Hörgeräts gemäß dem Stand der Technik;
- FIG 2
- das Prinzip der Frequenzkompression durch einfaches Kopieren von Kanälen gemäß dem Stand der Technik;
- FIG 3
- eine Kompression gemäß dem Stand der Technik;
- FIG 4
- eine Kompression gemäß der vorliegenden Erfindung; und
- FIG 5
- einen Ausschnitt eines unkomprimierten Spektrums und einen Ausschnitt eines komprimierten Spektrums.
- FIG. 1
- the basic structure of a hearing aid according to the prior art;
- FIG. 2
- the principle of frequency compression by simply copying channels according to the prior art;
- FIG. 3
- a compression according to the prior art;
- FIG. 4
- a compression according to the present invention; and
- FIG. 5
- a section of an uncompressed spectrum and a section of a compressed spectrum.
Zum besseren Verständnis der Erfindung wird jedoch zunächst anhand von
Eine deutliche Verbesserung insbesondere für Sprachsignale ist erreichbar, wenn zusätzlich zu der einfachen Abbildungsvorschrift gemäß dem Stand der Technik eine harmonische Korrektur durchgeführt wird, was anhand von
In
Zu dem Zweck der Frequenzkompression mit harmonischer Korrektur wird zunächst die Frequenzstruktur des harmonischen Rasters des unkomprimierten Signals geschätzt d.h. es werden die Positionen der Harmonischen im Frequenzbereich ermittelt. Anhand von
Die Modulation kann beispielsweise auf der Basis des analytischen Signals durch Multiplikation mit einem geeigneten komplexen Drehfaktor erreicht werden. So entspricht die Verschiebung um eine Kreisfrequenz ω1 einer Multiplikation mit dem Faktor exp(j·ω1·t). Die resultierende Modulation entspricht einer Amplitudenmodulation.The modulation can be achieved for example on the basis of the analytical signal by multiplication with a suitable complex rotational factor. Thus, the shift by an angular frequency ω1 corresponds to a multiplication by the factor exp (j · ω1 · t). The resulting modulation corresponds to an amplitude modulation.
Vorteilhaft lässt sich dieses Verfahren bei einer Polyphasen-Filterbank einsetzen, die nur das komplex-wertige, analytische Signal (nur positiver Frequenzanteil einer FourierTransformation) in den Kanälen erzeugt. Hierbei lässt sich mittels Modulation mit dem Modulationsterm exp(j·ω1·t) jeder Kanal zyklisch modulieren, sodass die Frequenzanteile darin entsprechend zyklisch um die Kreisfrequenz ω1 verschoben werden.Advantageously, this method can be used in a polyphase filter bank that generates only the complex-valued, analytical signal (only positive frequency component of a Fourier transformation) in the channels. In this case, by modulating with the modulation term exp (j * ω1 * t), each channel can be cyclically modulated so that the frequency components in it are correspondingly cyclically shifted by the angular frequency ω1.
Grundsätzlich sind bei der Schätzung der (dominanten) Frequenz zwei Fälle zu unterscheiden:
- 1) Es existiert eine dominante Frequenz, die gut geschätzt werden kann, d. h. es existiert ein starker tonaler Anteil in diesem Kanal. Damit kann eine gute Korrektur des harmonischen Rasters erreicht werden.
- 2) Es existiert keine dominante Frequenz, d. h. das Signal in dem Kanal ist rauschartig. Die Frequenzschätzung führt zu einer mehr oder weniger zufälligen Momentanfrequenz. Dies wiederum führt bei der Abbildung auf eine Zielfrequenz zu einer Phasenrandomisierung bzw. zufälligen Modulation in dem Kanal, was bei rauschartigen Kanälen kaum Einfluss auf den Höreindruck bewirkt.
- 1) There is a dominant frequency that can be well estimated, ie there is a strong tonal component in this channel. Thus, a good correction of the harmonic grid can be achieved.
- 2) There is no dominant frequency, ie the signal in the channel is noisy. The frequency estimate leads to a more or less random instantaneous frequency. This in turn results in the mapping to a target frequency to a phase randomization or random modulation in the channel, which causes little impact on the auditory impression in noise-like channels.
Das oben geschilderte Ausführungsbeispiel basiert darauf, dass die Harmonische 30 als Signalanteil des Audiosignals tatsächlich verschoben wird. Gemäß eines Beispiels, das nicht Teil der Erfindung ist, werden die komprimierten Spektralanteile halb-synthetisch erzeugt. Die Information über die Frequenzposition der halb-synthetisch erzeugten Spektralanteile wird aus der Schätzung der unkomprimierten harmonischen Struktur gewonnen, d. h. die Frequenz 35 wird wie in dem obigen Beispiel ermittelt. Bei der Frequenz f35 wird nun jedoch ein synthetisches Signal erzeugt. Die Amplitude dieses synthetischen Signals wird so eingestellt, dass sie der Amplitude der ursprünglichen Harmonischen 30 entspricht, d. h. die zugehörige Amplitude wird aus dem Quellspektrum gewonnen. Auch hierdurch lässt sich eine Frequenzkompression erreichen, bei der das harmonische Raster erhalten bleibt.The above-described embodiment is based on actually shifting the harmonic 30 as a signal component of the audio signal. According to an example not part of the invention, the compressed spectral components are generated semi-synthetically. The information about the frequency position of the semi-synthetically generated spectral components is taken from the estimate of the uncompressed harmonic Structure obtained, ie the
Die Abbildungsvorschrift von Quellfrequenz nach Zielfrequenz für die Frequenzkompression wird in der Audiologie in bekannter Weise durchgeführt. Die harmonische Korrektur bzw. die Einhaltung der harmonischen Struktur der komprimierten Spektralkomponenten wird dann erfindungsgemäß erzielt. Damit werden die Artefakte der einfachen Abbildungsvorschrift gemäß dem Stand der Technik massiv reduziert.The mapping rule of source frequency to target frequency for frequency compression is performed in audiology in a known manner. The harmonic correction or compliance with the harmonic structure of the compressed spectral components is then achieved according to the invention. Thus, the artefacts of the simple mapping rule according to the prior art are massively reduced.
Claims (1)
- Method for compressing the frequency of an audio signal having a fundamental frequency and at least one harmonic (20, 30), by- providing the audio signal in a plurality of frequency channels (31, 32) and- shifting or mapping the harmonic (20, 30) of the audio signal from a first frequency channel (31) of the plurality of frequency channels into a second frequency channel (32) of the plurality of frequency channels,characterised by- estimating a first frequency (f35) which is likewise harmonic with respect to the fundamental frequency in the second frequency channel (32), wherein- the harmonic (20, 30) is shifted or mapped onto the estimated first frequency (f35).- wherein the first frequency channel (31) is shifted completely into the second frequency channel (32),- wherein a second frequency (f34) assigned to the shifted harmonic is estimated and the shifted harmonic (20, 30) in the second frequency channel (32) is shifted further onto the first frequency (f35), and- wherein the further shifting onto the first frequency (f35) is accomplished by means of amplitude modulation.
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DE102010041644.4A DE102010041644B4 (en) | 2010-09-29 | 2010-09-29 | Frequency compression method with harmonic correction and device |
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EP2437521B2 true EP2437521B2 (en) | 2017-09-13 |
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CN112908345B (en) * | 2019-01-29 | 2022-05-31 | 桂林理工大学南宁分校 | Voice compression and decompression method for Internet of things |
EP4391585A1 (en) * | 2022-12-19 | 2024-06-26 | Nokia Technologies Oy | Apparatus, methods, and computer programs for audio processing |
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AU2011226820B2 (en) | 2013-10-03 |
DK2437521T4 (en) | 2017-12-18 |
DE102010041644A1 (en) | 2012-03-29 |
AU2011226820A1 (en) | 2012-04-12 |
DE102010041644B4 (en) | 2019-07-11 |
US9258655B2 (en) | 2016-02-09 |
CN102436817A (en) | 2012-05-02 |
EP2437521A1 (en) | 2012-04-04 |
CN102436817B (en) | 2013-10-30 |
US20120076332A1 (en) | 2012-03-29 |
DK2437521T3 (en) | 2014-08-11 |
EP2437521B1 (en) | 2014-04-30 |
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