EP0482699B1 - Methode und Einrichtung zur Kodierung und Dekodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften - Google Patents
Methode und Einrichtung zur Kodierung und Dekodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften Download PDFInfo
- Publication number
- EP0482699B1 EP0482699B1 EP91202675A EP91202675A EP0482699B1 EP 0482699 B1 EP0482699 B1 EP 0482699B1 EP 91202675 A EP91202675 A EP 91202675A EP 91202675 A EP91202675 A EP 91202675A EP 0482699 B1 EP0482699 B1 EP 0482699B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- term prediction
- amplitudes
- signal
- prediction analysis
- combined
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003252 repetitive effect Effects 0.000 title claims description 5
- 230000009466 transformation Effects 0.000 claims abstract description 15
- 230000007774 longterm Effects 0.000 claims description 26
- 230000001131 transforming effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 abstract 2
- 230000006870 function Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the invention relates to a method for coding a sampled analog signal having a repetitive nature, in which the sampled signal is split into consecutive segments each containing a predetermined number of samples; in which a short-term prediction analysis is performed on said segments and in which the coefficients determined in said short-term prediction analysis are transmitted and are also fed to a short-term prediction filter, in which a long-term prediction analysis performed on a residual signal available at an output of said filter and the information determined in said long-term prediction analysis is also transmitted, and in which the information present in the residual signal is coded and transmitted.
- Such a method is known from "An error protected transform coder for cellular mobile radio", by H. Suda et al, disclosed during the IEEE Workshop on speech coding "Advances in speech coding", Vancouver, CA, 5-8 September 1989, pages 81-86.
- This paper discloses in its figure 1 an encoder in which a short-term prediction analysis and a long-term prediction analysis are performed.
- This encoder comprises a short-term prediction filter for generating a residual signal and comprises a multiplexing unit for multiplexing and then transmitting (after coding) information present in the residual signal, information determined in said short-term prediction analysis and information determined in said long-term prediction analysis.
- This known method is disadvantageous, inter alia, because it transmits information in an inefficient way, i.e. with a large number of bits/second.
- the method according to the invention is characterised in that the residual signal is transformed into the frequency domain, in that the amplitudes of at least a number of the frequency components obtained by the transformation into the frequency domain are combined to form a smaller number of frequency components in a manner such that the frequencies associated with the combined amplitudes are situated equidistantly on a linear Bark scale, and in that a signal is transmitted which is representative of said combined amplitudes.
- the residual signal is coded perceptively, which means that only that information is transmitted which is relevant for differences in the decoded received signal which can be detected by the human ear.
- the present invention makes use of the insight known for some time that human hearing functions in fact as a chain consisting of a number of filters having adjacent frequency bands but having different bandwidths, the so-called critical bands or Barks, the bandwidth of such critical bands being much smaller for low frequencies than for high frequencies.
- a frequency scale formed in accordance with this insight is referred to as a linear Bark scale.
- Bark scale For a further explanation of the principle of the Bark scale, reference is made to B. Scharf and S. Buus, "Stimulus, Physiology, Thresholds" in L. Kaufman, K.R. Boff and J. P. Thomas, editors, Handbook of Perception and Human Performance, chapter 14, pages 1-43, Wiley, New York, 1986.
- the invention further relates to a method for decoding a signal coded by the method describer above, in which the long-term prediction analysis information received and the other information received from the residual signal are combined and the combined signal, together with the short-term prediction analysis coefficients received, is fed to an inverse short-term prediction filter at whose output a series of samples is delivered which is representative of the sampled analog signal.
- the method for decoding is characterised in that original amplitudes in the frequency domain are reconstructed from the combined amplitude values received, in that the information transmitted as a result of the long-term prediction analysis is used to calculate the phase values associated with said amplitudes, and in that the calculated phase values, together with the associated amplitudes are transformed to the time domain.
- the invention also relates to an apparatus for coding a sampled analog signal having a repetitive nature, comprising
- the invention further also relates to an apparatus for decoding a coded signal, comprising
- LPC linear predictive coding
- LTP long-term prediction
- Figure 1a shows a block diagram of an exemplary embodiment of a coding unit for the device according to the invention.
- Figure 1b shows a block diagram of an exemplary embodiment of a decoding unit for the device according to the invention.
- An analog signal delivered by a microphone 1 is limited in bandwidth by a low-pass filter 2 and converted in an analog/digital converter 3 into a series of amplitude and time-discrete samples which are representative of the analog signal.
- the output signal of the converter 3 is fed to the input of a short-term analysis unit 4 and to the input of a short-term prediction filter 5.
- STP short-term prediction
- the analysis unit 4 provides an output signal in the form of short-term prediction filter coefficients which are quantised, coded and transmitted to the decoder unit shown in Figure 1b.
- the structure and the function of the filter 5 and the unit 4 are well known to those skilled in the art in the field of speech coding and are of no further importance for the present invention, so that a further explanation can be omitted.
- the STP-filtered signal is fed to a long-term prediction (LTP) analysis unit 6.
- LTP long-term prediction
- an LTP analysis is applied twice per segment of 160 samples in a manner such as that described, for example, in Dutch Patent Application 9001985.
- a search is always made, in accordance with a particular search strategy, for a segment which is as similar as possible in a signal period preceding said segment having a particular duration and a signal is transmitted in coded form which is representative of the number of samples D situated between the starting instant of the segment found and the starting instant of the segment to be coded.
- the output signal of the STP filter unit 5 is referred to as the residual signal and, according to the invention, said residual signal is transmitted in coded form in a manner such that only the information which, seen perceptively, is relevant is transmitted.
- the segments of 160 samples in said residual signal are divided into 8 subsegments of 30 samples in the circuit 7. This is done by first dividing the segment supplied into eight subsegments of 20 samples and then completing these at the leading edge with the ten last samples of the previous subsegment. This implies that the last ten samples of every segment have to be stored in order to also be able to complete the first subsegment of the subsequent segment.
- Every subsegment of 30 samples is multiplied in a circuit 8 by a window function such as, for example, a cosine function.
- the window function is so chosen that, for every sample in the overlapping parts of the subsegments, the sum of the squares of the two multiplication factors is unity. The reason that this has to be the case for the squares is that the multiplication by the window function takes place both in the coding unit and in the decoding unit shown in Figure 1b.
- a Discrete Fourier Transform (DFT) is performed on the windowed subsegment in a circuit 9, 16 different frequency components being obtained for every subsegment.
- the amplitudes A of the components 1 to 13 inclusive are calculated in a circuit 10.
- the components 0, 14 and 15 can be ignored because they are situated outside the frequency band of 300 - 3,400 Hz chosen for speech communication. If a greater or a smaller frequency band is relevant, the number of amplitude components taken into consideration can be adjusted accordingly.
- Bark amplitude components are calculated in a circuit 11. These are amplitudes associated with frequencies which are situated equidistantly on a linear Bark scale.
- the application of the scaling value G has the advantage that the scaled amplitudes can be coded more efficiently.
- the value of G is quantised in a circuit 13 and then transmitted to the decoding unit. If the scale factor G has been calculated, every Bark component is divided by the quantised gain factor ⁇ in a circuit 14. The result of this division is quantised in a circuit 15, coded and then also transmitted to the decoding unit.
- circuits 12, 13 and 14 can be omitted and the four calculated values for the Bark amplitude components can be transmitted directly after quantisation in circuit 15.
- the four scaled Bark amplitude components are multiplied in a multiplier 18 by the gain factor, ⁇ , decoded in a circuit 17, as a result of which the reconstructed Bark amplitude components B ⁇ 1 to B ⁇ 4 inclusive are obtained. This is of course not applicable if no scaling factor is used in the coding unit.
- the amplitudes and the phases are required.
- the phases are determined in the following manner with the aid of the LTP information decoded in a circuit 23 and consisting of the sample spacing D.
- the 120 most recent samples of the reconstructed STP residue such as are present at the output of the circuit 22 to be discussed in greater detail below are stored in each case.
- the subsegment is determined which is situated at a spacing of D samples in the past with respect to the present subsegment and this subsegment is multiplied in a circuit 25 by the same window function as was used in the circuit 8 in the coder unit.
- a DFT is then applied to said subsegment in a circuit 26, after which the phases of the 13 components considered can be calculated in a circuit 27. With the aid of the phases determined in this way and the amplitudes already calculated, an IDFT is performed in the circuit 20, the amplitudes of ⁇ 0 , ⁇ 14 , ⁇ 15 and ⁇ 16 being set equal to zero.
- the last ten samples in this subsegment are stored.
- the first twenty samples form a portion of the reconstruction of a segment of the STP residue.
- a completely reconstructed segment of the STP residue is obtained, and this is situated ten samples in the past with respect to the segment on which the STP analysis has been performed in the coding unit.
- An inverse STP filtering is performed on this segment in a filter circuit 28 in a manner known per se with the aid of the STP coefficients received, the filter coefficients from the previous segment being used for the first ten samples.
- the output signal of the filter 28 is converted in a digital/analog converter 29 into an analog signal which is fed via a low-pass filter 30 to a loudspeaker 31 which gives a high-fidelity reproduction of the speech signal supplied to the microphone 1, it having been possible to transmit said speech signal in coded form with a low number of bits due to the measures according to the invention.
- a circuit 23' can be included between the circuits 23 and 24 to first subject the value of D received by the decoder additionally to a number of operations in order to obtain an optimum value of D for the reconstruction of the speech signal. These may be three consecutive operations.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Analogue/Digital Conversion (AREA)
- Electrically Operated Instructional Devices (AREA)
Claims (10)
- Verfahren zur Kodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften, bei dem das abgetastete Signal in aufeinanderfolgende Segmente aufgespalten wird, die jeweils eine vorbestimmte Anzahl von Abtastproben enthalten, bei dem weiterhin eine Kurzzeitvorhersageanalyse auf den besagten Segmenten durchgeführt wird und bei dem die in der besagten Kurzzeitvorhersageanalyse bestimmten Koeffizienten übertragen und einem Kurzzeitvorhersagefilter zugeführt werden, in dem eine Langzeitvorhersageanalyse auf einem Residuumsignal durchgeführt wird, welches am Ausgang des besagten Filters vorliegt, und wobei die in der besagten Langzeitvorhersageanalyse bestimmte Information auch übertragen wird und bei dem die in dem Residuumsignal vorliegende Information kodiert und dann übertragen wird, dadurch gekennzeichnet, dass das Residuumsignal in den Frequenzbereich transformiert wird, dass die Amplituden von mindestens einer Anzahl der Frequenzkomponenten, die aus der Transformation in den Frequenzbereich erhalten werden, kombiniert werden, um eine geringere Anzahl von Frequenzkomponenten in einer solchen Weise zu erhalten, dass die zugehörigen Frequenzen mit den kombinierten Amplituden in äquidistanter Weise auf einer linearen Bark-Skala angeordnet sind, und dass ein Signal übertragen wird, welches für die besagten kombinierten Amplituden repräsentativ ist.
- Verfahren zur Dekodierung eines mit dem Verfahren nach Anspruch 1 kodierten Signals, bei dem die Langzeitvorhersageanalyse-Information, die empfangen wurde, und die anderen von dem Residuumsignal empfangenen Informationen kombiniert werden und das kombinierte Signal, zusammen mit den Kurzzeitvorhersageanalyse-Koeffizienten einem inversen Kurzzeitvorhersagefilter zugeführt werden, an dessen Ausgang eine Serie von Abtastproben anliegen, die für das abgetastete analoge Signal repräsentativ sind, dadurch gekennzeichnet, dass die originalen Amplituden im Frequenzbereich von den empfangenen Amplitudenwerten rekonstruiert werden, die nach Anspruch 1 kombiniert werden, dass die als Ergebnis der Langzeitvorhersageanalyse übertragene Information eingesetzt wird, um die mit den besagten Amplituden zugehörigen Phasenwerte zu berechnen und dass die berechneten Phasenwerte zusammen mit den zugehörigen Amplituden in den Zeitbereich transformiert werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Amplituden von dreizehn Frequenzkomponenten A1 bis einschliesslich A13, die aus der Transformation in den Frequenzbereich erhalten worden sind, in Amplituden B1 bis einschliesslich B4 von vier Frequenzkomponenten transformiert werden, die in Übereinstimmung mit
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass ein Skalierwert G für die vier Frequenzkomponenten B1 bis einschliesslich B4, die äquidistant auf einer Bark-Skala angeordnet sind, berechnet wird:
- Verfahren nach Anspruch 2 und 3 oder 4, dadurch gekennzeichnet, dass die kombinierten Amplitudenwerte B̂ 1 bis B̂ 4 aus der empfangenen Information rekonstruiert werden, dass die Amplitudenwerte  1 bis einschliesslich  13 in Übereinstimmung mit folgenden Formeln berechnet werden:
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Gruppe von Abtastproben, die vorher übertragen worden ist und die in einem Abstand D in Bezug auf die Gruppe von zu dekodierenden Abtastproben angeordnet ist, in den Frequenzbereich transformiert wird, dass der Phasenwert von mindestens einer Anzahl von Frequenzkomponenten bestimmt wird, die mit dieser Transformation berechnet worden sind, dass die Phasenwerte mit den Amplitudenwerten  1 bis einschliesslich  13 kombiniert werden und dass diese Kombinationen zurück in den Zeitbereich transformiert werden.
- Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Veränderung in den empfangenen Werten von D geglättet wird gemäss einem vorbestimmten Algorithmus, indem, falls notwendig, ein Ersatzwert für einen empfangenen Wert von D berechnet wird, und dass drei Zwischenwerte für D zwischen zwei aufeinanderfolgende Werte von D durch das Mittel der Interpolation berechnet werden.
- Vorrichtung zur Kodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften mit- Aufteilungsmitteln zum Aufteilen des abgetasteten Signals in aufeinanderfolgende Segmente mit jeweils einer vorbestimmten Anzahl von Abtastproben,- Mitteln zur Kurzzeitvorhersage zur Durchführung einer Kurzzeitvorhersageanalyse mit den besagten Segmenten und zur Erzeugung von Koeffizienten,- einem Kurzzeitvorhersagefilter zum Empfang der in der besagten Kurzzeitvorhersageanalyse bestimmten Koeffizienten,- Mitteln zur Langzeitvorhersage zur Durchführung einer Langzeitvorhersageanalyse auf einem Residuumsignal, welches an einem Ausgang des besagten Filters anliegt,- Kodiermitteln zum Kodieren der in dem Residuumsignal vorhandenen Information, wobei diese Information zu übertragen ist, und- einem Ausgang zur Übertragung der Koeffizienten der in der besagten Langzeitvorhersageanalyse bestimmten Information und der in dem Residuumsignal vorliegenden Information,dadurch gekennzeichnet, dass die Vorrichtung weiterhin umfasst- Transformationsmittel zur Transformation des Residuumsignals in den Frequenzbereich,- Kombinationsmittel zum Kombinieren der Amplituden von mindestens einer Anzahl von Frequenzkomponenten, die durch die Transformation in den Frequenzbereich erhalten worden sind, um eine kleinere Anzahl von Frequenzkomponenten in einer solchen Weise zu erhalten, dass die zugehörigen Frequenzen mit den kombinierten Amplituden in äquidistanter Weise auf einer linearen Bark-Skala angeordnet sind, wobei das Signal, welches für die besagten kombinierten Amplituden repräsentativ ist, übertragbar ist.
- Vorrichtung zur Dekodierung eines mit dem Verfahren nach Anspruch 1 kodierten Signals, mit- einem Eingang zum Empfang einer Langzeitvorhersageanalyse-Information und anderer von dem Residuumsignal empfangener Information und der Kurzzeitvorhersageanalyse-Koeffizienten,- Kombinationsmitteln zum Kombinieren der Langzeitvorhersageanalyse-Information und der von dem Residuumsignal empfangenen anderen Information in ein kombiniertes Signal,- einem inversen Kurzzeitvorhersagefilter zum Empfang des kombinierten Signals und der Kurzzeitvorhersageanalyse-Koeffizienten und zur Erzeugung an seinem Ausgang einer Abfolge von Abtastproben, die für das abgetastete analoge Signal repräsentativ sind,dadurch gekennzeichnet, dass die Vorrichtung weiterhin umfasst- Rekonstruktionsmittel zur Rekonstruktion der originalen Amplituden im Frequenzbereich aus den empfangenen Amplitudenwerten, die gemäss Anspruch 1 kombiniert werden,- Rechenmittel zur Benutzung der übertragenen Information als Ergebnis der Langzeitvorhersageanalyse, um die mit den besagten Amplituden zugehörigen Phasenwerte zu berechnen, und- Transformationsmittel zur Transformation der berechneten Phasenwerte zusammen mit den zugehörigen Amplituden in den Zeitbereich.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9002308A NL9002308A (nl) | 1990-10-23 | 1990-10-23 | Werkwijze voor het coderen en decoderen van een bemonsterd analoog signaal met een herhalend karakter en een inrichting voor het volgens deze werkwijze coderen en decoderen. |
NL9002308 | 1990-10-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0482699A2 EP0482699A2 (de) | 1992-04-29 |
EP0482699A3 EP0482699A3 (en) | 1992-08-19 |
EP0482699B1 true EP0482699B1 (de) | 1997-08-20 |
Family
ID=19857866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91202675A Expired - Lifetime EP0482699B1 (de) | 1990-10-23 | 1991-10-16 | Methode und Einrichtung zur Kodierung und Dekodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0482699B1 (de) |
JP (1) | JP2958726B2 (de) |
AT (1) | ATE157188T1 (de) |
CA (1) | CA2053133C (de) |
DE (1) | DE69127339T2 (de) |
DK (1) | DK0482699T3 (de) |
ES (1) | ES2106051T3 (de) |
FI (1) | FI105623B (de) |
NL (1) | NL9002308A (de) |
NO (1) | NO305188B1 (de) |
PT (1) | PT99294A (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07261797A (ja) * | 1994-03-18 | 1995-10-13 | Mitsubishi Electric Corp | 信号符号化装置及び信号復号化装置 |
JPH09127995A (ja) * | 1995-10-26 | 1997-05-16 | Sony Corp | 信号復号化方法及び信号復号化装置 |
JP2000165251A (ja) * | 1998-11-27 | 2000-06-16 | Matsushita Electric Ind Co Ltd | オーディオ信号符号化装置及びそれを実現したマイクロホン |
FI116992B (fi) | 1999-07-05 | 2006-04-28 | Nokia Corp | Menetelmät, järjestelmä ja laitteet audiosignaalin koodauksen ja siirron tehostamiseksi |
EP1113432B1 (de) * | 1999-12-24 | 2011-03-30 | International Business Machines Corporation | Verfahren und System zur Erkennung von identischen digitalen Daten |
CN114519996B (zh) * | 2022-04-20 | 2022-07-08 | 北京远鉴信息技术有限公司 | 一种语音合成类型的确定方法、装置、设备以及存储介质 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5650398A (en) * | 1979-10-01 | 1981-05-07 | Hitachi Ltd | Sound synthesizer |
US4742550A (en) * | 1984-09-17 | 1988-05-03 | Motorola, Inc. | 4800 BPS interoperable relp system |
JP2892462B2 (ja) * | 1990-08-27 | 1999-05-17 | 沖電気工業株式会社 | コード励振線形予測符号化器 |
-
1990
- 1990-10-23 NL NL9002308A patent/NL9002308A/nl not_active Application Discontinuation
-
1991
- 1991-10-10 CA CA002053133A patent/CA2053133C/en not_active Expired - Lifetime
- 1991-10-16 ES ES91202675T patent/ES2106051T3/es not_active Expired - Lifetime
- 1991-10-16 EP EP91202675A patent/EP0482699B1/de not_active Expired - Lifetime
- 1991-10-16 DK DK91202675.4T patent/DK0482699T3/da active
- 1991-10-16 DE DE69127339T patent/DE69127339T2/de not_active Expired - Lifetime
- 1991-10-16 AT AT91202675T patent/ATE157188T1/de not_active IP Right Cessation
- 1991-10-17 JP JP3332967A patent/JP2958726B2/ja not_active Expired - Lifetime
- 1991-10-18 NO NO914105A patent/NO305188B1/no not_active IP Right Cessation
- 1991-10-22 PT PT99294A patent/PT99294A/pt not_active Application Discontinuation
- 1991-10-23 FI FI914993A patent/FI105623B/fi not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JPH05268098A (ja) | 1993-10-15 |
NO914105D0 (no) | 1991-10-18 |
NL9002308A (nl) | 1992-05-18 |
JP2958726B2 (ja) | 1999-10-06 |
FI914993A0 (fi) | 1991-10-23 |
DE69127339D1 (de) | 1997-09-25 |
ES2106051T3 (es) | 1997-11-01 |
CA2053133C (en) | 1996-05-21 |
FI105623B (fi) | 2000-09-15 |
EP0482699A3 (en) | 1992-08-19 |
DK0482699T3 (da) | 1998-03-30 |
NO914105L (no) | 1992-04-24 |
NO305188B1 (no) | 1999-04-12 |
CA2053133A1 (en) | 1992-04-24 |
PT99294A (pt) | 1994-01-31 |
ATE157188T1 (de) | 1997-09-15 |
DE69127339T2 (de) | 1998-01-29 |
FI914993A (fi) | 1992-04-24 |
EP0482699A2 (de) | 1992-04-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69524512T2 (de) | Verfahren zur Aufnahme und Wiedergabe digitaler Audiosignale und Apparat dafür | |
KR970007661B1 (ko) | 스테레오포닉 오디오 신호의 입력세트 코딩방법 | |
KR100361236B1 (ko) | 차분코딩원리를구현하는전송시스템 | |
US6681204B2 (en) | Apparatus and method for encoding a signal as well as apparatus and method for decoding a signal | |
KR101646650B1 (ko) | 최적의 저-스루풋 파라메트릭 코딩/디코딩 | |
JPS6161305B2 (de) | ||
CN101010725A (zh) | 多信道信号编码装置以及多信道信号解码装置 | |
KR100352351B1 (ko) | 정보부호화방법및장치와정보복호화방법및장치 | |
EP0482699B1 (de) | Methode und Einrichtung zur Kodierung und Dekodierung eines abgetasteten Analogsignals mit Wiederholungseigenschaften | |
US5687281A (en) | Bark amplitude component coder for a sampled analog signal and decoder for the coded signal | |
KR100303580B1 (ko) | 송신기,엔코딩장치및송신방법 | |
US5588089A (en) | Bark amplitude component coder for a sampled analog signal and decoder for the coded signal | |
US5899966A (en) | Speech decoding method and apparatus to control the reproduction speed by changing the number of transform coefficients | |
EP2261894A1 (de) | Signalanalyse-/steuerungssystem und -verfahren, signalsteuerungsvorrichtung und -verfahren sowie programm dafür | |
JP2523286B2 (ja) | 音声符号化及び復号化方法 | |
KR100727276B1 (ko) | 개선된 인코더 및 디코더를 갖는 전송 시스템 | |
JPH0519798A (ja) | 信号処理装置 | |
JP3827720B2 (ja) | 差分コーディング原理を用いる送信システム | |
EP0475520B1 (de) | Verfahren und Einrichtung zur Kodierung eines Analogsignals mit Wiederholeigenschaft | |
EP0573103A1 (de) | Sender, Empfänger und Aufzeichnungsträger in einem digitalen Ubertragungssystem | |
KR100205472B1 (ko) | 양자화 시스템 | |
JP3099569B2 (ja) | 音響信号の伝送方法 | |
JPH07273656A (ja) | 信号処理方法及び装置 | |
KR960003627B1 (ko) | 서브 밴드 부호화된 오디오 신호의 난청자용 복호화 방법 | |
JPH0784595A (ja) | 音声・楽音の帯域分割符号化装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19930210 |
|
17Q | First examination report despatched |
Effective date: 19950913 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19970820 |
|
REF | Corresponds to: |
Ref document number: 157188 Country of ref document: AT Date of ref document: 19970915 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: CH Ref legal event code: NV Representative=s name: ISLER & PEDRAZZINI AG |
|
REF | Corresponds to: |
Ref document number: 69127339 Country of ref document: DE Date of ref document: 19970925 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO MASSARI S.R.L. |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19971031 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2106051 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Free format text: KONINKLIJKE PTT NEDERLAND N.V. TRANSFER- KONINKLIJKE KPN N.V. |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PCAR Free format text: ISLER & PEDRAZZINI AG;POSTFACH 1772;8027 ZUERICH (CH) |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20101013 Year of fee payment: 20 Ref country code: AT Payment date: 20101014 Year of fee payment: 20 Ref country code: DK Payment date: 20101015 Year of fee payment: 20 Ref country code: FR Payment date: 20101104 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20101025 Year of fee payment: 20 Ref country code: DE Payment date: 20101022 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20101021 Year of fee payment: 20 Ref country code: BE Payment date: 20101013 Year of fee payment: 20 Ref country code: SE Payment date: 20101014 Year of fee payment: 20 Ref country code: IT Payment date: 20101026 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20101025 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69127339 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69127339 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: V4 Effective date: 20111016 |
|
BE20 | Be: patent expired |
Owner name: KONINKLIJKE *PTT NEDERLAND N.V. Effective date: 20111016 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL Ref country code: DK Ref legal event code: EUP |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20111015 |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK07 Ref document number: 157188 Country of ref document: AT Kind code of ref document: T Effective date: 20111016 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20111016 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20111015 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20120604 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20111017 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20111017 |