WO1999004505A1 - Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals - Google Patents
Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals Download PDFInfo
- Publication number
- WO1999004505A1 WO1999004505A1 PCT/EP1998/001480 EP9801480W WO9904505A1 WO 1999004505 A1 WO1999004505 A1 WO 1999004505A1 EP 9801480 W EP9801480 W EP 9801480W WO 9904505 A1 WO9904505 A1 WO 9904505A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- noisy
- spectral values
- group
- coding
- noise
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L19/028—Noise substitution, i.e. substituting non-tonal spectral components by noisy source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect
Definitions
- MPEG-2 NBC This non-backward compatible audio standard according to MPEG-2 is called MPEG-2 NBC.
- the goal of this development is to achieve broadcasting quality in accordance with ITU-R requirements at data rates of 384 kb / s or less for 5-channel audio signals where each channel has the full bandwidth.
- the MPEG-2 NBC audio coding standard was completed in April 1997.
- the MPEG-2 NBC scheme will form the core of the already planned MPEG-4 audio standard, which will have higher data rates (over 40 kb / s per channel).
- the NBC or non-backwards compatible standard combines the coding efficiency of a high-resolution filter bank, prediction techniques and redundancy-reducing Huffman coding in order to achieve audio coding with broadcast quality at very low data rates.
- Efficient audio coding methods remove both redundancies and irrelevances from audio signals. Correlations between audio samples and sample representation statistics are exploited to remove redundancies. Frequency domain and time domain masking properties of the human hearing system are used to remove imperceptible signal components (irrelevance).
- the frequency content of the audio signal is divided into subbands using a filter bank.
- the data rate reduction is achieved by quantizing the spectrum of the time signal according to psychoacoustic models, and it can include a lossless coding method.
- a continuous-time audio signal is sampled to obtain a discrete-time audio signal.
- the discrete-time audio signal is windowed by means of a window function in order to successive blocks or frames with a certain number, z. B.
- windowed time discrete samples Each block of windowed time-discrete samples of the audio signal is successively transformed into the frequency domain, for example a modified discrete cosine transform (MDCT) can be used.
- MDCT modified discrete cosine transform
- the spectral values thus obtained have not yet been quantized and must therefore be quantized.
- the main goal is to quantize the spectral data so that the quantization noise is masked or masked by the quantized signals themselves.
- a psychoacoustic model described in the MPEG-AAC standard is used, which, taking into account the special properties of human hearing, calculates masking thresholds depending on the audio signal present.
- the spectral values are now quantized in such a way that the introduced quantization noise is hidden and thus inaudible.
- the quantization does not result in any audible noise.
- a so-called non-uniform quantizer is used in the NBC standard.
- a method is used to shape the quantization noise.
- the NBC method like previous standards, uses the single amplification of groups of spectral coefficients known as scale factor bands. In order to work as efficiently as possible, it is desirable to be able to shape the quantization noise into units that are as close as possible to the frequency groups of the human auditory system. It is therefore possible to group spectral values which show the bandwidth of the frequency groups very closely. Individual scale factor bands can be amplified in 1.5 dB steps using scale factors. Noise shaping is achieved because amplified coefficients have larger amplitudes. Therefore they are in the generally show a higher signal-to-noise ratio after quantization.
- Huffman coding is used to represent n-tuples of quantized coefficients, the Huffman code being derived from one of 12 coding tables.
- the maximum absolute value of the quantized coefficients that can be represented by each Huffman coding table and the number of coefficients in each n-tuple for each coding table are fixed a priori.
- the purpose of forming the sections or sections is therefore to group areas with the same signal statistics in order to achieve the highest possible coding gain for a section by means of a single Huffman coding table, the coding gain generally being the quotient of bits before coding and bits after coding is defined.
- coding table number which is defined in the bit stream syntax used for the NBC method
- the expression “coding table number” is intended to denote the place in the bit stream syntax that is reserved for the coding table number.
- 4 bits are required. These 4 bits must be transmitted as side information for each section, ie for each group of spectral values, so that the decoder can select the corresponding correct coding table for decoding.
- Another way of distinguishing between noisy and tonal spectral components is to use a predictor for spectral values in successive blocks.
- a prediction is carried out from one spectrum to the following spectrum, ie the spectrum that is assigned to the next time block or frame. If a predicted spectral value does not differ or differs only slightly from an actually determined spectral value of the next time block or frame, it is assumed that this spectral value is a tonal spectral component.
- a tonality measure ⁇ can be derived from this, the value of which is the basis of a decision in order to distinguish tonal and noisy spectral values from one another.
- this detection method is only suitable for strictly stationary signals. It fails to detect situations in which sine signals with slightly changed frequencies are present over time. Such signals often appear in audio signals, such as. B. Vibratos, and it is obvious to a person skilled in the art that these cannot be replaced by a noisy component.
- the group of spectral values now classified as noisy is not quantized in the usual way and entropy or redundancy coded (by means of a Huffman table, for example) is transmitted to the receiver. Instead, only an identifier for displaying the noise substitution and a measure of the energy of the noisy group of spectral values are transmitted as side information. Random values (noise) with the transmitted energy are then used in the receiver for the substituted coefficients. The noisy spectral values are thus substituted by random spectral values with a corresponding energy measure.
- the object of the present invention is to extend the existing MPEG-2 AAC standard by the possibilities of noise substitution in such a way that neither the basic encoder structure nor the structure of the existing bit stream syntax is affected.
- This object is achieved by a method for signaling noise substitution when encoding an audio signal according to claim 1, by a method for encoding an audio signal according to claim 10 and by a method for decoding an audio signal according to claim 11.
- the present invention is based on the finding that, if noise substitution is carried out for a noisy band, no quantization and redundancy coding or Huffman coding of spectral values need be carried out. Instead, as already described, noise spectral values are generated in the decoder for a noisy group, the measure of which energy corresponds to the measure of the energy of the noise-substituted spectral values. In other words, no coding tables are used for noisy groups, since no redundancy coding takes place. The coding table number, ie the corresponding space in the bit stream syntax of the coded audio signal, is therefore also superfluous.
- the spectral values that are present after a frequency domain transformation of the temporal audio signal can be grouped into scale factor bands in order to achieve an optimal masking of the quantization noise.
- several scale factor bands are additionally grouped into sections.
- a section therefore usually consists of several scale factor bands. This means that noise substitution is always signaled for an entire section, ie whether the noise substitution is active or not. Due to the fact that the noisy scale factor bands are not quantized, no scale factors have to be calculated, transmitted or coded for them. This means that in addition to the coding table number, which indicates the noise substitution itself, a further position in the bit stream is free, which can be occupied otherwise.
- the same resolution is preferably used as is used for the inverse scaling of the transmitted spectral data, ie logarithmic scaling with a resolution of 1.5 dB in the AAC standard.
- Z Y x 2 ⁇ SF ), where SF is the scale factor of the respective scale factor band, and where Z represents the requantized spectral value.
- the resolution is therefore 1.5 dB.
- a further advantageous application of the signaling of the noise substitution is given for stereo audio signals.
- the human ear is able to perceive to a certain extent a correlation between the signals or channels (L and R) of a stereo channel pair, which is referred to as "channel pair" in AAC. Therefore, even in the case of noise substitution, the correlation between the two replaced or substituted noise signals of the channel pair should be similar to that of the original signal.
- Scale factor bands in the left and right channels that have the same center frequency can both be noise-substituted if noisyness is detected. If both channels are noise-substituted and no further precautions are taken, the noise spectral values randomly generated in the encoder have the same total energy as in the original audio signal, but they are completely uncorrelated due to the random generation. Under certain circumstances, this can lead to audible errors. To avoid this, it is possible to use the same randomly generated noise spectral values of a scale factor band for both channels, which corresponds to a complete correlation of the noisy scale factor bands of the left and right
- M / S mask center / side mask
- ms_used ms used
- This M / S mask is a bit vector which indicates, in bands, whether M / S stereo coding has been applied between the two channels, which is known to experts and is introduced in JD Johnston, AJ Ferreira: "Sum-Difference Stereo Transform Coding", IEEE ICASSP 1992, pp. 569-571, and also in the MPEG-AAC standard.
- the M / S mask consists of a number of bits, each bit being assigned to a scale factor band.
- the bit of the M / S mask for the noisy scale factor band of both channels can be used to indicate whether independent noise spectral values or noise vectors should be generated for the left and right channels, which would correspond to the normal case, or whether the same noise vector is to be used for both the left and right channels in the noisy scale factor band.
- the scale factors can be coded by means of a differential coding.
- differential coding For a corresponding scale factor in a subsequent scale factor band, the entire value of the scale factor does not have to be coded again, but only the difference of the same from the previous one.
- this differential coding is also used for coding the measure for the energy of the spectral components in a noisy scale factor band. This means that for a subsequent scale factor band, it is not necessary to again measure the total amount of energy but only the difference between the current and previous coded, which in turn gives rise to bit savings.
- there must always be a first output value but this can also be a fixed value that is predetermined from the outset. This method of differential coding will therefore be particularly advantageous if successive scale factor bands are noisy.
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK98916947T DK0931386T3 (da) | 1997-07-14 | 1998-03-13 | Fremgangsmåde til signalisering af en støjsubstitution ved kodning af et audiosignal |
US09/367,775 US6766293B1 (en) | 1997-07-14 | 1998-03-13 | Method for signalling a noise substitution during audio signal coding |
AU70352/98A AU716982B2 (en) | 1997-07-14 | 1998-03-13 | Method for signalling a noise substitution during audio signal coding |
CA002284220A CA2284220C (en) | 1997-07-14 | 1998-03-13 | Method for signalling a noise substitution during audio signal coding |
AT98916947T ATE194440T1 (de) | 1997-07-14 | 1998-03-13 | Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals |
JP50619399A JP3926399B2 (ja) | 1997-07-14 | 1998-03-13 | オーディオ信号コーディング中にノイズ置換を信号で知らせる方法 |
DE59800189T DE59800189D1 (de) | 1997-07-14 | 1998-03-13 | Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals |
EP98916947A EP0931386B1 (de) | 1997-07-14 | 1998-03-13 | Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals |
GR20000401452T GR3033861T3 (en) | 1997-07-14 | 2000-07-06 | Method for signalling a noise substitution during audio signal coding |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19730129A DE19730129C2 (de) | 1997-07-14 | 1997-07-14 | Verfahren zum Signalisieren einer Rauschsubstitution beim Codieren eines Audiosignals |
DE19730129.0 | 1997-07-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999004505A1 true WO1999004505A1 (de) | 1999-01-28 |
Family
ID=7835662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/001480 WO1999004505A1 (de) | 1997-07-14 | 1998-03-13 | Verfahren zum signalisieren einer rauschsubstitution beim codieren eines audiosignals |
Country Status (13)
Country | Link |
---|---|
US (1) | US6766293B1 (de) |
EP (1) | EP0931386B1 (de) |
JP (2) | JP3926399B2 (de) |
KR (1) | KR100304055B1 (de) |
AT (1) | ATE194440T1 (de) |
AU (1) | AU716982B2 (de) |
CA (1) | CA2284220C (de) |
DE (2) | DE19730129C2 (de) |
DK (1) | DK0931386T3 (de) |
ES (1) | ES2150313T3 (de) |
GR (1) | GR3033861T3 (de) |
PT (1) | PT931386E (de) |
WO (1) | WO1999004505A1 (de) |
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EP1503502A4 (de) * | 2002-05-07 | 2005-12-14 | Sony Corp | Codierungsverfahren und einrichtung und decodierungsverfahren und einrichtung |
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Also Published As
Publication number | Publication date |
---|---|
GR3033861T3 (en) | 2000-10-31 |
CA2284220C (en) | 2002-09-24 |
DE19730129A1 (de) | 1999-01-21 |
ES2150313T3 (es) | 2000-11-16 |
AU716982B2 (en) | 2000-03-16 |
PT931386E (pt) | 2000-10-31 |
JP2000515266A (ja) | 2000-11-14 |
DK0931386T3 (da) | 2000-11-20 |
CA2284220A1 (en) | 1999-01-28 |
US6766293B1 (en) | 2004-07-20 |
EP0931386A1 (de) | 1999-07-28 |
KR100304055B1 (ko) | 2001-11-03 |
KR20000070280A (ko) | 2000-11-25 |
ATE194440T1 (de) | 2000-07-15 |
AU7035298A (en) | 1999-02-10 |
EP0931386B1 (de) | 2000-07-05 |
JP3878952B2 (ja) | 2007-02-07 |
DE59800189D1 (de) | 2000-08-10 |
JP3926399B2 (ja) | 2007-06-06 |
DE19730129C2 (de) | 2002-03-07 |
JP2005049889A (ja) | 2005-02-24 |
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