EP1854334B1 - Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio - Google Patents

Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio Download PDF

Info

Publication number
EP1854334B1
EP1854334B1 EP06707184A EP06707184A EP1854334B1 EP 1854334 B1 EP1854334 B1 EP 1854334B1 EP 06707184 A EP06707184 A EP 06707184A EP 06707184 A EP06707184 A EP 06707184A EP 1854334 B1 EP1854334 B1 EP 1854334B1
Authority
EP
European Patent Office
Prior art keywords
channel
stereo
uncoded
channels
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.)
Active
Application number
EP06707184A
Other languages
German (de)
English (en)
Other versions
EP1854334A1 (fr
Inventor
Jan Plogsties
Harald Mundt
Harald Popp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to PL06707184T priority Critical patent/PL1854334T3/pl
Priority to EP09006142.5A priority patent/EP2094031A3/fr
Publication of EP1854334A1 publication Critical patent/EP1854334A1/fr
Application granted granted Critical
Publication of EP1854334B1 publication Critical patent/EP1854334B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H04S3/004—For headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/03—Application of parametric coding in stereophonic audio systems

Definitions

  • the present invention relates to multi-channel audio technology, and more particularly to multi-channel audio applications in conjunction with headphone techniques.
  • the two international patent applications WO 99/49574 and WO 99/14983 disclose audio signal processing techniques for driving a pair of oppositely located headphone speakers to provide a user with spatial perception of the audio scene through the two headphones, which is not just a stereo representation but a multi-channel presentation.
  • the listener receives via his or her headphones a spatial perception of an audio piece that is equal to its spatial perception at best, if the user would sit in a playback room, which is equipped for example with a 5.1 audio system.
  • each channel of the multi-channel audio track or multi-channel audio stream, as shown in Fig. 2 is shown, fed to its own filter, after which then the respective filtered belonging together channels are added, as shown below.
  • Fig. 10 shows a playback room 200 in which a so-called 5.1 audio system is arranged.
  • the 5.1 audio system includes a center speaker 201, a front-left speaker 202, a front-right speaker 203, a rear-left speaker 204, and a rear-right speaker 205.
  • a 5.1 audio system has an additional subwoofer 206, which is also referred to as a low-frequency enhancement channel.
  • a listener 207 wearing a headset 208 having a left headphone speaker 209 and a right headphone speaker 210.
  • Fig. 2 Processing means shown is now adapted to each channel 1, 2, 3 of the multi-channel inputs 20 with a filter H iL , the sound channel from the speaker to the left speaker 209 in Fig. 10 describes to filter and to further filter the same channel with a filter H iR representing the sound from one of the five speakers to the right ear 210 to the right speaker 210 of the headphone 208.
  • the filter H iL would represent the channel indicated by a dashed line 212
  • the filter H 1R would represent the channel represented by a dashed line 213.
  • the left earphone speaker 209 receives not only the direct sound, but also early reflections at an edge of the playback room and, of course, late reflections that are expressed in a diffuse reverberation.
  • FIG. 11 Such a filter representation is in Fig. 11 shown.
  • Fig. 11 a schematic example of an impulse response of a filter, for example, the filter H 1L of Fig. 2
  • the direct sound coming through line 212 in FIG Fig. 11 is represented by a peak at the beginning of the filter, whereas early reflections, such as those shown by 214 in FIG Fig. 10 are represented by a central region with a plurality of (discrete) smaller peaks in Fig. 11 be reproduced.
  • the diffuse reverberation is then typically not more resolved to individual peaks, since the sound of the speaker 202 is reflected in principle as often as desired, the energy of course, with each reflection and additional propagation distance continues to decrease, as by the decreasing energy in the rear section, with "diffuse reverberation" in Fig. 11 is indicated, is shown.
  • the filter shown comprises a filter impulse response, which has approximately a course, as shown by the schematic impulse response representation in Fig. 11 is reproduced.
  • each channel is filtered with a corresponding filter for the left ear to then simply add up the signals output from the filters, which are all for the left ear, to obtain the headphone output signal for the left ear L.
  • addition is made by the right ear adder 23 and the right headphone speaker 210 in FIG Fig. 10 in order to obtain the headphone output signal for the right ear by superimposing all the loudspeaker signals filtered with a corresponding filter for the right ear.
  • Headphone systems for generating a multi-channel headphone sounds are therefore complicated, bulky and expensive, due to the high computing power, the high power requirements for the necessary high computing power and high memory requirements for the ratings to be performed with the impulse response and the associated large volume or expensive blocks for the player is.
  • Such applications are therefore tied to home PC sound cards or laptop sound cards or home stereo systems.
  • the ever-expanding market for mobile players remains the multi-channel headphone sound closed because the computational requirements for filtering the multi-channels with z.
  • B. 12 different filters both in terms of processor resources as well as in terms of power consumption of the typically battery-powered devices are not feasible in the price segment. This is about a price segment at the lower (low) end of the scale. Especially this price segment is economically very interesting because of the large quantities.
  • the post-published EP 1 768 451 A1 discloses an apparatus for coding an acoustic signal and an apparatus for decoding an acoustic signal.
  • a coefficient table holds coefficients in the form of a matrix of two rows and n columns, the coefficients simulating head-related transfer characteristics to be used when a signal is to be reproduced.
  • a first signal output unit an N-channel frequency domain signal is converted into a two-channel downmix signal according to the coefficient table.
  • a second signal output unit exists for generating auxiliary information to be used to reconstruct only the channel signals based on a two-channel downmix signal, thereby allowing the downmix signal to be filtered according to a desired transfer function.
  • a decoder reproduces the original multi-channel signal by reproducing the original multi-channel signal space information, which is then used to reconstruct the multi-channel signal.
  • the object of the present invention is to provide an efficient signal processing concept that enables multi-channel headphone reproduction even on simple playback devices.
  • This object is achieved by a device for generating a coded stereo signal according to claim 1 or by a method for generating a coded stereo signal according to claim 10 or a computer program according to claim 11.
  • the present invention is based on the finding that the high-quality and attractive multi-channel headphone sound can be made available to all available playback devices, such as CD players or hardware players, by providing a multi-channel display of an audio track or audio data stream So, for example, a 5.1 representation of an audio piece outside of a hardware player, so z. B. in a high-power computer of a provider of a headphone signal processing.
  • the result of earphone signal processing is not simply played back but fed to a typical audio stereo coder, which then generates a coded stereo signal from the left earphone channel and the right earphone channel.
  • This coded stereo signal can then, like any other coded stereo signal, which has no multi-channel representation, the hardware player or z.
  • the result of the headphone signal processing ie the left and the right headphone signal is not reproduced in a headphone, as in the prior art, but coded and output as coded stereo data.
  • Such an output may be a store, a transfer, or anything like that.
  • Such a file with coded stereo data can then be readily supplied to any player designed for stereo playback without the user having to make any changes to his device.
  • the concept according to the invention of generating a coded stereo signal from the result of the headphone signal processing thus makes it possible for the multichannel presentation, which provides a much better and more lifelike quality for a user, to also be simple and very widely used in the future even more widespread hardware players can be used.
  • a coded multi-channel representation that is, a parameter representation having one or typically two base channels, and further comprising parameter data to on the basis of the base channels and the parameter data to the multi-channels of the multi-channel representation produce.
  • the headphone signal processing according to the invention is performed not in the time domain by convolution of the time signal with the impulse response, but in the frequency domain by multiplication with the filter transfer function.
  • the present invention is used as a multi-channel representation of a BCC representation with one or preferably two base channels.
  • the BCC method works in the frequency domain, the multi-channels are not transformed into the time domain after their synthesis, as is usual with the BCC decoder. Instead, the spectral representation of the multichannels is used in blocks and subjected to the headphone signal processing.
  • the transfer functions of the filters are used, that is, the Fourier transforms the impulse responses to perform a multiplication between the spectral representation of the multi-channels and the filter transfer functions.
  • a block-wise filter processing is preferred in which the impulse responses of the filters in the time domain be separated and be transformed block by block to then perform necessary for such measures weights of the spectra, as described for example in the WO 94/01933 are disclosed.
  • Fig. 1 shows a schematic block diagram of an inventive device for generating a coded stereo signal of an audio track or audio data stream.
  • the stereo signal comprises in uncoded form an uncoded first stereo channel 10a and an uncoded second stereo channel 10b, and is generated from a multi-channel representation of the audio piece or audio data stream, the multi-channel representation comprising information on more than two multi-channels.
  • the multi-channel representation may be in uncoded or encoded form. If the multi-channel representation is present in uncoded form, it includes three or more multi-channels. In a preferred application scenario, the multichannel presentation includes five channels and a subwoofer channel.
  • this encoded form typically includes one or more base channels and parameters for synthesizing the three or more multi-channels from the one or both base channels.
  • a multi-channel decoder 11 is therefore one example of a means for providing the more than two multi-channels from the multi-channel representation.
  • the multichannel presentation already in uncoded form ie z. B. in the form of 5 + 1 PCM channels, the means for providing an input terminal for a device 12 for Performing headphone signal processing to produce the uncoded stereo signal with the uncoded first stereo channel 10a and the uncoded second stereo channel 10b.
  • the headphone signal processing means 12 is arranged to evaluate the multi-channels of the multi-channel display respectively with a first filter function for the first stereo channel and a second filter function for the second stereo channel and weighted multi-channels in each case to obtain the uncoded first stereo channel and the uncoded second stereo channel, as determined by Fig. 2 has been shown.
  • the device 12 for performing the headphone signal processing is followed by a stereo encoder 13, which is configured to encode the first uncoded stereo channel 10a and the second uncoded stereo channel 10b to the encoded stereo signal at an output 14th of the stereo encoder 13.
  • the stereo encoder performs data rate reduction so that a data rate necessary to transmit the encoded stereo signal is less than a data rate necessary to transmit the uncoded stereo signal.
  • inventive concept allows the computationally expensive steps to multi-channel decode and perform headphone signal processing not be performed in the player itself, but are performed externally.
  • the result of the inventive concept is a coded stereo file, which is for example an MP3 file, an AAC file, a HE AAC file or any other stereo file.
  • the multi-channel decoding, the headphone signal processing and the stereo encoding can be performed on different devices, since the output data or input data of the individual blocks are easily portable and standardized generated and stored.
  • Fig. 7 a preferred embodiment of the present invention is shown, in which the multi-channel decoder 11 has a filter bank or an FFT function, such that the multi-channel representation is provided in the frequency domain.
  • the individual multi-channels are generated separately as blocks of spectral values for each channel.
  • the headphone signal processing is then not performed in the time domain by folding the temporal channels with the filter impulse responses, but it is performed a multiplication of the frequency domain representation of the multi-channels with a spectral representation of the filter impulse response.
  • an uncoded stereo signal is reached, which is not present in the time domain, but comprising a left and a right stereo channel, wherein such a stereo channel is given as a result of blocks of spectral values, each block of spectral values represents a short-term spectrum of the stereo channel.
  • the headphone signal processing block 12 is supplied on the input side either with time domain or frequency domain data.
  • the uncoded stereo channels in the frequency domain ie again generated as a sequence of blocks of spectral values.
  • a stereo coder which is transformation-based, that processes spectral values, without a frequency / time conversion and a subsequent time between the headphone signal processor 12 and the stereo coder 13 is preferred as the stereo coder 13 Frequency conversion is required.
  • the stereo encoder 13 On the output side, the stereo encoder 13 then outputs a file with the coded stereo signal, which in addition to page information comprises a coded form of spectral values.
  • a continuous frequency domain processing performed without a conversion into the time domain and, if appropriate, again has to be implemented in the frequency domain. If an MP3 coder or an AAC coder is used as the stereo coder, it is preferable to convert the Fourier spectrum at the output of the headphone signal processing block into an MDCT spectrum.
  • phase information which is required exactly for the convolution / evaluation of the channels in the headphone signal processing block is converted into the MDCT representation which does not operate in phase-correct manner, so that for the stereo encoder, in contrast to a normal MP3 encoder or a normal AAC encoder no means for converting time domain in the frequency domain, ie in the MDCT spectrum is needed.
  • Fig. 9 shows a general block diagram for a preferred stereo encoder.
  • the stereo encoder comprises on the input side a joint stereo module 15, which preferably adaptively determines whether a common stereo coding, for example in the form of a middle / side encoding, provides a higher coding gain than a separate processing from left and right channel.
  • the joint stereo module 15 may further be configured to perform intensity stereo coding, wherein intensity stereo coding provides a significant coding gain, especially at higher frequencies, without audible artifacts occurring.
  • the output of the joint stereo module 15 is then further processed using various other redundancy-reducing measures, such as TNS filtering, noise substitution, etc., and then applying the results to a quantizer 16 which quantizes using a psychoacoustic masking threshold of the spectral values.
  • the quantizer step size is chosen such that the noise introduced by the quantization remains below the psychoacoustic marker threshold, so that a data rate reduction is achieved without the distortions introduced by the lossy quantization becoming audible.
  • the quantizer 16 is finally followed by an entropy coder 17, which performs a lossless entropy coding of the quantized spectral values.
  • the encoded stereo signal is then present, which comprises side information necessary for decoding in addition to the entropy-coded spectral values.
  • Fig. 3 shows a joint stereo device 60.
  • This device may be a device implementing, for example, the intensity stereo (IS) technique or the binaural cue coding technique (BCC).
  • IS intensity stereo
  • BCC binaural cue coding technique
  • Such a device usually receives as input at least two Channels CH1, CH2, .... CHn, and outputs a single carrier channel and multi-channel parametric information.
  • the parametric data is defined so that an approximation of an original channel (CH1, CH2, ..., CHn) can be calculated in a decoder.
  • the carrier channel will include subband samples, spectral coefficients, time domain samples, etc. that provide a relatively fine representation of the underlying signal, while the parametric data does not include such samples or spectral coefficients, but control parameters for controlling a particular reconstruction algorithm, such as multiplying by weighting. by time shifting, by frequency shifting, etc.
  • the parametric multi-channel information therefore comprises a relatively rough representation of the signal or the associated channel.
  • the amount of data needed by a carrier channel is about 60 to 70 kbps, while the amount of data required by one channel parametric page information is in the range of 1.5 to 2.5 kbps.
  • the above figures apply to compressed data.
  • a non-compressed CD channel requires data rates on the order of about ten times.
  • An example of parametric data is the known scale factors, intensity stereo information, or BCC parameters, as set forth below.
  • the reconstructed signals differ in their amplitude, but they are identical in terms of their phase information.
  • the energy-time envelopes of both original audio channels are maintained by the selective scaling operation, which typically operates in a frequency-selective manner. This corresponds to the human perception of sound at high frequencies, where the dominant spatial information is determined by the energy envelopes.
  • the transmitted signal i. H. the carrier channel is generated from the sum signal of the left channel and the right channel instead of the rotation of both components.
  • this processing i. H. generating intensity-stereo parameters to perform the scaling operations in a frequency-selective manner, i. H. independent for each scale factor band, d. H. for each encoder frequency partition.
  • both channels are combined to form a combined or "carrier" channel and, in addition to the combined channel, the intensity stereo information.
  • the intensity stereo information depends on the energy of the first channel, the energy of the second channel or the energy of the combined channel.
  • the BCC technique is described in the AES convention paper 5574 " Binaural Cue Coding Applied to Stereo and Multichannel Audio Compression ", T. Faller, F. Baumgarte, May 2002, Münch en, described.
  • BCC coding a number of audio input channels are converted into a spectral representation, using a DFT-based transformation with overlapping windows. The resulting spectrum is divided into non-overlapping sections, each of which has an index. Each partition has a bandwidth proportional to the equivalent rectangular bandwidth (ERB).
  • the Inter Channel Level Differences (ICLD) and the Inter Channel Time Differences (ICTD) are determined for each partition and for each frame k. The ICLD and ICTD are quantized and encoded to eventually arrive as page information in a BCC bitstream.
  • the inter-channel level differences and the inter-channel time differences are given for each channel relative to a reference channel. Then, the parameters are calculated according to predetermined formulas that depend on the particular partitions of the signal to be processed.
  • the decoder On the decoder side, the decoder typically receives a mono signal and the BCC bit stream.
  • the mono signal is transformed into the frequency domain and input to a spatial synthesis block which also receives decoded ICLD and ICTD values.
  • the BCC parameters ICLD and ICTD are used to perform a mono signal weighting operation to synthesize the multichannel signals representing, after a frequency / time conversion, a reconstruction of the original multichannel audio signal.
  • the joint stereo module 60 operates to output the channel-side information such that the parametric channel data is quantized and coded ICLD or ICTD parameters using one of the original channels as the reference channel for encoding the channel side information.
  • the carrier signal is formed from the sum of the participating source channels.
  • the above techniques provide only a monodic representation for a decoder that can only process the carrier channel, but is unable to process the parametric data to produce one or more approximations of more than one input channel.
  • Fig. 5 shows such a BCC scheme for encoding / transmission of multi-channel audio signals.
  • the multi-channel audio input signal at an input 110 of a BCC encoder 112 is down-mixed in a so-called downmix block 114.
  • the original multi-channel signal at the input 110 is a 5-channel surround signal having a front left channel, a front right channel, a left surround channel, a right surround channel and a center channel.
  • the downmix block 114 generates a sum signal by simply adding these five channels into a mono signal.
  • This single channel is output on a sum signal line 115.
  • Page information provided by the BCC analysis block 116 is output on a page information line 117.
  • inter-channel level differences ICLD
  • inter-channel time differences ICTD
  • the BCC analysis block 116 is also capable of calculating inter-channel correlation (ICC) values.
  • the sum signal and the page information are transmitted in a quantized and encoded format to a BCC decoder 120.
  • the BCC decoder decomposes the transmitted sum signal into a number of subbands and performs scaling, delays and other processing to provide the subbands of the multichannel audio channels to be output. This processing is performed so that the ICLD, ICTD and ICC parameters (cues) of a reconstructed multichannel signal at output 121 match the corresponding cues for the original multichannel signal at input 110 in BCC encoder 112.
  • the BCC decoder 120 includes a BCC synthesis block 122 and a page information revision block 123.
  • the sum signal on line 115 is fed to a time / frequency conversion unit or filter bank FB 125.
  • FB 125 At the output of the block 125 there exists a number N of subband signals or, in an extreme case, a block of spectral coefficients, when the audio filter bank 125 performs a 1: 1 transform, ie a transform producing N spectral coefficients from N time domain samples.
  • the BCC synthesis block 122 further includes a delay stage 126, a level modification stage 127, a correlation processing stage 128, and an inverse filter bank stage IFB 129.
  • stage 129 At the output of stage 129, the reconstructed Multi-channel audio signal with, for example, five channels in the case of a 5-channel surround system are output to a set of speakers 124 as shown in FIG Fig. 5 or Fig. 4 are shown.
  • the input signal sn is converted into the frequency domain or the filter bank region by means of the element 125.
  • the signal output by element 125 is copied so as to obtain multiple versions of the same signal, as represented by copy node 130.
  • the number of versions of the original signal is equal to the number of output channels in the output signal.
  • each version of the original signal at node 130 undergoes a certain delay d 1 , d 2 , ..., d i , ... d N.
  • the delay parameters are determined by the page information processing block 123 in FIG Fig. 5 and from the inter-channel time differences as determined by the BCC analysis block 116 of FIG Fig. 5 have been calculated derived.
  • the multiplication parameters a 1 , a 2 ,..., A i ,..., A N which are also calculated by the page information processing block 123 based on the interchannel level differences as calculated by the BCC analysis block 116. be calculated.
  • the ICC parameters calculated by BCC analysis block 116 are used to control the functionality of block 128 so that certain correlations between the delayed and level manipulated signals are obtained at the outputs of block 128. It should be noted here that the order of stages 126, 127, 128 is different from the one in FIG Fig. 6 may differ.
  • the BCC analysis is performed frame by frame, so temporally variable, and that further a frequency-wise BCC analysis is obtained as indicated by the filter bank partitioning Fig. 6 is apparent.
  • the BCC parameters are obtained for each spectral band.
  • the audio filter bank 125 decomposes the input signal into, for example, 32 bandpass signals
  • the BCC analysis block obtains a set of BCC parameters for each of the 32 bands.
  • the BCC synthesis block 122 performs Fig. 5 who is detailed in Fig. 6 is a reconstruction, which is based on the exemplified 32 bands.
  • Fig. 4 presented a scenario that is used to determine individual BCC parameters. Normally the ICLD, ICTD and ICC parameters can be defined between channel pairs. However, it is preferred to determine the ICLD and ICTD parameters between a reference channel and each other channel. This is in Fig. 4A shown.
  • ICC parameters can be defined in several ways. Generally speaking, one can determine ICC parameters in the encoder between all possible channel pairs, as shown in FIG Fig. 4B is shown. However, it has been proposed to calculate only ICC parameters between the strongest two channels at a time, as in Fig. 4C where an example is shown in which one ICC parameter between channels 1 and 2 is calculated one at a time, and at another time an ICC parameter between channels 1 and 5 is calculated.
  • the decoder then synthesizes the inter-channel correlation between the strongest channels in the decoder and uses certain heuristic rules to compute and synthesize the inter-channel coherence for the remaining channel pairs.
  • the multiplication parameters a 1 , a N based on the transmitted ICLD parameters
  • the ICLD parameters represent an energy distribution of an original multichannel signal. Without loss of generality, it is preferred as shown in FIG Fig. 4A shown to take four ICLD parameters representing the energy difference between the respective channels and the front left channel.
  • the multiplication parameters a 1 , ..., a N are derived from the ICLD parameters such that the total energy of all reconstructed output channels is the same (or proportional to the energy of the transmitted sum signal).
  • Fig. 7 The embodiment shown is based on the frequency-time conversion, which by the inverse filter banks IFB 129 of Fig. 6 be achieved, waived. Instead, the spectral representations of the individual channels are used at the input of these inverse filter banks and the headphone signal processing device of Fig. 7 supplied to perform the evaluation of the individual multi-channels with the two filters per multi-channel without an additional frequency / time transformation.
  • the multi-channel decoder so z. B. the filter bank 125 of Fig. 6 and the stereo encoder should have the same time / frequency resolution. Furthermore, it is preferred to use one and the same filter bank, which is particularly advantageous in that for the entire processing, as shown in FIG Fig. 1 represents, only a single filter bank is needed. In this case, a particularly efficient processing, since the transformation in the multi-channel decoder and in the stereo encoder do not need to be calculated.
  • the input data or output data in the inventive concept are therefore preferably coded in the frequency domain by means of transformation / filter bank and are coded according to psychoacoustic specifications taking advantage of masking effects, in which case a spectral representation of the signals should be present in particular in the decoder.
  • Examples include MP3 files, AAC files or AC3 files.
  • the input data or output data can also be encoded by summing and subtraction, as is the case with so-called matrixed methods. Examples are Dolby ProLogic, Logic7 or Circle Surround.
  • the data, in particular the multichannel representation can additionally be coded with parametric methods, as is the case with MP3 surround, this method being based on the BCC technique.
  • the inventive method for generating can be implemented in hardware or in software.
  • the implementation may be on a digital storage medium, in particular a floppy disk or CD with electronically readable control signals, which may interact with a programmable computer system such that the method is performed.
  • the invention thus also consists in a computer program product with a program code stored on a machine-readable carrier for carrying out a method according to the invention, when the computer program product runs on a computer.
  • the invention can thus be realized as a computer program with a program code for carrying out the method when the computer program runs on a computer.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Catalysts (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (11)

  1. Dispositif de génération d'un signal audio codé d'un morceau audio ou d'un flux de données audio avec un premier canal stéréo et un deuxième canal stéréo à partir d'une représentation multicanal du morceau audio ou du flux de données audio présentant des informations sur plus de deux canaux multiples, aux caractéristiques suivantes:
    un moyen (11) destiné à préparer les plus de deux canaux multiples à partir de la représentation multicanal;
    un moyen (12) destiné à effectuer un traitement de signal d'écouteur, pour générer un signal stéréo non codé avec un premier canal stéréo non codé (10a) et un deuxième canal stéréo non codé (10b), le moyen (12) destiné à effectuer étant réalisé,
    pour évaluer chaque canal multiple avec une première fonction de filtre (HiL), dérivée d'une position virtuelle d'un haut-parleur pour la reproduction du canal multiple et d'une première position d'oreille virtuelle d'un auditeur, pour le premier canal stéréo et avec une deuxième fonction de filtre (HiR), dérivée d'une position virtuelle du haut-parleur et d'une deuxième position d'oreille virtuelle de l'auditeur, pour le deuxième canal stéréo, pour générer, pour chaque canal multiple, un premier canal évalué et un deuxième canal évalué, les deux positions d'oreille virtuelles de l'auditeur étant différentes,
    pour additionner (22) les premiers canaux évalués, pour obtenir le premier canal stéréo non codé (10a), et
    pour additionner (23) les deuxièmes canaux évalués, pour obtenir le deuxième canal stéréo non codé (10b);
    pour utiliser la première fonction de filtre (HiL) qui tient compte du bruit direct, des réflexions et de la réverbération diffuse et la deuxième fonction de filtre (HiR) qui tient compte du bruit direct, des réflexions et de la réverbération diffuse, et
    un codeur stéréo (13) destiné à coder le premier canal stéréo non codé (10a) et le deuxième canal stéréo non codé (10b), pour obtenir le signal stéréo codé (14), le codeur stéréo étant réalisé de sorte qu'un débit de données requis pour la transmission du signal stéréo codé soit inférieur à un débit de données requis pour la transmission du signal stéréo non codé.
  2. Dispositif selon la revendication 1, dans lequel la première et la deuxième fonction de filtre correspondent à une réponse impulsionnelle de filtre présentant un pic à une faible valeur de temps représentant le bruit direct, plusieurs pics plus petits à des valeurs de temps moyennes représentant les réflexions, et une zone continue qui n'est plus résolue selon des pics individuels et représentant la réverbération diffuse.
  3. Dispositif selon l'une des revendications précédentes,
    dans lequel la représentation multicanal présente un ou plusieurs canaux de base ainsi que des informations de paramètres pour le calcul des canaux multiples à partir d'un ou de plusieurs canaux de base, et
    dans lequel le moyen (11) destiné à préparer est réalisé de manière à calculer, à partir de l'un ou des plusieurs canaux de base et des informations de paramètres, les au moins trois canaux multiples.
  4. Dispositif selon la revendication 3,
    dans lequel le moyen (11) destiné à préparer est réalisé de manière à fournir du côté de la sortie une représentation de plage de fréquences par bloc pour chaque canal multiple, et
    dans lequel le moyen (12) destiné à effectuer est réalisé de manière à évaluer la représentation de plage de fréquences par bloc avec une représentation de plage de fréquences de la première et de la deuxième fonction de filtre.
  5. Dispositif selon l'une des revendications précédentes,
    dans lequel le moyen (12) destiné à effectué est réalisé de manière à fournir une représentation de plage de fréquences par bloc du premier canal stéréo non codé et du deuxième canal stéréo non codé, et
    dans lequel le codeur stéréo (13) est un codeur à base de transformation et est par ailleurs réalisé de manière à traiter la représentation de plage de fréquences par bloc du premier canal stéréo non codé et du deuxième canal stéréo non codé sans transformation de la représentation de plage de fréquences en une représentation dans le temps.
  6. Dispositif selon l'une des revendications précédentes,
    dans lequel le codeur stéréo (13) est réalisé de manière à effectuer un codage stéréo commun (15) du premier et du deuxième canal stéréo.
  7. Dispositif selon l'une des revendications précédentes,
    dans lequel le codeur stéréo (13) est réalisé de manière à quantifier (16) un bloc de valeurs spectrales à l'aide d'un seuil de masquage psycho-acoustique et à le soumettre à un codage entropique (17), pour obtenir le signal stéréo codé.
  8. Dispositif selon l'une des revendications précédentes,
    dans lequel le moyen (11) destiné à préparer est réalisé sous forme de décodeur BCC.
  9. Dispositif selon l'une des revendications précédentes,
    dans lequel le moyen (11) destiné à préparer est réalisé sous forme de décodeur multicanal présentant un banc de filtres avec plusieurs sorties,
    dans lequel le moyen (12) destiné à effectuer est réalisé de manière à évaluer les signaux aux sorties du banc de filtres par la première et la deuxième fonction de filtre, et
    dans lequel le codeur stéréo (13) est réalisé de manière à quantifier le premier canal stéréo non codé présent dans la plage de fréquences et le deuxième canal stéréo non codé présent dans la plage de fréquences (16) et à les soumettre à un codage entropique (17), pour obtenir le signal stéréo codé.
  10. Procédé de génération d'un signal audio codé d'un morceau audio ou d'un flux de données audio avec un premier canal stéréo et un deuxième canal stéréo à partir d'une représentation multicanal du morceau audio ou du flux de données audio présentant des informations sur plus de deux canaux multiples, aux étapes suivantes consistant à:
    préparer (11) les plus de deux canaux multiples à partir de la représentation multicanal;
    effectuer (12) un traitement de signal d'écouteur, pour générer un signal stéréo non codé avec un premier canal stéréo non codé (10a) et un deuxième canal stéréo non codé (10b), l'étape (12) consistant à effectuer (12) présentant les étapes suivantes consistant à:
    évaluer chaque canal multiple avec une première fonction de filtre (HiL), dérivée d'une position virtuelle d'un haut-parleur pour la reproduction du canal multiple et d'une première position d'oreille virtuelle d'un auditeur, pour le premier canal stéréo et avec une deuxième fonction de filtre (HiR), dérivée d'une position virtuelle du haut-parleur et d'une deuxième position d'oreille virtuelle de l'auditeur, pour le deuxième canal stéréo, pour générer, pour chaque canal multiple, un premier canal évalué et un deuxième canal évalué, les deux positions d'oreille virtuelles de l'auditeur étant différentes,
    additionner (22) les premiers canaux évalués, pour obtenir le premier canal stéréo non codé (10a), et
    additionner (23) les deuxièmes canaux évalués, pour obtenir le deuxième canal stéréo non codé (10b);
    utiliser la première fonction de filtre (HiL) qui tient compte du bruit direct, des réflexions et de la réverbération diffuse et la deuxième fonction de filtre (HiR) qui tient compte du bruit direct, des réflexions et de la réverbération diffuse; et
    coder stéréo (13) le premier canal stéréo non codé (10a) et le deuxième canal stéréo non codé (10b), pour obtenir le signal stéréo codé (14), l'étape de codage stéréo étant réalisée de sorte qu'un débit de données requis pour la transmission du signal stéréo codé soit inférieur à un débit de données requis pour la transmission du signal stéréo non codé.
  11. Programme d'ordinateur avec un code de programme pour réaliser le procédé pour générer un signal stéréo codé selon la revendication 10 lorsque le programme d'ordinateur est exécuté sur un ordinateur.
EP06707184A 2005-03-04 2006-02-22 Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio Active EP1854334B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL06707184T PL1854334T3 (pl) 2005-03-04 2006-02-22 Urządzenie i sposób do generowania zakodowanego sygnału stereo fragmentu dźwiękowego lub strumienia danych audio
EP09006142.5A EP2094031A3 (fr) 2005-03-04 2006-02-22 Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005010057A DE102005010057A1 (de) 2005-03-04 2005-03-04 Vorrichtung und Verfahren zum Erzeugen eines codierten Stereo-Signals eines Audiostücks oder Audiodatenstroms
PCT/EP2006/001622 WO2006094635A1 (fr) 2005-03-04 2006-02-22 Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP09006142.5A Division EP2094031A3 (fr) 2005-03-04 2006-02-22 Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio
EP09006142.5 Division-Into 2009-05-05

Publications (2)

Publication Number Publication Date
EP1854334A1 EP1854334A1 (fr) 2007-11-14
EP1854334B1 true EP1854334B1 (fr) 2010-03-17

Family

ID=36649539

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09006142.5A Ceased EP2094031A3 (fr) 2005-03-04 2006-02-22 Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio
EP06707184A Active EP1854334B1 (fr) 2005-03-04 2006-02-22 Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP09006142.5A Ceased EP2094031A3 (fr) 2005-03-04 2006-02-22 Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio

Country Status (20)

Country Link
US (1) US8553895B2 (fr)
EP (2) EP2094031A3 (fr)
JP (1) JP4987736B2 (fr)
KR (1) KR100928311B1 (fr)
CN (1) CN101133680B (fr)
AT (1) ATE461591T1 (fr)
AU (1) AU2006222285B2 (fr)
BR (1) BRPI0608036B1 (fr)
CA (1) CA2599969C (fr)
DE (2) DE102005010057A1 (fr)
ES (1) ES2340796T3 (fr)
HK (1) HK1111855A1 (fr)
IL (1) IL185452A (fr)
MX (1) MX2007010636A (fr)
MY (1) MY140741A (fr)
NO (1) NO339958B1 (fr)
PL (1) PL1854334T3 (fr)
RU (1) RU2376726C2 (fr)
TW (1) TWI322630B (fr)
WO (1) WO2006094635A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2094031A3 (fr) * 2005-03-04 2014-10-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7876904B2 (en) * 2006-07-08 2011-01-25 Nokia Corporation Dynamic decoding of binaural audio signals
KR101499785B1 (ko) 2008-10-23 2015-03-09 삼성전자주식회사 모바일 디바이스를 위한 오디오 처리 장치 및 그 방법
ES2525839T3 (es) 2010-12-03 2014-12-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Adquisición de sonido mediante la extracción de información geométrica de estimativos de dirección de llegada
EP2705516B1 (fr) * 2011-05-04 2016-07-06 Nokia Technologies Oy Codage de signaux stéréophoniques
FR2976759B1 (fr) * 2011-06-16 2013-08-09 Jean Luc Haurais Procede de traitement d'un signal audio pour une restitution amelioree.
JP6007474B2 (ja) * 2011-10-07 2016-10-12 ソニー株式会社 音声信号処理装置、音声信号処理方法、プログラムおよび記録媒体
CN104041080B (zh) * 2012-01-17 2016-08-24 皇家飞利浦有限公司 多通道音频渲染
US9602927B2 (en) * 2012-02-13 2017-03-21 Conexant Systems, Inc. Speaker and room virtualization using headphones
KR20140017338A (ko) * 2012-07-31 2014-02-11 인텔렉추얼디스커버리 주식회사 오디오 신호 처리 장치 및 방법
JP6160072B2 (ja) * 2012-12-06 2017-07-12 富士通株式会社 オーディオ信号符号化装置および方法、オーディオ信号伝送システムおよび方法、オーディオ信号復号装置
MX347551B (es) 2013-01-15 2017-05-02 Koninklijke Philips Nv Procesamiento de audio binaural.
CN104919820B (zh) * 2013-01-17 2017-04-26 皇家飞利浦有限公司 双耳音频处理
EP2757559A1 (fr) 2013-01-22 2014-07-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Appareil et procédé de codage d'objet audio spatial employant des objets cachés pour manipulation de mélange de signaux
CN108806704B (zh) 2013-04-19 2023-06-06 韩国电子通信研究院 多信道音频信号处理装置及方法
CN108810793B (zh) 2013-04-19 2020-12-15 韩国电子通信研究院 多信道音频信号处理装置及方法
US9412385B2 (en) * 2013-05-28 2016-08-09 Qualcomm Incorporated Performing spatial masking with respect to spherical harmonic coefficients
US9319819B2 (en) * 2013-07-25 2016-04-19 Etri Binaural rendering method and apparatus for decoding multi channel audio
TWI713018B (zh) * 2013-09-12 2020-12-11 瑞典商杜比國際公司 多聲道音訊系統中之解碼方法、解碼裝置、包含用於執行解碼方法的指令之非暫態電腦可讀取的媒體之電腦程式產品、包含解碼裝置的音訊系統
WO2015059153A1 (fr) 2013-10-21 2015-04-30 Dolby International Ab Reconstruction paramétrique de signaux audio
EP3611727B1 (fr) * 2015-03-03 2022-05-04 Dolby Laboratories Licensing Corporation Amélioration de signaux audio spatiaux par décorrélation modulée
EP3067885A1 (fr) * 2015-03-09 2016-09-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Appareil et procédé pour le codage ou le décodage d'un signal multicanal
US10672408B2 (en) 2015-08-25 2020-06-02 Dolby Laboratories Licensing Corporation Audio decoder and decoding method
TWI577194B (zh) * 2015-10-22 2017-04-01 山衛科技股份有限公司 環境音源辨識系統及其環境音源辨識之方法
EP3208800A1 (fr) 2016-02-17 2017-08-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Appareil et procédé pour enregistrement stéréo dans un codage multi-canaux
US10187740B2 (en) * 2016-09-23 2019-01-22 Apple Inc. Producing headphone driver signals in a digital audio signal processing binaural rendering environment
EP3530007A1 (fr) * 2016-10-19 2019-08-28 Audible Reality Inc. Système et procédé de génération d'une image audio
US11523239B2 (en) 2019-07-22 2022-12-06 Hisense Visual Technology Co., Ltd. Display apparatus and method for processing audio
CN112261545A (zh) * 2019-07-22 2021-01-22 海信视像科技股份有限公司 显示装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768451A1 (fr) * 2004-06-14 2007-03-28 Matsushita Electric Industrial Co., Ltd. Dispositif de codage de signal acoustique et dispositif de décodage de signal acoustique

Family Cites Families (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US602349A (en) * 1898-04-12 Abrading mechanism
US5632005A (en) 1991-01-08 1997-05-20 Ray Milton Dolby Encoder/decoder for multidimensional sound fields
JPH04240896A (ja) * 1991-01-25 1992-08-28 Fujitsu Ten Ltd 音場制御装置
FR2688371B1 (fr) * 1992-03-03 1997-05-23 France Telecom Procede et systeme de spatialisation artificielle de signaux audio-numeriques.
US5703999A (en) 1992-05-25 1997-12-30 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Process for reducing data in the transmission and/or storage of digital signals from several interdependent channels
WO1994001933A1 (fr) 1992-07-07 1994-01-20 Lake Dsp Pty. Limited Filtre numerique a haute precision et a haut rendement
DE4236989C2 (de) 1992-11-02 1994-11-17 Fraunhofer Ges Forschung Verfahren zur Übertragung und/oder Speicherung digitaler Signale mehrerer Kanäle
JPH06269097A (ja) * 1993-03-11 1994-09-22 Sony Corp 音響装置
US5488665A (en) 1993-11-23 1996-01-30 At&T Corp. Multi-channel perceptual audio compression system with encoding mode switching among matrixed channels
JP3404837B2 (ja) * 1993-12-07 2003-05-12 ソニー株式会社 多層符号化装置
US5659619A (en) * 1994-05-11 1997-08-19 Aureal Semiconductor, Inc. Three-dimensional virtual audio display employing reduced complexity imaging filters
WO2004103023A1 (fr) * 1995-09-26 2004-11-25 Ikuichiro Kinoshita Procede de preparation de tableau de fonction de transfert pour localiser une image sonore virtuelle, support d'enregistrement sur lequel ce tableau est enregistre et procede d'edition de signal acoustique utilisant ce support
US5956674A (en) * 1995-12-01 1999-09-21 Digital Theater Systems, Inc. Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels
US5742689A (en) * 1996-01-04 1998-04-21 Virtual Listening Systems, Inc. Method and device for processing a multichannel signal for use with a headphone
US5812971A (en) * 1996-03-22 1998-09-22 Lucent Technologies Inc. Enhanced joint stereo coding method using temporal envelope shaping
CN1204692C (zh) * 1996-04-10 2005-06-01 皇家菲利浦电子有限公司 编码若干信息信号的编码装置
EP1025743B1 (fr) 1997-09-16 2013-06-19 Dolby Laboratories Licensing Corporation Utilisation d'effets de filtrage dans les casques d'ecoute stereophoniques pour ameliorer la spatialisation d'une source autour d'un auditeur
KR100598003B1 (ko) * 1998-03-25 2006-07-06 레이크 테크놀로지 리미티드 오디오 신호 처리 방법 및 장치
AUPP271598A0 (en) * 1998-03-31 1998-04-23 Lake Dsp Pty Limited Headtracked processing for headtracked playback of audio signals
CN1065400C (zh) 1998-09-01 2001-05-02 国家科学技术委员会高技术研究发展中心 兼容ac－3和mpeg－2的音频编解码器
US6751177B1 (en) * 1998-09-02 2004-06-15 Matsushita Electric Industrial Co., Ltd. Signal processor
DE19932062A1 (de) 1999-07-12 2001-01-18 Bosch Gmbh Robert Verfahren zur Aufbereitung von quellcodierten Audiodaten sowie Sender und Empfänger hierzu
JP2001100792A (ja) * 1999-09-28 2001-04-13 Sanyo Electric Co Ltd 符号化方法、符号化装置およびそれを備える通信システム
JP3335605B2 (ja) * 2000-03-13 2002-10-21 日本電信電話株式会社 ステレオ信号符号化方法
JP3616307B2 (ja) * 2000-05-22 2005-02-02 日本電信電話株式会社 音声・楽音信号符号化方法及びこの方法を実行するプログラムを記録した記録媒体
JP2002191099A (ja) * 2000-09-26 2002-07-05 Matsushita Electric Ind Co Ltd 信号処理装置
JP3228474B2 (ja) * 2001-01-18 2001-11-12 日本ビクター株式会社 音声符号化装置及び音声復号化方法
JP2002262385A (ja) * 2001-02-27 2002-09-13 Victor Co Of Japan Ltd 音像定位信号の生成方法、及び音像定位信号生成装置
US7006636B2 (en) 2002-05-24 2006-02-28 Agere Systems Inc. Coherence-based audio coding and synthesis
US20030035553A1 (en) 2001-08-10 2003-02-20 Frank Baumgarte Backwards-compatible perceptual coding of spatial cues
US7116787B2 (en) 2001-05-04 2006-10-03 Agere Systems Inc. Perceptual synthesis of auditory scenes
JP2003009296A (ja) * 2001-06-22 2003-01-10 Matsushita Electric Ind Co Ltd 音響処理装置および音響処理方法
US20050141722A1 (en) 2002-04-05 2005-06-30 Koninklijke Philips Electronics N.V. Signal processing
EP1500083B1 (fr) * 2002-04-22 2006-06-28 Koninklijke Philips Electronics N.V. Representation parametrique de signaux audio multicanaux
KR100522593B1 (ko) 2002-07-08 2005-10-19 삼성전자주식회사 다채널 입체음향 사운드 생성방법 및 장치
DE60317203T2 (de) * 2002-07-12 2008-08-07 Koninklijke Philips Electronics N.V. Audio-kodierung
KR20040027015A (ko) * 2002-09-27 2004-04-01 (주)엑스파미디어 스트리밍시 오디오의 대역폭을 줄이기 위하여 몰입형오디오를 이용한 새로운 다운믹싱 기법
JP4084990B2 (ja) * 2002-11-19 2008-04-30 株式会社ケンウッド エンコード装置、デコード装置、エンコード方法およびデコード方法
JP4369140B2 (ja) 2003-02-17 2009-11-18 パナソニック株式会社 オーディオ高能率符号化装置、オーディオ高能率符号化方法、オーディオ高能率符号化プログラム及びその記録媒体
FR2851879A1 (fr) * 2003-02-27 2004-09-03 France Telecom Procede de traitement de donnees sonores compressees, pour spatialisation.
JP2004309921A (ja) * 2003-04-09 2004-11-04 Sony Corp 符号化装置、符号化方法及びプログラム
US7949141B2 (en) * 2003-11-12 2011-05-24 Dolby Laboratories Licensing Corporation Processing audio signals with head related transfer function filters and a reverberator
US7394903B2 (en) * 2004-01-20 2008-07-01 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Apparatus and method for constructing a multi-channel output signal or for generating a downmix signal
US20050276430A1 (en) * 2004-05-28 2005-12-15 Microsoft Corporation Fast headphone virtualization
US20050273324A1 (en) * 2004-06-08 2005-12-08 Expamedia, Inc. System for providing audio data and providing method thereof
DE102005010057A1 (de) * 2005-03-04 2006-09-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Erzeugen eines codierten Stereo-Signals eines Audiostücks oder Audiodatenstroms

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768451A1 (fr) * 2004-06-14 2007-03-28 Matsushita Electric Industrial Co., Ltd. Dispositif de codage de signal acoustique et dispositif de décodage de signal acoustique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2094031A3 (fr) * 2005-03-04 2014-10-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif et procédé de production d'un signal stéréo codé d'un élément audio ou d'un courant de données audio

Also Published As

Publication number Publication date
KR20070100838A (ko) 2007-10-11
CA2599969A1 (fr) 2006-09-14
US20070297616A1 (en) 2007-12-27
DE502006006444D1 (de) 2010-04-29
US8553895B2 (en) 2013-10-08
ATE461591T1 (de) 2010-04-15
MY140741A (en) 2010-01-15
DE102005010057A1 (de) 2006-09-07
RU2376726C2 (ru) 2009-12-20
IL185452A0 (en) 2008-01-06
IL185452A (en) 2011-07-31
EP2094031A3 (fr) 2014-10-01
AU2006222285B2 (en) 2009-01-08
KR100928311B1 (ko) 2009-11-25
MX2007010636A (es) 2007-10-10
AU2006222285A1 (en) 2006-09-14
BRPI0608036B1 (pt) 2019-05-07
TWI322630B (en) 2010-03-21
NO339958B1 (no) 2017-02-20
NO20075004L (no) 2007-10-03
BRPI0608036A2 (pt) 2009-11-03
JP2008532395A (ja) 2008-08-14
ES2340796T3 (es) 2010-06-09
CN101133680B (zh) 2012-08-08
HK1111855A1 (en) 2008-08-15
EP2094031A2 (fr) 2009-08-26
WO2006094635A1 (fr) 2006-09-14
CN101133680A (zh) 2008-02-27
JP4987736B2 (ja) 2012-07-25
TW200701823A (en) 2007-01-01
PL1854334T3 (pl) 2010-09-30
EP1854334A1 (fr) 2007-11-14
CA2599969C (fr) 2012-10-02
RU2007136792A (ru) 2009-04-10

Similar Documents

Publication Publication Date Title
EP1854334B1 (fr) Dispositif et procede de production d'un signal stereo code d'un morceau audio ou d'un flux de donnees audio
DE602004004168T2 (de) Kompatible mehrkanal-codierung/-decodierung
DE602006000239T2 (de) Energieabhängige quantisierung für effiziente kodierung räumlicher audioparameter
DE602005006385T2 (de) Vorrichtung und verfahren zum konstruieren eines mehrkanaligen ausgangssignals oder zum erzeugen eines downmix-signals
EP1687809B1 (fr) Appareil et procede pour la reconstitution d'un signal audio multi-canaux et pour generer un enregistrement des parametres correspondants
DE102006050068B4 (de) Vorrichtung und Verfahren zum Erzeugen eines Umgebungssignals aus einem Audiosignal, Vorrichtung und Verfahren zum Ableiten eines Mehrkanal-Audiosignals aus einem Audiosignal und Computerprogramm
EP1763870B1 (fr) Production d'un signal multicanal code, et decodage d'un signal multicanal code
EP1774515B1 (fr) Appareil et procede pour generer un signal de sortie multicanal
EP1999999B1 (fr) Procédé de production de mixages réducteurs spatiaux à partir de représentations paramétriques de signaux multicanal
DE602005002942T2 (de) Verfahren zur darstellung von mehrkanal-audiosignalen
DE69633633T2 (de) Mehrkanaliger prädiktiver subband-kodierer mit adaptiver, psychoakustischer bitzuweisung
EP1829026B1 (fr) Information compacte pour le codage parametrique de signal audio spatial
DE602005006424T2 (de) Stereokompatible mehrkanal-audiokodierung
DE69214523T2 (de) Dekodierer für variable anzahl von kanaldarstellungen mehrdimensionaler schallfelder
DE102013223201B3 (de) Verfahren und Vorrichtung zum Komprimieren und Dekomprimieren von Schallfelddaten eines Gebietes
IL182236A (en) Individual channel design for BCC schemes and the like
WO2007118533A1 (fr) Dispositif et procédé pour la génération d'un signal d'ambiance
WO2014072513A1 (fr) Codage inverse non linéaire de signaux multicanaux
DE102020210917B4 (de) Verbesserter M/S-Stereo-Codierer und -Decodierer
WO2005083702A1 (fr) Dispositif et procede d'ecriture sur un cd audio, et cd audio

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

17P Request for examination filed

Effective date: 20070809

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20081103

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 502006006444

Country of ref document: DE

Date of ref document: 20100429

Kind code of ref document: P

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2340796

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: GR

Ref legal event code: EP

Ref document number: 20100401411

Country of ref document: GR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

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: 20100317

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20100317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

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: 20100317

Ref country code: FI

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: 20100317

Ref country code: SI

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: 20100317

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

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: 20100317

Ref country code: EE

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: 20100317

Ref country code: CY

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: 20100317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

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: 20100317

Ref country code: BG

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: 20100617

Ref country code: IS

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: 20100717

Ref country code: CZ

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: 20100317

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

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

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: 20100317

Ref country code: PT

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: 20100719

Ref country code: IE

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: 20100317

26N No opposition filed

Effective date: 20101220

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110228

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: 20110222

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

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: 20100317

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 12

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 20240219

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20240220

Year of fee payment: 19

Ref country code: ES

Payment date: 20240319

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20240216

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20240216

Year of fee payment: 19

Ref country code: GB

Payment date: 20240222

Year of fee payment: 19

Ref country code: CH

Payment date: 20240301

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20240209

Year of fee payment: 19

Ref country code: SE

Payment date: 20240221

Year of fee payment: 19

Ref country code: PL

Payment date: 20240212

Year of fee payment: 19

Ref country code: IT

Payment date: 20240229

Year of fee payment: 19

Ref country code: FR

Payment date: 20240222

Year of fee payment: 19

Ref country code: BE

Payment date: 20240219

Year of fee payment: 19