CN102695116B - Sound acquisition, processing and recurrence method - Google Patents
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Abstract
The invention provides a sound acquisition, processing and recurrence method. The method comprises the steps as follows: sound signals pass through a microphone signal transducer, and then are distributed to each input channel; sound signal in each input channel is amplified; the amplified sound signals are executed for D/A conversion and respectively transmitted to each signal distributor; the signal distributors respectively transmits each sound signal to a registered judgment device, a real-time signal judgment device and a signal stream selector; and the registered judgment device, the real-time signal judgment device and the signal stream selector respectively process each received sound signal. The sound acquisition, the sound processing and recurrence method, which are provided by the invention can lower the distortion of a sound system, improve a dynamic state, and increase vivid experience of listening sounds.
Description
Technical field
The invention belongs to audio system field, be specifically related to a kind of sound collection, process and reproducting method.
Background technology
In sound collection field, existing audio system from Bell invented phone to Edison invented gramophone since, what all adopt is that a rail record carrier comes recording voice and transmission sound (sound of same acoustic-electrical transducer), even if some recording device can be recorded as two rails by certain establishing a signal, but also there is not judgment means, need the signal selecting final needs manually, more do not form multistage dynamic audio stream.
At acoustic processing and field of reproduction, present Doby 5.1 is that sound has been enrolled multiple passage, this passage refers to the passage of 5 different directions, each direction remains only has a signal, can not realize, in monophony, two channel stereo and surround sound stereophonic sound system, the sound in each direction is made different multiple magnification levels, more can not form multistage Dynamic Signal in each direction.And Doby is in the process of carrying out acoustic playback, is cut away around the low frequency inside passage, then the low frequency of all passages is superposed, then playback is carried out by a bass channel during playback, increase 10dB during playback to amplify, but it is not Whole frequency band, neither multichannel.
There is not sound deterministic process in traditional recording system.After sound is zoomed into line level from microphone signal amplifier by traditional recording system, be often directly recorded on simulation medium or be directly recorded on digital media after AD.Traditional recording system in order to the undistorted method taked be after sound zooms into line level from microphone signal amplifier, directly add a compressor reducer or limiter, can control the dynamic range that sound is no more than recording medium like this, but in fact the original of sound is dynamically changed by nonlinear.
And existing sound reproducing method is for a sound channel, after always using the mode unified by all sound elements to carry out audio mixing, form a signal, then carry out public address.For source of sound, owing to mixing according to the method described above, so all sources of sound can reproduce according to same magnification ratio.In the field of surround sound in legacy system, although introduce the gain of low channel than other passage height 10db, its operation measure directly mixes after all multi-channel high frequency excisions, realized together by one group of transcriber.
Summary of the invention
For overcoming above-mentioned defect, the invention provides a kind of sound collection, process and reproducting method, can real recording voice dynamically original, reduce the risk of audio distortion; Improve the details of sound system and dynamic reproduction; Improve the sound system simulation people verisimilitude that audition is experienced in non-natural sound field.
For achieving the above object, the invention provides a kind of sound collection, process and reproducting method, its improvements are, described method comprises the steps:
(1). voice signal, after described transducer, is assigned to each input channel (ICH1, ICH2, ICH3 by described microphone signal distributor by voice signal ... ICHN);
(2). by each input channel (ICH1, ICH2, ICH3 ... ICHN) voice signal in carries out different stage and amplifies process;
(3). carry out analog-to-digital conversion by through amplifying the voice signal after process, and be transferred to each signal distributor (1,2,3 respectively ... n) in;
(4). described signal distributor (1,2,3 ... n) each voice signal is transferred to respectively described in deposit in formula judgment means, described stream signal real-time judge device and described signal stream selector;
(5). described in deposit formula judgment means, described stream signal real-time judge device and described signal stream selector and respectively each voice signal received processed;
In described step 2, different stage refers to the amplification multistage amplifying unit being carried out between 0db to 100db to different stage to voice signal.The difference in magnification level is there is in every one-level when amplifying.
In optimal technical scheme provided by the invention, in described step 2, the voice signal in described input channel 1 (ICH1) carries out signal attenuation by described PAD attenuating device, then carries out amplification process by corresponding multistage amplifying unit.
In second optimal technical scheme provided by the invention, in described step 5, described in deposit the treatment step of formula judgment means to voice signal as follows:
(A). signal distributor described in buffer memory (1,2,3 ... n) voice signal sent;
(B). successively distortion judgement is carried out to the voice signal be stored in described buffer, the voice signal of distortion is deleted from described buffer;
(C). from each distortionless voice signal, select a road from the nearest signal of 0dbfs, by this road Signal transmissions to described memory.
In 3rd optimal technical scheme provided by the invention, when the distortion carrying out voice signal judges, if Zhi Sheng mono-road voice signal, Ze Jianggai road transmission of sound signals is to described memory.
In 4th optimal technical scheme provided by the invention, in described step 5, the treatment step of described stream signal real-time judge device to voice signal is as follows:
(a). successively to each road input channel (ICH1, ICH2, ICH3 ... whether the level of the voice signal ICHN) judges lower than cutting value;
(b). if the level of voice signal is lower than cutting value, then this voice signal is outputted to corresponding output channel (OCHn) by described digital processing unit;
(c). if signal is higher than cutting value, and Ze Duigai road signal suppresses, and register starts to judge ICHn+1 road signal, until a certain road signal is lower than cutting value, then returns step b;
Wherein, in above b, step c, the voice signal of other input channel is all in holddown; Cutting value is critical value.
In 5th optimal technical scheme provided by the invention, after described step 5, there are following steps:
(aa). described processing unit receives each voice signal that described output channel (OCHn) exports, utilizing status device, attenuation module, gain module, tone color adjusting module and sound locating module process each voice signal, and described reproduction units is exported in the voice signal merging after process;
(bb). described reproduction units utilizes different power amplifiers to amplify each road voice signal, will amplify Hou Ge road transmission of sound signals in described speaker unit or described multistage dynamic speaker unit.
In 6th optimal technical scheme provided by the invention, in described step aa, the treatment step of described processing unit to each road voice signal is as follows:
(aa-1). attenuation/gain is carried out to each road voice signal;
(aa-2). utilizing status Qi Duige road voice signal processes, and carries out acoustic image distribution;
(aa-3). carry out the multistage dynamic assignment of each road voice signal;
(aa-4). carry out attenuation/gain to the voice signal of each rank, the voice signal of utilizing status device to attenuation/gain processes;
(aa-5). merged by each road voice signal, the voice signal after utilizing status device is combined processes;
(aa-6). attenuation/gain is carried out to voice signal, exports the voice signal after carrying out attenuation/gain;
Wherein, effect device is internal effects device or the external effects device of real-time multi-stage Dynamic Signal current processing device.
In 7th optimal technical scheme provided by the invention, in described step aa-3,
(aa-3a). certain one-level that one group of dynamic signal of list is assigned to dynamical output more than a certain group (OCHn) by user exports;
(aa-3b). Dynamic Signal more than of input processor group is assigned on the dynamical output more than a certain group (OCHn) of output by user;
(aa-3c). one group of list Dynamic Signal is Dynamic Signal more than a group (OCHn) according to signal magnitude Resurvey by user;
(aa-3d). user is merged into one group of list Dynamic Signal at Dynamic Signal more than a group, and certain one-level being assigned to dynamical output more than a certain group (OCHn) exports.
Compared with the prior art, a kind of sound collection provided by the invention, process and reproducting method, recording voice that can be real dynamically original, greatly reduce the risk of audio distortion, in professional recording process, greatly can reduce the workload of people, and native system greatly can increase dynamic range in automatic pickup and Recording Process; Also can be acoustic processing system and sound reinforcement system provides corresponding multistage dynamic voice signal, native system can be compatible with tradition recording and pickup process, if native system is for communication system, coordinates acoustic processing and playback system to use, Larger Dynamic high-fidelity transfer sound can be realized under low bit-rate state; Moreover native system can receive process classical signal, can receive again, process the multistage Dynamic Signal stream picked up according to this pickup system method; Namely single dynamic classical signal can be exported, multistage Dynamic Signal can be exported again, can by different sound elements, Whole frequency band (20hz-20khz) is programmed into the audio frequency output channel of different stage, and these passages can be combined into again the various ways such as single channel group, binary channels group and the playback of surround sound playback group.
Accompanying drawing explanation
Fig. 1 is the transmission of sound signals schematic diagram 1 of sound collection, process, reproducting method.
Fig. 2 is the transmission of sound signals schematic diagram 2 of sound collection, process, reproducting method.
Embodiment
The invention provides a kind of sound collection, process, playback system, it comprises:
Voice signal pickup, judgement and harvester and method.
By the sound in natural sound field after acoustic-electrical transducer, by microphone signal distributor, signal is assigned as identical multichannel, different magnification levels is carried out to each road signal.The magnification level on each road, and differential between them can by User Defined.User can by wherein one or more amplifies after using PAD [4] decay again.
Each road signal after amplification sends into a signal distributor respectively, and try again distribution, and each bars is divided into three tunnels, hereafter claims a group, b group, c group.
If user uses digital audio system, after signal amplifies, after respectively analog to digital conversion (AD conversion) being carried out to each level, then signal is sent into signal distributor.Containing AD conversion link in accompanying drawing, analogue system does not comprise this link.
A group signal is sent into stream signal real-time judge device, this judgment means, according to the height of level, judges signal and makes choice.
With digital audio system citing, its concrete choice detection algorithm is:
State A: system first judges path (ICH1) [2] signal of the maximum one-level of magnification level, if signal from undistorted be also greater than 6db time (full-scale electrical level table is lower than-6dbfs during cutting value.The variable that this numeral can be arranged according to user is recommendation at this), this signal outputs to the first rail (OCH1) [3] by digital processing unit; The now path of other magnification levels all, is all in the suppression stage.
State B: when ICH1 signal reaches cutting value, output signal starts to carry out digital level compression process by stream signal real-time judge device, and making it output signal is 0, and such OCH1 will shutdown signal.It carries out start-up time of compressing and release time is adjustable; At this simultaneously, system is closed ICH2 and is suppressed, and makes signal output to OCH2; Its release time and the compression time of process first passage are through accurate adjustment, and such OCH1 and OCH2 signal just can carry out seamless splicing of dissolving, and forms the on all four accurate signal of phase place;
If when the state of ICH2 arrives cutting value, its track is again by the same operation that executing state B carries out at ICH1, therefore output signal will shift from OCH2 to OCH3 again;
Therefore, sum up this process, we draw stream signal real-time judge device, are finally actually and are selecting signal to be on OCHN or exporting on OCH (N+1).
After choice, each road OCH obtained is recorded on many recording mediums respectively simultaneously, or the multi-level acoustic processing transcriber that signal transmission is provided below to the present invention or directly carry out record on the recording medium.
In digital audio system, after 3 process done, by b group signal transmission to depositing formula judgment means, judged by judgment means, select from the nearest and distortionless bars of peak distortion point, be stored on a recording medium, this is compatible with the collection of traditional digital audio sound system, process, reproducting method.[5]
Deposit formula judgment means operation principle:
State A: all signals are all undistorted, is at this moment all retained in all signals in buffer memory.
State B: if a certain road distorted signals, other road signal is undistorted, at this moment deletes in signal village, distortion one road buffer memory.
State C: if after the generation of B process, the also distortion of Zhi Sheng mono-road signal, now retains this road signal.
State D: after signal stream completes and enters, if there is multichannel to select signal, selects a road from the nearest signal of 0dbfs.Be recorded in final holder
State E: after signal stream completes and enters, if state C occurs, is then recorded to signal in final holder, and in addition special signal label informs user.
A is described: if to flow to the angle of incidence excessive for signal, cause buffer memory to take, the formula determining device of depositing can by data temporary storage in final holder, and signal stream completes judgement after completing and entering, and chooses data, more unwanted data is deleted.
B is described: for the pulse of sudden non-natural sound field, native system has solution.
By c group signal transmission to signal stream selector, select the live signal stream being compatible with traditional pickup process and producing.
In the actual manufacture of equipment, native system can add an interference rejection apparatus in signal stream, in order to avoid the signals such as transducer colliding with in actual use, the plug of wind sense noise, circuit, rosin joint or sudden system primary noise have an impact to the record of metasomite and deterministic process.
Stream signal real-time judge device both can be realized also directly can realizing with companding analog circuit by digital circuit and program.
Footnote illustrates:
[1] for equipment and the algorithm of acoustic processing, its effect is suppressed by the sound lower than certain level.
[2] ICH1 is the abbreviation of No.1input channel, and ICH is the description of the input channel before determining device, and its numeral is the ordering of number of stages of amplification from high to low.Hereafter be not repeated.
[3] OCH1 is the abbreviation of No.1output chiannel, and OCH is the output channel after determining device and describes the ordering that its numeral is number of stages of amplification from high to low.Hereafter be not repeated.
[4] a kind of signal attenuator, usually be used in before signal enters microphone amplifier, signal is decayed, the effect done like this is, if not do not amplify signal arrange beyond the maximum input level of microphone signal amplifier, use this Pad circuit that signal can be allowed to be operated in normal range (NR).
[5] in simulated sound system, this flow process does not exist, and this flow process is only set up in digital system.
Native system advantage:
Real recording voice dynamically original.
Greatly reduce the risk of audio distortion.
Because above 2 points, this cover system can cross in professional recording process the workload greatly reducing people.
This cover system greatly increases dynamic range in automatic pickup and Recording Process.
Corresponding multistage dynamic voice signal can be provided for the acoustic processing system after this patent and sound reinforcement system.
Native system can be compatible with tradition recording and pickup process.
If native system is for communication system, coordinates acoustic processing hereinafter and playback system, Larger Dynamic high-fidelity transfer sound can be realized under low bit-rate state.
Acoustic processing and transcriber and method
Principle
By all elements picked up in natural sound field, reproduce according to different magnification levels respectively, element is not mixed when its audio mixing.
By all elements picked up in natural sound field, carry out classification and be mixed into several groups, each group is reproduced according to different magnification levels respectively, when its audio mixing, sound element is mixed into several groups according to the requirement of creator.
By the real-time multi-stage signal stream that the voice signal pickup mentioned in above, judgment means produce, reproduce with multi-level amplification.
For traditional single-stage level signal, the present invention's said voice signal pickup, judgment means above can be used, after single-stage level signal is carried out pre-amplification, form multilevel signal stream, reproduce with multi-level amplification.
For traditional single-stage level signal, user also can specify this signal directly use certain one-level or use N level simultaneously, reproduces signal.This method is compatible with sound system reproducting method.
6, also the scope of the invention is belonged to for multistage dynamic enclosure and multistage dynamic power amplifier.
The application of SoundRec, process and reproducting method: cinema, family and multimedia Hi-Fi sound-box field, earphone (Personal loudspeaker box baffle) field, computer audio field, performance, public broadcasting field, audio amplifier field and TV station, radio station audio area in vehicle-mounted and other vehicles, the communications field.
As shown in Figure 1, 2, a kind of SoundRec, process and reproducting method, comprise the steps:
(1). voice signal, after described transducer, is assigned to each input channel (ICH1, ICH2, ICH3 by described microphone signal distributor by voice signal ... ICHN);
(2). by each input channel (ICH1, ICH2, ICH3 ... ICHN) voice signal in carries out different stage and amplifies process;
(3). carry out analog-to-digital conversion by through amplifying the voice signal after process, and be transferred to each signal distributor (1,2,3 respectively ... n) in;
(4). described signal distributor (1,2,3 ... n) each voice signal is transferred to respectively described in deposit in formula judgment means, described stream signal real-time judge device and described signal stream selector;
(5). described in deposit formula judgment means, described stream signal real-time judge device and described signal stream selector and respectively each voice signal received processed;
In described step 2, different stage refers to the amplification multistage amplifying unit being carried out between 0db to 100db to different stage to voice signal.
This is in described step 2, and the voice signal in described input channel 1 (ICH1) carries out signal attenuation by described PAD attenuating device, then carries out amplification process by corresponding multistage amplifying unit.
In described step 5, described in deposit the treatment step of formula judgment means to voice signal as follows:
(A). signal distributor described in buffer memory (1,2,3 ... n) voice signal sent;
(B). successively distortion judgement is carried out to the voice signal be stored in described buffer, the voice signal of distortion is deleted from described buffer;
(C). from each distortionless voice signal, select a road from the nearest signal of 0dbfs, by this road Signal transmissions to described memory.
When the distortion carrying out voice signal judges, if Zhi Sheng mono-road voice signal, Ze Jianggai road transmission of sound signals is to described memory.
In described step 5, the treatment step of described stream signal real-time judge device to voice signal is as follows:
(a). successively to each road input channel (ICH1, ICH2, ICH3 ... whether the level of the voice signal ICHN) judges lower than cutting value;
(b). if the level of voice signal is lower than cutting value, then this voice signal is outputted to corresponding output channel (OCHn) by described digital processing unit;
(c). if signal is higher than cutting value, and Ze Duigai road signal suppresses, and register starts to judge ICHn+1 road signal, until a certain road signal is lower than cutting value, then returns step b;
Wherein, in above b, step c, the voice signal of other input channel is all in holddown; Cutting value is critical value.
After described step 5, there are following steps:
(aa). described processing unit receives each voice signal that described output channel (OCHn) exports, utilizing status device, attenuation module, gain module, tone color adjusting module and sound locating module process each voice signal, and described reproduction units is exported in the voice signal merging after process;
(bb). described reproduction units utilizes different power amplifiers to amplify each road voice signal, will amplify Hou Ge road transmission of sound signals in described speaker unit or described multistage dynamic speaker unit.
In described step aa, the treatment step of described processing unit to each road voice signal is as follows:
(aa-1). attenuation/gain is carried out to each road voice signal;
(aa-2). utilizing status Qi Duige road voice signal processes, and carries out acoustic image distribution;
(aa-3). carry out the multistage dynamic assignment of each road voice signal;
(aa-4). carry out attenuation/gain to the voice signal of each rank, the voice signal of utilizing status device to attenuation/gain processes;
(aa-5). merged by each road voice signal, the voice signal after utilizing status device is combined processes;
(aa-6). attenuation/gain is carried out to voice signal, exports the voice signal after carrying out attenuation/gain;
Wherein, effect device is internal effects device or the external effects device of real-time multi-stage Dynamic Signal current processing device.
In described step aa-3,
(aa-3a). certain one-level that one group of dynamic signal of list is assigned to dynamical output more than a certain group (OCHn) by user exports;
(aa-3b). Dynamic Signal more than of input processor group is assigned on the dynamical output more than a certain group (OCHn) of output by user;
(aa-3c). one group of list Dynamic Signal is Dynamic Signal more than a group (OCHn) according to signal magnitude Resurvey by user;
(aa-3d). user is merged into one group of list Dynamic Signal at Dynamic Signal more than a group, and certain one-level being assigned to dynamical output more than a certain group (OCHn) exports.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (8)
1. sound collection, process and a reproducting method, is characterized in that, described method comprises the steps:
(1). voice signal, after transducer, is assigned to each input channel (ICH1, ICH2, ICH3 by microphone signal distributor by voice signal ... ICHN);
(2). by each input channel (ICH1, ICH2, ICH3 ... ICHN) voice signal in carries out different stage and amplifies process;
(3). carry out analog-to-digital conversion by through amplifying the voice signal after process, and be transferred to each signal distributor (1,2,3 respectively ... n) in;
(4). described signal distributor (1,2,3 ... n) each voice signal is transferred to respectively deposit formula judgment means, stream signal real-time judge device and signal stream selector in;
(5). described in deposit formula judgment means, described stream signal real-time judge device and described signal stream selector and respectively each voice signal received processed;
In described step (2), different stage refers to the amplification multistage amplifying unit being carried out between 0db to 100db to different stage to voice signal, there is the difference in magnification level when every one-level is amplified.
2. method according to claim 1, it is characterized in that, in described step (2), the voice signal in input channel 1 (ICH1) carries out signal attenuation by PAD attenuating device, then carries out amplification process by corresponding multistage amplifying unit.
3. method according to claim 1, is characterized in that, in described step (5), described in deposit the treatment step of formula judgment means to voice signal as follows:
(A). signal distributor described in buffer memory (1,2,3 ... n) voice signal sent;
(B). successively distortion judgement is carried out to the voice signal stored in both the buffers, the voice signal of distortion is deleted from described buffer;
(C). from each distortionless voice signal, select a road from the nearest signal of 0dbfs, by this road Signal transmissions to memory.
4. method according to claim 1, is characterized in that, when the distortion carrying out voice signal judges, if Zhi Sheng mono-road voice signal, Ze Jianggai road transmission of sound signals is to memory.
5. method according to claim 1, is characterized in that, in described step (5), the treatment step of described stream signal real-time judge device to voice signal is as follows:
(a). successively to each road input channel (ICH1, ICH2, ICH3 ... whether the level of the voice signal ICHN) judges lower than cutting value;
(b). if the level of voice signal is lower than cutting value, then this voice signal is outputted to corresponding output channel (OCHn) by digital processing unit;
(c). if signal is higher than cutting value, and Ze Duigai road signal suppresses, and register starts to judge ICH
n+1road signal, until a certain road signal is lower than cutting value, then returns step (b);
Wherein, in above (b), (c) step, the voice signal of other input channel is all in holddown; Cutting value is critical value.
6. method according to claim 1, is characterized in that, after described step (5), there are following steps:
(aa). processing unit receives each voice signal that output channel (OCHn) exports, utilizing status device, attenuation module, gain module, tone color adjusting module and acoustic image locating module process each voice signal, and reproduction units is exported in the voice signal merging after process;
(bb). described reproduction units utilizes different power amplifiers to amplify each road voice signal, will amplify Hou Ge road transmission of sound signals in speaker unit or multistage dynamic speaker unit.
7. method according to claim 6, is characterized in that, in described step (aa), the treatment step of described processing unit to each road voice signal is as follows:
(aa ?1). attenuation/gain is carried out to each road voice signal;
(aa ?2). utilizing status Qi Duige road voice signal processes, and carries out acoustic image distribution;
(aa ?3). carry out the multistage dynamic assignment of each road voice signal;
(aa ?4). carry out attenuation/gain to the voice signal of each rank, the voice signal of utilizing status device to attenuation/gain processes;
(aa ?5). merged by each road voice signal, the voice signal after utilizing status device is combined processes;
(aa ?6). attenuation/gain is carried out to voice signal, exports the voice signal after carrying out attenuation/gain;
Wherein, effect device is internal effects device or the external effects device of real-time multi-stage Dynamic Signal current processing device.
8. method according to claim 7, is characterized in that, in described step (aa ?3),
(aa ?3a). one group of dynamic signal of list is assigned on a certain group of output channel (OCHn) by user;
(aa ?3b). Dynamic Signal more than of input processor group is assigned on a certain group of output channel (OCHn) of output by user;
(aa ?3c). one group of list Dynamic Signal is Dynamic Signal more than a group according to signal magnitude Resurvey by user;
(aa ?3d). user is merged into one group of list Dynamic Signal at Dynamic Signal more than a group, and is assigned on a certain group of output channel (OCHn).
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| CN105578349A (en) * | 2015-12-29 | 2016-05-11 | 太仓美宅姬娱乐传媒有限公司 | Sound collecting and processing method |
| CN105788617A (en) * | 2016-02-26 | 2016-07-20 | 太仓埃特奥数据科技有限公司 | Recording and sound processing method |
| CN107360495B (en) * | 2016-05-10 | 2020-01-24 | 环旭电子股份有限公司 | Method for reducing plugging noise of external microphone suitable for android system |
| CN109435837A (en) * | 2018-12-20 | 2019-03-08 | 云南玉溪汇龙科技有限公司 | A kind of engine of electric vehicle acoustic simulation synthesizer and method |
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| CN101005272A (en) * | 2006-01-20 | 2007-07-25 | 三星电子株式会社 | Multi-channel digital amplifier, signal processing method thereof, and audio reproducing system having the same |
| EP1995721A1 (en) * | 2005-02-14 | 2008-11-26 | Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V. | Parametric joint-coding of audio sources |
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| CN1452851A (en) * | 2000-04-19 | 2003-10-29 | 音响方案公司 | Multi-channel surround sound mastering and reproduction techniques that preserve spatial harmonics in three dimensions |
| US7076071B2 (en) * | 2000-06-12 | 2006-07-11 | Robert A. Katz | Process for enhancing the existing ambience, imaging, depth, clarity and spaciousness of sound recordings |
| EP1995721A1 (en) * | 2005-02-14 | 2008-11-26 | Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V. | Parametric joint-coding of audio sources |
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