EP2321982A1 - Verfahren zur mehrkanalbearbeitung in einem mehrkanaltonsystem - Google Patents
Verfahren zur mehrkanalbearbeitung in einem mehrkanaltonsystemInfo
- Publication number
- EP2321982A1 EP2321982A1 EP08875130A EP08875130A EP2321982A1 EP 2321982 A1 EP2321982 A1 EP 2321982A1 EP 08875130 A EP08875130 A EP 08875130A EP 08875130 A EP08875130 A EP 08875130A EP 2321982 A1 EP2321982 A1 EP 2321982A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- value
- output level
- channels
- level value
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
Definitions
- the invention relates to a method for multichannel processing in a multi-channel sound system, in particular in surround multi-channel sound technology, with the following method steps:
- encoding encoding
- a first step in the conventional multichannel processing process in the area of audio material upmixing from stereo / mono to surround of any configuration is splitting a channel or channel mix into individual channels. This splitting can be realized by appropriate software. After splitting, the individual channels are available for further processing, in particular to ensure the stability of the multichannel mix in comparison to the original eg stereo mix by means of a multi-channel compression / timing.
- a compressor / limiter is provided.
- a Compressor / Limiter is a limiter that prevents exceeding a peak level to prevent oversteer. They are also to be understood as volume / loudness regulators of instrument groups / vocals or speech.
- Each individual channel or channel groups is / are assigned a compressor / limiter.
- the values of the Channel Fader, Threshold, Attack (if present), Release, and Output Level parameters within a compressor and / or limiter one adjusts the ratio of the individual channels to each other.
- the result of this regulation is that the volume / loudness balance of the individual channels is stabilized to each other before encoding.
- the channel fader volume is used to regulate the volume of each individual channel in a mixing console, which is an important component in a recording studio.
- the normal sound level of a channel fader is 0 dB.
- the signal originally present at the single channel will sound as it was originally flattened, assuming a correctly measured and neutral set gain on the corresponding channel strip.
- the channel gain controls the preamplification of a signal before it passes the channel fader.
- the threshold value acts like a threshold of the signal present at the channel fader.
- a compressor / limiter works in such a way that the compressor / limiter limits the signal as soon as the applied signal exceeds the threshold value.
- the release value tells you the amount of time it takes the compressor / limiter to reset to zero after the applied signal drops below the threshold.
- the attack value determines the reaction time when the threshold value is exceeded.
- the output level indicates how strong the signal present on the channel is after being processed by the compressor / limiter.
- the output leveler is sort of a signal amplifier.
- the matrix surround technology meets all requirements for a usable compatible surround system.
- the object of the present invention is therefore to develop a method of the type mentioned in the introduction. that the Lt, Rt encoded surround mixes not only act as data carriers of the mixes to be decoded, but also exist in isolation from stereo and mono, and can improve their quality as needed by processing through the invented method.
- the channel faders are set to a uniform value and in method step c) at least two channels are limited with a uniform output level value, whereby a channel C (center) in the output level value can vary and each further channel is limited in such a way that it produces an output Leven, which is at least one decibel lower than the uniform output level value of the two channels, wherein subsequent to step d) further compression and / or limitation of the encoded channels by setting a value of at least one of the parameters channel fader, Threshold, Release and output level.
- individual channels preferably 5 individual channels
- the sixth channel within a 5.1 system would then, for example, receive a higher channel fader value depending on the audio material to be processed. This value is preferably between 0.1 to 5 db.
- This basic setting can then be maintained within the scope of the invention either over the entire processing or manually changed. This would apply to all six channels (example of a 5.1 configuration).
- the signals are then forwarded to limit in step c).
- At least two channels with a uniform output level value can be limited with the same setting of the threshold and release, wherein a channel is set freely within certain thresholds both in the threshold and in the output level, depending on the audio material to be processed ,
- the invention is based on the recognition that the splitting on individual channels is accompanied by an uncontrolled splitting of the energy, which in turn has an effect on the volume / loudness constellation, as well as the phase position within the mix. If one splits a finished stereo mix, which has been harmoniously tuned on the channels FL and FR and has been optimized in volume and loudness, then this has the consequence that the original balance is sustainably destroyed. Neither the balance, the phase position nor the volume / loudness constellation within the mix are retained. The splitting of energy thus results in the weakening of the individual channels.
- the basic idea of the invention is now to set the balance between the individual channels by limiting them so that the original style mix is restored, or improved in sound and expression.
- the phase position within the surround mix is stabilized according to the invention even before the encoding by the constellation of the channel faders (step b)) and limitation.
- the optimal loudness is achieved by a further limitation subsequent to method step d) by setting a value of at least one of the parameters channel fader, threshold, release and output level.
- the first limitation known from the prior art and manifested in method step c) is generally used in the surround region in order to maintain as high a volume as possible in the mix. she however, does not serve for the stabilization of the split channels according to the invention.
- a further idea of the invention is that, contrary to the prevailing view, following step d), a further limitation of the individual channels takes place. Since encoded surround mixes are poor compared to stereo and monomixes, they are a fluency program. B. less suitable for broadcasting and TV, since the encoded mix with stereo and monomixes competes here.
- the invention therefore provides, after the encoding, to turn on a limiter in the form of a maximizer in order to optimize the loudness, ie the energy of the mix, as well as the sound image.
- the result is surroundecoded mixes that are absolutely equivalent in stereo and monocontent. This limitation also preserves the energy of a stereo or mono mix, producing a sound that matches or enhances that of a stereo guitar.
- an advantage of the invention is that the surroundecoded mix is more phase stable
- stereo encoded mixes after being processed by the invented method, sound much better than the previously known stereo.
- This method also includes the consumer's listening room, so that the stereo mixes encoded in this way sound more transparent, multi-dimensional and more intense.
- this method also makes it possible to process stereo mixes already encoded in a matrix surround process of any kind in such a way that they too are converted into the new stability and sound quality in any audio configuration.
- Another area of application is the conversion of existing, created for a digital surround process single channels in the new result. For example, Dolby Digital and dts production for consumer audio without the need for digital decoding equipment - with full stereo and mono compatibility.
- the output level value of channel C is freely adjusted according to the audio material to be processed.
- the output level value of this channel to the channels FR and FL differs by +1 - +6 db
- in process step c) additionally a uniform output level value the channels Ls, Rs, Bl, Br 1 LFE is set.
- a multi-band compressor per channel By the optional use of a multi-band compressor per channel can be taken within the scope of the invention still influence on the frequencies of a mix. By emphasizing or lessening a corresponding frequency range, one can specifically repeat the lost frequencies which have arisen during the change of the sound image during the decoding from, for example, 2 to 6 channels. This effect is therefore equivalent to that of an equalizer, which can also be used as an alternative to the multi-band compressor. Likewise, it may be advantageous, with appropriate starting material, to carry out a decompression per single channel in method step b). The invention has come to the realization that a decompression per single channel after splitting provides a higher-quality result than the previously often used decompression of the split-up sum before method step a).
- a decompressor is a compressor, which is equipped with the parameters Threshold, Attack, Release, Ratio and Output Level.
- Threshold, Attack, Release, Ratio and Output Level The setting of a Ratio value below the value 1.00, as well as long Attack and Release values can lead to more dynamic results with the corresponding source material, which was inherently too hard or uncomfortably mastered by Brickwall compression.
- a threshold and output level setting adapted to the source material is required.
- the invention provides the use of the method for a recording medium, a sound carrier, a digital data set and a conversion automation of conventional audio formats to the new sound possibilities.
- This can be built into audio / video equipment, or run as stand-alone hardware or software, as well as implemented in software and hardware-based host applications.
- the channel faders control the volume of each channel.
- the normal sound level of a fader is 0 dB.
- the channel fader is set to 0 dB, so that the signal present at the channel will sound as it was originally leveled out, assuming a correctly adjusted and neutral set gain value. After this configuration, the signals are sent to the channel faders with limiters
- Each channel fader of the 6 channels with limiter has a setting of +8.3 db.
- Each of the 6 limiters has a "Threshold" value of -3.3 db.
- the "Threshold” value shows the threshold value of the signal present at the channel fader, from which the limiter begins to work.
- a limiter works by limiting the signal as soon as the signal exceeds the threshold value. Unlike a compressor, however, this is rather simplistic because it reacts immediately, while a compressor has several deficient individual settings, how exactly should be compressed. The limiter has more of the characteristics of a signal compression.
- Threshold value on channel C may vary in the threshold value depending on the audio being edited.
- Each Limiter has a “Release” value of 1.00
- the “Release” value indicates how long the Limiter needs to return to the zero position after the applied signal has fallen below the Threshold value again. If a signal exceeds the Threshold limit, the limiter limits the level. If the signal drops again, there are several ways to select the "Release” value.
- the "Output Level" value indicates the strength of the signal applied to the channel after being processed by the limiter, which is basically a normal signal amplifier / limiter, the advantage of this value being that a fixed configuration can be found it allows - in later stereo / mono but also in all surround formats - to find the right ratios of the volumes again.
- the "Output Level" value of channel C may vary, depending on the audio material to be processed This configuration stabilizes the mix again
- the basically very low output level values are due to the fact that the mix recharges itself enormously in terms of energy, because in the Encoding Pro 6 again become 2 channels (Lt, Rt). The potentiation of energy is thus the result.
- there is a strong overload in the encoding with the result that the mix is destroyed.
- Audio material usually by compression / limitation louder, but at the same time less dynamic, this closes in here treated procedures, but one can gain both dynamics and loudness.
- This method can also be applied to fully produced single tracks of a discrete track to form an Lt 1 Rt track.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Acoustics & Sound (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- General Physics & Mathematics (AREA)
- Algebra (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008036924A DE102008036924B4 (de) | 2008-08-08 | 2008-08-08 | Verfahren zur Mehrkanalbearbeitung in einem Mehrkanaltonsystem |
| PCT/EP2008/011128 WO2010015275A1 (de) | 2008-08-08 | 2008-12-29 | Verfahren zur mehrkanalbearbeitung in einem mehrkanaltonsystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2321982A1 true EP2321982A1 (de) | 2011-05-18 |
| EP2321982B1 EP2321982B1 (de) | 2015-06-03 |
Family
ID=40512428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08875130.0A Active EP2321982B1 (de) | 2008-08-08 | 2008-12-29 | Verfahren zur mehrkanalbearbeitung in einem mehrkanaltonsystem |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8755530B2 (de) |
| EP (1) | EP2321982B1 (de) |
| JP (1) | JP5917145B2 (de) |
| KR (1) | KR101571197B1 (de) |
| DE (1) | DE102008036924B4 (de) |
| DK (1) | DK2321982T3 (de) |
| WO (1) | WO2010015275A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013102799A1 (en) * | 2012-01-06 | 2013-07-11 | Sony Ericsson Mobile Communications Ab | Smart automatic audio recording leveler |
| JP6056356B2 (ja) | 2012-10-10 | 2017-01-11 | ティアック株式会社 | 録音装置 |
| JP6079119B2 (ja) | 2012-10-10 | 2017-02-15 | ティアック株式会社 | 録音装置 |
| WO2014117867A1 (de) | 2013-02-04 | 2014-08-07 | Kronoton Gmbh | Verfahren zur mehrkanaltonbearbeitung in einem mehrkanaltonsystem |
| US9380383B2 (en) | 2013-09-06 | 2016-06-28 | Gracenote, Inc. | Modifying playback of content using pre-processed profile information |
| US9820073B1 (en) | 2017-05-10 | 2017-11-14 | Tls Corp. | Extracting a common signal from multiple audio signals |
| KR102504081B1 (ko) * | 2022-08-18 | 2023-02-28 | 주식회사 킨트 | 사운드 파일 마스터링 시스템 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04132499A (ja) * | 1990-09-25 | 1992-05-06 | Matsushita Electric Ind Co Ltd | 音像制御装置 |
| JP3991372B2 (ja) * | 1995-08-30 | 2007-10-17 | 日本ビクター株式会社 | デジタル信号処理装置 |
| JP3788537B2 (ja) * | 1997-01-20 | 2006-06-21 | 松下電器産業株式会社 | 音響処理回路 |
| JPH11113098A (ja) * | 1997-10-03 | 1999-04-23 | Victor Co Of Japan Ltd | マルチチャンネル音声信号の2チャンネルエンコード処理装置 |
| US6931370B1 (en) * | 1999-11-02 | 2005-08-16 | Digital Theater Systems, Inc. | System and method for providing interactive audio in a multi-channel audio environment |
| JP2001275195A (ja) * | 2000-03-24 | 2001-10-05 | Onkyo Corp | エンコード・デコードシステム |
| JP2002175097A (ja) * | 2000-12-06 | 2002-06-21 | Yamaha Corp | 音声信号のエンコード/圧縮装置およびデコード/伸長装置 |
| JP2003009297A (ja) * | 2001-06-21 | 2003-01-10 | Kenwood Corp | 信号処理回路および信号処理方法 |
| 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 |
| US7551745B2 (en) * | 2003-04-24 | 2009-06-23 | Dolby Laboratories Licensing Corporation | Volume and compression control in movie theaters |
| US7639823B2 (en) * | 2004-03-03 | 2009-12-29 | Agere Systems Inc. | Audio mixing using magnitude equalization |
| US20060106620A1 (en) * | 2004-10-28 | 2006-05-18 | Thompson Jeffrey K | Audio spatial environment down-mixer |
| JP4186228B2 (ja) * | 2005-03-17 | 2008-11-26 | ヤマハ株式会社 | 音響調整卓 |
| US8073160B1 (en) * | 2008-07-18 | 2011-12-06 | Adobe Systems Incorporated | Adjusting audio properties and controls of an audio mixer |
-
2008
- 2008-08-08 DE DE102008036924A patent/DE102008036924B4/de active Active
- 2008-12-29 KR KR1020117005511A patent/KR101571197B1/ko active Active
- 2008-12-29 US US12/737,692 patent/US8755530B2/en active Active - Reinstated
- 2008-12-29 DK DK08875130.0T patent/DK2321982T3/en active
- 2008-12-29 WO PCT/EP2008/011128 patent/WO2010015275A1/de not_active Ceased
- 2008-12-29 EP EP08875130.0A patent/EP2321982B1/de active Active
- 2008-12-29 JP JP2011521440A patent/JP5917145B2/ja active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010015275A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US8755530B2 (en) | 2014-06-17 |
| KR101571197B1 (ko) | 2015-11-23 |
| JP5917145B2 (ja) | 2016-05-11 |
| KR20110058801A (ko) | 2011-06-01 |
| DE102008036924B4 (de) | 2011-04-21 |
| JP2011530843A (ja) | 2011-12-22 |
| WO2010015275A1 (de) | 2010-02-11 |
| DE102008036924A1 (de) | 2010-02-11 |
| DK2321982T3 (en) | 2015-09-07 |
| US20110129091A1 (en) | 2011-06-02 |
| EP2321982B1 (de) | 2015-06-03 |
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