EP2473996A1 - Procédé pour rendre un signal musical compatible avec un codec à transmission discontinue; et dispositif pour la mise en oeuvre de ce procédé - Google Patents
Procédé pour rendre un signal musical compatible avec un codec à transmission discontinue; et dispositif pour la mise en oeuvre de ce procédéInfo
- Publication number
- EP2473996A1 EP2473996A1 EP10734994A EP10734994A EP2473996A1 EP 2473996 A1 EP2473996 A1 EP 2473996A1 EP 10734994 A EP10734994 A EP 10734994A EP 10734994 A EP10734994 A EP 10734994A EP 2473996 A1 EP2473996 A1 EP 2473996A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- silence
- period
- initial
- musical
- 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
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/26—Pre-filtering or post-filtering
- G10L19/265—Pre-filtering, e.g. high frequency emphasis prior to encoding
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
- G10H2210/031—Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an encoded audio signal
- G10H2210/046—Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an encoded audio signal for differentiation between music and non-music signals, based on the identification of musical parameters, e.g. based on tempo detection
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/012—Comfort noise or silence coding
-
- 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
- G10L25/78—Detection of presence or absence of voice signals
- G10L2025/783—Detection of presence or absence of voice signals based on threshold decision
-
- 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
- G10L25/78—Detection of presence or absence of voice signals
- G10L25/81—Detection of presence or absence of voice signals for discriminating voice from music
Definitions
- a method for rendering a musical signal compatible with a discontinuous transmission coded and device for implementing this method
- the invention relates to a method for making a musical signal compatible with a discontinuous transmission coded as found in telecommunication networks, in particular networks using the Internet protocol.
- a particular function of a codec is to convert an audio signal into a digital signal.
- Some codecs are said to be discontinuously transmitted because they include a voice activity detector that detects periods of silence and prevents coding of the audio signal during these periods of silence. This avoids the use of resources to transmit data which in fact represent only a background noise. More precisely, a brief indication of silence is transmitted which commands, in the remote decoder, the production of an artificial noise, for the comfort of the listener.
- the musical signal is interrupted each time a drop in amplitude is interpreted as a silence by the voice activity detection circuit.
- Such a codec is therefore incompatible with the transmission of a musical signal. This is very annoying if you want to transmit music during an advertisement, or while a user is on hold, for example.
- a known solution is to control the codec from the application that must produce a musical signal, so as to inhibit the detection of silent periods while this application sends the coded musical signal.
- this solution is only applicable if the application that produces the musical signal can send such a control signal to the codec. This is not possible if the codec is remote.
- the object of the invention is to make a musical signal compatible with a discontinuous transmission codec, even if the application which produces this signal is not able to inhibit in this codec the detection of the periods of silence while this application sends the coded a musical signal.
- the object of the invention is a method for rendering a musical signal compatible with a discontinuous transmission codec, comprising the steps of:
- the method thus characterized renders a musical signal compatible with a discontinuous transmission codec because the final signal is always of sufficient amplitude not to be detectable as silence, by a discontinuous transmission coded.
- the invention also relates to a device for making a musical signal compatible with a discontinuous transmission coded, which comprises means for implementing the method according to the invention.
- FIG. 1 represents graphs which illustrate a first variant of the method according to the invention.
- FIG. 2 represents graphs which illustrate a second variant of the method according to the invention.
- FIG. 3 represents graphs which illustrate a third variant of the method according to the invention.
- FIG. 4 represents an exemplary embodiment of the device according to the invention.
- Figure 1 shows:
- the final signal SF1 is obtained by replacing the initial signal IF (background noise) by the auxiliary signal SA1 which is preferably a sinusoidal signal of predetermined amplitude, which is small relative to the amplitude of the signal initial SI, and fixed frequency, equal to 2100 Hz plus or minus 15 Hz (Signal conventionally used to block an echo canceller). In another example, the frequency used is 2093 Hz and corresponds to the music note Ml in the seventh octave.
- the auxiliary signal SA1 is produced by conventional means, for example a signal processor executing a conventional program.
- the final signal SF2 is obtained by replacing the initial signal IF (background noise) with the auxiliary signal SA2 which is preferably a low amplitude sinusoidal signal with respect to the initial signal IF, and of variable frequency , equal to 1 / T where T is the period of the fundamental frequency of the initial signal SI just before the silence period S.
- This frequency is conventionally determined by a signal processor, by means of a Fourier transform. Then this processor produces a sinusoidal signal at this frequency, by executing a classical program.
- This auxiliary signal SA2 replaces the initial signal SI during periods of silence.
- the auxiliary signal is a periodic signal, but not sinusoidal, which is the sum of several sinusoidal signals, each having a small amplitude with respect to the initial signal SI, and frequencies respectively equal to multiples of 1 / T:
- the final signal SF3 is obtained by replacing the initial signal IF (background noise) with an auxiliary signal which is preferably equal to the initial signal IF, just before the silence period S, but with a magnitude very reduced.
- this auxiliary signal is determined by recording the initial signal SI in a sliding time window, and by extracting from this recording a musical signal period AB, located just before the silence period S.
- the period AB of musical signal is determined in the recording just before the silence period S, by detecting two successive zero crossings, in a conventional manner, by a signal processor. Then this processor reads the recording of the period AB repeatedly, and restores it with a reduced amplitude, to fill the entire period of silence S.
- the auxiliary signal SA3 is obtained by passing the initial signal IF through a conventional reverberation circuit, the reverberation time being chosen greater than the maximum duration of the periods of silence.
- This auxiliary signal SA3 replaces the initial signal SI during periods of silence.
- the auxiliary signal has a lower amplitude than that of the initial signal SI, outside periods of silence, but sufficient to not be detectable as silence, by a discontinuous transmission coded.
- the relative level of the auxiliary signal is, for example, -31 dB.
- FIG. 4 is a functional representation of an exemplary embodiment DCOMP of the device according to the invention, which comprises:
- a switching device C having a first and a second input, an output, and a control input
- the initial signal SI is applied to an input of the DPS device for detecting a period of silence, to an input of the DPA slide for producing an auxiliary signal, and to the first switching device input C.
- An output of the DPS device for detecting a silence period is connected to the control input of the switching device C.
- An output of the output DPA slide of an auxiliary signal is connected to the second input of the DPS device for detecting a period of time. silence.
- the output of the switching device C constitutes the output which provides a final signal SF.
- the silence period detection device DPS When the silence period detection device DPS detects a silence period, it controls the switching device C so that it transmits the auxiliary signal to the output of the DCOMP device for the duration of the silence period.
- DPS and DPA devices may be embodied as a signal processor with a program, or in the form of wired circuits.
- the DPA device for producing an auxiliary signal comprises means for implementing one of the variants of the method according to the invention, described above.
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Telephone Function (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0955963A FR2949582B1 (fr) | 2009-09-02 | 2009-09-02 | Procede pour rendre un signal musical compatible avec un codec a transmission discontinue ; et dispositif pour la mise en ?uvre de ce procede |
| PCT/EP2010/060455 WO2011026685A1 (fr) | 2009-09-02 | 2010-07-20 | Procede pour rendre un signal musical compatible avec un codec a transmission discontinue; et dispositif pour la mise en oeuvre de ce procede |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2473996A1 true EP2473996A1 (fr) | 2012-07-11 |
| EP2473996B1 EP2473996B1 (fr) | 2014-10-22 |
Family
ID=42045385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10734994.6A Not-in-force EP2473996B1 (fr) | 2009-09-02 | 2010-07-20 | Procédé pour rendre un signal musical compatible avec un codec à transmission discontinue; et dispositif pour la mise en oeuvre de ce procédé |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US9251801B2 (fr) |
| EP (1) | EP2473996B1 (fr) |
| JP (1) | JP5384741B2 (fr) |
| KR (1) | KR101347506B1 (fr) |
| CN (1) | CN102640214B (fr) |
| BR (1) | BR112012004769A2 (fr) |
| ES (1) | ES2526125T3 (fr) |
| FR (1) | FR2949582B1 (fr) |
| TW (1) | TWI497486B (fr) |
| WO (1) | WO2011026685A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9065576B2 (en) | 2012-04-18 | 2015-06-23 | 2236008 Ontario Inc. | System, apparatus and method for transmitting continuous audio data |
| US9479887B2 (en) * | 2012-09-19 | 2016-10-25 | Nokia Technologies Oy | Method and apparatus for pruning audio based on multi-sensor analysis |
| TWI476679B (zh) * | 2012-11-21 | 2015-03-11 | C Media Electronics Inc | 虛擬訊號源產生裝置及其方法 |
| US10225290B2 (en) * | 2016-07-15 | 2019-03-05 | Genband Us Llc | Systems and methods for extending DSP capability of existing computing devices |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633841B1 (en) * | 1999-07-29 | 2003-10-14 | Mindspeed Technologies, Inc. | Voice activity detection speech coding to accommodate music signals |
| JP3912389B2 (ja) * | 2004-03-24 | 2007-05-09 | ソニー株式会社 | ディジタル信号処理装置及びディジタル信号処理方法 |
| US7171245B2 (en) * | 2004-05-06 | 2007-01-30 | Chunghwa Telecom Co., Ltd. | Method for eliminating musical tone from becoming wind shear sound |
| US8682652B2 (en) * | 2006-06-30 | 2014-03-25 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic |
| MX2008016163A (es) * | 2006-06-30 | 2009-02-04 | Fraunhofer Ges Forschung | Codificador de audio, decodificador de audio y procesador de audio con caracteristicas de warping variable de manera dinamica. |
| FI20060666A0 (fi) | 2006-07-07 | 2006-07-07 | Nokia Corp | Menetelmä ja järjestelmä epäjatkuvan lähetyksen toiminnallisuuden parantamiseksi |
| PL3848928T3 (pl) * | 2006-10-25 | 2023-07-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Urządzenie i sposób do generowania wartości podpasm audio o wartościach zespolonych |
| JP2008176110A (ja) * | 2007-01-19 | 2008-07-31 | Sanyo Electric Co Ltd | オーディオ信号処理装置及びオーディオ信号処理方法 |
| US9653088B2 (en) * | 2007-06-13 | 2017-05-16 | Qualcomm Incorporated | Systems, methods, and apparatus for signal encoding using pitch-regularizing and non-pitch-regularizing coding |
| WO2009104402A1 (fr) * | 2008-02-22 | 2009-08-27 | パナソニック株式会社 | Dispositif de lecture de musique, procédé de lecture de musique, programme de lecture de musique et circuit intégré |
-
2009
- 2009-09-02 FR FR0955963A patent/FR2949582B1/fr not_active Expired - Fee Related
-
2010
- 2010-07-19 TW TW099123655A patent/TWI497486B/zh not_active IP Right Cessation
- 2010-07-20 CN CN2010800390337A patent/CN102640214B/zh active Active
- 2010-07-20 KR KR1020127005406A patent/KR101347506B1/ko not_active Expired - Fee Related
- 2010-07-20 EP EP10734994.6A patent/EP2473996B1/fr not_active Not-in-force
- 2010-07-20 JP JP2012527258A patent/JP5384741B2/ja not_active Expired - Fee Related
- 2010-07-20 ES ES10734994.6T patent/ES2526125T3/es active Active
- 2010-07-20 WO PCT/EP2010/060455 patent/WO2011026685A1/fr not_active Ceased
- 2010-07-20 BR BR112012004769A patent/BR112012004769A2/pt not_active IP Right Cessation
- 2010-07-20 US US13/389,170 patent/US9251801B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011026685A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2949582A1 (fr) | 2011-03-04 |
| FR2949582B1 (fr) | 2011-08-26 |
| KR101347506B1 (ko) | 2014-01-02 |
| JP5384741B2 (ja) | 2014-01-08 |
| CN102640214A (zh) | 2012-08-15 |
| ES2526125T3 (es) | 2015-01-07 |
| KR20120043038A (ko) | 2012-05-03 |
| TWI497486B (zh) | 2015-08-21 |
| WO2011026685A1 (fr) | 2011-03-10 |
| US9251801B2 (en) | 2016-02-02 |
| TW201129971A (en) | 2011-09-01 |
| JP2013504083A (ja) | 2013-02-04 |
| BR112012004769A2 (pt) | 2019-09-24 |
| EP2473996B1 (fr) | 2014-10-22 |
| CN102640214B (zh) | 2013-08-28 |
| US20120158164A1 (en) | 2012-06-21 |
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