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WO2009090281A1 - Method of converting 5.1 sound format to hybrid binaural format - Google Patents

Method of converting 5.1 sound format to hybrid binaural format

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Publication number
WO2009090281A1
WO2009090281A1 PCT/ES2008/070246 ES2008070246W WO2009090281A1 WO 2009090281 A1 WO2009090281 A1 WO 2009090281A1 ES 2008070246 W ES2008070246 W ES 2008070246W WO 2009090281 A1 WO2009090281 A1 WO 2009090281A1
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WO
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Patent type
Prior art keywords
channels
sound
format
fl
fr
Prior art date
Application number
PCT/ES2008/070246
Other languages
Spanish (es)
French (fr)
Inventor
Arrondo Ivan Portas
Original Assignee
Auralia Emotive Media Systems, S,L.
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.)
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS
    • H04S3/00Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels, e.g. Dolby Digital, Digital Theatre Systems [DTS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS
    • H04S2400/00Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved

Abstract

Method of converting 5.1 sound format to hybrid binaural format, comprising obtaining the signals from the FL, FR, C, SL, SR and LFE channels in 5.1 format which it is desired to convert into hybrid binaural format; auralizing the FL, FR, SL and SR channels in the following positions: FL: elevation from 0° to 30°, azimuth from -10° to -30°; FR: elevation from 0° to 30°, azimuth from +10° to +30°; SL: elevation from 175° to 195°, azimuth from -30° to -60°; SR: elevation from 175° to 195°, azimuth from +30° to +60°, thus obtaining the signals FL1, FR1, SL1 and SR1; modelling the response from the enclosure on the basis of the signals, introducing a reverberation effect; and mixing the signals FL2, FR2, SL2 and SR2 obtained in the previous step with the original LFE and C signals to obtain the two left and right output signals.

Description

FORMAT CONVERSION PROCEDURE 5.1 ​​SONORO

Binaural HYBRID

DESCRIPTION N

OBJECT OF THE INVENTION

The main object of the present invention is a process for converting sound into sound 5.1 format, commonly used for recording and reproducing digital sound movie content, in binaural format hybrid.

BACKGROUND OF THE INVENTION

Currently, the 5.1 format is the standard for the reproduction of sound domestic cinema. A sound system in the 5.1 format is composed of six audio channels where signals of music, voice, sound effects mixed in different proportions, etc. Each of the channels corresponds to a speaker, and in turn each of the speakers should be placed at a particular location relative to the user for optimal sound sensation.

The main speakers (FL and FR in Figure 1) form an equilateral triangle ideally with the position of the user (O). In addition, the straight lines formed by the surround speakers (SL and SR) and the user (O) form an angle of approximately 110 ° about the vertical axis (line connecting O and C). Speaker LFE (Low Frequency Enhancement, its acronym in English), aims to enhance bass sounds to produce a striking effect on the reproduction. Its location is not decisive, since the information transmitted has a spectrum of frequencies generally lower than 100 Hz, which has an omnidirectional nature. That is, you can not determine where the sound is coming.

A drawback of audio systems based on 5.1 sound format is that the user feel deteriorates rapidly when it is not located in the optimum location with respect to the speakers. Using headphones allows, however, optimal placement of the user at all times, since sound reproduction systems, being attached to the head of the user, do not change their position relative to your head.

However, the human is a volumetric sound receiver, ie processes sound that reaches it through, for example, reflections created by the shoulders and torso, or diffractions created by the sound to surround the head. Human hearing is binaural nature, wherein the result of the whole process of sound reception ends in only two channels: the right ear and left ear. The term "binaural" refers to the nature of human hearing Ia because people are able to capture all the spatial sound information through a single pair of ears.

When no one considers this phenomenology is usually produced the so-called "intracranial sound", such as traditional stereo sound when listening through headphones. Intracranial sound consists of the feeling that the sound sources are inside the skull of the user, at a point between the two headphones, for which reason the traditional stereo sound is not a recommended format when you try to represent so realistic three-dimensional sound spaces.

There are essentially two ways to achieve binaural reproduction:

The first is to replace the pair of specific receptors that is typically used for volumetric receivers, as dummies, thereby achieving the sound that reaches them is processed naturally. Thus a binaural stereo recording, where all phenomenology Ia described above is achieved is already entered.

The second is based on performing a procedure auralization. For this, usually measured or model the response of a given receptor (a dummy or a human, for example) to a pulse signal from a given point in space (typically a broadband noise emitted from a point around user). US 2007213990 discloses a method for transforming a traditional stereo signal into a binaural signal bacanal, focusing on the treatment must suffer the input signal ahead of their preparation to be transformed into three-dimensional sound. Specifically, it describes how to divide the input signal according to different frequency bands, once the input signal divided auralizar each subband and finally joining them to form the two output channels in binaural format.

DESCRIPTION OF THE INVENTION

The present invention describes a new process for the auralization real-time audio in 5.1 format. For optimal results, each channel is treated and auralizado independently, so that you can assign specific acoustic parameters to each order to make more realistic and spectacular the reproduction.

The most important advantages of the method of the invention can be summarized as follows:

optimal reproduction in all cases, since, being attached to the user headphones, the relative position between the reproduction system and the user does not vary is achieved.

The hybrid model described, which combines the auralization of FL, FR, SL and SR channels with the original monophonic channels C and LFE allows greater intelligibility of the dialogue, the absence of interference between the front channels and the channel C, and an immersion superior because unconscious Ia constant referencing the brain makes between the monaural channel C and auralizados channels.

Readjusting the proportions of the different types of information, through the separation of sources and later remixed, from the beginning to optimize the content of the different channels to achieve optimal results.

The specific virtual placement of FL and FR channel and modeling the specific compound, allow a perfect balance with the dialogue channel C, not interfering with their intelligibility and infusing Ia depth just the frontal plane.

The specific virtual placement of the SL and SR channels and modeling a different specific grounds for the channels of the front and rear planes, bring a sense of striking back depth, providing the system with differentiated levels of sound reproduction, creating thus a highly immersive experience.

Strengthening the LFE channel recreates the sensations produced by the major components in cinemas, balancing the playback system.

Herein, the term "auralizar" refers to the processing of different channels for the user having the printing of which come from parts of concrete space and achieving an optimized spectacularity and intelligibility.

Similarly, the term "channel" refers to the signal of each of the speakers that make the sound format 5.1 or hybrid format binaural sound. So, we will discuss the channels FL, FR, C, SL, SR or LFE, which are input channels in the 5.1 format and the L and R channels are output channels in binaural format. the letters "L" will be used and "R" to distinguish between the channel positions situated Ia left (left,) and right (right in English) of the user. the terms "front plane" and will also be used "flat back" to refer to the position of the channel towards the user or behind the user and "right side up" or "left lateral plane" to refer to the position channels on the sides of the user.

Furthermore, the term "source" refers to a signal containing only sounds of a physical process, that is, the sources will in general music, voice and effects.

the term "binaural hybrid" is also defined as an audio format that mixes auralizados channels with no auralizados or monophonic channels. Specifically, the present invention mixes auralizados channels FL, FR, SL and SR with non auralizados C and LFE channels.

According to one aspect of the present invention, a method of converting sound 5.1 format described hybrid binaural, characterized in that it comprises the following operations:

1) Obtain the channel signals FL, FR, C, SL, SR and LFE of 5.1 format to be converted into binaural format hybrid. The information contained in these signals is usually a mixture of several sources, where:

FL: contains primarily music, and less voice and effects.

FR: it contains primarily music, and less voice and effects. C contains mainly voice, and to a lesser extent music and effects. SL: it contains mainly effects, and less music. SR: it contains mainly effects, and less music. LFE: contains only serious.

2) Auralizar channels FL, FR, SL and SR in the following positions: FL: elevation of 0 or 30 °; Azimuth -10 or -30 °.

FR: elevation of 0 or 30 °; Azimuth +10 to + 30 °.

SL: elevation of 175 ° to 195 °; Azimuth -30 ° to -60 °. SR: elevation of 175 ° to 195 °; Azimuth + 30 ° to + 60 °.

obtaining as result the FLi, FRi, SLi and SRi signals.

Say that "auralizar" a channel at a given position means virtually locate the channel so that the reproduction of the resulting signals, one for the right channel and one for the left channel via headphones produce Ia feeling in the user the sounds of that channel come from that particular position in space.

In other words, auralizar is a process by which a channel lacking usually monophonic spatial information, as in this case, ie anechoic or dry, is processed by a procedure called convolution with Ia impulse response (response time and frequency to a given acoustic stimulus from a given point in space) of a particular listener.

However, due to the physical differences between different users (size, distance between the ears, etc.), not all of them respond equally to new FLI fri, SLi and SRi channels.

For the response of each type of user, it is modeled or measured the response of a given receptor (a dummy or a human being for example) to a pulse signal from a given point in space (usually broadband noise emitted from a point around the user). This impulse response of the user is later used to process a monophonic source (without spatial information) through a convolution process, thus achieving the effect of listening to that source located at the point where the momentum has been issued.

The inventors have discovered that virtually placing the channels FL, FR, SL and SR within the angular ranges described above provides all users enhanced sensitivity spectacularity.

The reason that the angular ranges of the front speakers (FL and FR) are not too large is to avoid the loss of intelligibility channel dialogues (C) because of an image over stereo Ia music, ie that the energy of FL channel go almost entirely to L and the energy of FR go almost entirely to R, and avoid Ia arrival of a lot of energy to the side planes, near the ears which interfere with the localization of the channels backplane (SL and SR).

The dialogue channel (C) is not processed in the operation for processing the signals of the channels FL, FR, SL and SR as keep source provides two major advantages to the outlet end of the procedure.

The first one is to win in intelligibility regarding the input format, and that by keeping this intact and auralizar those of the front and rear (SL and SR) planes (FL and FR) channel dialogues (C) are featured in Ia central position, reducing ear fatigue Ia for follow up.

The second advantage lies in the fact constitute a point of reference for the auditory brain as they keep their intracranial nature makes it ideal combination with auralizados channels. Thus, the brain constantly compares the position of this channel with auralizados, Ia making the listening experience much more spectacular user.

The LFE channel is not processed in this step of the process because no directional nature Ia frequencies containing, ie Ia gives feeling of being heard in all positions. This feature makes the speakers intended for the reproduction of this channel can be located virtually anywhere in the room.

3) Modeling responses independent enclosure for the front and rear planes.

and channels the frontal plane (FLI, FRI) back (SU, SRi) independently impulse responses using two different optimized enclosures are processed. The processed separately from the front and rear channels provides the advantage of using two different virtual campuses, providing greater depth only to the rear channels, which are those with more spectacular effects. Excessive depth in the front channels, however, difficult Ia intelligibility of the dialogues.

According to preferred embodiments of the present invention, the reverberation introduced in Fl_i and FRi channels is within the range of 0.5 seconds to 1 second, and Ia reverberation introduced in the SU and SRi channels is within the range of 1 second to 3.5 seconds.

Thus, after the operation for modeling the response of the enclosure are obtained as output signals frontal plane FL 2 and FR 2, and SL signals backplane 2 and SR 2

4) Mix the signals obtained in the previous operation with the original C and LFE signals for the output signals of the left channel and the right channel (L and R).

According to a preferred embodiment of the present invention, the method of converting audio format hybrid binaural 5.1, comprises, before final operation Ia mixing, compressing the signal of the LFE channel LFE signal to obtain a '.

Another preferred embodiment of the invention, prior to the operation comprises auralization, the steps of:

a) separating the channel signals FL, FR, C, SL, SR in the sources that compose music L, R music, voice and frontal impact, rear impact and rear impact L R. The separation is performed using an algorithm independent component analysis. This analysis makes a comparison of the various inputs (channels) containing redundant information in different proportions. From Ia theory that multiple signals can be considered independent if they come from different physical processes, it is achieved by isolating the various components, which in this case are voice, music and effects.

b) Mix music sources L, R music, voice and frontal impact, rear impact and rear impact L R for signals constitute the input to subsequent operation Ia auralization channels. This mixing operation reconstructs the FL, FR, C, SL and SR signals with the optimum proportions of the sources that were separated in the previous operation.

According to a preferred embodiment of the present invention, the mixture of music sources L, R music, voice and frontal impact, rear impact and rear impact L R for the channels is performed according to the following percentage ranges:

FL. :: music L 70-90%, 30-10% and frontal effects voice

FR *: 70-90% R music, voice and 30-10% frontal impact

C: 70-90% voice and frontal effects, 30-10% music L and R

SL: 70-90% rear effects L, 30-10% music L

SR: 7700--9900 rear effects %% R, 30-10% music R

The aim of these optional operations is to ensure that each channel in the process auralization containing the appropriate proportion of the various components as Ia original mixture in 5.1 was optimized for playback through six physical speakers, completely different scheme to a pair of headphones. After one hour of play in headphones, Ia feature redundant information systems like quadraphonic 5.1 Ia hinders perception of spatial realism, so this adjustment is necessary.

The LFE channel bass frequencies is already in itself an independent component, and therefore information is not redundant in other channels. For this reason it is not included in the initial optional separation operations and mixing.

According to another aspect of the invention, the invention also extends to computer programs, particularly computer programs contained in a carrier, adapted to perform operations described procedure. The program may be in source code, object code or an intermediate code between source code and object code such as partially compiled form one, or any other suitable form to implement operations of the invention.

The carrier can be any device or entity capable of carrying the program. For example, the carrier may comprise a storage medium such as a ROM, a CD ROM or any other magnetic storage medium, eg a floppy disk or a hard disk. Furthermore, the carrier may be a carrier transmission, as an electrical or optical signal that can communicate through electrical cable, optical, radio or otherwise.

Alternatively, Ia carrier may be an integrated circuit in which the program is stored, being adapted to perform the operations of the process circuit. In particular, it could be an ASIC, an FPGA, a DSP, a microprocessor or microcontroller.

DESCRIPTION OF THE DRAWINGS To complement the description being made and in order to aid a better understanding of the characteristics of the invention, according to a preferred practical embodiment thereof, accompanying as an integral part of said description, a set of drawings where in an illustrative and not limitative character the following is shown:

Figure 1 shows a view of the physical location of a cinema speakers in a sound format 5.1.

2 shows an explanatory diagram of the position of the elevation angles (α) and azimuth (β).

Figure 3 shows a general outline of the operations of the method according to the present invention.

PREFERRED EMBODIMENT OF THE INVENTION

It was part of the original sound of a movie in 5.1 format to be converted into hybrid binaural, which in this case is recorded on a disc type

DVD. Figure 1 shows the position of the speaker channels in a movie theater: relative to the position in which the user must be located for optimal sound experience.

In this example, the Io procedure makes a computer, first, as shown in Figure 3, obtained from the DVD signals of the original channels in the 5.1 format (FL, FR, C, SL, SR, LFE ). The LFE channel is separated for parallel processing independently, suffering only compression resulting the signal LFE.

In this example, a selector (S) which allows the user to select or not the optional steps of removing the sources of the original channels and remixing according to a new proportions to enhance spectacularity Ia of the film is provided. To that end, the sources (music L, music R, voice and frontal impact, rear impact L and rear effects R) are separated, for example using the algorithm source separation by independent component analysis' FastICA, developed by the HUT (Helsinki University of Technology), to re-mix according to a new optimized proportions. In this example we will assume that Ia film is action, which involves Io the existence of a series of sound characteristics, such as explosions, shots, engine noise, etc. To get more spectacular Ia possible in these films, they have determined the following optimal mixing ratios:

FL '80% 20% L music + voice and frontal effects FR': R 80% + 20% music and voice frontal effects

C: 80% and frontal effects voice + music 20% L and R

SL ': 80% rear effects music L + 20% L

SR ': 80% back + 20% R effects music R

Once mixed sources in the channels of this optimal way channel dialogues (C) of the rest is separated, the FL ', FR', SL 'and SR are auralizados each in an optimal geometric situation Ia Ia enhance sound spectacular user experience. In this case, it was considered that the listener has the characteristics of a standard user based on the impulse responses of a Kemar mannequin.

Then the optimal positions of the channels, described through the elevation angle (α) and azimuth angle (β) that form with the listener are presented:

FL ': elevation 15 °; -20 ° Azimuth

FR ': elevation 15 °; 20 ° azimuth SL ': 180 ° elevation; Azimuth -40 ° SR ': 180 ° elevation; 40 ° Azimuth

Figure 2 shows the location of reference angles Ia elevation and azimuth, respectively α and β. After the operation auralization, the FL'i, FR'i, SRV SL'i and then signals are obtained, and the FL'i FR'i the response signals are processed impulse similar to a room enclosure film, with a reverberation time (T r) of about 0.5 seconds; and SL'i SR'i signals Ia and impulse response similar to a cinema hall different grounds, a reverberation time of approximately 2 seconds.

Finally, the channel obtained in the previous operation, FL'2, FR'2, SL'2 and SR'2 with LFE channels C and for only two hybrid binaural format signals corresponding to the L and R are mixed headphones.

Claims

What is claimed
1. Procedure format conversion sound binaural 5.1 hybrid, comprising the following operations
obtain the signals of the channels FL, FR, C, SL, SR and LFE of 5.1 format to be converted into binaural format hybrid;
auralizar the FL, FR, SL and SR channels in the following positions:
FL: elevation of 0 or 30 °; Azimuth -10 or -30 °.
FR: elevation of 0 or 30 °; Azimuth +10 to + 30 °.
SL: elevation of 175 ° to 195 °; Azimuth -30 ° to -60 °.
SR: elevation of 175 ° to 195 °; Azimuth + 30 ° to + 60 °,
obtaining as result the FLi, FRi, SLi and SRi signals;
independently process the signals from the front plane (FLi and FRi) and backplane (SLi and SRi), using the impulse responses of two different virtual enclosures, optimized each to said planes, resulting in the FL 2 signals, FR 2, SL 2 and SR 2;
mix 2 FL, FR 2, SL 2 and SR 2 signals obtained in the previous operation with the original signals LFE and C to obtain the two signals left and right output.
2. Procedure format conversion sound binaural 5.1 to hybrid according to the preceding claim, characterized in that the impulse responses of the virtual enclosures used for processing the front plane and rear comprise reverberation time of between 0.5 s 1 s for the first and between 1 s and 3.5 s for the second.
3. Procedure format conversion sound binaural 5.1 to hybrid according to any of the preceding claims, characterized in that prior to Ia final operation comprising mixing a compression of the LFE channel.
4. Procedure format conversion sound binaural 5.1 hybrid according to any of the preceding claims, characterized in that before the operation auralization comprising the steps of:
separate the signals of the channels FL, FR, C, SL, SR in the sources that comprise: L music, music R, voice and frontal impact, rear impact and rear impact R L;
remixing the estimated proportions optimized for further processing sources, reconstructing the channels FL, FR, C, SL and SR.
5. Procedure sound format conversion 5.1 binaural hybrid according to the preceding claim, characterized in that the operation of remixing of music sources L, R music, voice and frontal impact, rear impact and rear impact L R is made according with the following percentage ranges:
FL. :: music L 70-90%, 30-10% and frontal effects voice
FR *: 70-90% R music, voice and 30-10% frontal impact
C: 70-90% voice and frontal effects, 30-10% music L and R
SL: 70-90% rear effects L, 30-10% music L
SR: 7700--9900 rear effects %% R, 30-10% music R
6. The method of converting audio format 5.1 hybrid binaural according to the preceding claim, characterized in that it is carried out by one device among of Ia following list: an ASIC, an FPGA, a DSP, a microprocessor and a microcontroller .
7. Computer program comprising program instructions that cause a computer to perform the method steps according to any of the preceding claims.
8. Computer program according to claim 7, characterized in that it is stored in a storage means.
9. Computer program according to claim 7, characterized in that is transmitted through a carrier signal.
PCT/ES2008/070246 2008-01-17 2008-12-30 Method of converting 5.1 sound format to hybrid binaural format WO2009090281A1 (en)

Priority Applications (2)

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ESP200800112 2008-01-17
ES200800112A ES2323563B1 (en) 2008-01-17 2008-01-17 Conversion Procedure 5.1 sound format. a hybrid binaural.

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Citations (4)

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Publication number Priority date Publication date Assignee Title
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US6002775A (en) * 1997-01-24 1999-12-14 Sony Corporation Method and apparatus for electronically embedding directional cues in two channels of sound
EP1816890A1 (en) * 2006-02-01 2007-08-08 Sony Corporation Audio reproducing system and method thereof
WO2007123788A2 (en) * 2006-04-03 2007-11-01 Srs Labs, Inc. Audio signal processing

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Publication number Publication date Type
ES2323563A1 (en) 2009-07-20 application
ES2323563B1 (en) 2010-04-27 grant

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