WO1999057941A1 - Matrix-encoded surround-sound channels in a discrete digital sound format - Google Patents
Matrix-encoded surround-sound channels in a discrete digital sound format Download PDFInfo
- Publication number
- WO1999057941A1 WO1999057941A1 PCT/US1999/009468 US9909468W WO9957941A1 WO 1999057941 A1 WO1999057941 A1 WO 1999057941A1 US 9909468 W US9909468 W US 9909468W WO 9957941 A1 WO9957941 A1 WO 9957941A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channels
- sunound
- sound
- discrete
- motion picture
- Prior art date
Links
Classifications
-
- 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
- This invention relates to the field of multichannel audio. More particularly the invention relates to matrix-encoded surround-sound channels in a discrete typically digital sound format for motion picture soundtracks.
- Dolby Laboratories introduced its four-channel stereo-optical version of Dolby Stereo, which employed audio matrix encoding and decoding in order to carry 4 channels of sound on the two SVA optical tracks.
- Dolby and “Dolby Stereo” are trademarks of Dolby Laboratories Licensing Corporation.
- Dolby Stereo for SVA optical tracks employs the "MP" matrix, a type of 4:2:4 matrix system that records four source channels of sound (left, right, center and surround) on the two SVA tracks and reproduces four channels.
- Dolby Stereo stereo- optical format employed Dolby A-type analog audio noise reduction
- Dolby Laboratories introduced an improved analog audio processing system, Dolby SR, which is now used in Dolby Stereo optical soundtrack films.
- Multichannel motion picture sound was employed commercially at least as early as "Fantasound” in which the four-channel soundtrack for the motion picture Fantasia was carried in respective optical tracks on a separate film synchronized with the picture-carrying film.
- various "magnetic stripe” tech- niques were introduced in which multiple channels of sound were recorded in separate tracks on magnetizable materials affixed to the picture-carrying film.
- magnetic striped 35 mm film carried three or four separate soundtracks while magnetic striped 70 mm film carried six separate soundtracks.
- PerspectaSound employed a subaudible control tone on the monaural soundtrack in order to direct the sound to selected loudspeakers behind the screen.
- Magnetic striped 35 mm films became obsolete after the introduction of the Dolby Stereo 35 mm optical format.
- Dolby noise reduction was applied to four of the six discrete audio tracks of magnetic striped 70 mm motion picture film.
- tracks 1 and 2 (recorded in the magnetic stripe located between the left edge of the film and the left- hand sprocket holes) carry the left main screen channel and low-frequency-only "bass extension” information, respectively;
- track 3 (recorded in the magnetic stripe located between the left-hand sprocket holes and the picture) carries the center main screen channel;
- track 4 (recorded in the magnetic stripe located between the picture and the right-hand sprocket holes) also carries low- frequency-only "bass extension” information;
- tracks 5 and 6 (recorded in the magnetic stripe located between the right sprocket holes and the right edge of the film) carry the right main screen channel and the single surround channel, respectively. Dolby noise reduction is not applied to the bass extension information.
- Dolby Stereo for 70 mm magnetic soundtrack motion picture films
- two surround channels are provided instead of one (referred to as "split surrounds" or "stereo surrounds").
- Tracks 1, 3, 5 and 6 are the same as in conventional Dolby Stereo 70 mm; however, mid- and high-frequency left surround information is recorded (with Dolby noise reduction) in track 2 along with the low-frequency bass information, and mid- and high-frequency right surround information is recorded (with Dolby noise reduction) in track 4 along with the low-frequency bass informa- tion.
- the mid- and high-frequency stereo surround information on tracks 2 and 4 is fed to the left and right surround speakers, respectively, combined with monophonic surround bass information from track 6.
- Dolby Stereo 70 mm was an early form of the now-common "5.1" channel (sometimes referred to as six channel) configuration: left, center, and right main screen channels, left and right surround sound channels and a low-frequency bass enhancement (LFE) or sub woofer channel.
- the LFE channel which carries much less information than the other full-bandwidth channels, is now referred to as ".1" channels.
- Dolby Laboratories Licensing Corporation Digital is a trademark of Dolby Laboratories Licensing Corporation.
- 5.1 channel (left, center, right, left surround, right surround and LFE) soundtrack information is digitally encoded employing Dolby Laboratories AC-3 perceptual encoding scheme. That encoded information is in turn encoded as blocks of symbols optically printed between the film's sprocket holes along one side of the film.
- the analog SVA tracks are retained for compatibility. Details of the Dolby Digital 35 mm film format are set forth in U.S. Patents 5,544,140, 5,710,752 and 5,757,465.
- the basic elements of the Dolby AC-3 perceptual coding scheme are set forth in U.S. Patent 5,583,962.
- Dolby AC-3 Details of a practical implementation of Dolby AC-3 are set forth in Document A/52 of the United States Television Systems Committee (ATSC), "Digital Audio Compression Standard (AC-3)," December 20, 1995 (available on the world wide web of the Internet at ⁇ www.atsc.org> .
- ATSC United States Television Systems Committee
- AC-3 Digital Audio Compression Standard
- the Dolby Digital system typically provides the channel discreteness of 70 mm magnetic soundtrack films while preserving the low cost and compatibility of 35 mm optical soundtrack films.
- Sony introduced its Sony Dynamic Digital Sound (SDDS) format for 35 mm motion picture film.
- SDDS Sony Dynamic Digital Sound
- channel (sometimes referred to as eight channel) (left, left center, center, right center, right, left surround, right surround and LFE) soundtrack information is digitally encoded using a form of Sony's ATRAC perceptual coding. That encoded information is in turn encoded as strips of symbols optically printed between each edge of the film and the nearest sprocket holes. Sony, Sony Dynamic Digital Sound, SDDS, and ATRAC are trademarks. Some details of the Sony SDDS system are set forth in U.S. Patents 5,550,603; 5,600,617; and 5,639,585.
- DTS Digital Theater Systems Corporation
- 35 mm motion picture film carries a time code track for the purpose of synchronizing the picture with a CD-ROM encoded using a type of perceptual coding with 5.1 channel soundtrack information (left, center, right, left surround, right surround and LFE).
- DTS is a trademark. -5-
- Figure 1 shows an idealized loudspeaker arrangement for a typical theater 10 employing the Dolby Digital or the DTS 5.1 channel systems.
- the left channel soundtrack L is applied to left loudspeaker(s) 12
- the center channel soundtrack C is applied to the center loudspeaker(s) 14
- the right channel soundtrack R is applied to the right loudspeaker(s) 16, all of which loudspeakers are located behind the motion picture screen 18.
- These may be referred to as main screen channels.
- the left surround channel L s is applied to left surround loudspeaker(s) 20 shown at the rear portion of the left wall 22 of the theater.
- the right surround channel R s is applied to right surround loudspeaker(s) 24 shown at the rear portion of the right wall 26 of the theater.
- LFE low frequency effect
- subwoofer loudspeakers carrying non- directional low frequency sound
- Figure 2 shows an idealized loudspeaker arrangement for a typical theater 10 employing the Sony SDDS 7.1 channel system.
- the arrangement is the same as shown in Figure 1 for the Dolby and DTS systems with the exception that the Sony SDDS system provides two additional main screen channels — a left center channel LC that is applied to left center loudspeaker(s) 13 and a right center channel RC that is applied to right center loudspeaker(s) 15.
- All three digital motion picture sound systems provide at least three discrete main screen channels and two discrete surround sound channels. Although two surround sound channels are sufficient to satisfy the creators of and audiences for most -6- multichannel sound motion pictures, there are, nevertheless, desires for more than two su ⁇ ound sound channels for some motion pictures.
- the 5,602,923 and 5,717,765 patents add one or more very high frequency tones to the left surround and right surround channels in order to direct all or a portion of the information in a respective su ⁇ ound channel from the normal left surround and right su ⁇ ound loudspeakers to loudspeakers above the audience and above the motion picture screen.
- a shortcoming of that approach is its inability to reproduce different surround sound channels simultaneously from each of the more than two banks of surround sound loudspeakers. In other words, at any one time there are only two possible surround sound channels even though the loudspeaker locations that produce those channels may be varied. Accordingly, there is still an unfulfilled need to provide more than two surround sound channels within the current formats of the Dolby Digital, Sony SDDS and DTS digital soundtrack systems.
- more than two surround sound channels are provided within the format of a digital soundtrack system designed to provide only two surround sound channels.
- the digital audio stream of the digital soundtrack system designed to provide only two surround sound channels remains unaltered, thus providing compatibility with existing playback equipment.
- the format of the media carrying the digital soundtracks is unaltered.
- the digital information carrying symbols printed on the motion picture film remain unchanged — the symbol or "bit" size need not be -8- reduced.
- the optically recorded symbols represent digital information and the digital information, in turn, represents discrete motion picture soundtrack channels.
- the "discreteness" of the digital soundtrack system is not audibly diminished by employing matrix technology to surround sound channels, particularly if active matrix decoding is employed.
- matrix technology to surround sound channels, particularly if active matrix decoding is employed.
- the human ear's relative insensitivity with respect to rearward-originating sounds compared to the ear's sensitivity to forward- originating sounds makes the use of matrix encoding for surround channels highly acceptable in an otherwise discrete channel reproduction system (any crosstalk among su ⁇ ound channels behind the head is likely not to be perceived by the listener; moreover, crosstalk among channels in the same adjacent quadrants is more acceptable than crosstalk, for example, from the dialog-carrying center channel to the su ⁇ ound channel in an LCRS matrix system).
- aspects of the invention include (1) a digital or analog format medium, such as motion picture film, magnetic tape, optical disc, or magneto-optical disc carrying discrete motion picture soundtracks in which two discrete surround-sound channels are matrix encoded with three, four or five surround-sound channels; (2) a method of producing motion picture soundtracks in which at least three main channels are recorded in discrete soundtrack channels and in which three, four or five surround- sound channels are matrix-encoded and recorded in two discrete surround-sound soundtrack channels; (3) a method of reproducing a motion picture soundtrack carried in at least five discrete motion picture soundtrack channels in which the discrete channels include two su ⁇ ound-sound channels, the two discrete surround-sound -9- channels carrying three, four or five su ⁇ ound-sound matrix-encoded channels; and (4) apparatus for reproducing a motion picture soundtrack carried in at least five discrete motion picture soundtrack channels in which the discrete channels include two surround-sound channels, the two discrete surround-sound channels carrying three, four or five surround-sound matrix-encoded channels.
- Figure 1 is a schematic plan view of a motion picture theater showing idealized loudspeaker locations for reproducing left (L), center (C), right (R), left surround (L s ) and right surround (R s ) motion picture soundtrack channels such as are provided by Dolby Digital and DTS digital soundtracks.
- Figure 2 is a schematic plan view of a motion picture theater showing idealized loudspeaker locations for reproducing left (L), left center (LC), center (C), right center (RC), right (R), left su ⁇ ound (L s ) and right surround (R s ) motion picture soundtrack channels such as are provided by Sony SDDS digital soundtracks.
- Figure 3 is a schematic plan view of a motion picture theater showing an idealized loudspeaker arrangement according to a three surround channel embodiment of the invention.
- Figure 4 is a schematic plan view of a motion picture theater showing an idealized loudspeaker arrangement according to a four surround channel embodiment of the invention.
- Figure 5 is a schematic plan view of a motion picture theater showing an idealized loudspeaker arrangement according to a five surround channel embodiment of the invention.
- Figure 6 is an idealized functional block diagram of a conventional prior art Dolby MP Matrix encoder configured as a 3:2 encoder.
- Figure 7 is an idealized functional block diagram of a passive surround 2:3 decoder capable of decoding Dolby MP matrix encoded signals. Best Modes for Carrying Out the Invention Embodiments of the invention for providing playback of three, four and five surround sound channels in a digital soundtrack system designed to provide only two surround sound channels are shown in Figures 3, 4, and 5, respectively. Although only three main screen loudspeaker channels (L, C and R) are shown in Figures 3, 4, and 5, it is to be understood that five main screen loudspeaker channels (L, LC, C, -10-
- RC and R may be employed as in the manner of Figure 2.
- the invention is equally applicable to and usable with the Dolby Digital, Sony SDDS and DTS digital soundtrack systems.
- the invention may also be applied to a discrete analog soundtrack system such as the six track magnetic 70 mm that employs discrete left sur- round and right surround tracks.
- like reference numerals are used to describe the same, similar or corresponding elements.
- Figure 3 shows an idealized loudspeaker arrangement for a typical theater 10 employing a three surround channel embodiment of the invention.
- the left surround and right surround channel audio streams from the Dolby Digital, Sony SDDS or DTS digital soundtrack decoding apparatus are applied to a 2:3 matrix decoder 32 as its Lj- (left total) and R ⁇ (right total) inputs.
- the left surround and right su ⁇ ound channel audio streams have been 3:2 matrix encoded with left surround (L s ), right surround (R s ) and center surround (C s ) audio inputs prior to the production of the respective Dolby Digital, Sony SDDS or DTS digital soundtrack.
- the L s , R s and C s audio inputs are 3:2 matrix encoded into two surround audio inputs and those two surround audio inputs are applied along with the main screen and LFE inputs to the normal Dolby Digital, Sony SDDS or DTS digital soundtrack encoding and recording apparatus (not shown).
- the three de-matrixed su ⁇ ound sound channels L s , R s and C s from decoder 32 are applied to the left surround loudspeaker(s) 34, the right surround loudspeaker(s) 38 and the center surround loudspeaker(s) 36, respectively.
- the surround loudspeaker locations are shown in idealized positions.
- left surround loudspeakers spaced along the left side wall of the theater starting from a location about midway between the front and rear of the theater and extending to the rear wall 28.
- the right su ⁇ ound loudspeakers are spaced along the along the right side wall in a minor image of the left surround loudspeaker arrangement.
- the center surround loudspeakers are spaced along the rear wall 28 of the theater.
- Figure 4 shows an idealized loudspeaker arrangement for a typical theater 10 employing a four surround channel embodiment of the invention.
- the left surround and right surround channel audio streams from the Dolby Digital, Sony SDDS or
- DTS digital soundtrack decoding apparatus are applied to a 2:4 matrix decoder 42 as its Lj (left total) and R ⁇ (right total) inputs.
- the left surround and right su ⁇ ound channel audio streams have been 4:2 matrix encoded with left front sur- -11- round (LF S ), left rear surround (LR S ), right front surround (RF S ), and right rear surround (RR S ) audio inputs prior to the production of the respective Dolby Digital, Sony SDDS or DTS digital soundtrack.
- the LF S , LR S , RF S , and RR S audio inputs are 4:2 matrix encoded into two surround audio inputs and those two surround audio inputs are applied along with the main screen and LFE inputs to the normal Dolby Digital, Sony SDDS or DTS digital soundtrack encoding and recording apparatus (not shown).
- the four de-matrixed su ⁇ ound sound channels LF S , LR S , RF S , and RR S from decoder 42 are applied to the left front surround loudspeaker(s) 44, the left rear surround loudspeaker(s) 46, the right front surround loudspeaker(s) 48 and the right rear su ⁇ ound loudspeaker(s) 50, respectively.
- the surround loudspeaker locations are shown in idealized positions.
- the right front and right rear surround loudspeakers are spaced along the right side wall and rear wall in a mirror image of the left surround loudspeaker arrange- ment.
- Figure 5 shows an idealized loudspeaker arrangement for a typical theater 10 employing a five surround channel embodiment of the invention.
- the left surround and right surround channel audio streams from the Dolby Digital, Sony SDDS or DTS digital soundtrack decoding apparatus are applied to a 2:5 matrix decoder 52 as its Lj. (left total) and R ⁇ (right total) inputs.
- the left surround and right surround channel audio streams have been 5:2 matrix encoded with left front surround (LF S ), left rear surround (LR S ), right front surround (RF S ), right rear surround (RR S ) and center surround (C s ) audio inputs prior to the production of the respective Dolby Digital, Sony SDDS or DTS digital soundtrack.
- the LF S , LR S , RF S , and RR S audio inputs are 5:2 matrix encoded into two surround audio inputs and those two su ⁇ ound audio inputs are applied along with the main screen and LFE inputs to the normal Dolby Digital, Sony SDDS or DTS digital soundtrack encoding and recording apparatus (not shown).
- the five de-matrixed surround sound -12- channels LF S , LR S , RF S , RR S and C s from decoder 52 are applied to the left front surround loudspeaker(s) 44, the left rear surround loudspeaker(s) 46, the right front surround loudspeaker (s) 48, the right rear surround loudspeaker(s) 50, and the center surround loudspeaker(s), respectively.
- the su ⁇ ound loudspeaker locations are shown in idealized positions. In normal practice, there are a plurality of left front surround loudspeakers spaced along the left side wall of the theater starting from a location about midway between the front and rear of the theater and extending about half way to the rear wall 28.
- left rear surround loudspeakers spaced along the left side wall of the theater starting at a location spaced from the last of the left su ⁇ ound loudspeaker and extending to the rear wall 28.
- the center surround loudspeakers are spaced along the rear wall 28 of the theater.
- the right front and right rear su ⁇ ound loudspeakers are spaced along the right side wall and rear wall in a minor image of the left surround loudspeaker a ⁇ angement.
- the invention is described in connection with encoding three, four or five su ⁇ ound channels into the two discrete surround channels available in the three digital motion picture soundtrack systems, it is believed that three surround channels may be optimum. There are several reasons for this. First, the human ear is relatively insensitive to direction behind the head and is unable to resolve a large number of sound source directions. Second, as the number of surround channels increases, the number of loudspeakers carrying each channel usually is reduced (the same number of surround loudspeakers are simply divided up among the available number of surround channels). As a bank of loudspeakers dedicated to a particular surround sound channel becomes smaller and tends toward becoming a point source, a listener's attention is more likely to be distracted away from the motion picture screen.
- the MP 4:2 encode matrix is preferably employed as a 3:2 matrix by applying no input to the encode -13- matrix's sunound (S) input.
- the MP 3:2 encode matrix is defined by the following relationships:
- L is the Left channel signal
- R is the Right channel signal
- C is the Center channel signal
- S is the Sunound channel signal.
- L f and R ⁇ are the matrix output signals.
- the MP 2:3 decode matrix is defined by the following relationships:
- the matrix decoder forms its output signals from weighted sums of the 3:2 encoder matrix output signals L ⁇ and R ⁇ .
- the crosstalk component (0.707C) in the L' signal, etc.) are not desired but are a limitation of the basic 3:2:3 matrix technique.
- a prefened approach for improving the performance of a 2:3 MP matrix decoder is set forth in U.S. Patent 5,046,098.
- Figure 6 is an idealized functional block diagram of a conventional prior art Dolby MP Matrix encoder configured as a 3:2 encoder.
- the encoder accepts three separate input signals; left, center, and right (L, C, R), and creates two final outputs, left-total and right-total (Lt and Rt).
- the C input is divided equally and summed with the L and R inputs with a 3 dB level reduction in order to maintain constant acoustic power.
- Lt L + 0.707 C
- Rt R + 0.707 C, where L is the left input signal, R is the right input signal, and C is the center input signal.
- Audio signals encoded by a Dolby 3:2 MP matrix encoder may be decoded by a Dolby Sunound decoder — a passive sunound decoder, or a Dolby Pro Logic decoder — an active sunound decoder.
- Passive decoders are limited in their ability to place sounds with precision for all listener positions due to inherent crosstalk limitations in the audio matrix.
- Dolby Pro Logic active decoders employ directional enhancement techniques which reduce such crosstalk components.
- FIG. 7 is an idealized functional block diagram of a passive sunound decoder capable of decoding Dolby MP matrix encoded signals. Except for level and channel balance conections, the Lt input signal passes unmodified and becomes the left output. The Rt input signal likewise becomes the right output. Lt and Rt also carry the center signal C, which is produced simply by summing Lt and Rt.
- a passive decoder may be usable, it is prefened that a Dolby Pro Logic decoder is employed (configured as a 3:2 decoder) in order to provide more "discreteness" among the three decoded sunound sound channels.
- the MP matrix is not prefened for use in a 4:2:4 audio matrix systems of the present invention because the inherent diamond shape of the 4:2:4 MP matrix is designed to favor a diamond-shaped anangement in which three of the channels
- the invention is applicable generally to a medium carrying at least five discrete motion picture soundtrack channels, wherein the discrete channels include two discrete sunound-sound channels, the two discrete sunound-sound channels carrying three, four or five sunound-sound matrix-encoded channels.
- the discrete motion picture channels may be carried on the medium in a digital format, in which case the medium may be any of the following: motion picture film having optically recorded symbols representing digital information, the digital information, in turn, representing said discrete motion picture soundtrack channels (examples include the presentation format of the Dolby Digital and Sony SDDS systems) (see, for example, U.S.
- the discrete motion picture channels may be carried on the medium in an analog format, in which case the medium may be either of the following: a motion picture film with one or more magnetizable coatings having tracks of magnetically-oriented particles representing analog information, each track carrying a discrete motion picture soundtrack channel, or magnetic tape having tracks of magnetically-oriented particles representing analog information, each track carrying a discrete motion picture soundtrack channel.
- the sunound-sound channels preferably are matrix encoded for compatible reproduction when the two discrete sunound-sound channels are reproduced without matrix decoding. Thus, backward compatibility is preserved.
- the required phase relationships for maintaining compatible two channel playback are well known in the art.
- Recording motion picture soundtracks in accordance with the present invention may be accomplished by (1) mixing sound information for at least three main screen sound channels and for three, four or five sunound-sound channels, (2) matrix encoding the three, four or five sunound-sound channels into two matrix-encoded sunound-sound channels, and (3) recording the at least three main screen sound channels and the two matrix-encoded sunound-sound channels in respective discrete soundtrack channels. Suitable mixing techniques are well known in the art.
- the three-channel version of the Dolby MP encode matrix preferably is -18- employed, in the case of four sunound-sound channels, the QS matrix preferably is employed, and, in the case of five sunound-sound channels, the encode matrix of any suitable known 5:2:5 matrix system may be employed.
- Techniques for recording sound channels in discrete soundtracks are known in the art (see, for example U.S. Patents 5,453,802; 5,600,617; and 5,639,585).
- matrix encoding may be done before or after recording the master recording.
- producing the motion picture soundtracks may be accomplished by (1) mixing sound information for at least three main sound channels and for three, four or five sunound-sound channels, (2) recording the main sound channels and the sunound-sound channels in discrete channels, respectively, on a master recording, (3) reproducing from the master recording the main sound channels and the sunound-sound channels, and (4) matrix encoding the three, four or five sunound-sound channels into two matrix-encoded sunound-sound channels.
- the master recording may be digital employing, for example, any of the digital formats set forth above, or analog, employing, for example, any of the analog formats set forth above.
- Further steps in producing the motion picture soundtracks may include (5) producing optical symbols representing digital information, the digital information, in turn, representing discrete motion picture soundtrack channels in response, respectively, to the main sound channels reproduced from the master recording and the two matrix-encoded sunound-sound channels encoded from the sunound-sound channels reproduced from the master recording, and (6) photographically printing the optical symbols on motion picture film to produce a master sound negative film print.
- Producing optical symbols is preferably accomplished as in the Dolby Digital system described in said 5,544,140, 5,583,962, 5,710,752 and 5,757,465 patents and in the cited AC-3 paper.
- optical symbols may be produced as in accordance with the Sony SDDS system.
- a further step in producing the motion picture soundtracks may include producing an optical disc containing digitally-encoded audio information representing discrete motion picture soundtrack channels in response, respectively, to the main sound channels reproduced from the master recording and the two matrix- -19- encoded sunound-sound channels encoded from the sunound-sound channels reproduced from the master recording.
- Various techniques for digitally encoding audio information and recording the encoded information on an optical disc are well known in the art. As noted above, matrix encoding may be done before or after recording the master recording. It should be understood that statements regarding particular steps set forth above apply also to conesponding steps discussed below.
- producing the motion picture soundtracks may be accomplished by (1) mixing sound information for at least three main sound channels and for three, four or five sunound-sound channels, (2) matrix encoding the three, four or five sunound-sound channels into two matrix-encoded sunound-sound channels, and (3) recording the main sound channels and the two matrix-encoded sunound-sound channels in discrete channels, respectively, on a master recording.
- Further steps in producing the motion picture soundtracks may include (4) producing optical symbols representing digital information, the digital information, in turn, representing discrete motion picture soundtrack channels in response, respectively, to the main sound channels and the two matrix-encoded sunound-sound channels recorded on the master recording, and (5) photographically printing the optical symbols on motion picture film to produce a master sound negative film print.
- a further step in producing the motion picture soundtracks may include producing an optical disc containing digitally-encoded audio information representing discrete motion picture soundtrack channels in response, respectively, to the main sound channels and the two matrix-encoded sunound-sound channels recorded on said master recording.
- the master recording may be any one of the following: (1) a magneto-optical disc recording (this is prefened in producing a Dolby Digital soundtrack), (2) a magnetic tape recording in which the recorded information represents digital information, (3) a magnetic stripe on film recording in which the recorded information represents analog information, or (4) a magnetic tape recording in which the recorded information represents analog information. -20-
- a composite motion picture film print may be made from the master sound negative film print and a master picture element negative film print. Various techniques for doing so are well known in the art.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Stereophonic System (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000547817A JP4424849B2 (en) | 1998-05-05 | 1999-04-30 | Ambient sound channel matrix encoded in separate digital sound format |
CA002330960A CA2330960C (en) | 1998-05-05 | 1999-04-30 | Matrix-encoded surround-sound channels in a discrete digital sound format |
DK99921562.7T DK1077016T3 (en) | 1998-05-05 | 1999-04-30 | Matrix-encoded "ambient sound" channels with discrete digital audio format |
AT99921562T ATE454018T1 (en) | 1998-05-05 | 1999-04-30 | MATRIX-CODED SOUND CHANNELS IN DISCRETE DIGITAL SOUND FORMAT |
DE69941870T DE69941870D1 (en) | 1998-05-05 | 1999-04-30 | L-SOUND FORMAT |
AU38744/99A AU3874499A (en) | 1998-05-05 | 1999-04-30 | Matrix-encoded surround-sound channels in a discrete digital sound format |
EP99921562A EP1077016B1 (en) | 1998-05-05 | 1999-04-30 | Matrix-encoded surround-sound channels in a discrete digital sound format |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/072,707 | 1998-05-05 | ||
US09/072,707 US6624873B1 (en) | 1998-05-05 | 1998-05-05 | Matrix-encoded surround-sound channels in a discrete digital sound format |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999057941A1 true WO1999057941A1 (en) | 1999-11-11 |
Family
ID=22109279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/009468 WO1999057941A1 (en) | 1998-05-05 | 1999-04-30 | Matrix-encoded surround-sound channels in a discrete digital sound format |
Country Status (11)
Country | Link |
---|---|
US (1) | US6624873B1 (en) |
EP (1) | EP1077016B1 (en) |
JP (1) | JP4424849B2 (en) |
AR (1) | AR014987A1 (en) |
AT (1) | ATE454018T1 (en) |
AU (1) | AU3874499A (en) |
CA (1) | CA2330960C (en) |
DE (1) | DE69941870D1 (en) |
DK (1) | DK1077016T3 (en) |
ES (1) | ES2338391T3 (en) |
WO (1) | WO1999057941A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001087015A3 (en) * | 2000-05-10 | 2003-02-27 | Digital Theater Syst Inc | Discrete multichannel audio with a backward compatible mix |
WO2009089209A1 (en) * | 2008-01-11 | 2009-07-16 | Dolby Laboratories Licensing Corporation | Matrix decoder |
US8280743B2 (en) | 2005-06-03 | 2012-10-02 | Dolby Laboratories Licensing Corporation | Channel reconfiguration with side information |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPQ942400A0 (en) * | 2000-08-15 | 2000-09-07 | Lake Technology Limited | Cinema audio processing system |
US6804565B2 (en) | 2001-05-07 | 2004-10-12 | Harman International Industries, Incorporated | Data-driven software architecture for digital sound processing and equalization |
US7447321B2 (en) | 2001-05-07 | 2008-11-04 | Harman International Industries, Incorporated | Sound processing system for configuration of audio signals in a vehicle |
US7451006B2 (en) * | 2001-05-07 | 2008-11-11 | Harman International Industries, Incorporated | Sound processing system using distortion limiting techniques |
US7391869B2 (en) * | 2002-05-03 | 2008-06-24 | Harman International Industries, Incorporated | Base management systems |
WO2003093775A2 (en) * | 2002-05-03 | 2003-11-13 | Harman International Industries, Incorporated | Sound detection and localization system |
US7451093B2 (en) * | 2004-04-29 | 2008-11-11 | Srs Labs, Inc. | Systems and methods of remotely enabling sound enhancement techniques |
US7106411B2 (en) * | 2004-05-05 | 2006-09-12 | Imax Corporation | Conversion of cinema theatre to a super cinema theatre |
US7283634B2 (en) * | 2004-08-31 | 2007-10-16 | Dts, Inc. | Method of mixing audio channels using correlated outputs |
JP4479631B2 (en) * | 2005-09-07 | 2010-06-09 | ヤマハ株式会社 | Audio system and audio device |
US8050434B1 (en) | 2006-12-21 | 2011-11-01 | Srs Labs, Inc. | Multi-channel audio enhancement system |
CN102017402B (en) | 2007-12-21 | 2015-01-07 | Dts有限责任公司 | System for adjusting perceived loudness of audio signals |
KR101461685B1 (en) * | 2008-03-31 | 2014-11-19 | 한국전자통신연구원 | Method and apparatus for generating side information bitstream of multi object audio signal |
US20100310100A1 (en) * | 2009-06-03 | 2010-12-09 | International Truck Intellectual Property Company, Llc | Loudspeaker input switch system to reorient sound in truck |
US8538042B2 (en) | 2009-08-11 | 2013-09-17 | Dts Llc | System for increasing perceived loudness of speakers |
RU2617553C2 (en) | 2011-07-01 | 2017-04-25 | Долби Лабораторис Лайсэнзин Корпорейшн | System and method for generating, coding and presenting adaptive sound signal data |
WO2013032822A2 (en) | 2011-08-26 | 2013-03-07 | Dts Llc | Audio adjustment system |
US9312829B2 (en) | 2012-04-12 | 2016-04-12 | Dts Llc | System for adjusting loudness of audio signals in real time |
US9632961B2 (en) | 2012-12-26 | 2017-04-25 | Intel Corporation | Crosstalk aware decoding for a data bus |
US9330039B2 (en) * | 2012-12-26 | 2016-05-03 | Intel Corporation | Crosstalk aware encoding for a data bus |
US10078612B2 (en) * | 2014-07-28 | 2018-09-18 | Intel Corporation | Mode selective balanced encoded interconnect |
US10488936B2 (en) | 2014-09-30 | 2019-11-26 | Apple Inc. | Motion and gesture input from a wearable device |
US10154344B2 (en) | 2015-11-25 | 2018-12-11 | Thomas Mitchell Dair | Surround sound applications and devices for vertically-oriented content |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5046098A (en) * | 1985-03-07 | 1991-09-03 | Dolby Laboratories Licensing Corporation | Variable matrix decoder with three output channels |
US5508761A (en) * | 1993-12-07 | 1996-04-16 | Sony Corporation | Apparatus for reproducing a digital pattern from motion picture film, and the motion picture film |
US5583962A (en) * | 1991-01-08 | 1996-12-10 | Dolby Laboratories Licensing Corporation | Encoder/decoder for multidimensional sound fields |
US5717765A (en) * | 1994-03-07 | 1998-02-10 | Sony Corporation | Theater sound system with upper surround channels |
Family Cites Families (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE529308A (en) | 1953-10-08 | |||
GB1522135A (en) | 1974-08-29 | 1978-08-23 | Dolby Laboratories Inc | Stereophonic sound system |
GB1522599A (en) | 1974-11-16 | 1978-08-23 | Dolby Laboratories Inc | Centre channel derivation for stereophonic cinema sound |
US3973839A (en) | 1974-12-30 | 1976-08-10 | Mca Systems, Inc. | Special effects generation and control system for motion pictures |
GB2006583B (en) | 1977-10-14 | 1982-04-28 | Dolby Lab Licensing Corp | Multi-channel sound systems |
US4256389A (en) | 1978-09-27 | 1981-03-17 | Paramount Sound Systems Corporation | Method and system of controlling sound and effects devices by a film strip |
US4306781A (en) | 1980-01-21 | 1981-12-22 | John Mosely | Multi-channel sound and data system |
US4385814A (en) | 1980-06-25 | 1983-05-31 | Paramount Sound Systems Corporation | System for controlling distinct devices in a theater |
US4577305A (en) | 1983-03-14 | 1986-03-18 | Dolby Laboratories Licensing Corporation | Stereophonic motion picture photographic sound-tracks compatible with different sound projection formats and record and playback apparatus therefore |
US4941177A (en) | 1985-03-07 | 1990-07-10 | Dolby Laboratories Licensing Corporation | Variable matrix decoder |
US4680796A (en) | 1986-04-11 | 1987-07-14 | Kintek, Inc. | Sound encoding system |
US5450146A (en) | 1989-05-24 | 1995-09-12 | Digital Theater Systems, L.P. | High fidelity reproduction device for cinema sound |
US5386255A (en) | 1990-09-28 | 1995-01-31 | Digital Theater Systems, L.P. | Motion picture digital sound system and method with primary sound storage edit capability |
US5155510A (en) | 1990-11-29 | 1992-10-13 | Digital Theater Systems Corporation | Digital sound system for motion pictures with analog sound track emulation |
DE69207380T2 (en) | 1991-02-04 | 1996-06-05 | Dolby Laboratories Licensing Corp., San Francisco, Calif. | Storage medium and device for recovering data from the medium by oversampling |
JPH05109196A (en) | 1991-10-14 | 1993-04-30 | Sony Corp | Recording method |
US5453802A (en) | 1992-06-10 | 1995-09-26 | Sony Electronics Inc. | Method and apparatus for photographically recording digital audio and a medium having photographically recorded digital sountracks |
US5327182A (en) | 1992-06-10 | 1994-07-05 | Sony Electronics, Inc. | Method and apparatus for reading photographically recorded digital audio soundtracks |
US5291557A (en) | 1992-10-13 | 1994-03-01 | Dolby Laboratories Licensing Corporation | Adaptive rematrixing of matrixed audio signals |
JPH06243467A (en) | 1992-11-30 | 1994-09-02 | Sony Corp | Motion picture film and its recording device and reproducing device |
JPH06208179A (en) | 1993-01-08 | 1994-07-26 | Sony Corp | Cinematographic film and its reproducing device |
JP3231884B2 (en) | 1993-04-16 | 2001-11-26 | ソニー シネマ プロダクツ コーポレーション | Audio recording device for movie film and audio recording system for movie film |
US5386256A (en) | 1993-04-28 | 1995-01-31 | Sony Dynamic Digital Sound, Inc. | Printer module for recording a digital soundtrack |
ES2165370T3 (en) | 1993-06-22 | 2002-03-16 | Thomson Brandt Gmbh | METHOD FOR OBTAINING A MULTICHANNEL DECODING MATRIX. |
US5463424A (en) | 1993-08-03 | 1995-10-31 | Dolby Laboratories Licensing Corporation | Multi-channel transmitter/receiver system providing matrix-decoding compatible signals |
JPH1138527A (en) | 1993-09-24 | 1999-02-12 | Sony Corp | Digital sound signal reproducing device for projector |
US5617158A (en) | 1993-12-07 | 1997-04-01 | Sony Corporation | Digital sound recording on motion picture film |
US5451942A (en) | 1994-02-04 | 1995-09-19 | Digital Theater Systems, L.P. | Method and apparatus for multiplexed encoding of digital audio information onto a digital audio storage medium |
DE4409368A1 (en) | 1994-03-18 | 1995-09-21 | Fraunhofer Ges Forschung | Method for encoding multiple audio signals |
JPH07270945A (en) | 1994-03-31 | 1995-10-20 | Sony Corp | Data recorder for motion picture film |
JP3277679B2 (en) | 1994-04-15 | 2002-04-22 | ソニー株式会社 | High efficiency coding method, high efficiency coding apparatus, high efficiency decoding method, and high efficiency decoding apparatus |
US5638343A (en) | 1995-07-13 | 1997-06-10 | Sony Corporation | Method and apparatus for re-recording multi-track sound recordings for dual-channel playbacK |
US5639585A (en) | 1995-08-31 | 1997-06-17 | Sony Corporation | System for photographically recording digital data and analog soundtrack, and medium having digital data and analog soundtrack recorded thereon |
US5798818A (en) * | 1995-10-17 | 1998-08-25 | Sony Corporation | Configurable cinema sound system |
US5796844A (en) * | 1996-07-19 | 1998-08-18 | Lexicon | Multichannel active matrix sound reproduction with maximum lateral separation |
WO2000004744A1 (en) | 1998-07-17 | 2000-01-27 | Lucasfilm Ltd. | Multi-channel audio surround system |
-
1998
- 1998-05-05 US US09/072,707 patent/US6624873B1/en not_active Expired - Lifetime
-
1999
- 1999-04-15 AR ARP990101746A patent/AR014987A1/en unknown
- 1999-04-30 WO PCT/US1999/009468 patent/WO1999057941A1/en active Application Filing
- 1999-04-30 DK DK99921562.7T patent/DK1077016T3/en active
- 1999-04-30 ES ES99921562T patent/ES2338391T3/en not_active Expired - Lifetime
- 1999-04-30 AU AU38744/99A patent/AU3874499A/en not_active Abandoned
- 1999-04-30 CA CA002330960A patent/CA2330960C/en not_active Expired - Lifetime
- 1999-04-30 JP JP2000547817A patent/JP4424849B2/en not_active Expired - Lifetime
- 1999-04-30 EP EP99921562A patent/EP1077016B1/en not_active Expired - Lifetime
- 1999-04-30 AT AT99921562T patent/ATE454018T1/en active
- 1999-04-30 DE DE69941870T patent/DE69941870D1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5046098A (en) * | 1985-03-07 | 1991-09-03 | Dolby Laboratories Licensing Corporation | Variable matrix decoder with three output channels |
US5583962A (en) * | 1991-01-08 | 1996-12-10 | Dolby Laboratories Licensing Corporation | Encoder/decoder for multidimensional sound fields |
US5508761A (en) * | 1993-12-07 | 1996-04-16 | Sony Corporation | Apparatus for reproducing a digital pattern from motion picture film, and the motion picture film |
US5717765A (en) * | 1994-03-07 | 1998-02-10 | Sony Corporation | Theater sound system with upper surround channels |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001087015A3 (en) * | 2000-05-10 | 2003-02-27 | Digital Theater Syst Inc | Discrete multichannel audio with a backward compatible mix |
JP2003533154A (en) * | 2000-05-10 | 2003-11-05 | デジタル・シアター・システムズ・インコーポレーテッド | Discrete multi-channel audio with mixed compatibility |
US7212872B1 (en) | 2000-05-10 | 2007-05-01 | Dts, Inc. | Discrete multichannel audio with a backward compatible mix |
KR100736640B1 (en) * | 2000-05-10 | 2007-07-09 | 디티에스, 인코포레이티드 | Discrete multichannel audio with a backward compatible mix |
JP4860088B2 (en) * | 2000-05-10 | 2012-01-25 | ディー・ティー・エス,インコーポレーテッド | Discrete multi-channel audio with mixed compatibility |
US8280743B2 (en) | 2005-06-03 | 2012-10-02 | Dolby Laboratories Licensing Corporation | Channel reconfiguration with side information |
WO2009089209A1 (en) * | 2008-01-11 | 2009-07-16 | Dolby Laboratories Licensing Corporation | Matrix decoder |
CN101911731B (en) * | 2008-01-11 | 2012-12-05 | 杜比实验室特许公司 | Matrix decoder |
AU2009204238B2 (en) * | 2008-01-11 | 2013-04-04 | Dolby Laboratories Licensing Corporation | Matrix decoder |
US8488798B2 (en) | 2008-01-11 | 2013-07-16 | Dolby Laboratories Licensing Corporation | Matrix decoder |
Also Published As
Publication number | Publication date |
---|---|
JP2002514827A (en) | 2002-05-21 |
AR014987A1 (en) | 2001-04-11 |
CA2330960C (en) | 2007-09-25 |
EP1077016A1 (en) | 2001-02-21 |
DK1077016T3 (en) | 2010-04-26 |
AU3874499A (en) | 1999-11-23 |
ATE454018T1 (en) | 2010-01-15 |
DE69941870D1 (en) | 2010-02-11 |
ES2338391T3 (en) | 2010-05-06 |
JP4424849B2 (en) | 2010-03-03 |
EP1077016B1 (en) | 2009-12-30 |
CA2330960A1 (en) | 1999-11-11 |
US6624873B1 (en) | 2003-09-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6624873B1 (en) | Matrix-encoded surround-sound channels in a discrete digital sound format | |
US7212872B1 (en) | Discrete multichannel audio with a backward compatible mix | |
US6760448B1 (en) | Compatible matrix-encoded surround-sound channels in a discrete digital sound format | |
Gerzon | Surround-sound psychoacoustics | |
AU2001259641A1 (en) | Discrete multichannel audio with a backward compatible mix | |
US6154545A (en) | Method and apparatus for two channels of sound having directional cues | |
US20060165247A1 (en) | Ambient and direct surround sound system | |
US20020006206A1 (en) | Center channel enhancement of virtual sound images | |
JP5496235B2 (en) | Improved reproduction of multiple audio channels | |
JPH09289700A (en) | 5-2-5 matrix system | |
US5261005A (en) | Sound field control device | |
JPS5814799B2 (en) | Stereo on size | |
Davis | History of spatial coding | |
US6198827B1 (en) | 5-2-5 Matrix system | |
JP4478220B2 (en) | Sound field correction circuit | |
CA1100881A (en) | Sound system apparatus and format | |
EP0119101B1 (en) | Improvements in stereophonic motion picture photographic sound-tracks and apparatus for recording and playing back photographic sound tracks | |
JPH11176101A (en) | Pseudo-multichannel stereo reproducing device | |
WO2000004744A1 (en) | Multi-channel audio surround system | |
Griesinger | Surround: The current technological situation | |
RU2779295C2 (en) | Processing of monophonic signal in 3d-audio decoder, providing binaural information material | |
Eargle et al. | Multichannel Stereo | |
JP2003244798A (en) | Stereo signal processing apparatus | |
KR970005609B1 (en) | Method for regenerating voice and sound | |
Robjohns | You are surrounded |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AL AM AT AT AU AZ BA BB BG BR BY CA CH CN CU CZ CZ DE DE DK DK EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1999921562 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2000 547817 Country of ref document: JP Kind code of ref document: A Ref document number: 2330960 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1999921562 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |