EP1224734A1 - Systeme de commande d'enregistrement et de restitution - Google Patents

Systeme de commande d'enregistrement et de restitution

Info

Publication number
EP1224734A1
EP1224734A1 EP99950227A EP99950227A EP1224734A1 EP 1224734 A1 EP1224734 A1 EP 1224734A1 EP 99950227 A EP99950227 A EP 99950227A EP 99950227 A EP99950227 A EP 99950227A EP 1224734 A1 EP1224734 A1 EP 1224734A1
Authority
EP
European Patent Office
Prior art keywords
data
information
playback system
recording
acoustic control
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.)
Withdrawn
Application number
EP99950227A
Other languages
German (de)
English (en)
Other versions
EP1224734A4 (fr
Inventor
George Lydecker
Alan J. Mcpherson
Edwin Outwater, Iii
Gregory Thagard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Warner Music Group Inc
Original Assignee
Warner Music Group Inc
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.)
Filing date
Publication date
Application filed by Warner Music Group Inc filed Critical Warner Music Group Inc
Publication of EP1224734A1 publication Critical patent/EP1224734A1/fr
Publication of EP1224734A4 publication Critical patent/EP1224734A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing

Definitions

  • This invention relates to systems for recording and playing back audio information on optical recording media.
  • it relates to such systems that compensate for the differences between the characteristics of the recording and playback sites.
  • the present invention is concerned with apparatus and methods for playing back recorded material from media, particularly, but not strictly limited to high density optical recording media such as DVD discs containing acoustic data, e.g., music.
  • music is to be understood throughout to include the possibility of video.
  • a serious limitation of the present systems is that they record music in a studio or a concert hall and leave it to the listener/viewer (herein termed the "listener") to adjust the playback apparatus to attempt to reproduce the artist's intended sound in a different playback site, i.e., his home, or car.
  • the listening and playback sites almost always have different acoustic characteristics, it is not feasible for the listener satisfactorily to manage the adjustment of the playback equipment.
  • the present invention provides a system for recording and reading audio visual control data (herein termed "acoustic control data”), together with the musical program data, and playing back the program data in accordance with the acoustical control data to optimize performance of audio reproduction and recreate the original acoustic environment.
  • acoustic control data audio visual control data
  • the acoustic control data includes several parameters and may be used to adjust the operation of the playback system as accurately and as often as desired, down to millisecond intervals.
  • the system of the invention comprises a recording apparatus, a playback apparatus and a high density digital recording media, such as DVD.
  • the recording apparatus comprises in addition to the standard equipment, a precision microphone, a controller, a test signal generator and a data multiplexer to produce recording media having both the acoustic control information and the audio data.
  • the playback system comprises a demultiplexer, a customer input interface giving the user some ability to override the otherwise automatic parameter adjustments, optionally a metadata display system that takes information about the physical arrangement of instruments in the recording studio and makes that information visually available to the listener, and a register that identifies the characteristics of the playback apparatus.
  • the playback apparatus further includes data processing components for processing the acoustic program data, these components being dynamically controlled using the acoustic control data.
  • An open and closed loop control scheme is also provided.
  • the open loop scheme the acoustic characteristics of local playback site are provided to the playback apparatus by the listener at the playback apparatus.
  • the closed loop control scheme the acoustic parameters of the playback site are automatically determined, by generating acoustical test signals and sensing the responses. In either case, the characteristics of the recording and playback sites are compared and used to control the operation of the playback components.
  • the playback apparatus may also include a noise cancellation circuit which receives special information of the acoustic program data from the recording site.
  • Figure 1 shows a block diagram for the recording apparatus
  • Figure 2 shows a typical sector on a recording media in accordance with the invention
  • FIG. 3 shows a block diagram of the playback apparatus
  • Figure 4 shows details of the delay circuit
  • Figure 5 shows a block diagram for the closed loop control configuration
  • Figure 6 shows a block diagram for a noise cancellation circuit in accordance with the present invention.
  • This preferred embodiment of the present system concerns the generation and replaying of audio data recorded on a pure audio DVD (digital versatile disk).
  • the DVD is an optical recording disc medium having very high data density and MPEG compression of the audio data.
  • the system consists, in addition to the DVD, of a recording apparatus, which herein shall refer to collectively all the equipment involved in generating a DVD media having data representative of a live performance of music or other similar perform- ing activity, and a playback apparatus in which the data from the DVD is reproduced for the listening pleasure of a customer.
  • the recording apparatus 10 is disposed at a recording site or venue. It includes a plurality of primary microphones 12 used for picking up sounds generated during the performing activity. The signals generated by these microphones 12 are fed to a multichannel recorder 14. The signals may be stored in the recorder 14, for later processing or may be fed immediately to a mixer 16. The mixer 16 combines these signals into a multi-channel and stereo stream of audio data, which for the sake of simplicity, shall be referred to as the program data.
  • a data generator 18 determines the acoustic conditions of the recording venue and/or control room for the performance and stores the same in a memory 20.
  • the gen- erator 18 activates a test signal generator 22 which in response generates a predetermined test signal to an auxiliary speaker 24.
  • a precision microphone 17 senses the response at the recording locale to the test signal and sends the same to generator 18 and stores it in memory 20.
  • the recording locale (or venue) is the actual zone where the performance takes place.
  • the data generator 18 also receives mixing information from the mixer 16 and stores the same in memory
  • the producer of the performance may enter specific data regarding the reproduction of the performance to memory 20 via a keyboard 26. All of this information shall be referred to collectively as acoustical control data.
  • the acoustical control data stored in memory 20 is interleaved with the audio information on the DVD as described more fully below and is used during the playing of the DVD, either to recreate the conditions under which the recording was made and/or other conditions selected by the producer.
  • the memory 20 contains information descriptive of the acoustic characteristic of the room where the recording occurs. Of course these characteristics are dependent on the size of the room, the composition of the wall coverings, the height, etc, all of which affect how the sounds are recorded.
  • the producer may desire to change some of these characteristics. This is especially desirable if when multichannel signals are folded down to generate two-channel stereo sounds.
  • the producer has the ability to define the fold down characteristics using keyboard 26.
  • the producer may optionally also provide to the data generator various other parameters. Alternatively, this information may be provided automatically from the mixer 16, the recording equipment or another microphone. Some of these parameters are: instrumental placement; instrument separation partition placement; peak or RMS limiting in the mixer 16; equalization, compression and other similar recording information; studio and/or control room dynamic data such as reverb time, delay time, standing waves, ambient noise; room frequency response, room dynamic information; etc.
  • the acoustical visual control data, or AVCD is fed to multiplexer 28 which combines the program data with this AVCD and feeds the same to a formatter 30. Formatter 30 partitions the combined data and, if necessary, adds additional data including for example parity codes, error correction codes, etc., in conformance with a particular DVD standard used. The resulting data is recorded on a DVD by a recording device 32.
  • a typical data sector 40 shown in Figure 2 consists of a header portion 42 and a data portion 44.
  • the data portion 44 which normally is reserved to the actual program data is 2048 bytes and the header portion 42, which carries other types of signals and contains 156 bytes.
  • a small section 46 is carved out, preferably of the data portion 44, as shown, and dedicated for the AVCD signals. In Figure 2, section 46 is shown at the beginning of the data portion 44, however it may be disposed at other locations as well.
  • AVCD is shown as being provided in a sector 40, it should be understood that this data need not be repeated in every sector. Instead, the AVCD may be provided in every sector on the DVD or, in an ultimate case, once for each DVD.
  • this playback apparatus 50 includes a demultiplexer 52, an AVCD buffer 54 for the AVCD signal and a buffer 56 for the program data.
  • the demultiplexer 52 separates the AVCD and the program data for the respective buffers 54, 56 from the incoming data as it is read off the DVD. It also reads the header information and performs other control functions, such as error correction, which do not form a part of this invention.
  • a DVD player which shows details of such a demultiplexer is disclosed in U.S. Patent No. 5,463,565, incorporated herein by reference.
  • player 50 is a multichannel audio DVD player capable of generating six channels. (Such players are commonly referred to as generating 5.1 channels, the last channel being dedicated to a low frequency subwoofer.)
  • the program data from buffer 56 is fed via six lines L1-L6, to six processing channels.
  • Typical processing circuits are shown in Figure 3 for one channel, it being understood that the elements for the other channels are substantially identical.
  • the program on LI is fed first to a gain/phase circuit 58 for amplification, gain adjustment and phase correction in accordance with certain control signals as described below.
  • the adjusted signals are sent to a delay/reverberation circuit 60 where the delay of the signals for appropriate reverberation are adjusted.
  • the signals are next sent to an equalizer 62.
  • the signals are sent to a multiplexer 64.
  • the operation of the multiplexer 64 is dependent on the number and arrangement of speakers that the costumer wants to use. For a full 5.1 channel surround sound, the multiplexer sends the signals to an appropriate speaker 66, it being understood that similar speakers are provided for each of the other channels.
  • the multiplexer 64 first sends the sounds for channel 1 to a mixer 68 on line ml .
  • This mixer 68 also receives signals on lines m2, m3 for signals from other channels. The signals from these channels are mixed at certain ratios described more fully below, to generate a 'left' signal for a speaker 70.
  • signals from lines m3, m4, m5 generated by other channels are fed to a second mixer 68' where they are combined to generate a so-called 'right' signal for a speaker 70'.
  • the two mixers 68, 68' fold the signals from six channels into a standard two-channel stereo signals.
  • the playback apparatus 50 further includes a customer input interface 80 and a register 82.
  • the customer input interface 80 is used by the customer to input his preferences, and, if so desired, to override the AVCD as described more fully below.
  • the register 82 is used by the manufacturer to store certain device specific information, such as whether the player is an automobile player, a home player, a personal or portable player, a studio player, and so on.
  • the goal of any sound player is to reproduce a recorded performance as accurately as possible by recreating the conditions under which it was recorded.
  • the acoustic characteristics of the playback site play an important role in the accuracy of the reproduction. These characteristics include the physical dimensions of the room where the playback apparatus is to be used, including characteristics of the walls, the location of the speakers, etc.
  • the playback apparatus 50 should have information descriptive of all these characteristics.
  • Two configurations are envisioned for providing these local characteristics to the playback apparatus 50.
  • an open loop control is used.
  • the customer provides the descriptive information to the playback apparatus 50. For example, in response to prompts, the customer may enter the size of the room, the location of the speakers, etc. This information is then stored in memory 83.
  • related acoustic parameters are also determined and stored in memory 83.
  • the information from memory 83 and register 82 is used by each of the elements 58, 60, 62, 64 in conjunction with the ACD information from buffer 54 to perform their respective functions. This feature of the invention is best explained in conjunction with a specific element.
  • Figure 4 shows details of the delay circuit 60.
  • the delay circuit 60 includes a programmable delay line 91 and a control block 92.
  • the control block receives a reference delay parameter which is one of the parameters of the AVCD and is determined at the recording site 10.
  • the control block also receives an input from register 82, or memory 83.
  • Control block 92 may be for example a look-up table which uses the information received to generate an appropriate delay for the signals of channel 1 , by comparing for example the delay characteristic of the room with the optimal delay indicated by the reference delay parameter.
  • This delay control signal is then fed to programmable delay line 91.
  • the original performance may have been recorded in a concert hall having a delay time of 2 seconds.
  • the customer may be keeping his player in relatively small room with a delay of 0.5 seconds. Therefore for optimum playing a delay of 1.5 sec is required.
  • This delay is developed by delay line 91 as defined by the control block
  • the customer may desire to have the sounds played with different characteristics. He may chose these characteristics using the customer interface 80. When the customer makes his choice, rather then having the system generate the delay automatically, the customer choice is fed to the controller block
  • each of the elements 58, 60, 62, 64 is adjusted using information from the AVCD, the register 82, memory 83 and the customer input interface 80.
  • a closed loop control system is used.
  • a control circuit 100 which includes ( Figure 5) a microphone 102, an amplifier 104, a processor 106, and test generator 108.
  • the test generator is used to generate on command a test signal.
  • the test generator may be used to generate pink noise, or a particular test sound defined by the AVCD. This test signal is transmitted to the speakers of the player 50.
  • the test may be identical to the test signal from generator 22.
  • the microphone 102 is located, at least temporarily, at a central location within the room wherever the customer prefers to listen to the player.
  • the microphone 102 is connected via the amplifier 104 to the processor 106 either by direct wiring or by an indirect coupling such as RF, IR, or other similar means.
  • the processor 106 routes the test signals from generator 108 to each of the speakers 66 serially and/or simultaneously to allow the processor to analyze the acoustic characteristics of the customer's listening room, including its size, wall covering, speaker locations, and so on.
  • the characteristics are obtained directly. These characteristics may have to be adjusted to compensate for changes in the room.
  • the AVCD may be used for other important information as well.
  • many high quality players especially players designed to be used in automobiles, may include a noise cancellation circuit for canceling road noise.
  • Noise cancellation may be advantageously incorporated into the present system as follows.
  • a noise cancellation circuit 140 includes a noise sensor 142, a noise correction generator 144 and a mixer 146.
  • Sensor 142 is used to sense ambient sounds and it may be for example a local microphone.
  • the noise signals thus sensed are fed to the noise correction generator 144.
  • the noise correction signal also receives from the AVCD information describing the spectral content of the program data on the corresponding channel, for example channel 1.
  • the noise correction generator 144 analyzes the sensed noise signals and generates noise compensation signals. In this manner, the noise correction generator 144 does not have to perform its own analysis to differentiate between the desirable sound signals and the undesirable noise signals.
  • These compensation signals are added to the program signals by mixer 146.
  • Mixer 146 in turn mixes the channel 1 signals and the noise correction signals to thereby compensate for noise.
  • the AVCD may include metadata descriptive of the locations of the instruments, vocalists and/or recording microphones. This information is captured and displayed by a display 90 at the playback apparatus to give the customer a more accurate information about how the performance was recorded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Stereophonic System (AREA)

Abstract

La présente invention concerne un système destiné à enregistrer et à restituer à la fois des données de programme et des données de commande acoustique et à lire les données afin d'optimiser la performance de reproduction audio et de recréer l'effet de l'environnement acoustique original. Le système comprend un appareil d'enregistrement (10), un appareil de restitution et un support d'enregistrement. L'appareil d'enregistrement (10) produit un support d'enregistrement comportant à la fois une information de commande acoustique et des données audio. L'appareil de restitution donne à l'utilisateur quelque possibilité d'ajuster lui-même certains paramètres automatiques. Eventuellement, un système d'affichage de métadonnées (90) capte l'information concernant l'arrangement physique d'instruments et d'autres caractéristiques de la session d'enregistrement et du studio d'enregistrement, et les rend visibles à l'auditeur. Un registre de type lecteur (82) identifie les caractéristiques du dispositif de restitution afin d'ajuster les caractéristiques du système de restitution.
EP99950227A 1999-10-06 1999-10-06 Systeme de commande d'enregistrement et de restitution Withdrawn EP1224734A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1999/023279 WO2001026220A1 (fr) 1999-10-06 1999-10-06 Systeme de commande d'enregistrement et de restitution

Publications (2)

Publication Number Publication Date
EP1224734A1 true EP1224734A1 (fr) 2002-07-24
EP1224734A4 EP1224734A4 (fr) 2004-11-17

Family

ID=22273757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99950227A Withdrawn EP1224734A4 (fr) 1999-10-06 1999-10-06 Systeme de commande d'enregistrement et de restitution

Country Status (6)

Country Link
EP (1) EP1224734A4 (fr)
JP (1) JP2003518262A (fr)
KR (1) KR20020062921A (fr)
AU (1) AU783180B2 (fr)
CA (1) CA2386625A1 (fr)
WO (1) WO2001026220A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040012115A (ko) * 2002-08-01 2004-02-11 주식회사 컴퓨터프로덕션 에코 및 입체 음향 지원 장치 및 방법
KR100745995B1 (ko) 2003-06-04 2007-08-06 삼성전자주식회사 메타 데이터 관리 장치 및 방법
JP4529513B2 (ja) * 2004-03-30 2010-08-25 ブラザー工業株式会社 音圧周波数特性調整装置、プログラム、楽曲再生装置
KR100754635B1 (ko) 2004-08-04 2007-09-05 삼성전자주식회사 통신 시스템에서의 전력 분배기/합성기
US7184557B2 (en) 2005-03-03 2007-02-27 William Berson Methods and apparatuses for recording and playing back audio signals
US9832590B2 (en) 2015-09-12 2017-11-28 Dolby Laboratories Licensing Corporation Audio program playback calibration based on content creation environment
CN111145773B (zh) * 2019-12-31 2022-10-11 思必驰科技股份有限公司 声场还原方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5863207A (ja) * 1981-10-13 1983-04-15 Matsushita Electric Ind Co Ltd 音響再生装置
DE4202609A1 (de) * 1991-01-30 1992-08-06 Samsung Electronics Co Ltd Schaltung und verfahren zur steuerung eines wiedergabeschallpegels in anpassung an einen hoerraum
US5590094A (en) * 1991-11-25 1996-12-31 Sony Corporation System and methd for reproducing sound

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647008A (en) * 1995-02-22 1997-07-08 Aztech Systems Ltd. Method and apparatus for digital mixing of audio signals in multimedia platforms
US5852800A (en) * 1995-10-20 1998-12-22 Liquid Audio, Inc. Method and apparatus for user controlled modulation and mixing of digitally stored compressed data

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5863207A (ja) * 1981-10-13 1983-04-15 Matsushita Electric Ind Co Ltd 音響再生装置
DE4202609A1 (de) * 1991-01-30 1992-08-06 Samsung Electronics Co Ltd Schaltung und verfahren zur steuerung eines wiedergabeschallpegels in anpassung an einen hoerraum
US5590094A (en) * 1991-11-25 1996-12-31 Sony Corporation System and methd for reproducing sound

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0071, no. 54 (E-185), 6 July 1983 (1983-07-06) & JP 58 063207 A (MATSUSHITA DENKI SANGYO KK), 15 April 1983 (1983-04-15) *
See also references of WO0126220A1 *

Also Published As

Publication number Publication date
CA2386625A1 (fr) 2001-04-12
AU783180B2 (en) 2005-09-29
WO2001026220A1 (fr) 2001-04-12
AU6293199A (en) 2001-05-10
EP1224734A4 (fr) 2004-11-17
KR20020062921A (ko) 2002-07-31
JP2003518262A (ja) 2003-06-03

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