EP1329103A2 - Dispositif de lecture video servant a reproduire a vitesse variable une video preenregistree sans distorsion tonique - Google Patents

Dispositif de lecture video servant a reproduire a vitesse variable une video preenregistree sans distorsion tonique

Info

Publication number
EP1329103A2
EP1329103A2 EP01980443A EP01980443A EP1329103A2 EP 1329103 A2 EP1329103 A2 EP 1329103A2 EP 01980443 A EP01980443 A EP 01980443A EP 01980443 A EP01980443 A EP 01980443A EP 1329103 A2 EP1329103 A2 EP 1329103A2
Authority
EP
European Patent Office
Prior art keywords
video
audio track
receiving
processor
playback device
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Withdrawn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
EP01980443A
Other languages
German (de)
English (en)
Inventor
Eran Sitnik
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP1329103A2 publication Critical patent/EP1329103A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/781—Television signal recording using magnetic recording on disks or drums
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/84—Television signal recording using optical recording
    • H04N5/85—Television signal recording using optical recording on discs or drums
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
    • H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals

Definitions

  • Video playback device for variable speed play back of pre-recorded video without pitch distortion of audio
  • the present invention is directed, in general, to video playback devices and, more specifically, to a system for playing back video in fast forward mode and slow mode without pitch distortion of the audio track.
  • video playback devices are available in the marketplace. Most people own, or are familiar with, a video cassette recorder (NCR), also referred to as a video tape recorder (VTR). More recently, video recorders that use computer magnetic hard disks rather than magnetic cassette tapes to store video programs have appeared in the market. For example, the ReplayTV recorder and the TiNO recorder digitally record television programs on hard disk drives using, for example, MPEG-2 compression. Additionally, some video playback devices may record on a readable/writable digital versatile disk (DND) rather than a magnetic disk.
  • DND digital versatile disk
  • a primary object of the present invention to provide, for use in a video playback device capable of playing back a video program, in fast forward mode and slow mode, on a television set coupled to the video playback device, an apparatus for playing back an audio track associated with the video program during the fast forward mode and the slow mode.
  • the apparatus comprises: 1) a video playback controller capable of receiving a user input command indicating a relative amount of acceleration of the video program during the fast forward mode; 2) an audio processor capable of receiving the audio track and compressing a duration of the audio track with minimal pitch distortion, wherein the compression is proportional to the relative amount of acceleration of the video program; and 3) a video processor coupled to audio processor capable of receiving the compressed audio track and capable of receiving an accelerated video signal associated with the video program during the fast forward mode, wherein the video processor transmits the compressed audio track and the accelerated video signal in synchronization to the television set.
  • the video playback controller is capable of receiving a user input command indicating a relative amount of deceleration of the video program during the slow mode and the audio processor is capable of expanding a duration of the audio track with minimal pitch distortion, wherein the expansion is proportional to the relative amount of deceleration of the video program.
  • the video processor is capable of receiving the expanded audio track and a decelerated video signal associated with the video program during the slow mode, wherein the video processor transmits the expanded audio track and the decelerated video signal in synchronization to the television set.
  • the apparatus further comprises a memory coupled to the audio processor capable of storing executable instructions associated with at least one compression algorithm.
  • the memory is capable of storing executable instructions associated with at least one expansion algorithm.
  • controller may be centralized or distributed, whether locally or remotely.
  • a controller may comprise one or more data processors, and associated input/output devices and memory, that execute one or more application programs and/or an operating system program.
  • Fig. 1 illustrates an exemplary video playback device and a television set according to one embodiment of the present invention
  • Fig. 2 illustrates in greater detail the exemplary video playback device according to one embodiment of the present invention.
  • Fig. 3 is a flow diagram illustrating the operation of the exemplary video playback device according to one embodiment of the present invention.
  • FIGs. 1 through 3 discussed below, and the various embodiments used to describe the principles of the present invention in this patent document are by way of illustration only and should not be construed in any way so as to limit the scope of the invention. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged video playback device.
  • Fig. 1 illustrates exemplary video playback device 150 and television set 105 according to one embodiment of the present invention.
  • Video playback device 150 receives incoming television signals from an external source, such as a set-top box of a cable television service provider (Cable Co.) or the phone company, a local antenna, the Internet, or an attached DVD or VHS tape player, and transmits a viewer-selected channel to television set 105.
  • video playback device 150 may demodulate an incoming radio frequency (RF) television signal to produce a baseband video signal that is recorded and stored on a storage medium within or connected to video playback device 150.
  • RF radio frequency
  • PLAY mode video playback device 150 reads a stored baseband video signal (i.e., program) selected by the user from the storage medium and transmits it to television set 105.
  • video playback device 150 is a video cassette recorder (VCR), also referred to as a video tape recorder (VTR), video playback device 150 stores and retrieves the incoming television signals to and from a magnetic cassette tape.
  • video playback device 150 is a disk drive-based device, such as a ReplayTV recorder or a TiVO recorder, video playback device 150 stores and retrieves the incoming television signals to and from a computer magnetic hard disk rather than a magnetic cassette tape.
  • video playback device 150 may store and retrieve from a local read/write (R/W) digital versatile disk (DVD) or R/W CD-ROM.
  • the local storage medium may be fixed (i.e., hard disk drive) or removable (i.e., DVD, CD-ROM, VCR tape).
  • Video playback device 150 comprises infrared (IR) sensor 160 that receives commands (such as Channel Up, Channel Down, Volume Up, Volume Down, Record, Play, Fast Forward (FF), Reverse, and the like) from a remote control device operated by the viewer.
  • Television set 105 is a conventional television comprising screen 110, infrared (IR) sensor 115, and one or more manual controls 120 (indicated by a dotted line).
  • IR sensor 115 also receives commands (such as volume up, volume down, power ON/OFF) from a remote control device operated by the viewer. It should be noted that video playback device 150 is not limited to receiving a particular type of incoming television signal from a particular type of source.
  • the external source may be a cable service provider, a conventional RF broadcast antenna, a satellite dish, an Internet connection, or another local storage device, such as a DVD player or a VHS tape player.
  • video playback device 150 may not even be able to record, but may be limited to playing back television signals that are retrieved from a removable DVD or CD-ROM.
  • the incoming signal may be a digital signal, an analog signal, or Internet protocol (IP) packets of any other communication protocol.
  • IP Internet protocol
  • the descriptions that follow shall generally be directed to an embodiment in which video playback device 150 receives incoming television signals (analog and/or digital) from a cable service provider. Nonetheless, those skilled in the art will understand that the principles of the present invention may readily be adapted for use with wireless broadcast television signals, local storage systems, an incoming stream of IP packets containing MPEG data, and the like.
  • Fig. 2 illustrates exemplary video playback device 150 in greater detail according to one embodiment of the present invention.
  • Video playback device 150 comprises IR sensor 160, video processor 210, MPEG2 encoder 220, hard disk drive 230, MPEG2 decoder/NTSC encoder 240, and video recorder (VR) controller 250.
  • Video playback device 150 further comprises video buffer 260, audio compression/expansion processor 270, and compression/ expansion algorithms 280, which may be embodied as a memory that stores one or more of a number of well-known audio compression and audio expansion algorithms as a sequence of program instructions executed by audio compression/expansion processor 270. Audio compression and expansion techniques may be used to play back an audio signal with low pitch distortion or minimal pitch distortion.
  • United States Patent No. 5,694,521 to Shlomot et al. entitled “Variable Speed Playback System.”
  • United States Patent Nos. 5,386,493, 5,479,564 and 5,694,521 are hereby incorporated by reference into the present disclosure as if fully set forth herein.
  • one or more of the compression/expansion algorithms disclosed in United States Patent Nos. 5,386,493, 5,479,564 and 5,694,521 may be stored in compression/expansion algorithms 280 and executed by audio compression/expansion processor 270.
  • VR controller 250 directs the overall operation of video playback device 150, including View mode, Record mode, Play mode, Fast Forward (FF) mode, Reverse mode, among others.
  • View mode VR controller 250 causes the incoming television signal from the cable service provider to be demodulated and processed by video processor 210 and transmitted to television set 105, without storing or retrieving from hard disk drive 230.
  • Video processor 210 which may be, for example, a TriMedia (TM) 1100 media processor, contains radio frequency (RF) front-end circuitry for receiving incoming television signals from the cable service provider, tuning to a user-selected channel, and converting the selected RF signal to a baseband television signal (e.g., super video signal) suitable for display on television set 105.
  • TM TriMedia
  • RF radio frequency
  • Video processor 210 also is capable of receiving a conventional NTSC, PAL or SECAM signal from MPEG2 decoder/NTSC encoder 240 (after buffering in video buffer 260) during Play mode and transmitting baseband television signal (e.g., super video signal) to television set 105.
  • baseband television signal e.g., super video signal
  • VR controller 250 causes the incoming television signal to be stored on hard disk drive 230.
  • MPEG2 encoder 220 receives the incoming television signal from the cable service provider and converts the received RF signal to MPEG format for storage on hard disk drive 230.
  • VR controller 250 directs hard disk drive 230 to stream the stored television signal (i.e., program) to MPEG2 decoder/NTSC encoder 240, which converts the MPEG2 data from hard disk drive 230 to, for example, a super video (S-Video) signal that is buffered in video buffer 260 before video processor 210 transmits it to television set 105.
  • S-Video super video
  • MPEG2 encoder 220 and MPEG2 decoder/NTSC encoder 240 are by way of illustration only.
  • the MPEG encoder and decoder may comply with one or more of the MPEG-1, MPEG-2, MPEG-4, and MPEG-7 standards.
  • hard disk drive 230 is defined to include any mass storage device that is both readable and writable, including conventional magnetic disk drives, magnetic tapes for a video cassette recorder (VCR) or video tape recorder (NTR), and optical disk drives for read/write digital versatile disks (DVD-RW), re-writable CD-ROMs, and the like.
  • hard disk drive 230 need not be fixed in the conventional sense that is permanently embedded in video playback device 150. Rather, hard disk drive 230 includes any mass storage device that is dedicated to video playback device 150 for the purpose of storing recorded video and audio programs.
  • hard disk drive 230 may include an attached peripheral drive or removable disk drives (whether embedded or attached), such as a juke box device that holds read/write DVDs or rewritable CD-ROMs.
  • hard disk drive 230 may include external mass storage devices that video playback device 150 may access and control via a network connection (e.g., Internet protocol (IP) connection), including, for example, a disk drive in the user's home personal computer (PC) or a disk drive on a server at the user's Internet service provider (ISP).
  • IP Internet protocol
  • VR controller 250 may receive a Fast Forward (FF) command from a user via IR sensor 160.
  • FF Fast Forward
  • video playback device 150 is capable of playing selected portions of the audio signal with minimum pitch distortion using video buffer 260, audio compression/expansion processor 270, and compression expansion algorithm 280.
  • VR controller 250 causes hard disk drive 230 and MPEG2 decoder/NTSC encoder 240 to play video at a faster forward speed.
  • VR controller 250 also directs video processor 210 to stop receiving the audio output of MPEG2 decoder/NTSC encoder 240 as a source of the audio signal. Instead, video processor 210 is switched to receive the audio signal from the output of audio compression/expansion processor 270 as the source of the audio signal.
  • FIG. 3 depicts flow diagram 300, which illustrates the operation of exemplary video playback device 150 according to one embodiment of the present invention.
  • a fast forward or slow mode input command is received during play mode by VR controller 250.
  • VR controller 250 determines the rate of acceleration or deceleration from the user input (process step 305).
  • a duration of the audio track is compressed with minimal pitch distortion.
  • the corresponding video is buffered in video buffer 260.
  • the compression is directly proportional to the relative amount of acceleration or deceleration of the video program (process step 310).
  • Audio compression/expansion processor 270 receives the audio track from the played back video from audio compression/expansion processor 270. Audio is expanded for slow play and compressed for fast forward mode. Expansion or compression is proportional to the rate of deceleration or acceleration selected by the user (process step 315). Compressed or expanded audio is transferred to a television set, in synchronization with a corresponding portion of fast forward or slow play video from video buffer 260 (process step 320).
  • Audio compression/expansion algorithms are utilized to adjust the audio signal according to the playback rates. As the playback rate increases, audio compression increases. As the playback rate decreases, the algorithms cause the compression rate to decrease. As the playback rate slows below normal, the audio expansion rate increases. The rates of audio compression and expansion are directly proportional to the playback speeds.

Abstract

L'invention concerne un dispositif conçu pour être utilisé dans un dispositif de lecture vidéo servant à reproduire un programme vidéo en mode d'avance rapide et en mode lent sur un poste de télévision couplé à ce lecteur vidéo, et servant à lire une piste audio associée au programme vidéo pendant le mode d'avance rapide et le mode lent. Ce dispositif comprend: 1) un contrôleur de lecture vidéo servant à recevoir une instruction d'entrée d'utilisateur indiquant un niveau relatif d'accélération du programme vidéo pendant le mode d'avance rapide; 2) un processeur audio servant à recevoir la piste audio et à comprimer une durée de cette piste audio, tout en minimisant la distorsion tonique, cette compression étant proportionnelle au niveau relatif d'accélération du programme vidéo; 3) un processeur vidéo couplé au processeur audio afin de recevoir la piste audio comprimée et capable de recevoir un signal vidéo accéléré associé au programme vidéo pendant le mode d'avance rapide, ce processeur vidéo transmettant la piste vidéo comprimée et le signal vidéo accéléré de façon synchrone par rapport au poste de télévision.
EP01980443A 2000-10-11 2001-09-26 Dispositif de lecture video servant a reproduire a vitesse variable une video preenregistree sans distorsion tonique Withdrawn EP1329103A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US686600 1991-04-17
US68660000A 2000-10-11 2000-10-11
PCT/EP2001/011142 WO2002032126A2 (fr) 2000-10-11 2001-09-26 Dispositif de lecture video servant a reproduire a vitesse variable une video preenregistree sans distorsion tonique

Publications (1)

Publication Number Publication Date
EP1329103A2 true EP1329103A2 (fr) 2003-07-23

Family

ID=24756978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980443A Withdrawn EP1329103A2 (fr) 2000-10-11 2001-09-26 Dispositif de lecture video servant a reproduire a vitesse variable une video preenregistree sans distorsion tonique

Country Status (5)

Country Link
EP (1) EP1329103A2 (fr)
JP (1) JP2004511970A (fr)
KR (1) KR20020062752A (fr)
CN (1) CN1404690A (fr)
WO (1) WO2002032126A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8032360B2 (en) * 2004-05-13 2011-10-04 Broadcom Corporation System and method for high-quality variable speed playback of audio-visual media
KR101039107B1 (ko) * 2008-12-22 2011-06-07 박의봉 골전도 이어폰

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386493A (en) * 1992-09-25 1995-01-31 Apple Computer, Inc. Apparatus and method for playing back audio at faster or slower rates without pitch distortion
US5583652A (en) * 1994-04-28 1996-12-10 International Business Machines Corporation Synchronized, variable-speed playback of digitally recorded audio and video
EP1161089B1 (fr) * 1995-09-11 2003-12-17 Matsushita Electric Industrial Co., Ltd. Appareil d'enregistrement et de reproduction de signal vidéo
KR0165439B1 (ko) * 1995-09-14 1999-03-20 김광호 디지탈 비디오 테이프 레코더의 화면 구성 장치 및 방법
KR100242448B1 (ko) * 1997-06-28 2000-02-01 윤종용 디지털 비디오 디스크 고속 재생 제어장치 및 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0232126A2 *

Also Published As

Publication number Publication date
JP2004511970A (ja) 2004-04-15
WO2002032126A2 (fr) 2002-04-18
KR20020062752A (ko) 2002-07-29
CN1404690A (zh) 2003-03-19
WO2002032126A3 (fr) 2002-07-04

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