EP1089279A2
Expired / Lapsed
EP
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Synchronisation of multiple media streams
Assignee: Avid Technology Inc
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Filing: 1994-04-18
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Granted: —
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Expires: 2014-04-18
Abstract
Abstract A method of synchronizing digitized audio information (113) and digitized picture information (105) establishes a reference time base (109) based on timecodes (107 & 117) included with the audio and picture information. The reference time base may be used to synchronize output between a digitized source and one which may be digitized or undigitized.
Inventors
- 👤 Michael E. Phillips
- 👤 Patrick O'connor
- 👤 Eric Peters
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:43
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G11B27/002; G11B27/06; G11B27/10; G11B27/11; G11B27/19; G11B27/24; G11B27/28; G11B27/32; G11B27/322; G11B27/323; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9265; H04N5/9267; G11B2220/00; G11B2220/20; G11B2220/90; H04N5/84; H04N5/85
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A method for synchronizing a clip including a stream of digitized
audiovisual data, a reference time base and an audio-visual data time base, with a
film source to be cut, the film source including time information corresponding to
the audiovisual data time base, comprising the steps of: reading the time information from the film source while a portion
thereof is being viewed; decoding the time information read, so as to produce a stream of
picture timecodes; determining where in the clip the portion of the film source is located; moving the film source to vary the portion of the film source being
viewed; and indicating to an operator that the portion of the film source being
viewed is an end of the clip at which the film source should be cut.
Claim 2
Dependent Claim
16 words
The method of claim 1, wherein the time information includes machine
readable timecodes on the film.
Claim 3
Dependent Claim
49 words
The method of claim 1, wherein the time information includes a
bi-phase signal and the step of decoding further comprises the steps of: determining as a beginning timecode an arbitrary timecode; a nd converting the bi-phase signal into the stream of picture tim ecodes
beginning with the arbitrary timecode.
Claim 4
Dependent Claim
41 words
The method of claim 1, wherein the step of reading further comprises
the steps of: reading a coded frame number from the film source; and reading a continuous position indication from a shaft encoder through
which the film source is threaded.
Claim 5
Independent Claim
170 words
A method for synchronizing a digitized audio signal including audio
timecodes with a film source, comprising the steps of: reading time information from the film source while being projected; decoding the time information read, so as to produce a stream of
picture timecodes; creating a digital reference time base signal beginning at a reference
time zero and including periodic timing information synchronous with the picture
timecodes; creating an association of the reference time zero with a first audio
timecode; reproducing the digitized audio signals in synchronism with the
reference time base signal, by holding constant during the step of reproducing a
relationship between the reference timebase and the audio timecodes established
by the step of creating an association, whereby audio is reproduced in synchronism
with the film source, wherein the time information includes a bi-phase signal and the step
of decoding further comprises the steps of: determining as a beginning timecode an arbitrary timecode; and converting the bi-phase signal into the stream of picture timecodes
beginning with the arbitrary timecode.
Claim 6
Dependent Claim
16 words
The method of claim 5, wherein the time information includes machine
readable timecodes on the film.
Claim 7
Dependent Claim
41 words
The method of claim 5, wherein the step of reading further comprises
the steps of: reading a coded frame number from the film source; and reading a continuous position indication from a shaft encoder through
which the film source is threaded.
Claim 8
Dependent Claim
227 words
Apparatus for synchronizing an audio-visual clip including a stream of
digitized picture data including a stream of picture timecodes and a stream of
digitized audio data including a stream of audio timecodes, the stream of picture
timecodes having a first time resolution and the stream of audio timecodes having
a second time resolution, the method comprising: a plurality of media digitizers, each including a corresponding time
information decoder; and each having an output including a stream of digitized
media data and a stream of timecodes; a memory for storing the streams of digitized media data and the
stream of timecodes; means for creating a digital reference time base signal beginning at a
reference time zero and including periodic timing information synchronous with one
of the stream of picture timecodes and the stream of audio timecodes, the
reference time base having a third time resolution; means for creating an association of another of the stream of picture
timecodes and the stream of audio timecodes with the reference time base; and means for storing the clip as a track group synchronous over the range
of time of coincidence, the digitized stream of picture data including the picture
timecodes, the digitized stream of audio data including the audio timecodes and the
reference time base signal including the association created, wherein at least one time information decoder includes a bi-phase
decoder.
Claim 9
Dependent Claim
22 words
The apparatus of claim 8, wherein at least one time information
decoder includes: a frame number reader; and a shaft position encoder.
Claim 10
Independent Claim
172 words
A method for synchronizing a digitized audio signal including
audio timecodes with a film source, comprising the steps of: reading time information from the film source while being projected; decoding the time information read, so as to produce a stream of picture
timecodes; creating a digital reference time base signal beginning at a reference time
zero and including periodic timing information synchronous with the picture
timecodes; creating an association of the reference time zero with a first audio
timecode; reproducing the digitized audio signals in sychronism with the reference
time base signal, by holding constant during the step of reproducing a
relationship between the reference time base and the audio timecodes
established by the step of creating an association, whereby audio is reproduced
in synchronism with the film source, and wherein the time information includes a bi-phase signal and the step
of decoding further comprises the steps of: determining as a beginning timecode an arbitrary timecode; and converting the bi-phase signal into the stream of picture timecodes
beginning with the arbitrary timecode.
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