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Real-time control of playback rates in presentations
| Details |
Inventors: Chang, Kenneth H. P.;
Assignee: SSI Corporation (Tokyo, JP)
Primary Examiner: Young; W. R.
Assistant Examiner: Vo; Huyen X.
Attorney, Agent or Firm: Millers; David T.
Media encoding, transmission, and playback processes and structures employ a multi-channel architecture with different audio channels corresponding to different playback rates for a presentation to be transmitted over a network. Audio frames in the various audio channels all correspond to the same amount of time in the original presentation and have frame indexes that identify in the different audio channels the frames corresponding to the same time interval in the presentation. A user can make a real-time change in playback rate causing selection of a channel corresponding to the new playback rate and a frame required for prompt and smooth transition in the playback rate of the presentation. The architecture can additionally provide channels for graphics data such as image data that are displayed according to the index of the audio, and different audio channels with the same playback rate but different compression schemes for use according to available bandwidth on the network. |
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DETAILED DESCRIPTION In accordance with an aspect of the invention, media encoding, network transmission, and playback processes and structures use a multi-channel architecture with different channels corresponding to different playback rates or time scales of a portion of a presentation.
An encoding process for the presentation uses multiple encodings of the same portion such as the audio portion of the presentation.
Accordingly, different channels have different encodings for different playback rates or time scales, even though the different channels represent the same portion of the presentation.
A receiver or user of the presentation can select the playback rate or time scale and thereby selects use of a channel corresponding to that time scale.
The receiver does not require a complex decoder or a powerful processor to achieve the desired time scale because the selected channel contains information pre-encoded for the selected time scaling.
Additionally, the required network bandwidth does not increase as in systems were the receiver performs time scaling because pre-encoding or time scaling of audio data removes redundant audio data before transmission.
Accordingly, bandwidth requirements can remain constant regardless of the time scale.
Each channel contains a series of frames that are indexed according to the order of the presentation, and when a user changes from one channel to another, the frame from the new channel can be identified and transmitted when required for continuous uninterrupted play of the presentation.
In an exemplary embodiment, corresponding audio frames in different audio channels correspond to the same amount of time in the presentation when played at normal speed and have frame indices that identify the frames as corresponding to particular time intervals in the presentation.
A user can change a playback rate causing selection and transmission of a frame from a channel corresponding to the new playback rate, and the user receives the frame when required for a real-time transition in the playback rate of the presentation
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