Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-02-19
2000-07-04
Le, Vu
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
348423, 348 17, H04B 166, H04N 712, H04N 714
Patent
active
060849118
ABSTRACT:
A data transmission method and apparatus, by which, when coded and compressed image data are transmitted in the form of packet composed of a fixed bit length, image data can be desirably transmitted, even though a band width given to image data is dynamically changed. The data transmission method mixes coded and compressed voice data and coded and compressed image data together, and transmits resultant data to a network in the form of packet composed of a fixed bit length. As a method, the process comprises the steps of: (a) trying to input voice data; (b) detecting a presence of voice data; (c) capturing image data at a predetermined capture interval; (d) coding and compressing the captured image data at a predetermined compression rate; (e) coding and compressing the voice data upon a detection at the step (b), mixing resultant voice data with resultant image data, and dividing mixed data into packets; (f) transmitting packets; (g) predicting a presence of voice data in a near future in accordance with more than one previous result of the detection at the step (b); and (h) adjusting the predetermined capture interval at the step (c) in accordance with a prediction at the step (g).
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International Business Machines - Corporation
Le Vu
McConnell Daniel E.
McKinley Martin J.
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