Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-06-22
1991-05-14
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358340, 358463, 358330, H04N 5213, H04N 1419
Patent
active
050161040
ABSTRACT:
Method and systems for combatting degradation in the transmission or storage of data signals especially useful in the field of motion picture or television signal transmission, such that an advanced receiver can decode that information to provide improved picture quality, while a standard receiver will display an image with minimally visible impairments. A data signal can be decomposed into a low frequency signal and a high frequency signal, and that the high frequency signal can then be modified by the application of a series of scaling factors over selected regions in response to local variance of data values in such regions. The low frequency signal and the modified high frequency signal are then combined and transmitted (or recorded) as a modulated facsimile of the data signal, together with the scaling factors. In the advanced receiver (or playback unit), the data signal is reconstructed from the modulated facsimile with concommittant reduction in signal degradation by the application of a series of inverse scaling factors.
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Chin Tommy P.
Engellenner Thomas J.
Massachusetts Institute of Technology
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