EP0400756A2
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EP
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Method and apparatus for digitally processing a high definition television augmentation signal
Assignee: Koninklijke Philips NV
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Filing: 1990-05-30
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Granted: —
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Expires: 2010-05-30
Abstract
Abstract A method and apparatus for digital encoding are described for compressing the augmentation channel signals (chrominance and luminance signals for panel information and high frequency luminance and line sifference signal) so that this information can be transmitted in a 3 MHz wide RF channel using a digital transmission scheme such as QPSK. Analog signal components are sampled and converted to digital signals. Each of the signals is fed into a separate coder which reduces the number of bits/pixel required to reconstruct the original signal. Compression is achieved by quantization and removal of redundancy. The compression scheme is based on the use of DCT together with VLC. Each augmentation signal has its own coder, which is adapted to the unique statistics of this signal.
Inventors
- 👤 Faramarz Azadegan
- 👤 Eberhard Fisch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 15:15
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N11/00; H04N11/24; H04N11/26; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/129; H04N19/134; H04N19/136; H04N19/14; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/13; H04N19/146; H04N19/152; H04N19/90; H04N19/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A method for digitally processing a high definition television (HDTV) signal comprised of a plurality of signal components, said method comprising the steps of: a) deriving said signal components from a high definition television source; b) digitizing said signal components forming thereby a plurality of digitized components and; c) compressing each of said digitized components in a coder optimized for its respective digitized component.
Claim 2
Independent Claim
64 words
A method for digitally processing a high definition television (HDTV) signal comprised of a plurality of signal components, said method comprising the steps of: a) deriving said signal components from a high definition television source; b) digitizing said signal components forming thereby a plurality of digitized components and; c) compressing each of said digitized components in a coder optimized for its respective digitized component.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein each said coder compresses its respective digitized component using a discrete cosine transform process and a variable length coding process.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said signal components comprise at least one luminance component and at least one chrominance component.
Claim 5
Independent Claim
75 words
An apparatus for digitally processing an HDTV signal comprises of a plurality of signal components, said apparatus comprising: a) means for deriving said signal components from a high definition television source; b) digitizing means coupled to said deriving means for digitizing said signal components forming thereby a plurality of digitized components and c) coding means coupled to said digitizing means for compressing each of said digitized components in a manner optimized for said respective component.
Claim 6
Independent Claim
75 words
An apparatus for digitally processing an HDTV signal comprises of a plurality of signal components, said apparatus comprising: a) means for deriving said signal components from a high definition television source; b) digitizing means coupled to said deriving means for digitizing said signal components forming thereby a plurality of digitized components and c) coding means coupled to said digitizing means for compressing each of said digitized components in a manner optimized for said respective component.
Claim 7
Dependent Claim
28 words
The apparatus of claim 4 wherein each of said coding means compresses its respective digitized component using a discrete cosine transform process and a variable length coding process.
Claim 8
Dependent Claim
21 words
The apparatus of claim 4 wherein said signal components comprise at least one luminance component and at least one chrominance component.
Claim 9
Independent Claim
76 words
A system for transmitting and receiving an HDTV signal wherein an HDTV source signal is divided into a conventional television signal and an augmentation signal and wherein said augmentation signal, when combined at a receiver with said conventional signal recreates said HDTV source, characterized in that said augmentation signal is digital in form and comprises of a plurality of digital signal components derived from said HDTV source signal and each is processed using a separate coder.
Claim 10
Independent Claim
76 words
A system for transmitting and receiving an HDTV signal wherein an HDTV source signal is divided into a conventional television signal and an augmentation signal and wherein said augmentation signal, when combined at a receiver with said conventional signal recreates said HDTV source, characterized in that said augmentation signal is digital in form and comprises of a plurality of digital signal components derived from said HDTV source signal and each is processed using a separate coder.
References Cited (Backward Citations)
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