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EP0352963A2
Expired / Lapsed
EP
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Method of and apparatus for receiving high definition television signals
Assignee: British Broadcasting Corp
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Filing: 1989-07-20
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Granted: —
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Expires: 2009-07-20
Abstract
Abstract An enhanced definition PAL signal (HD-PAL) may be received by a MAC receiver by decoding the signal received with a simple PAL decoder (10), time compressing the luminance and chrominance components of the decoded signal and encoding them in a MAC format (12). The MAC signal is then decoded using an HD-MAC decoder (14) and the signals are expanded by a post processor (16) prior to display.
Inventors
- 👤 Michael George Croll
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:26
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/20; H04N11/02; H04N11/24; H04N11/28; H04N7/00; H04N7/12; H04N7/122; H04N7/125; H04N11/12; H04N11/14; H04N11/16; H04N11/167
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
64 words
A method of receiving high definition television signals transmitted in a first signal format, comprising receiving the signals and decoding with a decoder compatible with the first signal format, characterised by processing the signals by reformating and encoding in a second signal format, decoding the re-encoded signal with a decoder compatible with the second signal format and displaying the information conveyed by the signal.
Claim 2
Independent Claim
64 words
A method of receiving high definition television signals transmitted in a first signal format, comprising receiving the signals and decoding with a decoder compatible with the first signal format, characterised by processing the signals by reformating and encoding in a second signal format, decoding the re-encoded signal with a decoder compatible with the second signal format and displaying the information conveyed by the signal.
Claim 3
Dependent Claim
40 words
A method according to Claim 1, wherein the processing of the decoded signal comprises adjusting the bandwidth of the luminance and chrominance components of the signal to match the bandwidth of the components when encoded in the second signal format.
Claim 4
Independent Claim
22 words
A method according to Claims 1 or 2, wherein the signal decoded from the second signal format is reprocessed prior to display.
Claim 5
Independent Claim
18 words
A method according to Claims 2 or 3, wherein the processing comprises time compression of the signal components.
Claim 6
Dependent Claim
16 words
A method according to Claim 4, wherein the reprocessing comprises time expansion of the signal components.
Claim 7
Dependent Claim
22 words
A method according to Claim 5, wherein the degree of time expansion and compression is variable in accordance with a control signal.
Claim 8
Independent Claim
39 words
A method according to any of Claims 4, 5 or 6, wherein the signal is compressed or expanded by writing signal data into a store at a first rate and reading data from the store at a second rate.
Claim 9
Dependent Claim
14 words
A method according to Claim 7, wherein the read and write rates are variable.
Claim 10
Independent Claim
27 words
A method according to any preceding claim wherein the first signal format is a frequency multiplexed format and the second signal format is a time multiplexed format.
Claim 11
Dependent Claim
65 words
A receiver for receiving high definition television signals transmitted in a first signal format, comprising means (10) for receiving and decoding the signal, characterised by processing means (12) for reformating the decoded signal and encoding the signal in a second signal format, means (14) compatible with the second signal format for decoding the re-encoded signal, and means for displaying the information conveyed by the signal.
Claim 12
Dependent Claim
65 words
A receiver for receiving high definition television signals transmitted in a first signal format, comprising means (10) for receiving and decoding the signal, characterised by processing means (12) for reformating the decoded signal and encoding the signal in a second signal format, means (14) compatible with the second signal format for decoding the re-encoded signal, and means for displaying the information conveyed by the signal.
Claim 13
Dependent Claim
38 words
A receiver according to Claim 10, wherein the processing means (12) comprises means for adjusting the bandwidth of the components of the decoded signal to match the bandwidth of the components when encoded in the second signal format.
Claim 14
Dependent Claim
24 words
A receiver according to Claims 10 or 11, comprising means for reprocessing (16) the signal decoded from the second signal format prior to display.
Claim 15
Dependent Claim
23 words
A receiver according to Claims 11 or 12, wherein the bandwidth adjustment means comprises means (18Y, 18U/V) for time compressing the signal components.
Claim 16
Dependent Claim
20 words
A receiver according to Claim 13, wherein the reprocessing means comprises means (22Y¹, 22U¹/V¹) for time expanding the signal components.
Claim 17
Dependent Claim
25 words
A receiver according to Claim 14, comprising means for controlling the degree of compression and expansion effected by the time compression and time expansion means.
Claim 18
Dependent Claim
51 words
A receiver according to any of Claims 13, 14 or 15, wherein the time compression and time expansion means each comprises a store (26), means (28, 30) for writing data into the store at a first rate and means (32, 34) for reading data from the store at a second rate.
Claim 19
Dependent Claim
15 words
A receiver according to Claim 16, comprising means for varying the read and write rates.
Claim 20
Dependent Claim
44 words
A receiver according to any of Claims 11 to 17, wherein the means for decoding the first signal format comprises means for decoding a frequency multiplexed signal and the means for decoding the second signal format comprises means for decoding a time multiplexed signal.
Claim 21
Dependent Claim
23 words
A receiver according to any preceding claim, comprising means for selecting the means for decoding the re-encoded signal to decode the received signal.
References Cited (Backward Citations)
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