EP0447214A2
Expired / Lapsed
EP
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Compatible television system with companded auxiliary signal
Assignee: Toshiba Corp
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Filing: 1991-03-13
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Granted: —
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Expires: 2011-03-13
Abstract
Abstract A compatible television signal encoder for encoding a television signal having a first signal and a second signal. The decoder includes a divider for dividing the television signal into a main signal having the first signal and a low-frequency component of the second signal multiplexed in the the first signal and an auxiliary signal, an interpolator (1006) for producing an interpolating scanning field signal using a first scanning field signal of the main signal output from the divider, a field switch (1008) for replacing a second scanning field signal of the main signal with the interpolating scanning field signal output from the interpolator and an adder (1016) for adding the auxiliary signal from the divider to the signal output from the field switch. <IMAGE>
Inventors
- 👤 Seijiro Yasuki
- 👤 Kiyoyuki Kawai
- 👤 Noboru Taga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:41
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/015; H04N11/00; H04N11/24; H04N11/30; H04N7/01; H04N7/0117; H04N7/012; Y; Y10; Y10S; Y10S348/00; Y10S348/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A compatible television signal encoder for encoding a television signal having a first signal and a second signal comprising dividing means for dividing the television signal into a main signal having the first signal and low-frequency components of the second signal multiplexed in the first signal and an auxiliary signal, characterized in that the encoder further comprises: interpolating means (1006) for producing an interpolating scanning field signal using a first scanning field signal of the main signal output from the dividing means; replacing means (1008, 1010) for replacing a second scanning field signal of the main signal with the interpolating scanning field signal output from the interpolating means; and adding means (1016) for adding the auxiliary signal from the dividing means to the signal output from the replacing means.
Claim 2
Dependent Claim
118 words
A compatible television signal encoder of claim 1, further comprising: first filter means (1001) for extracting a prescribed frequency component from the main signal divided by the dividing means; second filter means (1003, 1004) for limiting the vertical band of the output extracted from the first filter means in a prescribed number of scanning lines; switch means (1005) for selectively applying the first scanning field signal of the main signal to the interpolating means; third filter means (1013) for limiting the vertical band of the auxiliary signal to the prescribed number of scanning lines; and frequency modulation means (1014) for shifting the output from the third filter means to the frequency band of the second scanning field signal
Claim 3
Dependent Claim
150 words
A compatible television signal decoder for decoding a television signal having a main signal encoded on both a first field signal and an interpolated second field signal by using the first field signal and an auxiliary signal encoded on the interpolated second field signal, the main signal including a first signal and a low-frequency component of teh second signal multiplexed in the first signal and the auxiliary signal, characterized in that the decoder comprises: interpolating means (2004) for producing a compensating field signal using the first scanning field signal of the television signal; first adding means (2012) for separating the auxiliary signal by subtracting the compensating field signal output from the interpolating means from the second field signal output from the television signal; and second adding means (2008) for adding the second scanning field signal of the television signal and the compensating field signal second output from the interpolating means.
Claim 4
Dependent Claim
84 words
A compatible television signal decoder of claim 3, further comprising: filter means (2002) for limiting the television signal applied to the interpolating means to a prescribed frequency component; frequency demodulation means (2011) for shifting the auxiliary signal to the original frequency; first switch means (2007) for selectively applying the second scanning field signal of the auxiliary signal to the frequency demodulation means; and second switch means (2008) for selectively applying the second scanning field signal of the auxiliary signal to the second adding means.
Claim 5
Dependent Claim
154 words
A compatible wide aspect television signal encoder for encoding a wide aspect television signal having a center panel signal and side panel signals comprising dividing means for dividing the wide aspect television signal into a main signal having the center panel signal and low-frequency components of the side panel signals multiplexed in the horizontal overscan regions of the center panel region and an auxiliary signal having time expanded high-frequency components of the side panel signals, characterized in that the encoder further comprises: interpolating means (1006) for producing an interpolating scanning field signal using a first scanning field signal of the main signal output from the dividing means; replacing means (1008, 1010) for replacing a second scanning field signal of the main signal with the interpolating scanning field signal output from the interpolating means; and adding means (1016) for adding the auxiliary signal from the dividing means to the signal output from the replacing means.
Claim 6
Dependent Claim
118 words
A compatible television signal encoder of claim 5, further comprising: first filter means (1001) for extracting a prescribed frequency component from the main signal divided by the dividing means; second filter means (1003, 1004) for limiting the vertical band of the output extracted from the first filter means in a prescribed number of scanning lines; switch means (1005) for selectively applying the first scanning field signal of the main signal to the interpolating means; third filter means (1013) for limiting the vertical band of the auxiliary signal to the prescribed number of scanning lines; and frequency modulation means (1014) for shifting the output from the third filter means to the frequency band of the second scanning field signal
Claim 7
Dependent Claim
170 words
A compatible wide aspect television signal decoder for decoding a wide aspect television signal having a main signal encoded on both a first field signal and an interpolated second field signal by using the first field signal and an auxiliary signal encoded on the interpolated second field signal, the main signal including a center panel signal and low-frequency components of side panel signals multiplexed in the horizontal overscan regions of the center panel signal and the auxiliary signal including time expanded high-frequency components of the side panel signals, characterized in that the decoder comprises: interpolating means (2004) for producing a compensating field signal using the first scanning field signal of the television signal; first adding means (2012) for separating the auxiliary signal by subtracting the compensating field signal output from the interpolating means from the second field signal output from the television signal; and second adding means (2008) for adding the second scanning field signal of the television signal and the compensating field signal second output from the interpolating means.
Claim 8
Dependent Claim
86 words
A compatible wide aspect television signal decoder of claim 7, further comprising: filter means (2002) for limiting the television signal applied to the interpolating means to a prescribed frequency component; frequency demodulation means (2011) for shifting the auxiliary signal to the original frequency; first switch means (2007) for selectively applying the second scanning field signal of the auxiliary signal to the frequency demodulation means; and second switch means (2008) for selectively applying the second scanning field signal of the auxiliary signal to the second adding means.
References Cited (Backward Citations)
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