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1. (WO1997019563) COMB FILTER MODULE WITH BOTH COMPOSITE AND Y/C-SEPARATED INPUTS
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CLAIMS

1 A comb filter module comprising an input for a composite video signal, a comb filter circuit for separating the composite video signal supplied to the input into separate luminance and chrominance signals and first and second outputs to which respectively the luminance and chrominance signals from the comb filter circuit are supplied, characterised in that the module includes two further inputs for the separate luminance and chrominance component signals of a second video signal and switching means for selectively supplying the separate luminance and chrominance signals from either the comb filter circuit or the two further inputs to the first and second outputs

2 A comb filter module according to Claim 1 , characterised in that module comprises a housing containing the comb filter circuit and the switching means and having connection pins extending therefrom for use in mounting the module on a pcb and in that the inputs and outputs of the module are provided by respective ones of said connection pins

3 A comb filter module according to Claim 2, characterised in that the comb filter circuit includes circuit components carried on a substrate and electrically connected to a glass delay line, and in that the switching means is carried on the substrate together with the circuit components

4 A comb filter module according to any one of the preceding claims, characterised in that the module includes an input for a control signal for controlling operation of the switching means which input comprises one of said video signal inputs

5 A comb filter circuit according to Claim 5, characterised in that the input for the control signal comprises said composite video signal input

6. A comb filter module according to any one of the preceding claims, characterised in that the switching means comprises a diode circuit in which the luminance and chrominance signals from the comb filter circuit and the luminance and chrominance signals from the two further inputs are supplied to the first and second outputs via respective diodes.

7. A comb filter circuit according to Claim 6, characterised in that the diode circuit is arranged such that the luminance and chrominance signals from the comb filter circuit render their associated diodes conducting and the diodes associated with the luminance and chrominance signals from the two further inputs non-conducting, thereby allowing the luminance and chrominance signals from the comb filter circuit to pass to the first and second outputs.

8. Television apparatus including video signal selection means for selecting between first and second video signals from first and second video signal sources respectively, the first video signal comprising a composite video signal and the second video signal being in separate luminance and chrominance form, characterised in that the selection means comprises a comb filter module in accordance with any one of Claims 1 to 7.