Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A color-signal enhancing circuit which comprises: a pair of first and second input terminals which respectively receives input color difference signals based on certain image signals; a pair of first and second frequency region restricting means each of which gives restrictions of a predetermined frequency region to each of said respective color difference signals; a control circuit which receives outputs from said first and second frequency region restricting means and produces a gain control signal; and a pair of first and second gain control means each of which effects gain-controlling of each of said input signals by using said gain control signal outputted from said control circuit, whereby, with each of said first and second gain control means being controlled by the common and single gain control signal, the color signals based on the image signals inputted are enhanced.
Claim 2
Dependent Claim
139 words
A color-signal enhancing circuit which comprises: a pair of first and second input terminals which respectively receives input color difference signals based on certain image signals; a pair of first and second frequency region restricting means each of which gives restrictions of a predetermined frequency region to each of said respective color difference signals; a control circuit which receives outputs from said first and second frequency region restricting means and produces a gain control signal; and a pair of first and second gain control means each of which effects gain-controlling of each of said input signals by using said gain control signal outputted from said control circuit, whereby, with each of said first and second gain control means being controlled by the common and single gain control signal, the color signals based on the image signals inputted are enhanced.
Claim 3
Dependent Claim
96 words
A color-signal enhancing circuit according to claim 1, in which said control circuit comprises: a pair of first and second gain controllable amplifiers each of which gives a predetermined coefficient to each of said outputs from said first and second frequency region restricting means; an adding means which adds up outputs from a pair of said first and second amplifiers; and a convertor which gives to an output from said adding means a coefficient calculated in a predetermined operation in accordance with the polarity of signals inputted to said convertor and produces said gain control signal.
Claim 4
Dependent Claim
32 words
A color-signal enhancing circuit according to claim 1, in which a pair of said first and second frequency region restricting means are a first high-pass filter and a second high-pass filter, respectively.
Claim 5
Dependent Claim
32 words
A color-signal enhancing circuit according to claim 1, in which a pair of said first and second frequency region restricting means are a first low-pass filter and a second low-pass filter, respectively.
Claim 6
Dependent Claim
53 words
A color-signal enhancing circuit according to claim 1, in which said first and second gain control means are a first multiplier and a second multiplier, each of which multiplies said gain control signal from said control circuit with each of said input signals inputted to each of said first and second input terminals.
Claim 7
Dependent Claim
41 words
A color-signal enhancing circuit according to claim 2, in which a pair of said gain control means are multipliers each of which effects gain-controlling of each of said input color difference signals by using said gain control signal from said convertor.