Video compensation circuit for emphasized-carrier detector

Claim 2

In a television receiver including means for deriving an IF signal: first detector means having an input and an output terminal, said input terminal being adapted to receive the IF signal; signal emphasizing means for causing the amPlitude of predetermined portions of the IF signal to increase relative to the amplitudes of other portions of the IF signal; second detector means having an input terminal and an output terminal, said input terminal being adapted to be coupled to said signal emphasizing means; means coupling said input terminals of said first and second detector means; and differential circuit means adapted to receive signals produced at the output terminals of said first and said second detector means for producing an output corresponding to the difference in amplitude between said signals.

Claim 3

In a television receiver including means for deriving an IF signal including a sound carrier portion, a chroma carrier portion, and a picture carrier portion; first detector means adapted to receive the IF signal; resonant circuit means for causing the amplitude of the picture carrier portion of the IF signal to increase relative to the amplitudes of the other portions of the IF signal; second detector means adapted to be coupled across said resonant circuit means; means for coupling said resonant circuit means to said first detector means for supporting a voltage drop thereacross which includes said other portions of said IF signal; and differential amplifier means adapted to receive signals derived by said first and said second detector means for outputting a signal representative of the difference therebetween.

Claim 4

In a television receiver including means for deriving an IF signal including a sound carrier portion, a chroma carrier portion, and a picture carrier portion; first detector means adapted to receive the IF signal; resonant circuit means for causing the amplitude of the picture carrier portion of the IF signal to increase relative to the amplitudes of the other portions of the IF signal; second detector means adapted to be coupled across said resonant circuit means; means for coupling said resonant circuit means to said first detector means for supporting a voltage drop thereacross which includes said other portions of said IF signal; and differential amplifier means adapted to receive signals derived by said first and said second detector means for outputting a signal representative of the difference therebetween.

Claim 5

The invention as defined in claim 2, wherein said resonant circuit means comprises the parallel combination of an inductor and a capacitor.

Claim 6

The invention as defined in claim 3, further including first circuit means adapted to receive the signal outputted by said differential amplifier means for attenuating the signals outputted thereby which constitute sound information but not substantially attenuating others of said signals; and second circuit means adapted to receive the signal outputted by said differential amplifier means for passing portions of said signal representing sound information and attenuating the other portions of said signal.

Claim 7

In a television receiver including means for deriving an IF signal including a sound carrier, a chroma carrier and a picture carrier: signal emphasizing means adapted to be coupled to the path of the IF signal, said signal emphasizing means comprising the series combination of resistive means having a first and a second end and resonant circuit means coupled to said second end of said resistive means; first detector means for detecting signals appearing at said first end of said resistive means; second detector means for detecting signals appearing at said second end of said resistive means; and differential amplifier means adapted to receive signals outputted by said first and said second detector means for providing a signal representative of the difference therebetween.

Claim 8

In a television receiver including means for deriving an IF signal including a sound carrier, a chroma carrier and a picture carrier: signal emphasizing means adapted to be coupled to the path of the IF signal, said signal emphasizing means comprising the series combination of resistive means having a first and a second end and resonant circuit means coupled to said second end of said resistive means; first detector means for detecting signals appearing at said first end of said resistive means; second detector means for detecting signals appearing at said second end of said resistive means; and differential amplifier means adapted to receive signals outputted by said first and said second detector means for providing a signal representative of the difference therebetween.

Claim 9

The invention as defined in claim 5, further including inductive means coupled across said signal emphasizing means.

Claim 10

The invention as defined in claim 6, wherein said first and second detector means are diodes.

Claim 11

The invention as defined in claim 7, further including filter means coupled between said detector means and said differential amplifier means.

Claim 12

The invention as defined in claim 7 wherein said differential amplifier means comprises at least two electronic devices, each of said electronic devices having an input and an output terminal and a control terminal.

Claim 13

The invention as defined in claim 8, further including second filter means adapted to receive the signal outputted by said differential amplifier means for substantially blocking those portions of said signal representing sound signals and passing substantially the rest of said signal.

Claim 14

The invention as defined in claim 9, further including third filter means adapted to receive the signal outputted by said differential amplifier means for passing those portions of said signal representing sound signals and substantially blocking the rest of said signal