Circuit arrangement for separating video and audio signals
AssigneeU.S. Philips Corporation
InventorsThorwald Rabeler, Wolfgang Weltersbach
Life of this patent
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Abstract
A filter circuit for separating video and audio signals has an extra resistive element added. This forms a bridge circuit that greatly increases the attenuation of the audio signal in the video channel.
Claims10
A circuit arrangement for decoupling the video signal from an intercarrier sound signal in a television receiver, said circuit comprising an intermediate frequency source of video and sound signals, a sound trap coupled to said source and tuned to the intermediate frequency of the sound signal, a first output impedance from which the video signal can be obtained coupled to the a sound trap, a second output impedance from which the intercarrier sound signal can be obtained, means for coupling the second output impedance to the sound trap and for supplying the intercarrier sound signal from the sound trap to the second impedance, whereby losses are introduced into said sound trap thereby reducing the attenuation of said sound signal at said first output impedance, and means coupled to the sound trap for compensating for the losses, whereby a maximum attenuation for the intercarrier sound signal is produced at the first output impedance.
Dependencies are inferred from the claim text.