| 摘要 |
A color television receiver in which a first transducer is disposed on a substrate of piezoelectric-material for converting a color television signal including a luminance signal, color-difference signals, a sound signal and a picture carrier into an elastic surface wave. A second, a third, a fourth and a fifth transducer are disposed on the substrate for converting the elastic surface wave propagating from the first transducer into electrical signals respectively including solely the luminance signal component, color-difference signal component, sound signal component and picture carrier component of the color television signal. The electrical signal including solely the luminance signal component and the electrical signal including solely the picture carrier component are applied to a first synchronous detector for the synchronous detection of the luminance signal component, and the electrical signal including solely the color-difference signal component and the electrical signal including solely the picture carrier component are applied to a second synchronous detector for the synchronous detection of the color-difference signal component, while the electrical signal including solely the sound signal component and the electrical signal including solely the picture carrier component are applied to a third synchronous detector for the synchronous detection of the sound signal component.
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