| 摘要 |
PURPOSE:To obtain an identity discriminator which is operated in a excellent way even if two sound signals have a time difference, by giving a delay to one of the two sound signals relatively in advance for discrimination, relating to a car radio receiver. CONSTITUTION:A delay circuit 40 delays a sound signal of a reception system 6 after a low pass filter 30 and a low frequency amplifier 32 by a time (t), and a delay circuit 41 gives a delay of (t) to a sound signal of a reception system 10 after a low pass filter 31 and an amplifier 33. In the content discriminating circuit constituted in this way, in discriminating sinusoidal waves having a time difference, the discriminated time difference is increased while leaving the sound signal components used for the discrimination sufficiently, and the same content is discriminated surely even if the two broadcast sound signals have the same content and a comparatively large time difference. |
