Abstract: A video ghost signal canceling circuit which has an adding means for adding a ghost canceling signal to a digital video signal thereby canceling ghost components of the video signal, and a ghost canceling signal generation means for generating a ghost canceling signal in accordance with an output of the adding means. The ghost canceling signal generation means of the present invention comprises a variable delay filter means composed by a parallel arrangement of a plurality of variable delay lines a delay amount of which is controllable from the outside, and a plurality of transversal filters with a coefficient which is controllable, wherein each transversal filter is connected in series to corresponding variable delay line, and the adding means for adding all outputs of the variable delay filter means and for outputting a ghost canceling signal.

Abstract: A ghost canceling circuit comprising a Fourier transforming circuit for Fourier transforming a reference waveform contained in the received television signal while converting the analogue signal into digital form, a device for holding and outputting a reference waveform Fourier coefficient obtained by Fourier transforming the reference waveform contained in the television signal at the transmission side, a signal processing portion in which the outputted reference waveform Fourier coefficient is divided by the result of the A/D conversion, the divided Fourier coefficient is reverse Fourier transformed, and the reverse Fourier transformed Fourier coefficient is supplied to a transversal filter recognizing it as a tap gain.

Abstract: A moving sound source identifying system wherein a correlation function signal between two sound signals derived respectively from two microphones arranged apart from each other on the ground for respectively receiving sounds which are simultaneously emitted by a sound source is used for identifying whether the sound source is moving or stationary and whether it is flying or moving on the ground, by means of discriminating the variation of respective times whereat maximum or minimum levels of the correlation function signal appear, which variation is caused in accordance with the angle of elevation of the sound source. Continuously obtained results of the identification are utilized for classifying sound sources, removing the noise disturbance and automatically pursuing the sound source.