Abstract: A magnetic head assembly having two magnetic heads for use on two sides of a magnetic head and arranged so as to use one common circuit to process signals from the two magnetic heads and so that the magnetic heads can be manufactured at a reduced cost. The magnetic heads are disposed on the two sides of the magnetic disk so that magnetic core blocks of the magnetic heads are located at different distances from the center of rotation of the magnetic disk. Recording/reproduction gaps of the magnetic core blocks are formed so that the depth of the recording/reproduction gap of the magnetic core block closer to the center of rotation of the magnetic disk is larger than the depth of the recording/reproduction gap of the other magnetic core block.

Abstract: A system for converting an analog video signal obtained by scanning an original image to be processed into a two-valued video signal such as an input portion of a facsimile machine includes a peak/valley extracting circuit for extracting peaks and valleys in the analog video signal before thresholding the analog video signal so as to determine an optimal threshold level to be used in thresholding. The peak/valley extracting circuit includes peak and valley thresholds in addition to the threshold to be used in thresholding the analog video signal to produce a two-valued video signal. The peak/valley extracting circuit is so structured to supply a peak/valley extraction signal if an extracted peak or valley also satisfies the condition that it is equal to or higher or lower in level than the peak or valley threshold.

Abstract: In a video signal processing circuit for removing an energy diffusion signal from a broadcasting satellite signal superposed with the energy diffusion signal, a video clamp circuit including a switching circuit for pedestal clamp for the purpose of maintaining a pedestal level as the basis of the black level of a video signal and a noise detection circuit for detecting the noise contained in the video signal, whereby the output from the noise detection circuit is applied to the switching circuit for pedestal clamp so that the clamp performance of the switching circuit for pedestal clamp is reduced by means of the output of the noise detection circuit when an S/N ratio applied to the noise detection circuit is not good, thereby improving the quality of the reception picture.