Abstract: A television receiver is disclosed in which an NTSC signal having an aspect ratio of 4:3 is received and supplied to an NTSC decoder to demodulate the R, G, B signal and a sync signal to be applied to a time-base conversion circuit for conversion into non-interlace scanning and aspect-ratio conversion under the control of clock signals generated by a first clock generator for writing and a second clock generator for reading. The second clock generator for reading has the number of clock signals set to an even number per one scanning line for reading to display on a television receiver having an aspect ratio of 5:3.

Abstract: A subsample signal processing apparatus includes a wide-band D/A converter receiving a digital television signal which is compressed in band by subsampling. A signal processor subjects a video signal portion of an output signal from the D/A converter to wide-band processing. The signal processor subjects a sync signal portion of the output signal from the D/A converter to narrow-band processing. An output terminal of the signal processor and an input terminal of a subsequent A/D converter are coupled with wide-band coupling characteristics.

Abstract: An image signal processing apparatus is provided which is applicable to a motion adaptive Y/C separation of an NTSC signal and a time-domain/spatial interpolation of a high definition television signal band-compressed by sub-Nyquist sub-sampling. The apparatus includes a still image processing circuit having frame memories, a motion image processing circuit having a line memory, a mixing circuit for mixing outputs of these processing circuits, a circuit for detecting image motion of an input image signal and applying a resultant control signal to the mixing circuit, and a signal mode control circuit for selectively adapting the image processing circuits for the processing of the NTSC signal or the high definition television signal.

Abstract: A television signal receiving apparatus of the type in which when performing a picture in picture operation by receiving a plurality of picture signals compressed in band width by multiple sub-Nyquist sampling, a sub-channel signal is first subjected to a spatial interpolating process and combined with a main-channel signal. The still picture portion and moving picture portion of a first input signal are restored to a field offset sub-sampled first picture signal, and a second input signal is restored to a field offset sub-sampled picture signal, subjected to a size-reducing process by time base compression in the vertical and horizontal directions of the picture and delivered as a second picture signal of the form synchronized in phase with a given position of the first picture signal. The first and second picture signals are time-division multiplexed to deliver a third picture signal onto a picture screen.

Abstract: When the receiving system for a band-compression image signal receives a dropout signal representing a dropout portion of an image signal, an output of the third delay circuit of the temporal filter for motion detection processing, that is, motion information of an image signal, which precedes by one field, and a dropout signal activate the signal selection control circuit to produce an output signal for controlling the operation of the signal selection circuit, so that an output signal of the first delay circuit is selected for a static portion of an image, and an output signal of the dropout compensation circuit is selected for a moving portion of an image, so as to effect compensation control of the dropout portion of an image signal, thereby preventing deterioration of the quality of an image.

Abstract: The diversity receiver having a plurality of antennas and one receiver comprises a detector means to detect a signal voltage responsive to an antenna output from an intermediate frequency amplifier of the receiver, and a comparator unit to receive two separated components of the signal voltage from the detector unit through two separated paths, so that one of the antennas which is in the best receiving condition is selected in response to an output from the comparator unit.

Abstract: The diversity receiver including plural antennas and one receiver comprises a detector means to detect a signal voltage responsive to an antenna output from an IF amplifier of the receiver and a comparator which is supplied with the signal voltage separated in two courses, one including a fixed bias applying circuit and the other including a time constant circuit, so as to select one of the antennas which is in a good receiving condition.

Abstract: An FM noise reducing circuit which comprises an operational amplifier for comparing intermediate frequency signal levels and multipath signal levels, and a multiplexer controlled by output signals from the operational amplifier is arranged to carry out attenuation of high frequency components as well as blending of outputs from right and left channels in response to the output signals of the operational amplifier.

Abstract: A diversity receiver which comprises two pairs of antennas and tuners and a comparator for comparing two signals obtained from said two tuners so that one of the tuners is selected in response to the result obtained in the comparator includes an antenna switching circuit and an operating antenna indicating circuit which are connected to the comparator so that the antenna associated with the selected tuner by the operation of the antenna switching circuit is indicated in the operating antenna indicating circuit.