Abstract: When a continuous wave signal synchronized with a first color subcarrier signal is generated by a color subcarrier extracting circuit, a phase error detecting circuit, an A/D converting circuit, and a digital oscillating circuit from an analog video signal containing a first color sub carrier signal supplied to a first input terminal and a digital video signal containing a color signal component supplied to a second input terminal is converted by a digital video signal converting circuit into a composite video signal containing a carrier chrominance signal, a color signal component is converted into a carrier chrominance signal by using the continuous wave signal and a phase of a first color subcarrier signal contained in the analog video signal and a phase of a second color subcarrier signal of a composite video signal formed from the digital video signal are synchronized with each other.

Abstract: A video camera including a zoom-up lens assembly magnifying an image, a charge coupled device picking up the magnified image, a recording medium for storage of the magnified image and a viewfinder having a display panel and a liquid crystal device for determining a partial area of the display panel on which the magnified image to be recorded is displayed. The liquid crystal device is controlled by a microcomputer so as to form an opaque frame-like line surrounding the partial area of the display panel.

Abstract: A method of testing an electronic apparatus which eliminates a control signal line for setting an integrated circuit to a test mode and a test mode select terminal of an external terminal section and wherein fetching of test data and transfer of the thus fetched test data are performed in an integrated operation. In each of the integrated circuits, a boundary scan control circuit discriminates a category code at the top of data inputted from a serial input terminal to control a pair of switching circuits. When the category code represents a test mode, predetermined terminals of the switching circuits are selected so that input data are sent out to boundary scan cells. Fetching of parallel data from parallel input terminals and transfer to the boundary scan cells are performed at a time.

Abstract: An integrated circuit for boundary scan is achieved to be simple structure. A testing apparatus 6 provides a testing data to a serial input port SI of a integrated circuit IC1 via a external terminal unit 2. The testing data is output to a parallel input port PI of the integrated circuit IC2 from a parallel output port SO of the integrated circuit IC1, then the testing data is output from the serial output port SO. The testing apparatus 6 compares with the testing data outputted to the integrated circuit IC1 and the testing data outputted from the integrated circuit IC2 so that a state of connection is detected between the parallel output port PO of the integrated circuit IC1 and the parallel input port PI of the integrated circuit IC2. The construction of the integrated circuits can be simplified by using both of inputting and outputting of the serial interface SIF.

Abstract: Apparatus that is self-contained with video equipment, such as a video camera or video record/playback device, and which generates video signal adjustment data for use by video signal processing circuits that are included in such video equipment. An input video signal is coupled to luminance and/or chroma digital signal processing circuits which are supplied with luminance or chroma adjustment control data, respectively, for subjecting the input video signal to predetermined luminance or chroma adjustment operations, thereby producing adjusted digital luminance and chroma signals, respectively. At least one of the adjusted digital luminance and chroma signals is sampled at preselected times; and the sampled digital signals are used by an adjustment control data generator for generating the luminance and/or chroma adjustment control data that are supplied to the luminance and/or chroma digital signal processing circuits.

Abstract: A digital image signal processing circuit for use in a VTR with camera has a signal input terminal to which an image pickup output signal or a video signal is supplied, an analog to digital converter for producing a digital image pickup output signal based on the image pickup output signal or a digital video signal based on the video signal, a digital signal processing portion including first, second and third digital signal processing circuit blocks, a system controller for conducting the change of operation, the change of circuit configuration or the change of circuit coefficient in each of the first, second and third digital signal processing circuit blocks, and signal output terminals from which recording luminance and carrier chrominance signals produced by the digital signal processing portion are derived.

Abstract: A lens focusing system in which predetermined signal components in a video signal are detected for focusing an image by maximizing the predetermined signal components, includes a lens for focusing an image on an image pickup device operative to convert light from the lens into electric signals; a signal processing circuit for processing the output electric signals from the image pickup device to obtain video signals; a filter which has a transfer characteristic approximating that of a lens system which is out of focus; and a subtracting circuit for eliminating video signal components which pass through the filter from the electric signals output by the image pickup device. Novel digital filters particularly adapted for use with such lens focusing systems also are provided.

Abstract: A video camera having an imager providing an imager signal corresponding to an object in the field of view of the camera, and an integral magnetic recording and reproducing device are provided with a video signal processing apparatus including an imager signal processing circuit having a delay circuit for delaying the imager signal and from which a luminance signal and a chrominance signal are produced, a recording circuit for recording the luminance and chrominance signals on a magnetic tape or other medium, and a reproducing circuit for reproducing the luminance and chrominance signals from the magnetic medium with at least one of the reproduced signals being applied to the delay device and with a composite video signal being obtained from the output of such delay device.

Abstract: Apparatus for processing a color video signal produced by an imager. A low-pass filter supplied with the color video signal from the imager generates a luminance signal to which is added an outline component produced by a level correcting circuit that receives the color video imager signal and passes a level-corrected imager signal through a bandpass filter which extracts therefrom the outline component.

Abstract: A lens focusing system in which predetermined signal components in a video signal are detected for focusing an image by maximizing the predetermined signal components, includes a lens for focusing an image on an image pickup device operative to convert light from the lens into electric signals; a signal processing circuit for processing the output electric signals from the image pickup device to obtain video signals; a filter which has a transfer characteristic approximating that of a lens system which is out of focus; and a subtracting circuit for eliminating video signal components which pass through the filter from the electric signals output by the image pickup device. Novel digital filters particularly adapted for use with such lens focusing systems also are provided.

Abstract: A digital camera apparatus has an analog emphasis circuitry arranged such that when an output from a charge-coupled device (CCD) forming the imager and cooperating with a complementary color, checkered pattern filter is processed in a digital fashion, an analog carrier chrominance signal component is emphasized before being converted to a digital signal, thus making it possible to reduce adverse influence caused by quantization noise.

Abstract: A noise reduction circuit comprises a high pass filter for extracting a signal component containing noise from an input signal, a variable level limiter for limiting the level of the signal component extracted by the filter to produce a noise suppressing signal, and a level adjustor for adjusting the level of the noise suppressing signal. A level detector detects the level of the input signal, and a control signal generator generates first and second control signals based on the detected output of the level detector, supplies the first control signal to the level limiter so as to control the limit level thereof, and supplies the second control signal to the level adjustor so as to control the gain thereof. In a signal subtracter, the noise suppressing signal from the level adjustor is added with reversed polarity to the input signal to suppress the noise contained in the input signal and thereby produce a low-noise output signal.

Abstract: A color signal matrix circuit for producing first and second color difference signals from three primary color signals employs a reduced number of digital circuit elements and includes a first subtractor for producing a first color subtraction signal based on red and green primary color signals, a second subtractor for producing a second color subtraction signal based on blue and green primary color signals, a first level adjuster receiving the first color subtraction signal, a second level adjuster with a variable level factor receiving the second color subtraction signal, a third subtractor receiving the first color subtraction signal from the first level adjuster and the second color subtraction signal from the second level adjuster for producing the first color difference signal, and a third level adjuster receiving the second color subtraction signal, a fourth level adjuster with a variable level factor receiving the first color subtraction signal, and a fourth subtractor supplied with the second color s

Abstract: A magnetic recording and reproducing apparatus having a delay circuit with a plurality of output terminals, one output terminal providing a delayed output video signal for which a delay amount corresponding to a deviation of an H alignment between adjoining record tracks is provided and another output terminal providing another delayed output video signal for which a delay amount corresponding to one horizontal synchronization interval (1H) is provided, and having signal selection switch circuitry which sequentially selects the reproduced video signal to be sent to the delay circuit and which also selects the delayed reproduced video signal during an interval for which an auxiliary head is selected in place of a normal record/playback head in a variable speed reproduction mode, so that a reproduced video signal with continuous H alignment can be secured and video images with a good picture quality can be achieved.

Abstract: A C-type comb filter that employs a first charge-coupled device (CCD) delay circuit and a second CCD delay circuit having an intermediate tap, whereby a delayed signal from the intermediate tap is fed back to be subtracted from the input side of the C-type comb filter to thereby form a feedback C-type comb filter, thus improving the comb filter characteristic.

Abstract: A color video signal processing circuit comprising an input terminal through which a color video signal including chrominance and luminance signals is supplied, a signal separating portion which includes both a subtraction-type comb-filter by which a first signal is derived from the color video signal and an addition-type comb-filter by which a second signal is derived from the color video signal, a level modifying portion for emphasizing the level of a first segment of the first signal residing in a predetermined frequency band lower than the frequency band of the chrominance signal and attenuating the level of a second segment of the first signal residing in the frequency band of the chrominance signal, an adder for adding an output of the level modifying portion to the second signal, a first output portion connected to the signal separating portion, and a second output portion connected to the adder.

Abstract: Signal processing apparatus for processing a color video signal formed of a luminance signal and a color carrier signal reproduced from a magnetic tape, in which the signals include respective crosstalk components produced from the tracks adjacent the track being traced. The color video signal was originally recorded so that the crosstalk components are frequency interleaved relative to the signal in the track being reproduced, and signal processing apparatus permits the luminance and color carrier signals to be processed and the respective crosstalk components eliminated using only a single time delay element for both luminance and color carrier crosstalk components. The single delay unit is part of a comb filter and is particularly adapted for fabrication as a CCD element.

Abstract: Apparatus for recording audio and video signals comprises a signal processor for producing a processed video signal and a frequency-modulated audio signal. The frequency-modulated audio signal is obtained by frequency-modulating a carrier in response to an input audio signal. A magnetic recorder records both the frequency-modulated audio signal and the processed video signal in oblique tracks arranged successively on a magnetic tape. The recording is done selectively in a first recording mode wherein the oblique tracks are formed with spaces between successive tracks or a second recording mode wherein successive tracks are contiguous. A modulation control controls the frequency-modulation carried out by the signal processor to produce the frequency-modulated audio signal with a first modulation index in the first recording mode and with a second modulation index greater than the first modulation index in the second recording mode.

Abstract: In an apparatus for magnetically recording and/or reproducing two-channel audio signals and a color video signal, the color video signal is processed to provide a frequency-modulated luminance signal and a frequency-converted chrominance signal in a band below that of the frequency modulated luminance signal, and the two-channel audio signals are processed to provide a frequency-modulated audio signal including alternated first and second segments respectively corresponding to the two-channel audio signals. The frequency-modulated audio signal is mixed with, and located between the frequency bands of the frequency-modulated luminance signal and the frequency-converted chrominance signal to provide a mixed signal which is recorded in successive oblique tracks on a magnetic tape.

Abstract: An active filter circuit having emitter coupled first and second transmittors and emitter coupled third and fourth transistors, wherein the base and collector electrodes of the third transistor are connected to the base electrode of the first transistor, and the base and collector electrodes of the fourth transistor are connected to the base electrode of the second transistor with a reactance circuit connected to a collector electrode of the second transistor and an output terminal connected by the collector electrode of the second transistor such that the filter circuit has a small number of components and operates over a broad band.