Abstract: An apparatus for recording video data by forming many tracks on a recording medium and/or for reproducing the video data from the tracks is provided with a memory which is arranged to have recording video data or reproduced video data supplied thereto. The apparatus detects the picture change-over portion of the video data obtained within the tracks and controls, in accordance with the detected position, an offset degree between the writing and reading addresses of the memory.

Abstract: An apparatus for correcting a time base of a video signal generates a clock which is phase-synchronized with a sync. signal of the video signal and has the same frequency. In a special reproducing mode, the apparatus switches an output level of a phase comparator, which phase-compares the sync. signal and the clock to a predetermined level, which is applied to a controlled oscillator and resets a frequency divider which frequency-divides the output of the controlled oscillator, in accordance with the sync. signal to produce the video signal which can be visually recognized even in the special reproducing mode. The apparatus samples and holds the output level of the phase comparator when the video signal drops out and resets the frequency divider which produces the clock by frequency-dividing the output of the controlled oscillator, when the dropout is recovered so that a video signal of high quality is produced immediately after the recovery of the dropout of the video signal.

Abstract: Apparatus for processing signals having time base variations comprises: time base variation correction circuitry for correcting time-base variations existing in a signal input thereto and having an input terminal and an output terminal, the output terminal providing signals which are time base variation corrected; a recording and/or reproducing unit having an input terminal for receiving a signal to be recorded on a recording medium and an output terminal for providing a signal reproduced from the recording medium; and switch circuitry operable in a recording mode for connecting the output terminal of the time base variation correction circuitry to the input terminal of the recording and/or reproducing unit and in a reproducing mode for connecting the output terminal of the recording and/or reproducing unit to the input terminal of the time base variation correcting circuitry.

Abstract: A tape drive controlling device includes a first controlling circuit for driving a take-up reel for a tape on the basis of the result of a comparison between a take-up-side tension measured between the take-up reel and a head and a predetermined tension target value, a second controlling circuit for driving a supply reel for the tape on the basis of the result of a comparison between a supply-side tension measured between the supply reel and the head and a predetermined tension target value, a speed detecting circuit for detecting the travel speed of the tape, and a correcting circuit for correcting at least one of the take-up-side and supply-side tension target values on the basis of the result of a comparison between a detection result provided by the speed detecting circuit and a travel speed target value.

Abstract: An apparatus receptive of illumination light from an illumination light source for providing a color image on a projection lens includes three displays responsive to a video signal for modulating incident lights to display respective component images, a first dichroic layer for separating the illumination light into a first component light and a first mixed light of different wavelength regions to give the first component light to one of the displays, a second dichroic layer for separating the mixed light into second and third component lights of different wavelength regions to give the second and third component lights to other two of the displays respectively, a third dichroic layer for synthesizing, out of the first, second and third information lights from the displays, the first and second information light, and a fourth dichroic layer for further synthesizing the light synthesized by the third dichroic layer with the third information light.

Abstract: A video signal recording apparatus for recording video signals while forming m number of tracks per frame on a recording medium by using a n number of rotary heads, m being an integer greater than n with n an integer of 2 or more. The apparatus is arranged to record tracking control signals cyclically on every n number of tracks.

Abstract: An apparatus for reproducing signals from a multiplicity of parallel tracks in a recording medium by means of n number of rotary heads, n being an integer not less than 3. A transportation device for transporting the recording medium is controlled on the basis of two kinds of signal: namely, a tracking control signal for leading one of the n number of rotary heads to one of m number of tracks contained in consecutive n number of tracks, m being an integer not less than 2; and a track shift signal which is generated in accordance with the result of a determination as to whether the n number of rotary heads are tracing expected tracks and which enable the tracks under tracing to be shifted to obtain a predetermined relationship between the sequence of the n number of rotary heads and the sequence of the tracks traced by these rotary heads.

Abstract: An image information transmission system for transmitting multi-pixel frames of image information, upon transmission, the data corresponding to a frame are divided into blocks each containing a predetermined number of pixel data, and discrimination data are prepared by discriminating whether each block belongs to a moving image area or a still image area of the frame. The data of a block of a moving image area are encoded using only the data of that block and according to a first encoding method, to form first encoded data. The data of a block of a still image area are encoded using the data of that block and those of other blocks, and according to a second encoding method, to form second encoded data. Transmission data are prepared from the encoded data and the discrimination data, and are sent to the transmission channel.

Abstract: An image information transmission method divides a frame of image data into a plurality of blocks each having a unit block constituted by a predetermined number of picture element (pixel) data. A plurality of distinguishable distribution data representing the distribution of levels of this pixel data are formed for each block from the pixel data. Position data representing the levels of the pixel data in terms of position in the distribution are also formed. A unit data block is formed for each block from the distribution and position data. The unit data blocks corresponding to successive blocks are serially transmitted in predetermined order, and the sequence of transmission of distribution data in each unit data block is changed in accordance with predetermined information.

Abstract: An apparatus for receiving the illumination light from an illumination light souce and for providing a color image on a projection lens includes three displays responsive to a video signal for modulating incident light to display respective component images. Also included are a first dichroic layer for separating the illumination light into a first light component and a first mixed light of different wavelengths to transmit the first light component to one of the displays, a second dichroic layer for separating the mixed light into second and third light component of different wavelengths to transmit the second and third light component to the other two of the displays, respectively, a third dichroic layer for combining the first and second information lights from the first two displays, and a fourth dichroic layer for further combining the information light combined by the third dichroic layer with a third information light from the third display.