Pioneer Electronic Corporation

Universal Pioneer Corporation

Toru Akiyama

Takashi Okano

Masao Kanda

Takanori Maeda

Akihiro Tozaki

Yoshiyuki Okuda

Noriaki Murao

Minoru Kosaka

Shigeru Yasuda

Kenichiro Yasukawa

Fumitaka Kotaka

Yasumasa Fukatsu

Motooki Sugihara

A crosstalk detector for detecting the crosstalk of signals optically read from a recording medium having a plurality of tracks. A changeover circuit selects one of first and second signals generated by first and second oscillators. The amplitude of a signal of a predetermined center frequency is extracted from the selected signal and RF signal and that amplitude is compared with a control signal that inverts at every horizontal synchronizing period of a video signal demodulated from the RF signal.

Crosstalk detector for optically read signals

A plurality of tracks are spirally arranged in a group on an optical disc. The tracks in the group are simultaneously radiated by laser beams. Adjacent tracks in the group are disposed at a radial distance d1, and adjacent spots of the laser beams on the tracks are disposed at a radial distance ds which is smaller than the distance d1.

Reproducing system for an optical disc

A crosstalk detector for detecting the crosstalk of signals optically read from a recording medium having a plurality of tracks. The read signal levels between adjacent tracks at the positions where crosstalk detecting signals are recorded are compared and used to calculate a quantity of crosstalk of the read signals.

An apparatus in which a high vision signal having 1125 horizontal lines per frame is divided into three signals and three channel signals each having 375 horizontal lines per frame are obtained wherein the resultant three channel signals are time base expanded, three channel signals in a base band of 10 MHz are obtained, and the three channel signals are independently recorded onto a medium. A recording medium on which signals is recorded and processed by the above apparatus is provided.

Apparatus and method of high vision signal recording using expansion

A component video signal transmitting apparatus for suppressing any adverse affects caused by noises which are mixed with FM signals which are transmitted after component video signals are frequency modulated. After the color difference signals in the component video signals are previously expanded in level in a high level region, they are frequency modulated and transmitted. The high level expanded color difference signals extracted by demodulation of the transmitted signals are compressed in level at the high level region.

Component video signal transmitting apparatus

A frame number and an instruction signal are inserted in each frame in a video signal. The instruction signal is selected from a predetermined number of field combination instructing signals in each frame, each of the signals represents a combination mode of two fields in the frame. The frame number and the field combination instructing signal are detected. In response to a still signal, a detected frame number and a picture in two fields instructed by a detected field combination instructing signal are stored in a memory for reproducing the picture.

System for reproducing a stationary picture

In a disk player that provides a fast scanning mode in which only selected tracks are tracked by a playback head under closed loop control, a circuit for eliminating the image signal when adjacent tracks have uncorrelated images and the head is under open loop control.

Disk player with a blanking during fast scanning

An apparatus for suppressing noises in a color video signal is constructed to extract a frequency band component of the color video signal, to limit the amplitude of the extracted frequency band component, and to subtract the component, which is limited in amplitude, from the color video signal. Thus, a beat component such as a beat component generated by the interference between the main carrier signal and the color carrier signal of a recording video signal is removed from a video signal obtained after demodulation.

Apparatus for suppressing noises in a video signal

An improved definition television (IDTV) set including a motion sensing circuit for sensing motion of images and generating a motion sensing signal, a motion adaptive Y/C separating circuit separating a composite video signal into a luminance signal and a chrominance signal on the basis of the motion sensing signal, chroma demodulation and matrix circuit generating three primary color signals of red, green, and blue from separate luminance and chrominance signals separated at the Y/C separating circuit, and a motion adaptive scanning line converting circuit for converting a line scanning method of the three primary color signals to a progressive line scanning, while effecting a field or line interpolation operation to the three primary color signals. The television set is characterized by a first selector for alternatively supplying external luminance and chrominance signals supplied from the outside or the separate luminance and chrominance signals to the chroma demodulation and matrix circuit, and a second selector for alternatively supplying, the external luminance signal or a summing signal of said external luminance and chrominance signals, or the composite video signal to the motion sensing circuit.

Improved definition television set with external luminance and

A phase synchronizing circuit for a time axis shift correcting circuit includes a closed-loop phase lock circuit of a phase comparator, a VCO, and a frequency division counter, for providing an output signal phase locked to a reference signal included in an input data signal. Hold circuitry, responsive to a hold instruction signal, is provided to hold the phase relationship of the output signal held just prior to the hold instruction signal for the duration of the hold instruction signal. The hold instruction signal is produced in response to a predetermined condition of the input data signal.

Phase synchronizing circuit for a time axis shift correcting circuit

Method and apparatus of controlling time base for use in an information reading system in which information recorded on a recording medium is read by a pickup, write a read signal obtained by the pickup into a memory device and read-out the signal stored in the memory device by using a read-out reset signal so as to perform the time base control. Upon starting of a track jump operation of the information reading system, phases of generation of the read-out reset signal before and after the starting of the track jump operation is changed with each other.

Time base correction system with coarse and fine correction

A video processing system in which data obtained from sampling an input video format signal according to a first timing signal is written into a first memory according to the first timing signal. Data is read-out of the first memory according to a second timing signal having a frequency equal to N times that of a horizontal synchronizing frequency of the input signal, thereby obtaining data with no time-base fluctuation. M-samples of data from the first memory is then written into a second memory, and data from the second memory is read-out such that the read-out signal from the second memory has a different phase than that of the input video format signal. The system is operable for simultaneously stopping data being read-out of the first memory and data being written into the second memory for a period of time equal to R+kM samples of the input video format signal, wherein R is an integer remainder of N/M, and k is either a positive integer or zero.

Video format signal processing system

A time-base error correction circuit for use in a video disk player, video tape player, or the like, with which all residual time-base error is eliminated. A detector circuit detects the amount of residual time-base error between the reproduced video signal and a write clock signal. A variable delay circuit disposed prior to a memory in which the video signal is stored adjusts the delay of the reproduced video signal accordingly.

Time-base error correction apparatus for video tape or disk player

A scanning method for high-speed reproduction of video data from a recording disk, whereby scanning is executed as a sequence of track jump operations, in which the data detection point of the pickup is caused to jump across tracks of the disk, alternating with intervals of play operation in which data are read from the disk. During each interval of play operation, data obtained from the disk are written into a memory, and thereafter are repetitively read out from the memory to produce an output video signal, until being updated during the next play interval. A display image that is free from noise and disorder is thereby obtained during scanning operation.

Scanning method for disk player

A video information playback system for playing the so called CLV disks which uses a digital video memory for enabling special playback mode operations such as the SLOW mode, the STILL mode, and the FAST mode. In order to simplify the construction of the system, a frequency of write and read clock signals used in the digital video memory is selected n times the horizontal synchronizing signal frequency. A time base servo control part of the system is controlled using a phase difference signal between a playback synchronizing signal and a reference signal whose frequency is 1/n time the frequency of the write and read clock signals. During a track jump operation for a special playback mode operation, a supply of the write clock signal and/or the read clock signal to the reference signal generator is stopped so that the phase difference is maintained constant before and after the track jump operation.

Growing community of inventors

Tokorozawa, Japan

Toru Akiyama