Pioneer Electronic Corporation

Pioneer Video Corporation

Universal Pioneer Corporation

Takashi Okano

Toru Akiyama

Masao Kanda

Kazuo Kuroda

Tetsuo Akiyama

Tohru Akiyama

Shin-ichi Kojima

In a self-luminous display panel driving system, one field of a composite video signal is divided into N sub-fields, luminance of each pixel is set by a pixel data. The pixel data comprises N bits corresponding to the number of the sub-field. A present pixel data of a pixel is compared with a prior pixel data of a same pixel and a change between a data of a highest luminance and a data of a luminance of a one digit lower is detected. An inter-frame change signal is produced when a change is detected. In response to the inter-frame change signal, the present pixel data is corrected so as to change the sub-field of the present pixel data.

Method for correcting pixel data in a self-luminous display panel

A moving picture decoding device includes: unit for successively receiving compressed digital picture data in a forward reproduction order; unit for constantly storing the compressed picture data corresponding to a predetermined reproduction time period from a picture currently reproduced; unit for producing reproduction pictures including intermediate pictures, in time, of the compressed picture data by picture predictions using the compressed picture data stored in the storing unit; unit for designating output timings of the reproduction pictures; and unit for successively outputting the reproduction pictures at the output timings designated by the designating unit so as to form moving picture. When reverse order reproduction is instructed, the producing unit produces the reproduction pictures in an order reverse to the forward reproduction order and the outputting unit outputs the reproduction pictures in the reverse order.

Moving picture decoding device having a compressed picture data memory

An apparatus for playing CLV disks is provided with a speed signal generator for generating a speed signal having a frequency corresponding to the rotational speed of the disk, and the rotation of the disk is controlled so that the frequency of the speed signal equals to a predetermined frequency independently of the radial position of an information reading point of a pickup, thereby the period of a search operation of the apparatus is shortened.

Disk playing apparatus for playing CLV disks

A video signal reproduction apparatus with time base error correction and synchronization correction. The synchronization correction circuit is used only where the condition of the recorded video signal is such that synchronization correction is necessary. The latter circuit includes an image memory for storing a field of video data. The video data input to the image memory is at a relatively low data rate to enable use of a relatively low capacity image memory.

Picture image reproducing apparatus having a sampling circuit for

A plurality of original video signals of channels are processed with a frame unit at intervals of a predetermined cycle in time sequence through the use of time-division multiplexing operation so as to produce a single time-division multiplexed video signal, two interlaced fields constituting one frame of the multiplexed video signal are composed of two fields of the original video signal spaced in time sequence apart from each other at intervals of a predetermined number of fields in the original video signal. In reproduction, in response to the motion of the picture, the field repetition reproducing operation and the frame repetition reproducing operation are selectively conducted so as to improve the vertical picture resolution even when the original video signal represents a picture containing a motion.

Multi-channel video signal transmission/reproduction system

A spindle servo unit for disk playing device detects a synchronizing signal in an information signal read from a recording disk and generates a signal synchronized with the detected synchronizing signal. The generated signal is frequency-divided. An error signal is generated in accordance with the phase difference between the frequency-divided output, and the error signal is supplied to rotate the recording disk.

Spindle servo unit for disk playing device

In a data reading device of the type in which a servo loop controls the movement of a reflection mirror to control the position of the data detection point, a second servo loop is used to return the mirror to its initial position when the amount of deflection of the mirror exceeds a predetermined range.

Data reading device having servo controlled position reset

A recorded information reproducing apparatus, such as a video disk player, has a memory for storing video data of one field. The reproducing apparatus generates an address access detection signal when the absolute value of the difference between a generated write address and a generated read address of the memory decreases less than a predetermined value. The address access detection signal serves to change the phase difference between the synchronous signal in the read video signal and a standard synchronous signal which is synchronized with the read clock signal, thereby finely adjusting the time axis and changing the synchronization.

Recorded information reproducing apparatus with reading and writing

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 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.

System for playing video information recording disks, capable of special

Information recorded on a non-CAV type recording disk is detected by a pickup device having an information reading point repeatedly moved during spaced intervals in a radial direction across recording tracks on the disk in response to a special playback operation command. Predetermined portions of the information so picked up, during periods between track jump operations, are entered into a memory device and the stored information read out therefrom to provide playback information for the special playback operation. The information reading point is moved by the track jump operations to positions establishing a time period sufficient to enable stabilization of a time base error in the information, caused by said track jump operations, before entry of the information into the memory is begun.

Method and system for retrieving video information from a non-CAV type

A phase comparison circuit for producing a voltage error signal proportional to the difference in phase between a reference signal and an input signal. The reference signal is in the form of a sawtooth wave signal having a fixed frequency and fixed period. The input signal may vary widely in frequency. Sample pulses are derived from the input signal and are used to sample the ramps of the sawtooth signal to produce the error signal. When the frequency of the input signal differs from that of the reference signal to such an extent that the sample pulses do not occur during the ramps of the sawtooth signal, the sawtooth signal is repeatedly shifted in phase by one of two fixed amounts, depending upon the direction of the frequency difference, until the sample pulses occur during the ramps of the sawtooth signal.

Phase comparator

A method for time axis control for performing both coarse and fine time axis adjustment in accordance with relative speeds of a recording disk and a playback unit while the playback unit is recording or reproducing signals on or from the disk, wherein a color image is displayed during a scanning operation, which displayed image is natural in appearance. The pickup unit is first caused to follow a track formed on the recording medium in a tracking control operation. Repetitive track jumping operations are then effected over successive tracks by moving the pickup unit. For the track jumping operations, a time constant circuit within a circuit which performs the fine time axis adjustment is reset at least for the duration of each track jumping operation.

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Saitama, Japan

Takashi Okano