Pioneer Electronic Corporation

Kenichiro Yasukawa

Shigeru Yasuda

Junichi Yoshio

Masayuki Yoshida

Toshio Hirano

Toru Akiyama

Tsutomu Nakamura

Yasumasa Fukatsu

Kenitiro Asami

A method of reproducing a last portion for a disk playing apparatus includes a step for memorizing in a memory device address data corresponding to a first recording position on a recording disk at which information under reproduction is recorded, in response to a memorization command. In response to a last scene reproduction command, playing operation of the disk playing apparatus is started from a second position which is, in order of recording, before the first recording position if the address data is memorized in the memory device. By the feature of staring the playing operation from the second position, generation of discontinuity between a part of a program recalled by a user and a rest of the program is prevented.

Method for playback of a portion of a recorded disk played before

A method for operating an optical disk player, having a memory for storing at least one frame of a video signal, under control of a programmable system controller. The disk player may be operated to set the apparatus in a pause mode at the very beginning of the desired program area on the disk. The disk player also may be operated to produce still pictures from information stored in the memory, rather than directly from the disk. The disk player can be controlled to return to a last scene that was viewed by utilizing signals uniquely identifying the particular disk and particular address on the disk where the last scene was recorded. The disk player can be operated to retrieve a last scene in response to the duration of disk reproduction time that was passed.

Method for reproduction of stored video signals with disk reproducing

The invention relates to improvements in video reproduction techniques, particularly with respect to video disk recordings. The disclosed apparatus has the capability of storing video in a video memory for subsequent single or repeated playback. Video memory readout may be used to mask a search function, or may accompany the audio playback from the same or a different disk. A strobe-readout technique is also disclosed wherein the video memory is rewritten at user defined intervals which are typically small multiples of the video field or frame rate.

Search system and special reproduction system for information

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 method for performing sound field enlargement in a digital audio reproducing apparatus such as a compact disc player. A sum is calculated between each received pair of right-channel and left-channel data read from the disc, and the resulting sum data is stored in a random access memory. After a predetermined delay time, the sum data are read from the memory and multiplexed with the then-incoming right-channel and left-channel data. The resulting data stream is converted to respective right-channel, left-channel, and delayed-sum analog signals, which are then subjected to low-pass filtering. The filtered signals are processed in a conventional manner to yield outputs signals which, when reproduced, produce a perception of an enlarged sound field.

Sound field enlarging device and method

A PCM signal demodulating circuit in which a PCM signal corresponding to a code representative of a first sample value obtained by sampling an analog signal with a first sampling frequency is processed to obtain the first sample value, thereby to calculate a pseudo sample value equivalent to a second sample value obtained by sampling the analog signal at a second sampling frequency higher than the first sampling frequency. This is accomplished by passing the PCM signal through a digital filter, a digital-to-analog converter, and a low-pass filter connected in cascade.

PCM signal demodulating circuit

A digital audio system constructed to reproduce an audio signal by separating low frequency components of a PAM (Pulse Amplitude Modulation) signal made up of pulses being produced at predetermined time intervals and representing a predetermined audio signal, the digital audio system including a pulse width control means for varying the pulse width of each of the pulses of the PAM signal in accordance with a predetermined command signal, whereby an automatic fade in and fade out operation is performed.

Growing community of inventors

Saitama, Japan

Kenichiro Yasukawa