Pioneer Electronic Corporation

Tutomu Banno

Minoru Kosaka

Masahiro Nakajima

Junichi Nakata

A video disk player includes a memory for storing a video data signal, a Y/C separator for separating the video data signal stored in the memory means into a luminance signal and a chrominance signal, a sync generator for generating sync signals, a selecting circuit for receiving the luminance signal and the video data signal and for selecting one of the luminance signal and the video data signal as an output signal, the selecting circuit selecting the video data signal as the output signal during a selected horizontal scan period, and a mixer for mixing the sync signals with the output signal and the chrominance signal.

Video disk player comprising a signal circuit for selecting one of a

A special-reproduction processor circuit of a video disk player includes a memory for storing a video data signal, a Y/C separator for separating the video data signal stored in the memory into a luminance signal and a chrominance signal, a sync generator for generating sync signals, a selecting circuit for receiving the luminance signal and the video data signal and for selecting one of the luminance signal and the video data signal as an output signal, the selecting circuit selecting the video data signal as the output signal during a selected horizontal scan period, and a mixer for mixing the sync signals with the output signal and the chrominance signal.

Video disk player comprising a signal selection circuit for selecting

A spindle servo circuit controlled according to a time base. Fine time base tuning is performed in a clock driven CCD. In a scan mode, tracks are alternately reproduced and jumped. The fine tuning is turned off at the start of jumping (which occurs after a full video field has been written into a video memory) and the center frequency of a VCO clock is decreased so as to slow the shifting of the CCD.

Scanning system in information reproducing apparatus

A time base control system for a spindle servo motor in which the time base is both coarsely controlled and finely controlled. According to the invention, when the recording head is alternately tracking and jumping tracks, the controllable range of the fine tuning is widened and the course tuning is gradually increased.

Time base control system for a spindle servo

A recording disk playback apparatus capable of playback of recording disks having digitized audio data recorded thereon, (CDs), disks having digitized audio data together with audio and video data recorded by frequency modulation recorded thereon (LDDs), and disks having only video and audio data recorded by frequency modulation thereon, (LDs), is provided with means for discriminating the type of disk which is to be played and for producing signals indicating the disk type, for switching control purposes. The discrimination means will reliably distinguish between LDs and LDDs, even if these are of identical size.

Recording disk data playback apparatus

A recording disk data playback apparatus capable of playback of recording disks having digitized audio data recorded thereon and disks having audio data recorded in analog form, by FM modulation, as well as disks having both digital and analog forms of audio data recorded thereon (together with video data), is provided with a switching circuit for selecting digital audio signals to be supplied to left and right channel output terminals respectively with the switching configuration being designed to minimize crosstalk, and a switching circuit whereby either digital audio signals or analog-derived audio signals can be selected to be supplied to a single pair of (left and right channel) output terminals.

A recording disk data playback apparatus capable of playback of recording disks having a video signal usually with an audio signal recorded thereon by frequency modulation, together with audio data modulated as a pulse train superimposed thereon, includes a phase-lock loop circuit for generating a read-out clock signal to read out from a memory the playback digital audio data, in which that data has been temporarily stored, with the loop circuit including a filter whose cut-off frequency is selected to be lower than the maximum frequency of the bandwidth of a tangential servo system which controls movement of a data sensing light spot tangential to the recording tracks. Jitter which cannot be fully corrected by the tangential servo system is thereby eliminated.

A recording disk playback apparatus which is compatible with playback of both compact audio disks (CDs), having only a digitized audio signal recorded thereon, and recording disks having video and audio signals recorded by frequency modulation thereon together with a superimposed digitized audio signal (LDDs), includes means whereby a read-out clock signal which reads out temporarily stored digitized audio data from a memory is held fixed in frequency when a CD is being played, with closed-loop control of the speed of a CD drive motor being also executed, to thereby eliminate jitter in the demodulated audio signal, while during playing of an LDD the read-out clock signal is phase-locked with a playback clock signal.

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Saitama, Japan

Tutomu Banno