Sharp Kabushiki Kaisha Corporation

Hironobu Katayama

Kenichi Shiraishi

Hiroaki Nogami

Takamasa Uejima

Kazuya Aoki

Koichi Kawaguchi

Takeshi Kawamura

Saori Akimoto

Naoji Izumi

A digital recording/reproduction method and apparatus includes a data detection circuit for detecting a frequency of occurrence of a specific data value contained in an information signal, and a phase controller for controlling a phase of a sampling clock based on the frequency of occurrence of the specific data value detected by the data detection circuit. A threshold value in the data detection circuit is adjusted to maximize the frequency of occurrence of the specific data value contained in the information signal, and the phase of the sampling clock is controlled to minimize the amount of change in the frequency of occurrence of the specific data value contained in the information signal.

Digital recording/reproduction apparatus

The waveform equalizer comprises equalizing means for equalizing the waveform of the reproduction signal based on the equalizing coefficient, reference signal-generating means for extracting an isolated wave from the reproduction signal to generate a reference signal based on the isolated wave and equalizing coefficient control means for carrying out an operation of the equalizing error of the isolated wave of the reproduction signal whose waveform has been equalized by the equalizing means from the reference signal, to control the equalizing coefficient based on the equalizing error, wherein the reference signal is generated based on the reproduction signal, and the equalizing coefficient is determined in response to the reproduction signal using this reference signal.

Digital recording/reproduction apparatus including a digital equalizer

A digitally recording and reproducing apparatus simultaneously records two kinds of digital signals of an identical video program, generated by high-efficiency coding, or a relatively high bit-rate signal and a relatively low bit-rate signal, onto the approximately the same positions on the tape. The apparatus is constructed so that the low bit-rate signal is commonly used for normal playback and search-playback. Further, the recording time can be lengthened by reducing the recording bit-rate.

Digital recording and reproducing apparatus which multiplexes and

A digital recording and reproducing apparatus records two kinds of digital signals of an identical video program, generated by high-efficiency coding, or a relatively high bit-rate signal and a relatively low bit-rate signal, onto approximately the same positions on the tape. When the low bit-rate signal is commonly used for normal playback and search-playback or when it is used only for the search-playback, the amount of the search-playback data is adjusted so that data on a number of frames to be a unit for edit work may be recorded onto an integer number of tracks.

Recording apparatus which adaptively records amounts of low resolution

A digital VTR which is able to record a band-compressed signal having a bit-rate of 17 to 60 Mbps of a program while creating a low-bit-rate signal (1.5 to 5 Mbps) having the same program content as well as utilizing the low-bit-rate signal as a signal for the special playback. Variable speed playback data for a certain speed, which is recorded in the limited recording areas for variable-speed playback mode, is adapted to be used for playback at another speed in the variable-speed playback mode. The data structure of variable-speed playback data is adapted to change depending on the image areas on the image frame. Either of these embodiments or the combination of them, improves the quality of a reproduced picture during variable-speed playback mode in which a less amount of data is available than that of data read out at the time of a normal playback mode.

Recording and playback system for variable speed playback wherein more

A magnetic recording and reproducing apparatus which includes a set of loading members for drawing out a magnetic tape accommodated in a tape cassette and wound around a set of reels disposed to contact the same plane. The tape storing portions of the tape cassette are directed along part of the outer peripheral surface of a rotary head cylinder in an approximately M-shape, and a single inclining member is provided in the vicinity of one tape storing portion for causing a tape travelling reference face of the magnetic tape drawn out from the tape storing portion to be inclined. The first loading member corresponding to the tape storing portion is rotatably supported at right angles with respect to the tape travelling reference face of the magnetic tape inclined by the inclining member, while the other loading member corresponding to the other tape storing portion is rotatably supported at right angles with respect to the tape travelling reference face of the magnetic tape drawn out from the other tape storing portion.

Growing community of inventors

Noda, Japan

Hironobu Katayama