Matsushita Electric Industrial Co., Ltd.

Nippon Hoso' Kyokai

Kunio Suesada

Toshiaki Koya

Akira Iketani

Kunio Sekimoto

Chojuro Yamamitsu

Tadashi Nakayama

Ichiro Ogura

Toshihiro Uehara

Masaaki Higashida

Katsuhiko Yamamoto

Keiichi Ishida

Shiro Tsuji

Yoshinobu Oba

Sigekazu Togashi

Koso Takeuchi

In an apparatus and method for recording inputted digital video and audio signals of one field, which are synchronous with each other, onto a plurality of inclined tracks of a magnetic tape using a plurality sets of helical scan type magnetic heads provided in a rotation head drum at predetermined angle intervals, a read clock is generated. A read address of a first field memory is generated based on the read clock, so that the inputted digital video signal is read out and recorded onto both end portions of each of the inclined tracks of the magnetic tape, after starting recording the inputted digital video signal of one field onto an end of the inclined track, and ending recording the inputted digital video signal of one field onto another end of the other inclined track. On the other hand, a read address of a second field memory is generated based on the read clock, so that the inputted digital audio signal is read out and recorded onto the middle portion of each of the inclined tracks.

Apparatus and method for respectively recording digital video and audio

Method and apparatus for recording a plurality of audio channels on segmented tracks of a tape by rotary heads. The audio channels to be recorded are allocated to recording sectors provided for the individual audio channels on the basis of the relation between the number of the audio channels and the number of the segmented tracks, so that each recording track necessarily includes the individual audio channel recording sectors uniformly distributed in the longitudinal direction of the tape, and the two-dimensional distance between the sectors on which the same audio channel is recorded can be maximized on the tape. Thus, an adverse effect of an error attributable to a dropout and/or a scar formed on the tape can be dispersed, thereby achieving high capability for error correction.

Method and apparatus for rotary-head type signal recording and

A recording apparatus of the present invention includes selective guard adding means for predicting, at the time of editing, positions of adjacency of new tracks to previously recorded tracks obtained at the time of completion of new track recording, and adds, at the time of editing, guards to locations where disturbance due to residue of erasing of the same azimuth might occur in order to remove or reduce the disturbance due to residue of erasing of the same azimuth caused at the editing point. When performing reproduction from a recording medium whereon tracks recorded by heads of at least two kinds of azimuth angles are disposed alternately and a plurality of tracks are handled as one recording unit and recorded, a reproducing apparatus of the present invention is so configured that the center of each of heads located at both ends of reproducing heads may be shifted to the inside as compared with each corresponding recording track. When disturbance due to the residue of erasing of the same azimuth occurs at the editing point, therefore, more signals of tracks to be originally reproduced can be reproduced, resulting in a greater resistance to disturbance of the same azimuth.

Magnetic reproducing apparatus and magnetic recording apparatus with

An apparatus is described for rearranging the relative positions of data samples of a digital video signal within each field of the video signal, for use in a digital VTR in which alternate samples are separated into two different recording channels to be recorded on different tracks of a recording medium. The apparatus includes an intra-line shuffling circuit and a field memory into which output data from the shuffling circuit are written, such that adjacent samples which are of the same channel and are located mutually adjacent in the same line of the video signal are read out from the memory and recorded on respectively different tracks of the recording medium, thereby ensuring that if a sample is lost due to a read error, the adjacent samples of the same channel will always be available for use in interpolation processing to compensate for the lost sample.

Data rearrangement processing apparatus for digital video signal

A digital component video signal processor or a digital VTR which can record/reproduce both an extended 4:2:2 signal based on sampling at 18 MHz and a 4:2:2 signal based on sampling at 13.5 MHz while minimizing dummy data to be generated upon recoding/reproduction. The extended 4:2:2 signal and the 4:2:2 signal are changed over by switches, and the output sides of memories use timing signals based on a clock signal of 36 MHz whereas timing signals based on the clock signal of 36 MHz and timing signals based on a clock signal of 27 MHz are changed over by a switch on the input side of the memories, whereby each of an extended 4:2:2 signal and a 4:2:2 signal at a rate of 288 Mbits/sec can be outputted to a terminal.

Word rate conversion processing device for processor circuit for

Recording digital VCR and a reproducing digital VCR for recording and

A sampling frequency down-converting apparatus low-pass converts a digital picture signal sampled at a sampling frequency of 8 Fsc by a thinning out operation into the digital picture signal sampled at a frequency of 4 Fsc, and a sampling frequency up-converting apparatus high-pass converts the digital picture signal sampled at 4 Fsc into one sampled at 8 Fsc by interpolation. If the signal is wider in the required zone than the conventional NTSC signal and the signal like the ATV signal, the transmission and the recording may be effected without the deterioration of the frequency characteristics.

Sampling frequency down-converting apparatus

Reproduction apparatus having means for initializing flag memories

In a recording/reproducing apparatus for digital composite video signal, a phase sync circuit (110) for synchronizing color subcarrer phases, a sync/ID adding circuit (9), a sync/ID detecting circuit (12), a memory control circuit (13), a memory (14), and a phase relocating circuit (111), are provided for obtaining correct hues of the digital composite video signal when high-speed reproducing. When high-speed reproducing, the memory control circuit (13) is operated such that corresponding sampled signals in the memory (14) are stored as the same address with the same color subcarrier phase. As a result, a high image quality is achieved by the recording/reproducing apparatus even when high-speed reproducing with low manufacturing cost.

Recording/reproducing apparatus for digital composite video signal with

A digital type VTR or the like image signal recording and reproducing apparatus using sub-Nyquist sampling on the image includes an interpolator circuit for carrying out interpolation on a signal based on correlation between image signals in neighboring fields. The interpolator circuit is by-passed when high speed reproducing is carried out.

Sub-nyquist sampling apparatus with improved effects processing

A systematic method and apparatus for constructing a run length limited code in which the minimum number of continuous bits of the same binary value is constrained to d and the maximum number thereof is constrained to k. In converting m-bit data words to n-bit code words (n&gt;m) to construct the run length limited code, selection means for n-bit code words usable to meet the d, k-constraint and a concatenation rule of the code words selected by the selection means are introduced. The selection means divides each of 2.sup.n n-bit bit sequences into a leading block L having l continuous bits of the same binary value, an end block R having .gamma. continuous bits of the same binary value and an intermediate block B having b(=n-l-.gamma.) bits between the blocks L and R. Only those n-bit bit sequences in which the blocks B thereof completely meet the d, k-constraint and the blocks L and R thereof meet conditions uniquely defined for given d and k are used as the code words. Consequently, a systematic method for constructing the run length limited code is provided.

Method and apparatus for converting a run length limited code

Disclosed is a digital recording and reproducing apparatus for television signal, which is designed to record and reproduce by sampling a television signal at a frequency lower than the Nyquist frequency, by dividing the sampled signal into blocks each of which is composed of adjacent plural sampling points, by orthogonally transforming in each block, and by subjecting the orthogonally transformed signal to weighted quantizing. The apparatus has achieved the reduction of recording bit and decrease of error propagation rate simultaneously so as to be applicable to recording and reproduction even in a home use VTR.

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Ikoma, Japan

Kunio Suesada