Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: When a head of a pack that can be a start point of consecutive recording is included in an ECC bank, data indicating this is set in an ECCTB (H in FIG. 2). When a head of a pack that can be a start point of consecutive recording is not included in the ECC bank, data indicating this is set in the ECCTB. Thus, when performing consecutive recording, a recording apparatus refers to contents of ECCTBs to detect a consecutive recording start allowing point closest to a point where a user desires to start consecutive recording, and starts the consecutive recording at the detected point.

Abstract: The ratio of an inter-track gap occupied in each track of a magnetic tape is minimized to increase the amount of effective data which can be recorded on one track. In the magnetic recording and playback method for recording digital data on a magnetic tape by a helical scan method and for playing back digital data recorded on a magnetic tape by a helical scan method, in sequence from the start of each track on a magnetic tape, a first recording area containing an audio sector, etc., and a second recording area containing an insert-and-track-information sector, one of a video sector and an audio-video-mixed sector in which audio data and the video data are mixed, a subcode sector, etc., are located, with an inter-track gap provided between the recording areas, and data is continuously recorded on each sector of the first recording area and the second recording area, wherein data in the first recording area can be rewritten after recording onto the magnetic tape is terminated.

Abstract: When MPEG streams are connected, audio data is connected without losing continuity, so that playback data which is not unnatural is obtained. In a case where data of videos of a stream is connected to immediately after another video of another stream and these are edited to create still another stream, if a soundless portion occurs, or if an audio is directly connected to another audio and the audio data leads the video data, unnatural playback data results. Therefore, by inserting still another audio, as audio data at the connection point of the still another stream, corresponding to the video to be erased between the still another audio and still another audio, playback data which is not unnatural can be obtained.

Abstract: Audio signals and video signals are recorded as follows. Three video PES packets, each being formed of one video frame, are combined to form a video editing unit. Then, the video editing unit and the associated audio editing unit are alternately disposed on a magnetic tape. The recorded PES packets are output as a TS as follows. A STC is initialized, and then, PSI packets of a PAT and a PMT are output. TS packets specially used for a PCR for storing the STC are then output at certain intervals. Subsequently, video PES packets are converted into TSs, and the output of the video TSs is started while synchronizing a time obtained by subtracting vbv_delay from the first I-picture DTS with the STC. Audio PES packets are converted into TSs, and the output of the audio TSs is started while synchronizing a time obtained by subtracting the start up delay from the first frame with the STC. Data streams are recorded in the following manner.

Abstract: A magnetic tape recording apparatus uses a rotary head to record digital data on a magnetic tape. The magnetic tape recording apparatus includes a first acquisition unit for acquiring a first group of data including video data, audio data, or search data, a second acquisition unit for acquiring a second group of data including subcode data related to the first group of data, a synthesizing unit for synthesizing data by combining the first group of data and the second group of data so that both groups of data are continuous on the tracks of the magnetic tape without being separated, and a supply unit for supplying the synthesized data to the rotary head so that the synthesized data is recorded on the magnetic tape.

Abstract: A recording and reproducing apparatus for recording and reproducing a data signal on and from a magnetic tape includes a rotary head drum, first and second magnetic heads, third and fourth magnetic heads, a data processor, a data signal decoder, and controller. The magnetic tape is wrapped around the rotary head drum slanted at a predetermined angle. The first and second magnetic heads are provided on the rotary head drum at positions apart from each other by a predetermined rotational angle and have a first azimuth angle. The third and fourth magnetic heads are provided on the rotary head drum at positions apart from each other by a predetermined rotational angle and have a second azimuth angle different from the first azimuth angle. The data processor adds address data to each recording unit of a data signal and outputs the data signal as a recording signal.

Abstract: A gain varying device includes a zero-cross detector for detecting a zero cross or a vicinity thereof in an input analog or digital signal, an analog gain varier for varying the gain of the input analog signal, and a digital gain varier for varying the gain of the input digital signal. In this device, the timing to vary the gain of the analog or digital signal in the individual gain varier is determined in accordance with the zero-cross detection timing, so that smooth switching can be realized in the gain varying operation without generation of any audible noise.

Abstract: A reproducing device for reproducing information from a tape-shaped recording medium, such as a magnetic tape, in which address information and data are recorded on the recording medium on a plurality of inclined tracks. The address information is composed of a track address and a block address. The reproducing device, which reads and reproduces data from the tape-shaped recording medium includes a reproducing unit, an address extracting unit, a memory, a driving unit and a controller. The reproducing unit reads out data from the tape-shaped reproducing medium for data reproduction. The reproducing unit has a rotary head configured for scanning a plurality of tracks of the tape-shaped recording medium for reading out data from the recording medium. The address extracting unit extracts the address information from data read out by the reproducing unit from one scan of the tape-shaped recording medium by the rotary head. The memory stores data read out from the reproducing unit.

Abstract: An apparatus for and a method of calculating a sum of products by which calculation of a sum of products can be performed with a high degree of accuracy. The apparatus includes a data memory for storing data therein, a coefficient memory for storing coefficients therein, and a cumulative adder including a multiplier, a cumulative adder and an accumulator for calculating the products of the data stored in the data memory and the coefficients stored in the coefficient memory in order of magnitude of the exponent parts of the coefficients stored in the coefficient memory and for cumulatively adding the products.

Abstract: A digital signal recording and/or reproducing apparatus which converts an input analog signal into a digital signal and records the digital signal on a recording medium, or which reproduces a digital signal recorded on a recording medium and converts the digital signal into an analog signal has an analog signal level controller and a digital signal level controller connected in front of and after an A/D converter or a D/A converter and the digital signal level controller and the analog signal level controller are controlled in correlation with each other, whereby the S/N ratio of a recording signal or a reproducing signal can be improved.

Abstract: Shielding portions are superposed on opposite sides of an elongated flexible circuit board on which signal wires are formed to provide a flexible shielded signal wire. The flexible shielded signal wire is especially adapted to transmit signals to and from a rotary head drum of a digital audio tape recorder.

Abstract: For recording digital data on a recording medium, an identification code for indicating that the digital data is a series of recording data and an error check code for error checking of digital data forming a block are added for each block of the data. The identification code is inherently contained in the error code to suppress an increase of redundancy.

Abstract: This invention provides an error detecting method, wherein upon decoding a data signal which is formed by such a manner that a data word D is formed of a predetermined number of bits of digital signals, a data block is formed of a predetermined number of the data words D which are successive on a recording or transmission medium, one error check code CRC is provided for a sequence within the data block and another error check code for another series which is different from said series within said data block is provided for a sequence of said data blocks all of erroneous data words detected by another error check code P are regarded as being erroneous. By this method, the erroneous data word can be positively detected.

Abstract: An improved method for detecting and correcting error words in a data block formed of a plurality of words each consisting of a predetermined number of bits of digital signal and including in the block first error check words, second error check words not completely coincident with the first words, and a third error check word, comprising the steps of first executing an error check by the third check word and concluding that an error is in each of the words of the data block when an error is detected, executing second and third error checks by the respective first and second error check words and thereupon setting one of three states namely a state in which each of the words is correct, a state in which each of the words has an error and a state in which it is yet undetermined whether each word is correct or has an error; and when words having errors or undetermined words are included in the first and second words series, changing the state of the words having errors or the undetermined words.

Abstract: There is provided a method of modulating a data bit series consisting of a first value (e.g. 1) and a second value (e.g., 0) whereby a transition as a state transition is caused so as to satisfy the following conditions of (a) to (d).(a) The transition at the boundary portion of the bit cell which is sandwiched by bits 0.(b) The transition at the central portion of the bit cell of bit 1.(c) Among an even number of the bits of 1 which are sandwiched by bits 0, the transition is inhibited at the central portion of each bit cell of the last two bits of 1 and the transition is caused at the boundary portion of these two bit cells of 1.(d) When at least one bit in a pattern which starts from the two bits of (01) appears at a location next to an even number of the bits of 1 subsequent to bit of 0, the transition is caused at the central portion of the bit cell of bit 0 between these two bits.