Victor Company of Japan, Limited

Yutaka Tanaka

Takeo Ohishi

Tomoyuki Shindo

Tsuyoshi Suzuki

Yasuaki Yamada

Yutaka Ichinoi

A packet recording/reproducing system is provided which records or reproduces packets on or from tracks formed in time sequence on a magnetic tape. In a recording operation, the packet recording/reproducing system adds to input packets time stamps whose values are synchronous with packet arrival time control clocks produced by the system. The timing with which the packets are recorded on the magnetic tape is controlled by the arrival time control clocks so that a given number of the packets inputted at high data rate are recorded within a one-track area, a two-track area, or a one-track over area defined across at least two of the tracks, thereby minimizing the loss of capacity of the magnetic tape.

Packet data recording/reproducing system

Packet data system recording time stamps and packet data on tracks

A digital TV broadcasting signal is demodulated to obtain a bit stream containing at least a first packet of a first program specific information concerning all TV programs conveyed by the digital TV broadcasting signal and first packets of the TV programs themselves. Selection data is entered for selecting at least one of the TV programs. In response to the selection data, only second packets are selected from among the first packets. The second packets contain only data of the selected TV program. The second packets are decoded. Further, the first packet and the second packets are output without decoding and accepted. The first program specific information is modified into a second program specific information concerning the selected at least one of the TV programs. The modification is executed after the first packet and the second packets are output. Or, the modification is executed before the first packet and the second packets are accepted.

Apparatus and method of receiving broadcasted digital signal

A signal reproducing apparatus operates on a magnetic tape on which information is recorded according to one of first, second, and third predetermined recording formats. The signal reproducing apparatus includes first and second heads. The first head reproduces a signal from the magnetic tape, and has a first predetermined azimuth angle. The second head reproduces a signal from the magnetic tape, and has a second predetermined azimuth angle different from the first predetermined azimuth angle. A first detector detects a level of the signal reproduced by the first head. First components are separated from the signal reproduced by the second head. The first components have frequencies in a first predetermined band. A second detector detects a level of the first components. Second components are separated from the signal reproduced by the second head. The second components have frequencies in a second predetermined band separate from the first predetermined band. A third detector detects a level of the second components. A decision is made as to which of the first, second, and third predetermined recording formats the signals reproduced by the first and second heads correspond to in response to the levels detected by the first, second, and third detectors.

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Yokosuka, Japan

Yutaka Tanaka