Sony Corporation

Shigeyuki Satomura

Yoshizumi Inazawa

Toshihiko Takahashi

Toshiyuki Tani

Azusa Katsumata

An apparatus for reproducing a recorded digital signal suitable for use in a data recorder or the like, wherein error detecting signals (CRC) are generated for respective reproduced header portions of a main data area and a sub-data area formed in each track, the error detecting signals (CRC) are counted for a predetermined period, and the counted value is compared with a predetermined value. A data error condition is determined in accordance with the comparison result, so that it is possible to simplify the circuit arrangment and detect an error condition in the recorded digital data.

Apparatus for reproducing a digital signal

Apparatus including a rotary head accurately reproduces a digital signal recorded on a tape, even when the tape runs at high speed. Transitions of a reproduced signal are detected, intervals corresponding to the transitions are counted on the basis of a predetermined reference signal, and the rotation of the rotary head is controlled in response to the counted value so that the relative speed between the rotary head and the tape is held constant, notwithstanding changes in the absolute speed of the tape, as in the fast-forward mode.

Dual servo system for rotating tape head control

An apparatus for reproducing digital signals recorded on a magnetic or other recording tape includes a servo mechanism which is effective, when the tape is transported at a high speed in either a fast-forward or rewind mode, to maintain a relative speed between the tape and a rotary head that is substantially the same as that in the normal playback mode. Moreover, in the rewind mode, the rotary head is rotated in the direction opposite to that in the normal playback mode, while the absolute value of the relative speed remains the same as that in the normal playback mode. Further, the digital signals reproduced by the rotary head in the rewind mode have their sequential order reversed.

In a recording/reproducing apparatus, a program identifying number is recorded in a beginning portion of each of a sequence of programs recorded on a record medium during a first recording operation, and a program start signal is recorded in a beginning portion of each program recorded in a second recording operation and thereafter. Subsequently, in a renumbering operation, each of the recorded program identifying numbers and/or program start signals is detected, with high speed movement of the record medium therebetween, and the previously existing recorded program identifying numbers and/or program start signals are replaced by a properly ordered sequence of program identifying numbers on the record medium.

Recording/reproducing apparatus

Apparatus for reproducing digital signals recorded on a recording tape comprises a rotary drum about which a recording tape can be trained, a rotary head mounted in the drum, a transport mechanism for transporting the tape over the drum and rotating the head so that a relative speed is established between the head and the tape and the head scans the tape and generates reproduced digital signals in response to digital signals recorded on the tape, and a mode-control mechanism for controlling the transport mechanism so that the tape is transported over the drum at an absolute tape speed that can be varied. A servomechanism responsive to variations in the absolute tape speed adjusts the transport mechanism so that the head acquires a rotary speed such that the relative speed is restored to and maintained at a substantially constant value, not withstanding changes in the absolute tape speed effected under the control of the mode-control mechanism.

Growing community of inventors

Tokyo, Japan

Shigeyuki Satomura