| 摘要 |
967, 847. Editing systems for television signal recordings. AMPEX CORPORATION. Sept. 4, 1962 [Oct. 2, 1961], No. 33913/62. Heading G5R. In order to erase part of a television recording on magnetic tape and record in its place new material in synchronism with information remaining on the tape, an electronic editing system is provided. Fig. 1 shows part of such a system which is similar to that contained in Specification 967,846. Circuit controls are described which on the actuation of a start control initiate two delays. At the end of the first delay of fixed length the video erase head 20 is actuated. The second delay is predetermined by an integral number of edit pulses which may be provided as described in Specification 915,254 [Group XXXV] occurring coincidentally in time with the television vertical sync pulses and picked up from the tape by head 33 so that recording is commenced by heads 16 in synchronizm with the tracks remaining on the tape. At a later time measured from the start of video recording, the audio erase head 31 is actuated and after a further fixed delay audio recording begins via head 30. On the actuation of a stop control audio recording ceases immediately, video erase stops after a fixed delay and video recording stops after a predetermined number of edit pulses to maintain synchronism. The erase head has a separate edit pulse track portion 24 as described in Specification 934,972 which may be energized for normal recor ding and switched off for electronic editing. |
