Robert Boschgmbh

Hannfried Preissler

Jurgen Heitmann

Rolf Loos

The head wheel of a video recorder-reproducer is equipped with a set of four advanced read heads, in addition to the usual sets of four read and write heads, so that each advanced read head can read the contents of an oblique track on a magnetic tape on which one of the write heads will be able to record thereafter and which will be read still later by one of the normal read heads. The advanced read heads are so located that while one of them is reading a track, one of the normal read heads is out of contact with the tape. The advanced read heads are used for reading out audio sections of video tape tracks for processing and rerecording in accordance with a previously known processing procedure used in editing newly recorded video tapes for better audio recording. The normal read heads are available for an after-check of the rerecorded audio. A switching system timed by the rotation of the head wheel disconnects each of the normal read heads in a sequence during the periods in which they are respectively out of contact with the tape and at the same time the switches in one of the advanced read heads for scanning the mid-portion of the recorded tracks where the audio sections of the recording are located.

Apparatus including a head wheel carrying advanced read, write and

In a system for correction of digital audio data, read out from a magnetic tape in code blocks each containing a number of data words together with first check words and a number of code blocks together form a data field for the columns of which second check words are formed and recorded and wherein audio data are recorded in first and second recordings of each code block, the data read out from the tape are first provided with corrections and error flags for the presence of uncorrectable words by means of the first check words and thereafter the data words are subject to selection of the largest number of error free code blocks from the first and second recordings for submission to error correction with reference to the data field second check words.

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Darmstadt, Germany

Hannfried Preissler