Willi Studer Ag

Studer Revox Ag

Daniele P Pelloni

Roger Lagadec

Guy W McNally

Marco Nai

Alex Ruegg

Andreas Koch

A method and apparatus for generating a further scanning frequency from an input scanning frequency and an output scanning frequency which is located very close to an input scanning frequency or output scanning frequency. A further scanning frequency is derived from the input scanning frequency and the output scanning frequency. Scanning values of an input scanning sequence are converted by a first conversion into scanning values of a further scanning sequence with a further scanning frequency. The scanning values of the further scanning sequence are converted into scanning values of an output scanning sequence. An adaptation on one of the two conversions of the scanning frequencies is then performed and a scanning rate conversion with a predetermined ratio is performed on the other of the two conversions. Phase errors and deviations of the scanning frequency, which may be contained in the further scanning sequence, are compensated for by delaying the scanning values and by performing a periodically occurring change-over process.

Method and apparatus for converting scanning values of an input scanning

The method and apparatus permits processing, for example, editing or synchronizing data sequences without using special marking devices and marking tracks for identifying preselected locations. For this purpose, a preselected partial data sequence is formed from a predetermined data sequence and serves as a reference partial data sequence. Such reference partial data sequence is utilized as a basis for comparison with further partial data sequences originating from the same or different data sequences for retrieving or identifying operations in connection with, for example, the joining, inserting or synchronizing of data sequences.

Method of, and apparatus for, identifying a predetermined location

Method and apparatus for converting an input scanning sequence into an output scanning sequence, where scan values of an input scanning sequence occurring with an input scanning frequency are converted into an output scanning sequence whose scan values occur with an output scanning frequency. To process scanning sequences with alternating scanning frequencies with limited computing and storage capacities, a single one-stage digital filter is provided for processing the input scanning sequence using a limited number of filter coefficients, further filter coefficients supplied thereto by calculation from existing filter coefficients.

Method and apparatus for converting an input scanning sequence into an

Equidistant timing pulses are counted during the time between the arrival of a first pulse edge of a first signal sequence and the arrival of a following second pulse edge of another signal sequence and are averaged to a mean value with equidistant timing pulses of an immediately preceding count between two pulse edges of the two signal sequences. The continuously formed mean values are accumulated with mean values of preceding cycles and in each case the least significant bit is further processed.

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Zurich, Switzerland

Daniele P Pelloni