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Data-conversion

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Data conversion

Details

Inventors: Wright, Derek T.;
Assignee: British Broadcasting Corporation (London, GB)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Young; Brian K.
Attorney, Agent or Firm: O'Connell; Robert F.

In a method for converting n data input bits to n data output bits, groups of m data input bits from an input data buffer (10) are used as address input for a plurality of identical substitution look-up tables (20 to 27). Each look-up table (20 to 27) has a plurality of groups of m data output bits stored at a plurality of locations in the table. The output bits held at each location within the look-up tables (20 to 27) are dependent on a control word taken from a control word register (11).

DETAILED DESCRIPTION It is anticipated that a data conversion method and apparatus embodying of the invention will be used in the field of broadcasting where the conversion apparatus used at the receiving end of a data transmission link is likely to be replicated many times.
It is, therefore, desirable that the second unit, which performs the "inverse" conversion should be made as simple and inexpensive as possible.
Any consequential complication to the transmission or forward conversion unit which may result can be accepted.
A simple and inexpensive "inverse" conversion apparatus may be constructed using the data conversion method of the invention.

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