Display apparatus

An input sound signal from a source (1) is displayed visually using a plurality of arrays of light sources (8), preferably arranged in rows and columns. Signals representing the frequency content of the sound input are obtained at successive times and each signal is supplied in turn to the arrays of...

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Bibliographic Details
Main Author ANTHONY JOHN BURTON
Format Patent
LanguageEnglish
Published 16.02.1983
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:An input sound signal from a source (1) is displayed visually using a plurality of arrays of light sources (8), preferably arranged in rows and columns. Signals representing the frequency content of the sound input are obtained at successive times and each signal is supplied in turn to the arrays of light sources, so that the arrays, when energised, show the current frequency content on one row and the frequency content at at least one earlier time on another row. The input signal is clipped (4) and the frequency is determined indirectly (in 6) by measurement of the time intervals between successive crossings of a datum line by the clipped signal. Accumulator devices (12) are associated with each column and the accumulated signals are shifted at inter
Bibliography:Application Number: GB19820018878