Music – Accessories – Recording devices
Patent
1979-12-07
1983-07-12
Witkowski, S. J.
Music
Accessories
Recording devices
84477R, 346 33R, G01D 940, G09B 1502, G10G 304
Patent
active
043924093
ABSTRACT:
A system for transcribing a sequence of input analog signals having characteristic frequencies and durations into indicia which visibly reflect the frequencies and durations of the input analog signals. The system uses the principles that the frequency of an analog signal can be determined from the number of zero crossings the signal makes in a predetermined time period and that the durations of the input analog signals can be determined from the number of successive time periods that the determined frequencies remain the same.
In the preferred embodiment, the system transcribes successive musical tones into corresponding musical notes. A microphone produces electrical signals corresponding to the musical tones and a frequency digitizer circuit produces a digital signal train comprising a digital pulse for each zero crossing of the electrical signals. A counter counts the number of pulses in the digital signal train and, at predetermined time intervals, a timer transfers the contents of the counter to a count buffer to store as counts the frequencies of the musical tones during each time interval. A programmed digital computer accesses the counts in the count buffer and determines the frequency of each musical tone from the values of its corresponding counts and the duration of each tone from the number of successive counts of the same value. The digital computer also produces an indicia code reflecting the frequency and duration of each note. From the indicia codes, a printer produces, on an output medium, the musical notes in their proper positions on a musical staff.
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Coad, Jr. Peter
Wilensky David E.
The Way International
Witkowski S. J.
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