Music – Instruments
Patent
1979-08-22
1982-09-28
Truhe, J. V.
Music
Instruments
84454, 84DIG18, 324 77A, 324 78D, G10H 300, G01R 2302
Patent
active
043512160
ABSTRACT:
A pitch detecting system is provided for an electric guitar having an existing electromagnetic pick-up for strings. For the purposes of pitch detection, all the signals from the guitar strings are sensed by means of an auxiliary pickup comprising a substantially planar substrate of nonconductive material which is mounted upon the existing pickup, below the strings. A plurality of conductive coils on the substrate are each positioned in alignment with a different pole piece of the existing pick-up. The auxiliary pick-up provides a signal representing the sound of each string to a string separator, which transmits to its output only the signals from the auxiliary pick-up which has the fastest rate of build-up of its input signal. The single output signal from the string separator is provided to a pitch detector. In the pitch detector, a reference point in each cycle of the input signal (i.e. the signal from the string separator) is detected by determining when the input signal crosses in a positive direction through a threshold level corresponding to a predetermined proportion of the envelope of the input signal. The time interval between reference points in successive cycles of the input signal is then provided as an estimate of the period of the input signal when the duration is within a predetermined range of the existing estimate. This predetermined range is defined by two thresholds levels, each of which is a predetermined proportion of the existing period estimate. In a second embodiment, a single pitch detector simultaneously processes a plurality of input signals to provide a separate period estimate for each.
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Millman & Halkias, Integrated Electronics Analog and Digital Circuits and Systems, 1972, pp. 583, 585.
Isen Forester W.
Truhe J. V.
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