Pat.#3878749:		Walsh function tone generator and system
INVENTORS:		Woron; Robert P., Southampton, PA
ASSIGNEES:		Allen Organ Company, Macungie, PA
ISSUED:		Apr. 22, 1975
FILED:		Dec. 12, 1972
ABSTRACT: A Walsh function tone generator uses a summing means to sum a plurality of digital Walsh function signals to produce a tone output. The Walsh function generator may be comprised of a clock circuit, a plurality of frequency dividers for dividing the output of the clock circuit and a plurality of exclusive-OR gates for generating the various orders of the Walsh function signals. The summing means may include means for weighting the various orders of the Walsh function signals, such as weighting resistors. The Walsh function tone generator as used in an electronic musical instrument may be provided with bilateral electronic switches between the output of the Walsh function generator and the input of the summing means. The electronic switches may be used in conjunction with an attack and decay generator to provide an output wave form having the desired attack and decay characteristics. The purpose of the above abstract is to provide a non-legal technical statement of the disclosure of the contents of the instant patent application and thus serve as a searching-scanning tool for scientists, engineers and researchers. Accordingly, this abstract is not intended to be used in understanding or otherwise comprehending the principles of the present invention hereinafter described in detail, nor is it intended to be used in interpreting or in any way limiting the scope or fair meaning of the claims appended hereto.