Michael W Mcgowan

US Patent:

43559840, Oct 26, 1982

Filed:

Mar 25, 1980

Appl. No.:

6/133850

Inventors:

William H. Slavik - Palos Hills IL
William P. Carlson - Chicago IL
Michael J. McGowan - Downers Grove IL

Assignee:

Nuvatec, Inc. - Lombard IL

International Classification:

G09B 702
G09B 706

US Classification:

434335

Abstract:

A teaching device includes a reading station provided with six on-off switches for automatically sensing a text key encoded as a pattern of punched holes in a text book. The teaching device automatically generates an answer key from the text key by means of a pseudo-random number generator which is run using the text key as a seed. The text book includes a number of multiple choice questions in which the correct answer corresponds to the answer designated in the answer key.

US Patent:

43544185, Oct 19, 1982

Filed:

Aug 25, 1980

Appl. No.:

6/180860

Inventors:

John V. Moravec - Willow Springs IL
William P. Carlson - Hanover Park IL
Michael J. McGowan - Lombard IL

Assignee:

Nuvatec, Inc. - Lombard IL

International Classification:

G10G 702

US Classification:

84454

Abstract:

An automatic note analyzer is disclosed which automatically generates and displays a note signal indicative of the musical note corresponding to an input signal. The disclosed analyzer operates to measure the period of the input signal on a regular basis. According to one aspect of the invention, the measured period is compared with a predetermined window representative of the expected value of the measured period. Measured periods which do not fall within the predetermined window are rejected. According to a second feature, measured signals representative of the period of the input signal are averaged in order to increase the stability of the analyzer. The disclosed analyzer operates in two modes: an absolute mode, and a transposer mode. In the absolute mode the displayed note value is determined with reference to an absolute pitch. In the transposer mode, the displayed note value is determined with reference to a relative pitch which can be readily adjusted as needed.