| 摘要 |
A programmable machine for aiding in the development of note and pitch recognition employs encoded exercise cards carrying corresponding note indicia thereon and means for reading the cards to establish corresponding tuned circuits capable of passing only the frequency of a selected note for operating a mechanism to advance the card reading means. A circuit for indicating the exercise completion and a timer for permitting operation of the exercise completion circuit in response to favorable performance by the student within a prescribed time period are employed to produce a record of the student's achievement. This apparatus may be extended by dual coding of the cards to selectively establish oscillator circuit configurations in apparatus for tuning instruments and advantageously utilized in combination therewith to provide the student with an indication of whether he is playing a note sharp or flat.
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