| 摘要 |
A pedal tone generator for an electronic musical instrument, such as an electronic organ, having the capability of automatically producing bass rhythm patterns based on a tonic note, includes a memory for storing a plurality of rhythm patterns which has a plurality of outputs for producing a predetermined pattern sequence for each of the notes of the diatonic musical scale, and a circuit for producing signals indicative of which of the pedal keys, usually thirteen, is operated by the instrumentalist. The pedal key signals are binary encoded to produce a plurality of code words each unique to the tone of one of the keys, and each of the outputs from the memory is also binary encoded to be uniquely represented by one of a corresponding number of code words. Code words representing a depressed key and the note instantaneouly being "played" by the memory are added to produce a coded digital signal representative of the sum in the duodecimal system of counting. For as long as a pedal key is depressed, the selected pattern from the memory causes the variable modulo counter to produce a pattern of musical tones, each being different from but related to the others, the memory determining the pattern played and the depressed pedal key determining the note at which the pattern sequence starts.
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