Title:
SYSTEM FOR PROCESSING FREQUENCY OF KEYING OF KEYBOARD CIRCUIT
Document Type and Number:
Japanese Patent JPS5850591
Kind Code:
A
Abstract:
Key switches of a keyboard circuit are scanned by a counter which starts at a lower or upper limit value that is preset in the counter by a signal which also reverses the counting direction data from the counter, is provided to a first circuit having preset therein the number of preferential low-pitched or high-pitched tones to be produced and a second circuit having preset therein a maximal number of tones to be produced. In the case where the number of preferential low-pitched tones is preset in the first circuit, and when the number of tones based on the data from the counter reaches the preset number, the direction of counting of the counter is reversed by the signal to cause the counter count down starting with the preset upper limit value. In the case where the number of preferential high-pitched tone productions is preset in the first circuit, and when reaching the preset number, the direction of counting of the counter is inverted to cause it to count up from the preset lower limit value. When the number of simultaneous key depressions exceeds the maximal number of tones allowed by the second circuit, the processing causes middle-pitched tones to be eliminated.
Inventors:
KONDOU NOBUAKI
Application Number:
JP15021481A
Publication Date:
March 25, 1983
Filing Date:
September 22, 1981
Export Citation:
Assignee:
KAWAI MUSICAL INSTR MFG CO
International Classes:
G10H1/18; G10H1/22; G10H1/28; (IPC1-7): G10H1/18
Attorney, Agent or Firm:
Yoshishige Tasaka