Touch response providing apparatus
AssigneeCasio Computer Co., Ltd.
InventorHideaki Ishida
Life of this patent
Estimating the term…
Abstract
First to third switch contact pairs are provided for each of the performance keys of an electronic keyboard musical instrument such that they are successively closed in an interlocked relation to the operation of the associated key. A first time interval from the closure of the first switch contact pair till the closure of the second switch contact pair and a second time interval from the closure of the second switch contact pair till the closure of the third switch contact pair are counted in a CPU, and their ratio is obtained therein. The tone color of the output musical signal is controlled according to the value of this ratio, and the volume of the musical signal is controlled according to the length of the second time interval.
Claims16
A touch response providing apparatus for changing the characteristics of output musical sound from an electronic keyboard musical instrument, having a plurality of performance keys, according to the state of operation of a performance key being operated, comprising:
- a set of at least three switches coupled to each of said performance keys of the electronic keyboard musical instrument and which are switched in a predetermined order at the time of the operation of said each key;
- counting means coupled to said set of at least three switches for each of said keys for counting the periods required for the switching of the individual switches corresponding to an operated key at the time of the key operation, and for providing a count output corresponding to the length of the counted periods;
- and
- control means coupled to said counting means for controlling at least two characteristics of the output musical sound produced by the instrument in correspondence with the key operation as a function of the count output of said counting means.
In an electronic keyboard musical instrument having a plurality of performance keys, a touch response providing apparatus comprising:
- a key matrix circuit having a set of at least three switches associated with each of the performance keys;
- detecting means for scanning said key matrix circuit and for detecting the "on" and "off" states of said pluarlity of performance keys through said scanning of said key matrix circuit;
- and
- control means coupled to said detecting means for controlling at least two characteristics of output musical sound produced in response to the operation of a performance key according to the result of detection by said detecting means.
Dependencies are inferred from the claim text.