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US 12,272,342 B2Granted
Filter effect imparting device, electronic musical instrument, and control method for electronic musical instrument
AssigneeCasio Computer Co., Ltd.
InventorMasuo Yokota
Life of this patent
Estimating the term…
Abstract
A filter effect imparting device includes a characteristic-variable filter that has a variable filter characteristic corresponding to a coefficient group composed of a plurality of filter coefficients, and a control circuit that changes the coefficient group from a first coefficient group that is set as a start point to a second coefficient group that is set as an end point. The control circuit retains the coefficient group during the change and, in newly setting a third coefficient group as the end point, the control circuit sets the retained coefficient group as the start point.
Claims13
A filter effect imparting device comprising:
- a characteristic c-variable filter that has a variable filter characteristic corresponding to a coefficient group composed of a plurality of filter coefficients;
- and
- a control circuit that changes the coefficient group from a first coefficient group that is set as a start point to a second coefficient group that is set as an end point,
- wherein the control circuit retains the coefficient group during the change and, in newly setting a third coefficient group as the end point, the control circuit sets the retained coefficient group as the start point,
- wherein in accordance with an envelope signal that specifies a ratio indicating a closeness of a new coefficient group to be generated to a coefficient group set as the start point and to a coefficient group set as the end point, the control circuit performs interpolation processing between the coefficient group set as the start point and the coefficient group set as the end point to generate the new coefficient group such that the ratio indicated by the envelope signal is satisfied.
2 more elements
An electronic musical instrument comprising:
- a performance operation receiver with which a user performs a performance operation;
- a musical sound generator that generates a musical sound corresponding to the performance operation on the performance operation receiver;
- a characteristic-variable filter that has a variable filter characteristic corresponding to a coefficient group composed of a plurality of filter coefficients;
- a control circuit that changes the coefficient group from a first coefficient group that is set as a start point to a second coefficient group that is set as an end point;
- and
- an effect imparter that performs, using the characteristic-variable filter, filtering on the musical sound generated by the musical sound generator,
- wherein the control circuit retains the coefficient group during the change and, in newly setting a third coefficient group as the end point, the control circuit sets the retained coefficient group as the start point, and
- wherein in accordance with an envelope signal that specifies a ratio indicating a closeness of a new coefficient group to be generated to a coefficient group set as the start point and to a coefficient group set as the end point, the control circuit performs interpolation processing between the coefficient group set as the start point and the coefficient group set as the end point to generate the new coefficient group such that the ratio indicated by the envelope signal is satisfied.
5 more elements
A control method for an electric musical instrument that includes:
- a performance operation receiver with which a user performs a performance operation;
- a musical sound generator that generates a musical sound corresponding to the performance operation on the performance operation receiver;
- and a characteristic-variable filter that has a variable filter characteristic corresponding to a coefficient group composed of a plurality of filter coefficients, the method comprising causing the electronic musical instrument to perform:
- controlling comprising changing the coefficient group from a first coefficient group that is set as a start point to a second coefficient group that is set as an end point;
- and
- effect imparting comprising performing, using the characteristic-variable filter, filtering on the musical sound generated by the musical sound generator,
- wherein the controlling comprises retaining the coefficient group during the change and, in newly setting a third coefficient group as the end point, sets setting the retained coefficient group as the start point, and
- wherein the controlling comprises, in accordance with an envelope signal that specifies a ratio indicating a closeness of a new coefficient group to be generated to a coefficient group set as the start point and to a coefficient group set as the end point, performing interpolation processing between the coefficient group set as the start point and the coefficient group set as the end point to generate the new coefficient group such that the ratio indicated by the envelope signal is satisfied.
5 more elements
Dependencies are inferred from the claim text.