Music – Instruments – Electrical musical tone generation
Patent
1994-07-07
1995-04-04
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84624, 84661, 84DIG9, 84DIG26, G10H 114
Patent
active
054039690
ABSTRACT:
In a tone signal synthesizer for synthesizing a tone signal by supplying a driving signal, into a closed loop circuit including a delay circuit and a filter, a filter coefficient which controls the characteristic of the filter is changed while a musical tone is generated. For example, a set of filter coefficients are provided at the time of key-on and are switched to another set of filter coefficients when a predetermined time is passed after the time of key-on. The set of filter coefficients are switched to a further set of filter coefficients at the time of key-off and then are switched to a still further set of filter coefficients when a predetermined time is passed after the time of key-off. It is possible to generate a musical tone which changes more complexly on the basis of the change of the filter characteristic, with the passage of time.
REFERENCES:
patent: Re31004 (1982-08-01), Niimi
patent: 4658690 (1987-04-01), Aitken et al.
patent: 4862784 (1989-09-01), Kimpara
patent: 4907484 (1990-03-01), Suzuki et al.
patent: 4909120 (1990-03-01), Horiki et al.
patent: 4984276 (1991-01-01), Smith
patent: 5157218 (1992-10-01), Kunimoto et al.
Shoop Jr. William M.
Sircus Brian
Yamaha Corporation
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