Digital filter device for tone control

Details Digital filter device for tone control Digital filter device for tone control

1993-10-14

1995-01-10

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84DIG9, G10H 112

Patent

active

053809505

ABSTRACT:
A filter operation unit includes an operation circuit for receiving a digital tone signal and an operation parameter and digitally operating the tone signal with the operation parameter, a memory circuit for storing result of the operation and a connection switching circuit for establishing a filter operation algorithm by switching the mode of connection of the operation circuit and the memory circuit in response to a control signal. A control signal corresponding to a desired filter operation algorithm and an operation parameter for realizing a desired filter characteristic in the filter operation algorithm are generated by a control circuit and supplied to the filter operation unit. By switching the function of the filter operation unit, a filter characteristic corresponding to a desired filter operation algorithm can be selectively realized by employing one filter operation unit. It is also possible to realize plural basic filter operation algorithms on a time shared basis and control a tone signal with a filter characteristic obtained by combining these basic filter operation algorithms.

REFERENCES:
patent: 4215617 (1980-08-01), Moorer
patent: 4249447 (1981-02-01), Tomisawa
patent: 4265158 (1981-05-01), Takahashi
patent: 4343218 (1982-08-01), Futamase
patent: 4554857 (1985-11-01), Nishimoto
patent: 4736333 (1988-04-01), Mead et al.
patent: 4736663 (1988-04-01), Wawrzynck et al.
patent: 4766561 (1988-08-01), Thompson et al.
patent: 4840099 (1989-06-01), Kitagawa
patent: 5010799 (1991-04-01), Tanaka et al.
patent: 5033352 (1991-07-01), Kellogg et al.
patent: 5040448 (1991-08-01), Matsubara et al.

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