Sound field control apparatus

Details Sound field control apparatus Sound field control apparatus

1991-01-24

1991-12-17

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

381 63, 84630, 84DIG26, H03G 300

Patent

active

050739425

ABSTRACT:
A sound field switcher inputs an output sound field signal from a sound field producer. The inputted sound field signal is delayed sequentially by plural delayers, after which they are multiplied by coefficients by plural multipliers, and the multiplied results are all added by an adder. Coefficients stored in an area of a memory indicated by a coefficient counter are read out and set to the plural multipliers. The sound field switcher carries out control of the timing for switching the sound field signal produced by the sound field producer and the timing for the coefficient counter to commence counting. Assuming the time required for switching the sound field to be N sampling periods, in case of carrying out a sound field switching from a sound field A to a sound field B, a sound field switching controller issues an order to the coefficient counter so as to count up one by one from 0 to N, and on each count the coefficients stored in an area of the coefficient memory is set to the multipliers. When the count value of the coefficient counter comes to (N/2) or nearest to (N/2), the sound field switching controller issues an order to the sound field producer to output the sound field signal of the sound field B. When the count value of the coefficient counter comes to N, the switching from the sound field A to the sound field B is completed.

REFERENCES:
patent: 4628789 (1986-12-01), Fujimori
patent: 4649564 (1987-03-01), Barnett
patent: 4731848 (1988-03-01), Kendall et al.
patent: 4937875 (1990-06-01), Hayashi

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