Method and apparatus for mixing multiple channels of sampled dig

Details Method and apparatus for mixing multiple channels of sampled dig Method and apparatus for mixing multiple channels of sampled dig

1994-05-10

1996-12-03

Ramirez, Ellis B.

Boots, shoes, and leggings

G06F 1700

Patent

active

055814808

ABSTRACT:
Briefly, a method and apparatus for mixing a plurality of channels of digital audio samples using a non-linear clipping function which has a variable scaling factor is disclosed. The non-linear curving function is capable of being graphically represented by a curve which is sloped at the edges before reaching the maximum values. In a first embodiment, the non-linear clipping function is applied to the samples and values are calculated in real-time. Preferably, inputs to the non-linear clipping function are modified depending upon any significant trends, e.g. increasing or decreasing, in the sums of samples over time. In a second embodiment, to reduce processor overhead, prior to real time application of the non-linear clipping function, the calculations are performed and a lookup table is generated. This lookup table is then used during real time to apply the clipping function to the input data so that the non-linear function is not recalculated whenever multiple channels are mixed. Lookup tables can be used in combination to apply the non-linear clipping function to a number of channels for which there is not a defined a look up table.

REFERENCES:
patent: 4704726 (1987-11-01), Gibson
patent: 4924121 (1990-05-01), Ohno
Black; "Computer Networks" Prentice Hall (N.Y.) 1987; pp. 254-257.
"The Sound Manager", Inside MacIntosh, vol. VI, Chapter 22, Jun. 1991, pp. 22-1 thru 22-114.
Jim Reekes, "Somewhere In Quicktime", Develop, Issue 16, Dec. 1993, pp. 34-38.
Jim Reekes & Tom Thompson, "MacIntosh Sound Revealed", Byte, Jul. 1991, pp. 249-250, 252, 254, 256, 258, 260, 262.

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