Boots – shoes – and leggings
Patent
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.
Dicker Samuel C.
Olson Kipley J.
Reekes James D.
Apple Computer Inc.
Ramirez Ellis B.
Workman Helene Plotka
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