Conversion from note-based audio format to PCM-based audio...

Details Conversion from note-based audio format to PCM-based audio... Conversion from note-based audio format to PCM-based audio...

2008-11-13

2010-12-21

Ferguson, Keith T (Department: 2618)

Telecommunications

Carrier wave repeater or relay system

Frequency or phase modulation

C455S039000, C455S550100, C455S567000, C455S412100, C455S412200

Reexamination Certificate

active

07856205

ABSTRACT:
A system and method for converting a polyphonic note-based audio object to a Pulse Code Modulated (PCM) audio format is disclosed. An electronic communication device includes a memory containing a polyphonic note-based audio object containing at least two notes which overlap in at least some time interval and a lookup table containing trigonometric function evaluations. The polyphonic note-based audio object contains note frequency information. The polyphonic note-based audio object is converted to a PCM stream by generating PCM code words for each sample point in the PCM stream based upon the polyphonic note frequency information. The PCM code words are determined based upon selection of one or more of the trigonometric function evaluations within the look-up table. A speaker outputs audio based upon the PCM formatted stream.

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Ringtone Creator as found at http://www.ringtonecreator.info/doc-gui/01-intro.html.
comp.graphics.algorithms—sine/cosine look up tables Options as found at http://groups.google.ca/group/comp.graphics.algorithms/browse—thread/thread/7067e0b7d7c04c16/f246ed656fbab5d0?g=sine+lookup+table+fpu&mum=1&hl=en#f246ed656fbab5d0sinelookuptablefpu.

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