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AssigneeAdvanced Micro Devices, Inc.
InventorDale E. Gulick
Estimating the term…
A computer system and method for performing wavetable music synthesis which uses system memory to store wavetable data and minimizes audio infidelity introduced by wavetable data access latency. The system comprises a system memory which stores wavetable data, an I/O bus coupled to the system memory, and a system audio device. The system audio device comprises an I/O bus interface coupled to the I/O bus, a synthesizer which generates sounds in response to the wavetable data, a plurality of buffers coupled to the I/O bus interface and to the synthesizer for buffering the wavetable data from the system memory, and a buffer manager coupled to the I/O bus interface, the synthesizer, and the plurality of buffers. The buffer manager manages transfers of the wavetable data from the system memory to the buffers and from the buffers to the synthesizer. The synthesizer generates a request to the buffer manager for wavetable data samples. If the samples do not reside in the buffers and the buffer manager is unable to retrieve the samples from the system memory within a desired frame time, the synthesizer outputs surrogate values until the samples become available. The synthesizer calculates the surrogate values so as to avoid producing audible artifacts in the sound generated by the synthesizer. The synthesizer calculates the surrogate values according to one of two methods. The first method is to simply output the last valid value calculated by the synthesizer. The second method is to ramp the value toward zero at a rate defined as the fastest rate which does not produce audible artifacts.
A computer system for performing wavetable music synthesis comprising:
A method of performing wavetable music synthesis in a system comprising a system memory storing wavetable data samples, an I/O bus, and a system audio device, said system audio device having an I/O bus interface coupled to said I/O bus, and a synthesizer coupled to said I/O bus interface, comprising:
A computer system for performing wavetable music synthesis comprising:
A method of performing wavetable music synthesis in a system comprising a system memory storing wavetable data samples, an I/O bus, and a system audio device, said system audio device having an I/O bus interface coupled to said I/O bus, a synthesizer, a plurality of buffers coupled to said I/O bus interface and said synthesizer, and a buffer manager coupled to said I/O bus interface, said synthesizer, and said plurality of buffers, comprising:
Dependencies are inferred from the claim text.