Music – Instruments – Electrical musical tone generation
Patent
1997-10-20
1998-12-08
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84604, 84621, 84659, 84DIG9, G10H 112, G10H 700
Patent
active
058473041
ABSTRACT:
The PC audio circuit described interfaces with and provides audio enhancement to a host personal computer of the type including a central processor, system memory and a system bus. The PC audio circuit includes a digital signal processor (DSP) for processing wavetable data and generating digital audio signals for a plurality of voices. The wavetable data is stored in the host computer's system memory and transferred in portions, as needed by the DSP, to a smaller, low-cost cache memory included with the PC audio circuit. The DSP processes several frames of data samples for an active voice before processing another voice. Processing in this manner alleviates concerns about the percentage use of system bus bandwidth and the maximum allowable system bus latency. These concerns are further alleviated by deriving frequency compensated wavetable data and storing it in system memory to be retrieved by the DSP for generating digital audio signals having high frequency ratios. Digital audio signals generated for each active voice are accumulated in cache memory. When the digital audio signals for all active voices have been accumulated, the accumulated data is transmitted from the cache memory to an external digital-to-analog converter. Since wavetable data is stored in system memory, the cache memory is smaller and less expensive than the local memory in prior art PC audio circuits. Thus, the described PC audio circuit has a lower overall cost.
REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 4133242 (1979-01-01), Nagai et al.
patent: 4201105 (1980-05-01), Alles
patent: 4201109 (1980-05-01), Kitagawa
patent: 4344347 (1982-08-01), Faulkner
patent: 4471681 (1984-09-01), Nishimoto
patent: 4472993 (1984-09-01), Futamase et al.
patent: 4506579 (1985-03-01), Rossum
patent: 4508001 (1985-04-01), Suzuki
patent: 4524668 (1985-06-01), Tomisawa et al.
patent: 4539885 (1985-09-01), Ezawa
patent: 4569268 (1986-02-01), Futamase et al.
patent: 4573389 (1986-03-01), Suzuki
patent: 4622877 (1986-11-01), Strong
patent: 4649783 (1987-03-01), Strong et al.
patent: 4719833 (1988-01-01), Katoh et al.
patent: 4731851 (1988-03-01), Christopher
patent: 4843938 (1989-07-01), Hideo
patent: 4916996 (1990-04-01), Suzuki et al.
patent: 4947723 (1990-08-01), Kawashima et al.
patent: 4953437 (1990-09-01), Starkey
patent: 4998281 (1991-03-01), Sakata
patent: 5111727 (1992-05-01), Rossum
patent: 5144676 (1992-09-01), Rossum
patent: 5166464 (1992-11-01), Sakata et al.
patent: 5187314 (1993-02-01), Kunimoto et al.
patent: 5194681 (1993-03-01), Kudo
patent: 5218710 (1993-06-01), Yamaki et al.
patent: 5243124 (1993-09-01), Kondratiuk et al.
patent: 5300724 (1994-04-01), Medovich
patent: 5342990 (1994-08-01), Rossum
patent: 5393926 (1995-02-01), Johnson
patent: 5406022 (1995-04-01), Kobayashi
patent: 5418321 (1995-05-01), Keller et al.
patent: 5440740 (1995-08-01), Chen et al.
patent: 5442127 (1995-08-01), Wachi et al.
OmniWave.TM. Multimedia Audio, by Samsung Semiconductor, Advance Information, KS0161, pp. 1-8 (Rev. A, Nov. 1994).
Digital Oscillator Chip, Integrated Circuit Systems, Inc., ICS 1261 (DOC1), pp. 1-12 (Date not available).
Integrated Circuit Systems, Inc., Digital Sound Generator (DOC II), ICS1399, Package of Technical Information (Date not available).
Digital Sound Generator (DOC II), ICS 1399, Integrated Circuit Systems, Inc., pp. 1-10 (Date not available).
Digital Sound Generator (DOC II), ICS 1399, Integrated Circuit Systems, Inc., pp. 21-42 (Date not available).
ES 5506 "OTTO", Ensoniq Soundscape.TM. WaveTable Synthesizer, Rev. 2.1, pp. 1-48 (Date not available).
Preliminary specification, "Stereo continuous calibration DAC, TDA1545A," Phillips Semiconductors, pp. 4-212 to 4-229 (Mar. 1993).
Preliminary Product Information, "Advanced Music Synthesizer, CS9203," Crystal Semiconductor Corp., DS117PP1, pp. 1-18 (Aug. 1993).
Preliminary Product Information, "Programmable Music Processor, CS8905," Crystal Semiconductor Corp., DS116PP1, pp. 1-19 (Aug. 1993).
Preliminary Product Information, "CDBGMR4 Music Synthesis Eval. Board," Crystal Semiconductor Corp., DS127PP1, pp. 1-24 and schematics (Aug. 1993).
Application Note, "Wave Table MIDI Synthesizer Solutions, CS8905 and CS9203," by Jim Heckroth, Crystal Semiconductor Corp., AN26REV1, pp. 1-7 (Aug. 1993).
Application Note, "A Tutorial on MIDI and Music Synthesis, Music Synthesis," by Jim Heckroth, Crystal Semiconductor Corp., AN27REV1, pp. 1-6 (Aug. 1993).
"JAZZ16.TM. CHIPSET," Media Vision, Inc., pp. 1-52, 1-22, 1-14, schematics, bill of materials, and p. 23 (Date not available).
Documentation regarding AVS Group NXPR016 Chipset (Date not available).
"OPL3, YMF262, FM Operator Type L3," Yamaha LSI, YMF262 Application Manual, Catalog No. LSI-6MF2622, pp. 1-31 (1992.4).
"YMZ263, Multimedia Audio & Game Interface Controller (MMA)," Yamaha LSI, Rev. Jul. 1, 1992, pp. 1-33.
"YMF262, FM Operator Type L3 (OPL3)," Yamaha LSI, Catalog No. LSI-4MF2622, pp. 1-19 (1991.10).
Preliminary, "YMF278-F (OPL4), 4 Operator FM and WAVE Synthesis Chip," Yamaha LSI, Yamaha Corp., Catalog No. LS1278F, Version 1.01 (Feb. 1, 1993), pp. 1-31.
"SC18000/SC18005 Multimedia System Controller," Sierra Semiconductor, Rev. 0.92, pp. 1-23 (Date not available).
"SC18024 ARIA.TM. Sound Processor," Sierra Semiconductor, Rev. 1.0, pp. 1-15 (Date not available).
"SC18050 Aria Basic Sound ROM," Sierra Semiconductor, Rev. 0.91, pp. 1-3 (Date not available).
"SC18051 1/2 Megabyte Sound ROM," Sierra Semiconductor, Rev. 1.0, pp. 1-3 (Date not available).
"SC18052 1 Megabyte Sound ROM," Sierra Semiconductor, Rev. 1.0, pp. 1-3 (Date not available).
"Musical Applications of Microprocessors," by Hal Chamberlin, Hayden Book Company, Second Edition (1985), Chapters 1, 2, 4, 13, 14, 17 and 19-21.
U.S. Patent Application Serial No. 072,838, entitled "Wave Table Synthesizer," by Travers, et al.
U.S. Patent application serial No. 08/334,461, entitled "Digital Signal Processor Architecture for Wavetable Audio Synthesizer," by Norris, et al.
John Snell, "Design of a Digital Oscillator Which Will Generate Up to 256 Low Distortion Sine Waves in Real Time," Apr. 1977, pp. 4-25.
Adams Michael P.
Advanced Micro Devices , Inc.
Fletcher Marlon T.
Shoop Jr. William M.
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