Music – Instruments – Electrical musical tone generation
Patent
1996-04-04
1997-12-02
Shoop, Jr., William M.
Music
Instruments
Electrical musical tone generation
84622, 84DIG9, G10H 700, G10H 710
Patent
active
056939019
ABSTRACT:
According to a first invention, provided is an electronic musical instrument, which decodes and reads waveforms that are compressed by the DPCM method or the ADPCM method, that stores a prediction filter coefficient that is consonant with each waveform and reproduces musical tones by using the prediction filter coefficient. In the first invention, a waveform that is stored in the electronic musical instrument is stored together with a prediction filter coefficient that is used when the waveform was prepared, and the optimal prediction filter coefficient is employed for each waveform to reproduce a waveform.
According to a second invention, provided is an electronic musical instrument, which decodes waveforms that are compressed by the DPCM method or the ADPCM method and repeatedly reads the decoded data, that can repetitiously read waveform data at the loop top without requiring a device for setting a decoding device. In the second embodiment, a waveform that is to be repeatedly read is coded by a prediction filter, for which a prediction filter coefficient is set so that the result of decoding at the repeated reading head portion matches each time.
REFERENCES:
patent: 4916996 (1990-04-01), Suzuki et al.
patent: 5336844 (1994-08-01), Yamauchi et al.
Fletcher Marlon
Kabushiki Kaisha Kawai Gakki Seisakusho
Shoop Jr. William M.
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