Patent ID: 9040800
Filing Date: 2015-05-26
Classification: G10H

Abstract:
1. A musical tone signal generating apparatus comprising: a waveform memory in which waveform data formed of a plurality of compressed data sets obtained by sampling a plurality of musical tones having different tone pitches and compressing sample values in relation to differences between the sample values and their respective immediately preceding sample values is stored for the respective tone pitches; computing circuitry for reading compressed data from the waveform memory within an assigned computing period of time in response to instructions to generate a musical tone, decoding the compressed data, and outputting data indicative of a sample value of the decoded compressed data; computing period determining processing unit for inputting tone pitch information indicative of a tone pitch of the musical tone which is to be generated, identifying waveform data which is among the plurality of waveform data stored in the waveform memory and is to be read by the computing circuitry, and determining the length of the assigned computing period of time in accordance with the identified waveform data; and interpolating circuitry for interpolating the data indicative of the sample value output by the computing circuitry in accordance with a ratio of the tone pitch of the musical tone which is to be generated to an original tone pitch of a musical tone represented by the waveform data identified by the computing period determining processing unit, and outputting the interpolated result.