US005416264A
[11] Patent Number: 5,416,264 [45] Date of Patent: May 16, 1995
[54] WAVEFORM-FORMING DEVICE HAVING MEMORY STORING NON-COMPRESSED/COMPRESSED WAVEFORM SAMPLES
[75] Inventors: Hiroyuki Toda; Tetsuji Ichiki, both of Hamamatsu, Japan
[73] Assignee: Yamaha Corporation, Japan
[21] Appl. No.: 97,163
[22] Filed: Jul. 23,1993
[30] Foreign Application Priority Data
Jul. 27, 1992 [JP] Japan 4-219751
Dec. 26, 1992 [JP] Japan 4-359637
[51] Int. C1.6 G10H 1/057; G10H 7/04
[52] U.S. CI 84/603; 84/605;
84/607
[58] Field of Search 84/602-607,
84/622-627
[56] References Cited
U.S. PATENT DOCUMENTS
4,876,935 10/1989 Kitagawa 84/627
4,916,996 4/1990 Suzuki et al. .
5,252,773 10/1993 Kozuki et al 84/607
5,290,965 3/1994 Yoshida et al 84/605
5,329,062 7/1994 Kaneko 84/603
5,347,087 9/1994 Kozuki 84/605
FOREIGN PATENT DOCUMENTS
0273447 12/1987 European Pat. Off. .
Primary Examiner—Vit W. Miska
Attorney, Agent, or Firm—Graham & James
[57] ABSTRACT
A waveform-forming device has a waveform memory storing a plurality of blocks of waveform samples representative of a waveform of a musical tone. Each block is formed of at least one non-compressed waveform sample and a plurality of compressed waveform samples. A pitch of a musical tone to formed is taken in. The waveform samples are read out block by block from the waveform memory, based on the pitch taken in. The compressed waveform samples contained in each block are converted into non-compressed waveform samples. The waveform of the musical tone is formed from the at least one non-compressed waveform sample of each block and the non-compressed waveform samples obtained by the conversion.
10 Claims, 17 Drawing Sheets
