公开(公告)号：EP0241922A3

公开(公告)日：1989-12-06

申请号：EP87105545.5

申请日：1987-04-14

申请人： YAMAHA CORPORATION

发明人： Suzuki, Hideo c/o Nippon Gakki ,  Kudo, Masaki c/o Nippon Gakki ,  Kurakake, Yasushi c/o Nippon Gakki

IPC分类号： G10H7/00 ,  H03M3/04

CPC分类号： H03M3/042 ,  G10H1/0041 ,  G10H1/26 ,  G10H7/12 ,  G10H2250/595 ,  G10H2250/601

摘要： A musical tone generating apparatus utilizing a data compression method is disclosed. A musical tone is sampled and is converted into waveform data (S(n)). These waveform data (S(n)) are compressed into compressed dta (C(n)) by a linear predictive coding method and further by a differential quantization method. The number of bits of each of the compressed data (C(n)) is thus significantly smaller than that of the waveform data (S(n)). Thereafter, a memory (2) stores the thus compressed data corresponding to an attack portion of the tone and a selected part of a sustain portion of the tone. Hence, it is possible to remarkably reduce the memory storage. When generating a musical tone, the memory (2) reads out the compressed data (C(n)) of the attack portion and thereafter repeatedly reads out the compressed data of the selected part. The read-out compressed data are sequentially decoded into the original digital data. Thus, the whole waveform of the musical tone is reproduced.

公开(公告)号：EP0241922B1

公开(公告)日：1994-12-07

申请号：EP87105545.5

申请日：1987-04-14

申请人： YAMAHA CORPORATION

发明人： Suzuki, Hideo c/o Nippon Gakki ,  Kudo, Masaki c/o Nippon Gakki ,  Kurakake, Yasushi c/o Nippon Gakki

IPC分类号： G10H7/00 ,  H03M3/04

CPC分类号： H03M3/042 ,  G10H1/0041 ,  G10H1/26 ,  G10H7/12 ,  G10H2250/595 ,  G10H2250/601

公开(公告)号：EP0241922A2

公开(公告)日：1987-10-21

申请号：EP87105545.5

申请日：1987-04-14

申请人： YAMAHA CORPORATION

发明人： Suzuki, Hideo c/o Nippon Gakki ,  Kudo, Masaki c/o Nippon Gakki ,  Kurakake, Yasushi c/o Nippon Gakki

IPC分类号： G10H7/00 ,  H03M3/04

CPC分类号： H03M3/042 ,  G10H1/0041 ,  G10H1/26 ,  G10H7/12 ,  G10H2250/595 ,  G10H2250/601

摘要： A musical tone generating apparatus utilizing a data compression method is disclosed. A musical tone is sampled and is converted into waveform data (S(n)). These waveform data (S(n)) are compressed into compressed dta (C(n)) by a linear predictive coding method and further by a differential quantization method. The number of bits of each of the compressed data (C(n)) is thus significantly smaller than that of the waveform data (S(n)). Thereafter, a memory (2) stores the thus compressed data corresponding to an attack portion of the tone and a selected part of a sustain portion of the tone. Hence, it is possible to remarkably reduce the memory storage. When generating a musical tone, the memory (2) reads out the compressed data (C(n)) of the attack portion and thereafter repeatedly reads out the compressed data of the selected part. The read-out compressed data are sequentially decoded into the original digital data. Thus, the whole waveform of the musical tone is reproduced.

摘要翻译： 公开了一种利用数据压缩方法的乐音产生装置。 对乐音进行采样并转换为波形数据（S（n））。 这些波形数据（S（n））通过线性预测编码方式进一步压缩为压缩dta（C（n）），并进一步通过差分量化方法。 因此，压缩数据（C（n））中的每一个的比特数明显小于波形数据（S（n））的比特数。 此后，存储器（2）存储对应于音调的攻击部分的这样的压缩数据和音调的维持部分的选定部分。 因此，可以显着地减少存储器存储。 当产生乐音时，存储器（2）读出攻击部分的压缩数据（C（n）），然后重复地读出所选择的部分的压缩数据。 读出的压缩数据被顺序地解码成原始的数字数据。 因此，音乐的整个波形被再现。