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    Waveform compressing apparatus, waveform decompressing apparatus, and method of producing compressed data
    12.
    发明公开
    Waveform compressing apparatus, waveform decompressing apparatus, and method of producing compressed data 审中-公开
    波形压缩装置Wellenformdekomprimierungsvorrichtung和用于制造压缩的数据的方法

    公开(公告)号：EP1942490A1

    公开(公告)日：2008-07-09

    申请号：EP08100017.6

    申请日：2008-01-02

    申请人： YAMAHA CORPORATION

    发明人： Okazaki, Masatsugu

    IPC分类号： G10L19/14 ,  G10H7/12

    CPC分类号： G10H7/12 ,  G10H2250/581 ,  G10L19/22

    摘要： In a waveform compressing apparatus, a trial mode selecting portion selects a trial mode having the highest compression rate from a plurality of candidate modes which have not been selected before as a trial mode for generating a residue code. A waveform data compressing portion compresses a given data amount of original waveform data according to the selected trial mode so as to generate the residue code, the data amount being determined in correspondence with the selected trial mode. A waveform data restoring portion generates a restored waveform data from the compressed data using the generated residue code. A determining portion measures an evaluation value of a quantization error contained in the restored waveform data relative to the original waveform data, and determines whether the evaluation value is equal to or smaller than a predetermined allowable value. A mode change instructing portion outputs a mode change instruction for instructing the trial mode selecting portion to select another trial mode when the evaluation value is not smaller than the predetermined allowable value.

    摘要翻译： 在一个波形压缩装置，试用模式选择部选择具有从以前没有选择作为试用模式用于生成剩余码的候选模式的多个压缩率最高的试用模式。 一种波形数据压缩部压缩原始波形数据gemäß的一个给定的数据量，以所选择的试用模式以便产生残余码，对应于开采与所选择的试用模式中的数据量为确定性的。 一种波形数据使用所产生的残余物的代码恢复部分基因率从压缩数据恢复的波形数据。 在含有还原相对于原始波形数据的波形数据中的量化误差的评价值，并确定地雷的部分措施确定性采矿无论评价值比规定的容许值以下的情况下。 A模式变更指示部输出指示试用模式选择部选择另一试用模式当评价值不大于预定的允许值小的模式改变指令。

    WAVEFORM GENERATING DEVICE AND METHOD, AND DECODER
    13.
    发明公开
    WAVEFORM GENERATING DEVICE AND METHOD, AND DECODER 审中-公开
    SIGNALFORMERZEUGUNGSEINRICHTUNG UND VERFAHREN UND DECODER

    公开(公告)号：EP1538740A1

    公开(公告)日：2005-06-08

    申请号：EP03733581.7

    申请日：2003-06-27

    申请人： Sony Corporation

    发明人： KEMMOCHI, Chisato, SONY CORPORATION ,  INOUE, Akira, SONY CORPORATION ,  NISHIGUCHI, Masayuki, SONY CORPORATION

    IPC分类号： H03B28/00 ,  G10L13/00 ,  G10H7/10

    CPC分类号： G10H7/12 ,  G10H7/10 ,  G10H2250/121 ,  G10H2250/225 ,  H03B28/00

    摘要： Amplitude, phase and frequency of a sine wave to be generated are calculated on the basis of feature quantity s1 delivered to feature quantity detecting means (2), and are sent to initialization means (3). The initialization means (3) calculates first two points of the sine wave to send the points thus calculated to oscillator (sine wave generating means) (4) as initial value s4. The oscillator (4) sequentially calculates values of respective sample points of waveform by using recurrence formula in accordance with initial value or values instructed from the initialization means (3) to thereby generate a sine wave signal. Thus, sine wave generation is performed without performing modulo-addressing.

    摘要翻译： 基于发送到特征量检测装置（2）的特征量s1计算要产生的正弦波的幅度，相位和频率，并将其发送到初始化装置（3）。 初始化装置（3）计算正弦波的前两点，将由此计算的点发送到振荡器（正弦波产生装置）（4）作为初始值s4。 振荡器（4）通过使用根据从初始化装置（3）指示的初始值或值的递归公式顺序地计算各波形采样点的值，从而产生正弦波信号。 因此，在不执行模寻址的情况下执行正弦波生成。

    Tone generation system for electronic musical instrument
    14.
    发明公开
    Tone generation system for electronic musical instrument 失效
    音乐会音乐会。

    公开(公告)号：EP0024108A2

    公开(公告)日：1981-02-25

    申请号：EP80302253.2

    申请日：1980-07-03

    申请人： The Wurlitzer Company

    发明人： Niezgoda, Thomas Anthony ,  Oppenheimer, Carl Paul

    IPC分类号： G10H1/057 ,  G10H7/00

    CPC分类号： G10H1/0575 ,  G10H7/12

    摘要： A tone generation system is intended for use with an electronic musical instrument of the type wherein an audible tone is generated electronically in response to actuation of the instrument by a player. The invention generates digital signals capable of defining either the waveshape or the envelope characteristic of a tone for each tone initiated by such player actuation, the amplitude thereof being varied in accordance with the intensity of the player actuation initiating that tone. To define the amplitude, digital electronic circuits (22) are utilized for developing a digital scaling signal corresponding to the intensity of actuation of the instrument by the player. Other digital circuits develop (10,18) a digital waveform segment signals which define portions of a composite waveform, as represented in an orthogonal coordinate system. Further digital circuits (24) arithmetically manipulate these scaling signals and waveform segment signals to give a composite output signal defining the envelope or waveform to be produced.

    摘要翻译： 音调产生系统旨在与电子乐器一起使用，其中响应于玩家对乐器的致动而以电子方式产生可听音。 本发明产生数字信号，其能够定义由这种播放器致动发起的每个音调的波形或包络特征，其幅度根据播放器启动该音调的强度而变化。 为了定义幅度，数字电子电路（22）用于开发与播放器的仪器致动强度对应的数字缩放信号。 其他数字电路开发（10,18）数字波形段信号，其限定复合波形的部分，如在正交坐标系中所表示的。 另外的数字电路（24）以算术方式操纵这些缩放信号和波形段信号，以给出一个复合输出信号，其定义要产生的包络或波形。

    WAVEFORM GENERATING DEVICE AND METHOD, AND DECODER
    15.
    发明公开
    WAVEFORM GENERATING DEVICE AND METHOD, AND DECODER 审中-公开
    波形产生装置和方法以及解码器

    公开(公告)号：EP1538740A4

    公开(公告)日：2006-04-12

    申请号：EP03733581

    申请日：2003-06-27

    申请人： SONY CORP

    发明人： KEMMOCHI CHISATO ,  INOUE AKIRA ,  NISHIGUCHI MASAYUKI

    IPC分类号： G10H7/10 ,  G10H7/12 ,  H03B28/00 ,  G10L13/00

    CPC分类号： G10H7/12 ,  G10H7/10 ,  G10H2250/121 ,  G10H2250/225 ,  H03B28/00

    摘要： The amplitude, phase and frequency of a sine wave to be generated is calculated from a feature s1 delivered to feature measuring means (2) and sent to initial setting means (3). The initial setting means (3) calculates the first two points of the sine wave and sends them as initial values s4 to an oscillator (sine wave generating means) (4). The oscillator (4) sequentially calculates the values of sample points of the waveform by using a recurrence formula according to the initial values given by the initial setting means (3) to generate a since wave signal. Thus without carrying out modulo addressing, a sine wave can be generated.

    NON-LINEAR TONE GENERATOR
    17.
    发明公开
    NON-LINEAR TONE GENERATOR 失效
    非线性音调发生器

    公开(公告)号：EP0906610A1

    公开(公告)日：1999-04-07

    申请号：EP96941317.0

    申请日：1996-11-08

    申请人： Chromatic Research, Inc.

    发明人： WANG, Avery, L.

    IPC分类号： G10H1 ,  G10H7

    CPC分类号： G10H7/02 ,  G10H1/16 ,  G10H7/12 ,  G10H2250/205 ,  G10H2250/561 ,  Y10S84/10

    摘要： A method and apparatus for producing a tone (e.g. for music) without the use of a waveform memory and using a feedback loop. The feedback loop includes a waveform generator which calculates, in real time, a parabolic approximation to a sine wave. The feedback loop includes a delay phase differencer (46) to eliminate hunting. The output waveform from the feedback loop is provided to a sine function generator (74) which approximates a sine value using a third order polynomial, to provide the output tone.

    Musical tone generating apparatus
    18.
    发明公开
    Musical tone generating apparatus 失效
    的乐音产生装置。

    公开(公告)号：EP0548045A2

    公开(公告)日：1993-06-23

    申请号：EP93100418.8

    申请日：1987-04-14

    申请人： YAMAHA CORPORATION

    发明人： Suzuki, Hideo ,  Kudo, Masaki ,  Kurakake, Yasushi

    IPC分类号： G10H7/12 ,  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 data (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.

    Musical tone generating apparatus
    19.
    发明公开
    Musical tone generating apparatus 失效
    Musiktonerzeugungsvorrichtung。

    公开(公告)号：EP0177934A1

    公开(公告)日：1986-04-16

    申请号：EP85112743.1

    申请日：1985-10-08

    申请人： YAMAHA CORPORATION

    发明人： Suzuki, Hideo ,  Kunimoto, Toshifumi

    IPC分类号： G10H7/00

    CPC分类号： G10H7/12 ,  G10H2250/115 ,  G10H2250/601

    摘要： This apparatus is basically constructed by a memory (M) storing difference data (D(n) ) and a data reproduction circuit (200). The difference data is in advance obtained by converting a musical tone signal (F(t) ) to be reproduced to digital sample data (F(n) effecting a linear prediction operation on the digital sample data (F(n) ) to produce prediction data (FY(n) ) and calculating the difference (D(n) ) between the digital sample data (F(n) ) and the prediction data (FY(n) ). The stored difference data (D(n) ) are sequentially read from the memory (M). In the data reproduction circuit (200), the musical tone signal (F(t) ) is reproduced by effecting a reverse operation of the linear prediction operation on the read difference data (D)n) ). In the case where the musical tone signal (F(t) ) is a periodic signal, the efficiency of the data compression is further enhanced by subtracting from each difference data (D(n) ) to be stored in the memory that difference data which was generated one period of the musical tone signal (F(t) ) before the generation of the each difference data (D(n) The efficiency of the data compression is more further enhanced by subtracting from each difference data that difference data which was generated a predetermined number of sampling intervals before the generation of the each difference data.

    摘要翻译： 该装置基本上由存储差分数据（D（n））的存储器（M）和数据再现电路（200）构成。 通过将要再现的乐音信号（F（t））转换为数字样本数据（F（n）），对数字样本数据（F（n））进行线性预测操作，将差分数据提前到 产生预测数据（FY（n））并计算数字样本数据（F（n））与预测数据（FY（n））之间的差（D（n））。 从存储器（M）顺序地读取存储的差分数据（D（n））。 在数据再现电路（200）中，通过对读取差分数据（D）n））进行线性预测操作的反向操作来再现乐音信号（F（t））。 在乐音信号（F（t））是周期信号的情况下，通过从存储在存储器中的每个差分数据（D（n））中减去差分数据，进一步增强数据压缩的效率， 在产生每个差分数据（D（n））之前产生一个音乐乐音信号（F（t））的一个周期。 通过从每个差异数据中减去在生成每个差异数据之前产生预定数量的采样间隔的差异数据来进一步增强数据压缩的效率。