System and methods for memory-constrained sound synthesis using harmonic coding
    1.
    发明申请
    System and methods for memory-constrained sound synthesis using harmonic coding 有权
    使用谐波编码的存储器约束声音合成的系统和方法

    公开(公告)号:US20060075880A1

    公开(公告)日:2006-04-13

    申请号:US10964385

    申请日:2004-10-13

    IPC分类号: G10H7/00

    摘要: Systems (100 or 300) and methods (400 or 500) are provided for selecting a post-compression waveform from a post-compression waveform table (106) and supplying it to a synthesis engine (108). The post-compression waveform is based upon a set of post-compression coefficients determined by generating a frequency-domain representation of a periodic signal, the representation including at least one pre-compression frequency-domain sample (204), and performing a threshold-based compression of the pre-compression frequency-domain samples. Systems and methods also include indexing and storing (502) post-compression coefficients in a post-compression coefficient table (102), generating (506) a post-compression waveform based upon the set of post-compression coefficients, and placing (508) the post-compression waveform in the table prior to the selecting (510). The system and method also include performing (504) a read-ahead operation on a sound file before selecting the post-compression waveform, the read-ahead operation indicating the post-compression waveform to be selected and supplied to the synthesis engine.

    摘要翻译: 系统(100或300)和方法(400或500)用于从后压缩波形表(106)中选择后压缩波形并将其提供给合成引擎(108)。 后压缩波形基于通过生成周期信号的频域表示而确定的一组后压缩系数,所述表示包括至少一个预压缩频域样本(204),并且执行阈值 - 预压缩频域采样的基于压缩的压缩。 系统和方法还包括在后压缩系数表(102)中索引和存储后压缩系数(502),基于所述一组后压缩系数产生(506)后压缩波形,以及将(508) 在选择之前的表中的后压缩波形(510)。 该系统和方法还包括在选择后压缩波形之前对声音文件执行(504)预读操作,所述预读操作指示要被选择并提供给合成引擎的后压缩波形。

    MIDI scalable polyphony based on instrument priority and sound quality
    2.
    发明申请
    MIDI scalable polyphony based on instrument priority and sound quality 有权
    基于乐器优先级和声音质量的MIDI可伸缩复音

    公开(公告)号:US20050257669A1

    公开(公告)日:2005-11-24

    申请号:US10849628

    申请日:2004-05-19

    摘要: A method of scaling polyphony can include identifying music data to be played (415), wherein the music data indicates instruments to be used and each instrument has an assigned priority. A measure of polyphony needed to play the music data can be compared with polyphony of a sound generating device (425). If the measure of polyphony exceeds the polyphony of the sound generating device, the music data can be played without using one or more instruments indicated by the music data according to the assigned priorities (440, 460).

    摘要翻译: 缩放复音的方法可以包括识别要播放的音乐数据(415),其中音乐数据指示要使用的乐器,并且每个乐器具有分配的优先级。 演奏音乐数据所需的复音度量可以与发声装置的复音进行比较(425)。 如果复音的度量超过声音产生装置的复音,则可以根据分配的优先级(440,460)不使用由音乐数据指示的一个或多个乐器来播放音乐数据。

    Method and apparatus for generating percussive sounds in embedded devices
    3.
    发明授权
    Method and apparatus for generating percussive sounds in embedded devices 有权
    在嵌入式设备中产生冲击声的方法和装置

    公开(公告)号:US06426456B1

    公开(公告)日:2002-07-30

    申请号:US10012273

    申请日:2001-10-26

    IPC分类号: G10H1057

    摘要: A percussive sound contains both harmonic and non-harmonic frequency spectral content. To reproduce a particular percussive sound, such as the sound of a drum or cymbal or hand clap, for example, the harmonic and non-harmonic content are determined empirically. Also, and tendency of the harmonic content to change over time, and the temporal aspects of attack, sustain, and decay are likewise determined empirically. These attributes are represented in the invention in a percussive sound file which includes a harmonic content profile (502), noise shape filter (504), Doppler shift profile (506), and a time wave shaping profile (508). The harmonic content profile is used by an FM generator (114) to generate a frequency modulated signal (116). The noise shape profile is used by a noise generator (134) to generate and shape the non-harmonic spectral content. While the sound is being generated, the Doppler shift profile is used to adjust the base frequency of the FM signal. The harmonic and non-harmonic signals are scaled (142, 144) and summed (146). The summed signal is then shaped (150) in time to substantially simulate the attack, sustain, and decay properties of the sound. The shaped, summed signal is then played by an audio circuit and converted to an acoustic signal.

    摘要翻译: 冲击声包含谐波和非谐波频谱内容。 为了再现特定的打击乐音,例如鼓或钹或手拍的声音,例如,经验地确定谐波和非谐波含量。 此外,谐波含量随时间变化的趋势,以及攻击,维持和衰减的时间方面同样由经验确定。 这些属性在本发明中在包括谐波内容轮廓(502),噪声形状滤波器(504),多普勒频移分布(506)和时间波形整形轮廓(508)的冲击声音文件中表示。 谐波含量分布由FM发生器(114)使用以产生调频信号(116)。 噪声形状轮廓由噪声发生器(134)使用以产生和形成非谐波频谱内容。 在产生声音的同时,多普勒频移分布用于调整FM信号的基频。 谐波和非谐波信号被缩放(142,144)并求和(146)。 然后将加和的信号及时成形(150),以基本上模拟声音的攻击,维持和衰减特性。 然后由音频电路播放形状的求和信号,并转换成声信号。

    Method and communication device for providing a personalized ring-back
    4.
    发明申请
    Method and communication device for providing a personalized ring-back 审中-公开
    用于提供个性化回铃的方法和通信设备

    公开(公告)号:US20070121657A1

    公开(公告)日:2007-05-31

    申请号:US11290048

    申请日:2005-11-30

    IPC分类号: H04L12/28

    CPC分类号: H04M3/42017 H04M3/4872

    摘要: The invention concerns a communication device (102) and a method (200) for providing a personalized ring-back to a first user of the first communication device (102), when the first user initiates a phone call with a second user of a second communication device (104). In one arrangement, the method can include the steps of detecting (204) reception of a ring-back signal at the first communication device (102) received from a communication network (108), retrieving (206) a multimedia file in the first communication device (102), and playing (208) the multimedia file in the first communication device (102) for at least the duration of the ring-back signal.

    摘要翻译: 本发明涉及一种通信设备(102)和方法(200),用于当第一用户与第二用户的第二用户发起电话呼叫时,向第一通信设备(102)的第一用户提供个性化回铃 通信设备(104)。 在一种布置中,该方法可以包括以下步骤:在从通信网络(108)接收的第一通信设备(102)处检测(204)接收回铃信号,在第一通信中检索(206)多媒体文件 设备(102),并且至少在回铃信号的持续时间内播放(208)第一通信设备(102)中的多媒体文件。

    Method and system for mitigating background noise for a Sigma-Delta digital-to-analog converter
    5.
    发明申请
    Method and system for mitigating background noise for a Sigma-Delta digital-to-analog converter 有权
    用于减轻Sigma-Delta数模转换器背景噪声的方法和系统

    公开(公告)号:US20070046517A1

    公开(公告)日:2007-03-01

    申请号:US11216292

    申请日:2005-08-31

    IPC分类号: H03M3/00

    CPC分类号: H03M7/3008

    摘要: A sigma delta digital-to-analog (D/A) converter system (10) includes a summing device (35) at an input of a D/A converter (30), and a low frequency low amplitude wave signal (31) injected at an input of the summing device that remains unfiltered and is used to suppress spurious tone artifacts. The D/A converter system can further include an amplitude control and a frequency control for selectively adjusting the frequency and the amplitude of the low frequency low amplitude wave signal being injected. Note, the low frequency low amplitude repeating wave signal generator can take the form of a digital signal processor (DSP) (37) having the appropriate software to generate such signals.

    摘要翻译: Σ-Δ数模(D / A)转换器系统(10)包括在D / A转换器(30)的输入处的加法装置(35)和注入的低频低振幅信号(31) 在相加装置的输入端保持未滤波,并用于抑制杂散音伪像。 D / A转换器系统还可以包括用于选择性地调节被注入的低频低振幅信号的频率和振幅的振幅控制和频率控制。 注意,低频低振幅中继波信号发生器可以采用具有适当软件的数字信号处理器(DSP)(37)的形式来产生这样的信号。

    Balancing MIDI instrument volume levels
    6.
    发明申请
    Balancing MIDI instrument volume levels 有权
    平衡MIDI乐器音量

    公开(公告)号:US20050211075A1

    公开(公告)日:2005-09-29

    申请号:US10796493

    申请日:2004-03-09

    IPC分类号: G10H1/46 G10H7/00 G11C5/00

    摘要: A system, method and computer readable medium for adjusting volume levels of a Musical Instrument Digital Interface (MIDI) sound file for optimizing play on a sound device. The method on an information processing system includes calculating a first set of loudness levels for each instrument in a MIDI sound file and calculating a second set of loudness levels corresponding to an audio output range of a sound device. The method further includes generating a mapping between the first set of loudness levels and the second set of loudness levels corresponding to the audio output range of the sound device. The method further includes generating a gain term for each note in the MIDI sound file and modifying the MIDI sound file using the second set of loudness levels and the gain term for each note in the MIDI sound file.

    摘要翻译: 一种用于调节乐器数字接口(MIDI)声音文件的音量水平的系统,方法和计算机可读介质,用于优化声音设备上的播放。 信息处理系统中的方法包括:计算MIDI声音文件中每个乐器的第一组响度级别,并计算对应于声音设备的音频输出范围的第二组响度级别。 该方法还包括生成第一组响度级别与对应于声音设备的音频输出范围的第二组响度级之间的映射。 该方法还包括为MIDI声音文件中的每个音符生成增益项,并使用第二组响度水平修改MIDI声音文件,并为MIDI声音文件中的每个音符增益增加项。