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1. 发明申请

WO1998011532A1 WAVETABLE SYNTHESIZER AND OPERATING METHOD USING A VARIABLE SAMPLING RATE APPROXIMATION 审中-公开
标题翻译：可变合成器和使用可变采样速率近似的操作方法
公开(公告)号：WO1998011532A1
公开(公告)日：1998-03-19
申请号：PCT/US1997016140
申请日：1997-09-10
申请人： CIRRUS LOGIC, INC.
发明人： CIRRUS LOGIC, INC. , JENKINS, Michael
IPC分类号： G10H07/02
CPC分类号： G10H1/125 , G10H7/02 , G10H2210/205 , G10H2210/281 , G10H2210/305 , G10H2240/056 , G10H2240/145 , G10H2250/061 , G10H2250/105 , G10H2250/121
摘要： A variable sample rate approximation technique is used for coding and recreating musical signals in a wavetable synthesizer. Many sounds inherently include one large fast transfer of energy followed by vibrations that dampen over time so that the bandwidth requirement of a musical sound is reduced with passing time. Using the variable sample rate approximation technique, musical sounds are classified into two categories, sustaining sounds and percussive sounds. A sustaining instrument creates a noisy stimulus then sustains the sound created by the noisy stimulus. A percussive instrument is also a noisy source and generates a sound signal having high frequencies that decay rapidly while sustaining instruments sustain at all frequencies nearly equally. The sustaining and percussive instruments have substantially different waveform characteristics but present similar conditions with respect to memory reduction. Similarities between the acoustical characteristics of sustaining sounds and percussive sounds are exploited using a variable sampling rate technique to substantially reduce the memory budget of a wavetable synthesizer.
摘要翻译：可变采样率近似技术用于在波形合成器中编码和再现音乐信号。许多声音固有地包括一个大的快速的能量传递，随后随着时间的推移而衰减的振动，使得音乐声音的带宽需求随着时间的流逝而减少。使用可变采样率近似技术，音乐声音分为两类，维持声音和打击乐。持续的工具产生嘈杂的刺激，然后维持由嘈杂的刺激产生的声音。打击乐器也是噪音源，并产生具有高频衰减的声音信号，同时维持仪器在所有频率下几乎保持平等。持续和打击乐器具有基本上不同的波形特性，但在存储器减少方面存在相似的条件。使用可变采样率技术来利用持续声音和打击乐声音的声学特性之间的相似性，以显着降低波形合成器的存储器预算。

2. 发明申请

WO1996018995A1 PC AUDIO SYSTEM WITH WAVETABLE CACHE 审中-公开
标题翻译：带音频缓存的PC音频系统
公开(公告)号：WO1996018995A1
公开(公告)日：1996-06-20
申请号：PCT/US1995014347
申请日：1995-11-02
申请人： ADVANCED MICRO DEVICES, INC.
发明人： ADVANCED MICRO DEVICES, INC. , HEWITT, Larry
IPC分类号： G10H07/02
CPC分类号： G10H7/02 , G10H1/186
摘要： The PC audio circuit described interfaces with and provides audio enhancement to a host personal computer of the type including a central processor, system memory and a system bus. The PC audio circuit includes a digital signal processor (DSP) for processing wavetable data and generating digital audio signals for a plurality of voices. The wavetable data is stored in the host computer's system memory and transferred in portions, as needed by the DSP, to a smaller, low-cost cache memory included with the PC audio circuit. The DSP processes several frames of data samples for an active voice before processing another voice. Processing in this manner reduces the percentage use of system bus bandwidth and alleviates concerns about the maximum allowable system bus latency. Digital audio signals generated for each active voice are accumulated in cache memory. When the digital audio signals for all active voices have been accumulated, the accumulated data is transmitted from the cache memory to an external digital-to-analog converter. Since wavetable data is stored in system memory, the cache memory is smaller and less expensive than the local memory in prior art PC audio circuits. Thus, the described PC audio circuit has a lower overall cost.
摘要翻译：描述的PC音频电路与包括中央处理器，系统存储器和系统总线的主机个人计算机接口并提供音频增强。 PC音频电路包括用于处理波形数据并产生用于多个语音的数字音频信号的数字信号处理器（DSP）。波形数据存储在主计算机的系统存储器中，并且根据DSP的需要被部分地传送到PC音频电路附带的较小的低成本的高速缓冲存储器中。在处理另一个声音之前，DSP处理多帧数据样本以获得主动语音。以这种方式处理减少了系统总线带宽的百分比使用，并减轻了对最大允许系统总线延迟的担忧。为每个活动语音生成的数字音频信号被累积在高速缓冲存储器中。当所有活动语音的数字音频信号已被累积时，累加的数据从高速缓冲存储器发送到外部数模转换器。由于波形数据存储在系统存储器中，因此高速缓冲存储器比现有技术的PC音频电路中的本地存储器更小且更便宜。因此，所描述的PC音频电路具有较低的总成本。

3. 发明申请

WO1997031363A1 PC AUDIO SYSTEM WITH FREQUENCY COMPENSATED WAVETABLE DATA 审中-公开
标题翻译：具有频率补偿波形数据的PC音频系统
公开(公告)号：WO1997031363A1
公开(公告)日：1997-08-28
申请号：PCT/US1997002811
申请日：1997-02-21
申请人： ADVANCED MICRO DEVICES, INC.
发明人： ADVANCED MICRO DEVICES, INC. , HEWITT, Larry
IPC分类号： G10H07/02
CPC分类号： G10H7/004 , G10H7/02 , G10H2230/031 , G10H2240/275
摘要： The PC audio circuit (10) described interfaces with and provides audio enhancement to a host personal computer of the type including a central processor, system memory and a system bus. The PC audio circuit (10) includes a digital signal processor (DSP) (16) for processing wavetable data and generating digital audio signals for a plurality of voices. The wavetable data is stored in the host computer's system memory and transferred in portions, as needed by the DSP (16) to a smaller, low-cost cache memory (22) included with the PC audio circuit (10). The DSP (16) processes several frames of data samples for an active voice before processing another voice. Processing in this manner alleviates concerns about the percentage use of system bus bandwidth and the maximum allowable system bus latency. These concerns are further alleviated by deriving frequency compensated wavetable data and storing it in system memory to be retrieved by the DSP (16) for generating digital audio signals having high frequency ratios. Digital audio signals generated for each active voice are accumulated in cache memory (22). When the digital audio signals for all active voices have been accumulated, the accumulated data is transmitted from the cache memory (22) to an external digital-to-analog converter. Since wavetable data is stored in system memory, the cache memory (22) is smaller and less expensive than the local memory in prior art PC audio circuits. Thus, the described PC audio circuit (10) has a lower overall cost.
摘要翻译：描述的PC音频电路（10）与包括中央处理器，系统存储器和系统总线的主机个人计算机接口并提供音频增强。 PC音频电路（10）包括用于处理波形数据并产生多个语音的数字音频信号的数字信号处理器（DSP）（16）。波形数据被存储在主计算机的系统存储器中，并且根据DSP（16）的需要，以包括在PC音频电路（10）中的较小的，低成本的高速缓冲存储器（22）的一部分传送。在处理另一个声音之前，DSP（16）处理主动语音的多个数据采样帧。以这种方式进行的处理减轻了对系统总线带宽的使用百分比和最大允许系统总线延迟的担忧。通过导出频率补偿波形数据并将其存储在由DSP（16）检索以产生具有高频率的数字音频信号的系统存储器中，进一步减轻了这些问题。为每个活动语音生成的数字音频信号被累积在高速缓存存储器（22）中。当用于所有活动语音的数字音频信号已被累积时，累积的数据从高速缓冲存储器（22）发送到外部数模转换器。由于波形数据存储在系统存储器中，高速缓冲存储器（22）比现有技术的PC音频电路中的本地存储器更小且更便宜。因此，所描述的PC音频电路（10）具有较低的总成本。

4. 发明申请

WO1992015087A1 MUSICAL DATA STORAGE TECHNIQUES 审中-公开
标题翻译：音乐数据存储技术
公开(公告)号：WO1992015087A1
公开(公告)日：1992-09-03
申请号：PCT/GB1992000269
申请日：1992-02-14
申请人： STUDIO AUDIO & VIDEO LIMITED , KEMP, Michael, Joseph , BULL, Andrew, Jeremy
发明人： STUDIO AUDIO & VIDEO LIMITED
IPC分类号： G10H07/02
CPC分类号： G10H7/02 , G10H2250/611 , G10H2250/635
摘要： A plurality of data segments such as sound recordings, are stored on a mass storage device (21). A first portion of each sound segment is stored in an i.c. memory (12) so as to be instantly available. Addressing circuits (20, 5) is provided and is operable in response to signals from a controller (10) to read first the portion of a data segment stored in i.c. memory (12) and then the portion on the mass storage device (21) so as to give substantially simultaneous playback of data. It is desirable to be able to simulate fast playback of data and in order to achieve this data is recorded in a mass storage device (120) with every nth sample in the data stream also being recorded in a fast block (51). As desired playback speed is increased only data from the fast block (51) is replayed.

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