公开(公告)号：US20250014548A1

公开(公告)日：2025-01-09

申请号：US18892102

申请日：2024-09-20

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H1/00

Abstract: A sound source system has a configuration including: a plurality of sound source cores that process musical sound data; a phase control circuit that aligns phases of clocks defining an input/output timing of the musical sound data with respect to a sound source core among the plurality of sound source cores; and a connection control circuit that controls connection among the plurality of sound source cores such that musical sound data in which phases of the clocks are aligned is transferred among the plurality of sound source cores.

公开(公告)号：US20150270848A1

公开(公告)日：2015-09-24

申请号：US14661410

申请日：2015-03-18

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: H03M3/00 ,  G10H1/34

CPC classification number: G10H1/34 ,  G10H7/002 ,  G10H2240/071 ,  G10H2250/545 ,  H03M3/388 ,  H03M3/506

Abstract: In the present embodiment, quantizer output values including variation values corresponding to duty errors of pulse width data (PWM output signals) occurring by the difference of the pull-down/pull-up drive characteristics (drive capabilities) of a buffer are stored in advance in a feedback value memory in a quantizer as feedback values FBV0 to FBV4, and a feedback value FBVn read out from the feedback value memory in response to the quantization of a delta-sigma modulation output is inputted into a subtractor by return input. Then, a quantizer output value including a variation value corresponding to a duty error is subtracted from input data Din, and delta-sigma modulation is performed such that the difference is minimized, whereby the duty error of pulse width data (PWM output signal) is compensated.

Abstract translation: 在本实施例中，预先存储包括由缓冲器的下拉/上拉驱动特性（驱动能力）的差引起的脉冲宽度数据（PWM输出信号）的占空比误差对应的量化器输出值 在量化器中的反馈值存储器中作为反馈值FBV0至FBV4，并且响应于Δ-Σ调制输出的量化从反馈值存储器读出的反馈值FBVn通过返回输入被输入减法器。 然后，从输入数据Din中减去包括与占空比误差对应的变化值的量化器输出值，进行Δ-Σ调制使差值最小化，由此脉冲宽度数据（PWM输出信号）的占空误差为 补偿。

公开(公告)号：US20240177699A1

公开(公告)日：2024-05-30

申请号：US18521689

申请日：2023-11-28

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H7/00 ,  G10H1/00

CPC classification number: G10H7/002 ,  G10H1/0008 ,  G10H1/0091 ,  G10H2240/161

Abstract: A signal processing device includes a first memory storing waveform data; a second memory to which the waveform data is being transferred; and a processor configured to execute a first program that imparts a sound effect to samples of the waveform data that have been transferred to the second memory, and a second program that performs burst access to a plurality of samples of the waveform data stored in the first memory so as to transfer the plurality of samples of the waveform data to the second memory, wherein the processor determines an execution schedule of the second program such that a process execution of the first program and a process execution of the second program are respectively completed once in every sampling period of the waveform data.

公开(公告)号：US20230215407A1

公开(公告)日：2023-07-06

申请号：US18181807

申请日：2023-03-10

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H1/10

CPC classification number: G10H1/10 ,  G10H2210/295 ,  G10H2210/245

Abstract: An electronic musical instrument according to one aspect of the invention is configured to generate, in response to an excitation signal corresponding to a specified pitch, a first string signal to be output from one of right and left channels based on a first accumulated signal in which outputs of at least a first closed-loop circuit and a second closed-loop circuit among the first closed-loop circuit, the second closed-loop circuit and a third closed-loop circuit, which are provided to correspond to the specified pitch, are accumulated, and generate a second string signal to be output from the other channel based on a second accumulated signal in which outputs of the second closed-loop circuit and the third closed-loop circuit are accumulated.

公开(公告)号：US20180182364A1

公开(公告)日：2018-06-28

申请号：US15845772

申请日：2017-12-18

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H1/34 ,  G10H1/00 ,  G10H1/053

CPC classification number: G10H1/348 ,  G10H1/0008 ,  G10H1/053 ,  G10H1/08 ,  G10H1/125 ,  G10H2210/271 ,  G10H2220/221 ,  G10H2250/105

Abstract: A musical note generation device includes at least one processor, performing a process of generating convolved sound waveform data by convolving first sound waveform data corresponding to pitch information associated with a specified key with second sound waveform data corresponding to an impulse response; a process of generating third sound waveform data by respectively reducing, among frequency components included in the generated convolved sound waveform data, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information; and a process of outputting piano sound waveform data generated on the basis of the generated third sound waveform data generated.

公开(公告)号：US20220224351A1

公开(公告)日：2022-07-14

申请号：US17706012

申请日：2022-03-28

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: H03M3/00 ,  G10H1/34 ,  G10H7/08

Abstract: A digital-to-analog conversion device which performs integration processing for integrating a difference between an input signal and a first return signal generated based on the input signal, and outputting an integration result, first quantization processing for quantizing the integration result, and outputting a first quantization signal, first return signal output processing for outputting the first return signal by adding to the first quantization signal a correction value delay signal acquired by a correction value signal outputted based on the integration result being delayed, and output processing for outputting output signals including a signal whose pulse width is asymmetrical to center of a processing period, based on the first quantization signal, in which the correction value signal includes a signal indicating a correction value for correcting a difference between a center of the pulse width asymmetrical to the center of the processing period and the center of the processing period.

公开(公告)号：US20210090539A1

公开(公告)日：2021-03-25

申请号：US17020958

申请日：2020-09-15

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H1/055

Abstract: According to one aspect, there is an electronic musical instrument including operators which includes a first operator corresponding to a first pitch and a second operator corresponding to a second pitch, and a sound source configured to generate a first output signal from a first close loop and a second output signal from a second close loop, to generate an integration signal, and return a subtraction signal, the subtraction signal being obtained by subtracting a signal circulating through the first close loop from the integration signal, to the first close loop, and then output a musical sound signal including signal components corresponding to the second pitch as a musical sound signal corresponding to the first pitch.

公开(公告)号：US20190139524A1

公开(公告)日：2019-05-09

申请号：US16239073

申请日：2019-01-03

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H7/00 ,  G06F16/61 ,  G10H1/00 ,  G11B20/12 ,  G10H7/04 ,  G10H7/02

CPC classification number: G10H7/008 ,  G06F16/61 ,  G10H1/0041 ,  G10H7/02 ,  G10H7/04 ,  G10H2240/071 ,  G10H2240/131 ,  G10H2240/161 ,  G10H2250/595 ,  G10H2250/601 ,  G10L19/167 ,  G11B20/1251

Abstract: A waveform data structure includes a plurality of types of frames having different data sizes. Each of the plurality of types of frames includes an auxiliary information area and a data area. The auxiliary information area includes an area for storing common effective-bit length data for a section of waveform samples, and an area for storing an identifier for identifying one of the plurality of types of frames. The data area is an area for storing extracted waveform samples which are extracted from the waveform samples based on the common effective-bit length. The number of the extracted waveform samples is determined based on the common effective-bit length.

公开(公告)号：US20160283431A1

公开(公告)日：2016-09-29

申请号：US15058380

申请日：2016-03-02

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G06F13/42 ,  G11C7/10 ,  G06F13/16

CPC classification number: G06F13/4234 ,  G06F13/1636

Abstract: A double buffer (four pages×2 system) constituted by a DSP program buffer (D-RAM) and a prefetch program buffer (D-RAM) is provided, and burst access is performed collectively for four samplings from the prefetch program buffer (D-RAM). When this burst access is performed, a decline in performance caused by latency that occurs each time an external memory (DDR-SDRAM) is accessed is avoided by accessing with sequential addresses.

Abstract translation: 提供由DSP程序缓冲器（D-RAM）和预取程序缓冲器（D-RAM）构成的双缓冲器（4页×2系统），并从预取程序缓冲器（D -随机存取存储器）。 当执行这种突发存取时，通过访问连续的地址来避免在每次访问外部存储器（DDR-SDRAM）时发生的延迟引起的性能下降。

公开(公告)号：US20210295807A1

公开(公告)日：2021-09-23

申请号：US17192203

申请日：2021-03-04

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Goro SAKATA

IPC: G10H1/053 ,  G10H1/08 ,  G10H1/34 ,  G10H1/00 ,  G10H1/12

Abstract: An electronic musical instrument according to one embodiment includes playing operators specifying respective pitches, and at least one processor which is configured to execute processing of acquiring string sound data including a fundamental sound component and a harmonic tone component corresponding to a specified pitch, acquiring stroke sound waveform data that does not include the fundamental sound component and the harmonic tone component corresponding to the specified pitch but includes components other than the fundamental sound component and the harmonic tone component, and synthesizing the string sound data and stroke sound data corresponding to the stroke sound waveform data at a set ratio.