Casio Computer Co., Ltd.

Goro Sakata

Kohtaro Hanzawa

Kikuji Tanaka

Ryutaro Hayashi

Akira Ikeda

Akio Iba

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.

Electronic musical instrument, electronic keyboard musical instrument, and method of generating musical sound

An electronic keyboard musical instrument includes a sound source configured to, in response to detection of key-pressing of the first key in damper-off detection, input first excitation signal data corresponding to the first key to a first channel, input first channel output data which is output from the first channel to each of low-register channels corresponding to the respective low-register keys, and output musical sound data which is generated based on respective pieces of low-register channel output data which is output from the respective low-register channels and the first channel output data, as musical sound data corresponding to the first key.

Electronic keyboard musical instrument and method of generating musical sound

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.

D/A conversion device, method, storage medium, electronic musical instrument, and information processing apparatus

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.

Electronic musical instrument, method of generating musical sound, and storage medium

An electronic musical instrument includes a playing operator, and a sound source which performs processing of receiving, in response to a user operation on the playing operator, a sound generation instruction according to playing operation information including the pitch information indicating the certain pitch and sound volume information indicating a certain volume, and generating sound according to the certain pitch and the certain volume, based on excitation data generated by multiplying partial data by a window function, the partial data being included in excitation signal waveform data generated based on a plurality of waveform data items which are respectively different from each other in sound intensity in the certain pitch.

Electronic musical instrument and method of causing electronic musical instrument to perform processing

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.

Waveform data structure, waveform data storage device, waveform data storing method, waveform data extracting device, waveform data extracting method and electronic musical instrument

A first contact and a second contact are provided at each of a plurality of keys, and are successively closed in accordance with a key press operation. On the basis of respective closed sense signals from the first contact and the second contact, a duration from when the first contact is closed until the second contact is closed is counted as a first count value and then a duration after this counting has ended is counted as a second count value. An attainment duration value and the second count value are compared, and when a predetermined condition is satisfied, a control signal is outputted. When this control signal is received, sound emission information instructing an emission of a sound by a sound emission controller is sent. The sound emission information includes touch information based on the first count value.

Touch sensing device, touch sensing unit, storage medium and touch sensing method

A digital-to-analog converter performs a &#x394;&#x3a3; computation process to start the &#x394;&#x3a3; computation based upon the second clock signal with respect to the digital data of music sound if the &#x394;&#x3a3; computation is not under execution when the control signal is outputted by the signal output process, a control process to inhibit the &#x394;&#x3a3; computation based upon the second clock signal from being started with respect to the digital data of music sound until the &#x394;&#x3a3; computation is not under execution when the &#x394;&#x3a3; computation is under execution, and an output process to convert a computation result of the &#x394;&#x3a3; computation process into an analog signal and output the analog signal.

D/A converter, electronic musical instrument, information processing device and D/A conversion method

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.

Musical note generation device, electronic musical instrument, method, and storage medium

A musical note generation device includes at least one processor that performs a process of generating attenuated sound waveform data by respectively reducing, among frequency components included in first sound waveform data corresponding to pitch information associated with a specified key, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information; a process that convolves the generated attenuated sound waveform data generated with second sound waveform data corresponding to at least one of a high sound range side impulse response and a low sound range side impulse response, so as to generate third sound waveform data; and a process of outputting piano sound waveform data generated on the basis of the third sound waveform data generated by the convolution process.

A double buffer (four pages&#xd7;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.

Signal processing device, method of signal processing, storage medium, and electronic musical instrument

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 FBVto FBV, 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.

D/A conversion apparatus, D/A conversion method and electric musical instrument

For respective sampling data of waveform data of sounds to be coded, a prediction residual value is calculated as sampling residual data, and an effective bit length is calculated from this residual waveform data. Then, for the effective bit length data, a maximum effective bit length among processing targets is generated as common effective actual data, and coded data in which this common effective actual data and information indicating the common effective bit length are arranged in a predetermined configuration format are generated. The information included in the coded data is analyzed and each of the plurality of the common effective bit information is extracted. Then, waveform data of the sounds are decoded by performing inverse linear prediction processing from an analysis result on the residual waveform data decompressed by performing bit extension which adds a portion other than the common effective bit length.

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Hamura, Japan

Goro Sakata