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公开(公告)号：US09735796B2
公开(公告)日：2017-08-15
申请号：US14884155
申请日：2015-10-15
发明人： Akira Yasuda , Jun-ichi Okamura
CPC分类号： H03M1/066 , H03M1/74 , H03M3/502 , H04R3/00 , H04R2420/03
摘要： Provided is a selection device including an acquisition section for acquiring digital selection signals, and an output section for outputting selection signals to respective unit cells, each unit cell capable of being commanded to output the value zero. The selection device is characterized in that: each selection signal is for commanding the unit cell to output a value corresponding to that selection signal; the sum of the values to be output as commanded by the respective selection signals, which are output to the respective unit cells, is a value determined in association with the digital selection signal; and if the output corresponding to the digital selection signal is the value zero, then selection signals each commanding to output a non-zero value (N) are output to some of the unit cells.
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公开(公告)号：US09628928B2
公开(公告)日：2017-04-18
申请号：US14926352
申请日：2015-10-29
发明人： Akira Yasuda , Jun-ichi Okamura
IPC分类号： H04R29/00
CPC分类号： H04R29/003 , H04R2209/022 , H04R2209/041
摘要： A speaker control device in one embodiment includes a time to digital converter connected to a drive power source in series with a drive circuit for driving a plurality of coils of a speaker, the converter outputting a digital data in accordance with a voltage of the drive power source, and a monitor circuit detecting a state of the plurality of coils of the speaker based on digital data output by the time to digital converter.
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公开(公告)号：US09544691B2
公开(公告)日：2017-01-10
申请号：US14722780
申请日：2015-05-27
发明人： Akira Yasuda , Jun-ichi Okamura
CPC分类号： H04R3/14 , G06F17/3074 , H04R3/12 , H04R2420/00 , H04R2420/03 , H04R2420/05 , H04R2430/01 , H04R2430/03 , H04R2499/13
摘要： An acoustic playback system including a digital filter; and a plurality of digital modulators each of which output a digital signal to one of a plurality of speakers driven by digital signals having different play back bandwidths; wherein the digital filter converts a digital audio signal which is input into a plurality of digital audio signals of a plurality of frequency bandwidths corresponding to play back bandwidths of the speakers, and outputs each of the digital audio signals of the plurality of frequency bandwidths to one of the plurality of digital modulators; each of the digital modulators outputs the modulated digital signal to the speaker of a play back bandwidth corresponding to a frequency bandwidth of the digital audio signal which is input by performing miss-match shaping after noise shaping to a digital audio signal; and each number of bits of a digital signal of the digital modulators is different.
摘要翻译： 包括数字滤波器的声学回放系统; 以及多个数字调制器，每个数字调制器将数字信号输出到由具有不同播放带宽的数字信号驱动的多个扬声器之一; 其中数字滤波器将输入的数字音频信号转换成与扬声器的播放带宽对应的多个频率带宽的多个数字音频信号，并将多个频率带宽的每个数字音频信号输出到一个 的多个数字调制器; 每个数字调制器将经调制的数字信号输出到与通过在噪声整形之后执行未命中匹配整形到数字音频信号而输入的数字音频信号的频带带宽相对应的播放带宽的扬声器; 并且数字调制器的数字信号的每个位数不同。
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公开(公告)号：US09362943B2
公开(公告)日：2016-06-07
申请号：US14695385
申请日：2015-04-24
发明人： Akira Yasuda , Jun-ichi Okamura
摘要： Provided is a data converter which is provided with a clock signal input part which inputs a clock signal, and an input part which inputs an input signal, a sampling part which, in response to the clock signal input to the clock signal input part, performs sampling of the input signal input to the input part, and a signal processing part which performs signal processing according to the sampling cycle and outputs an output signal, wherein when the cycle of the clock signal input to the clock signal input part becomes longer, the output signals output by the signal processing part are reduced.
摘要翻译： 提供了一种数据转换器，其设置有输入时钟信号的时钟信号输入部分和输入输入信号的输入部分，响应于输入到时钟信号输入部分的时钟信号执行的采样部分 输入到输入部的输入信号的采样，以及根据采样周期执行信号处理的信号处理部，输出输出信号，其中，当输入到时钟信号输入部的时钟信号的周期变长时， 减少由信号处理部输出的输出信号。
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公开(公告)号：US20150310024A1
公开(公告)日：2015-10-29
申请号：US14722780
申请日：2015-05-27
发明人： Akira Yasuda , Jun-ichi Okamura
IPC分类号： G06F17/30
CPC分类号： H04R3/14 , G06F17/3074 , H04R3/12 , H04R2420/00 , H04R2420/03 , H04R2420/05 , H04R2430/01 , H04R2430/03 , H04R2499/13
摘要： An acoustic playback system including a digital filter; and a plurality of digital modulators each of which output a digital signal to one of a plurality of speakers driven by digital signals having different play back bandwidths; wherein the digital filter converts a digital audio signal which is input into a plurality of digital audio signals of a plurality of frequency bandwidths corresponding to play back bandwidths of the speakers, and outputs each of the digital audio signals of the plurality of frequency bandwidths to one of the plurality of digital modulators; each of the digital modulators outputs the modulated digital signal to the speaker of a play back bandwidth corresponding to a frequency bandwidth of the digital audio signal which is input by performing miss-match shaping after noise shaping to a digital audio signal; and each number of bits of a digital signal of the digital modulators is different.
摘要翻译： 包括数字滤波器的声学回放系统; 以及多个数字调制器，每个数字调制器将数字信号输出到由具有不同播放带宽的数字信号驱动的多个扬声器之一; 其中数字滤波器将输入的数字音频信号转换成与扬声器的播放带宽对应的多个频率带宽的多个数字音频信号，并将多个频率带宽的每个数字音频信号输出到一个 的多个数字调制器; 每个数字调制器将经调制的数字信号输出到与通过在噪声整形之后执行未命中匹配整形到数字音频信号而输入的数字音频信号的频带带宽相对应的播放带宽的扬声器; 并且数字调制器的数字信号的每个位数不同。
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公开(公告)号：US09973850B2
公开(公告)日：2018-05-15
申请号：US15003146
申请日：2016-01-21
发明人： Akira Yasuda , Jun-ichi Okamura
CPC分类号： H04R3/007 , H04R1/005 , H04R3/002 , H04R29/003
摘要： A speaker control device in one embodiment includes an oscillator connected in parallel with a drive circuit for driving a speaker, the oscillator changing an oscillation frequency according to a voltage, and a control circuit detecting a variation in the oscillation frequency of the oscillator, and adjusting an amount of current supplied to the speaker by the drive circuit in the case where a variation in the voltage exceeds an allowable value.
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公开(公告)号：US09693136B2
公开(公告)日：2017-06-27
申请号：US14919349
申请日：2015-10-21
发明人： Jun-ichi Okamura , Akira Yasuda
IPC分类号： H03F3/00 , H04R3/00 , H04R1/00 , H04R3/12 , H03F3/21 , H03F3/217 , H04R1/10 , H04R15/00 , H04R27/00
CPC分类号： H04R3/00 , H03F3/211 , H03F3/217 , H04R1/005 , H04R1/1008 , H04R3/12 , H04R15/00 , H04R27/00 , H04R2227/003 , H04R2499/13 , H04R2499/15
摘要： A digital sound system suitable for a digital speaker device to directly convert analog sound by a circuit using a ΔΣ modulator and a mismatch shaping filter circuit to output a plurality of digital signals and a plurality of speakers driven by the plurality of digital signals. A digital speaker driving device includes a ΔΣ modulator, a post filter, s driving circuits, and a power supply circuit to supply power to the ΔΣ modulator, the post filter and the s driving elements, and the s driving circuits are adapted to s digital signal terminals.
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公开(公告)号：US20160205471A1
公开(公告)日：2016-07-14
申请号：US14993955
申请日：2016-01-12
发明人： Akira Yasuda , Junichi Okamura
CPC分类号： H04R3/08 , H03G3/20 , H03H15/00 , H03M3/344 , H03M3/414 , H03M3/504 , H03M7/3022 , H04R1/005 , H04R3/00 , H04R17/005
摘要： A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.
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公开(公告)号：US11057706B2
公开(公告)日：2021-07-06
申请号：US16920478
申请日：2020-07-03
发明人： Akira Yasuda , Jun-ichi Okamura , Hiroshi Iwamura
摘要： A speaker driving device includes a first calculation unit, a first driving signal generation unit and a third calculation unit. The first calculation unit outputs a first calculation signal obtained from a first input signal based on response characteristics according to a first parameter defining an equivalent circuit of a first speaker unit. The first driving signal generation unit generates a first driving signal based on a second driving signal and the first calculation signal. The first driving signal drives a first output speaker unit. The third calculation unit generates a third calculation signal from a second input signal based on response characteristics according to a third parameter defining an equivalent circuit of a third speaker unit. The second driving signal generation unit generates the second driving signal based on the first driving signal and the third calculation signal. The second driving signal drive a second output speaker unit.
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公开(公告)号：US09793868B2
公开(公告)日：2017-10-17
申请号：US14260793
申请日：2014-04-24
发明人： Akira Yasuda , Jun-ichi Okamura
CPC分类号： H03F3/2175 , G06F17/3074 , H03F2200/331 , H04H20/88 , H04R1/005 , H04R3/00 , H04R9/063 , H04R27/00 , H04R2209/026 , H04R2209/041 , H04R2460/03
摘要： Provided is a digital acoustic system comprising: a ΔΣ modulator that modulates a digital input signal and outputs a digital signal; a post-filter that is connected to the ΔΣ modulator and which performs mismatch shaping to convert the digital signal; a parallel-serial converter that converts the digital signal converted by the post-filter into a digital signal which is serially transmitted; a serial-parallel converter that restores the digital signal converted by the parallel-serial converter; and a drive circuit which receives the digital signal restored by the serial-parallel converter, and drives drive elements to convert the signal into an analog audio signal.
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