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公开(公告)号：US5299239A
公开(公告)日：1994-03-29
申请号：US9574
申请日：1993-01-26
CPC分类号： H03M7/3053
摘要： A signal encoding apparatus for cutting out blocks of an input signal waveform at a predetermined time interval and converting the in-block signal by mutually independent conversion axes for encoding, wherein the waveform cutting block length along the time axis is changed according to the input signal.
摘要翻译： 一种信号编码装置，用于以预定的时间间隔切出输入信号波形的块，并通过相互独立的编码转换轴转换块内信号，其中沿着时间轴的波形切割块长度根据输入信号而改变 。
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公开(公告)号：US5197087A
公开(公告)日：1993-03-23
申请号：US553608
申请日：1990-07-18
IPC分类号： H03M7/30
CPC分类号： H03M7/3053
摘要： A signal encoding apparatus for cutting out blocks of an input signal waveform at a predetermined time interval and converting the in-block signal by mutually independent conversion axes for encoding, wherein the waveform cutting block length along the time axis is changed according to the input signal.
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3.再颁专利Method and apparatus for encoding audio signals divided into a plurality of frequency bands 失效用于对分成多个频带的音频信号进行编码的方法和装置
公开(公告)号：USRE36559E
公开(公告)日：2000-02-08
申请号：US245451
申请日：1994-05-18
申请人： Yoshihito Fujiwara , Tomoko Umezawa , Masayuki Nishiguchi , Makoto Akune , Naoto Iwahashi , Kenzo Akagiri
发明人： Yoshihito Fujiwara , Tomoko Umezawa , Masayuki Nishiguchi , Makoto Akune , Naoto Iwahashi , Kenzo Akagiri
摘要： This invention relates to a digital signal encoding apparatus in which the .[.width of the range in.]. .Iadd.digital signal is divided into frequency components in plural frequency bands and the bandwidth of the frequency bands is .Iaddend.selected to be wider for .[.the.]. higher .[.frequency range.]. .Iadd.frequencies .Iaddend.of the digital .[.signals divided into a plurality of regions.]. .Iadd.signal .Iaddend.and in which the encoded signals are synthesized for the respective .[.ranges.]. .Iadd.frequency bands .Iaddend.wherein encoding is controlled as a function of the output detecting the characteristics of the .Iadd.frequency .Iaddend.components .[.of.]. .Iadd.in .Iaddend.the .[.divided.]. frequency .Iadd.bands .Iaddend.and the detection time interval is selected to be longer for the lower frequency .Iadd.bands .Iaddend.to enable more efficient encoding to be performed as a function of the properties of input digital signals.
摘要翻译： 数字信号编码装置本发明涉及一种数字信号编码装置，其中[数字信号的范围]被划分为多个频带的频率分量，频带的带宽被选择为较宽[频率范围 ]频率的数字[信号被分成多个区域]信号，并且其中编码的信号被合成为各个[频带]频带，其中编码被控制为输出的函数，检测频率分量[ ]，并且对于较低频带选择检测时间间隔更长，以使得能够根据输入数字信号的性质执行更有效的编码。
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公开(公告)号：US5299240A
公开(公告)日：1994-03-29
申请号：US9575
申请日：1993-01-26
CPC分类号： H03M7/3053
摘要： A system for encoding audio signals, transmitting or recording the encoded audio signals, and then decoding the transmitted audio signal includes a circuit for determining the block length of the input audio signals based upon detected values of predetermined portions of the input signal and then performing an orthogonal conversion of the determined block length signal, in which the signal is orthogonally transformed from a time-domain signal to a frequency-domain signal. Following quantization, the converted and encoded signal is transmitted and upon performing reverse quantization, a reverse orthogonal converting circuit converts the signal back to the time-domain in keeping with the signal providing information concerning the various block lengths that were determined during encoding. The converted time-domain signals are then connected into a smooth waveform to form output audio signals.
摘要翻译： 用于编码音频信号，发送或记录经编码的音频信号，然后解码所传输的音频信号的系统包括：一个电路，用于根据输入信号的预定部分的检测值确定输入音频信号的块长度，然后执行 所确定的块长度信号的正交转换，其中信号从时域信号正交变换为频域信号。 在量化之后，发送经转换和编码的信号，并且在执行反向量化时，反向正交转换电路根据提供关于在编码期间确定的各种块长度的信息提供信息将信号转换回时域。 然后将转换的时域信号连接成平滑波形以形成输出音频信号。
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公开(公告)号：US5299238A
公开(公告)日：1994-03-29
申请号：US9551
申请日：1993-01-26
CPC分类号： H03M7/3053
摘要： A decoder for reproducing information from an encoded signal that has been frequency-domain transformed by a transform conversion circuit in response to audio signal samples grouped into time-domain blocks based on selected block time lengths, includes a reverse conversion transformation circuit that groups the frequency-domain transfer coefficients into transform blocks based on the block time length information used in the encoding operation and applies the inverse discrete transform function to generate time-domain signal sample blocks therefrom.
摘要翻译： 一种解码器，用于从根据所选择的块时间长度分组成时域块的音频信号样本的变换转换电路进行频域变换的编码信号中再现信息，该解码器包括：反转换变换电路， 基于在编码操作中使用的块时间长度信息将域传输系数转换为变换块，并应用逆离散变换函数从其生成时域信号采样块。
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6.发明授权Method and apparatus for encoding voice signals divided into a plurality of frequency bands 失效用于编码分为多个频率段的语音信号的方法和装置
公开(公告)号：US5115240A
公开(公告)日：1992-05-19
申请号：US586494
申请日：1990-09-21
申请人： Yoshihito Fujiwara , Tomoko Umezawa , Masayuki Nishiguchi , Makoto Akune , Naoto Iwahashi , Kenzo Akagiri
发明人： Yoshihito Fujiwara , Tomoko Umezawa , Masayuki Nishiguchi , Makoto Akune , Naoto Iwahashi , Kenzo Akagiri
IPC分类号： H04B1/66
摘要： This invention relates to a digital signal encoding apparatus in which the width of the range in selected to be wider for the higher frequency range of the digital signals divided into a plurality of regions and in which the encoded signals are synthesized for the respective ranges, wherein encoding is controlled as a function of the output detecting the characteristics of the components of the divided frequency ranges and the detection time interval is selected to be longer for the lower frequency to enable more efficient encoding to be performed as a function of the properties of input digital signals.
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7.发明授权High efficiency encoding device and a noise spectrum modifying device and method 失效高效率编码装置和噪声谱修改装置及方法
公开(公告)号：US5563913A
公开(公告)日：1996-10-08
申请号：US142873
申请日：1993-10-28
申请人： Kenzo Akagiri , Makoto Akune
发明人： Kenzo Akagiri , Makoto Akune
摘要： An apparatus and method for processing an input digital signal in which an input digital audio signal at an input terminal 11 is supplied via a one-block delay unit 17 to a difference unit 20, an output of which is processed by noise-shaping circuit 21 and restored by a near-instantaneous compressor 26, a near-instantaneous expander 27 and an accumulator 28 so as to be fed back to the difference unit 20 to find a difference between a signal of a directly preceding sample and a signal of the current sample. The noise shaping circuit 21 modifies the spectrum of the quantization noise by taking aural characteristics, such as equal-loudness characteristics or masking characteristics, into account for diminishing the level of the quantization noise as perceived by the ear. The noise level as perceived may be reduced in a manner desirable for the sound quality without changing the existing format.
摘要翻译： 一种用于处理输入数字信号的装置和方法，其中输入端子11处的输入数字音频信号经由一块延迟单元17提供给差分单元20，差分单元20的输出由噪声整形电路21 并由近瞬时压缩机26，近瞬时扩展器27和累加器28恢复，以反馈到差分单元20，以找到直接在线样本的信号与当前样本的信号之间的差异 。 噪声整形电路21通过采用诸如等响度特性或掩蔽特性之类的听觉特性来改变量化噪声的频谱，以减少由耳朵感知的量化噪声的电平。 可以以不改变现有格式的声音质量的方式来减少感知到的噪声水平。
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8.发明授权High efficiency encoding device and a noise spectrum modifying device and method 失效高效率编码装置和噪声谱修改装置及方法
公开(公告)号：US5757938A
公开(公告)日：1998-05-26
申请号：US439089
申请日：1995-05-08
申请人： Kenzo Akagiri , Makoto Akune
发明人： Kenzo Akagiri , Makoto Akune
摘要： An apparatus and method for processing an input digital signal in which an input digital audio signal at an input terminal 11 is supplied via a one-block delay unit 17 to a difference unit 20, an output of which is processed by a noise-shaping circuit 21 and restored by a near-instantaneous compressor 26, a near-instantaneous expander 27 and an accumulator 28 so as to be fed back to the difference unit 20 to find a difference between a signal of a directly preceding sample and a signal of the current sample. The noise shaping circuit 21 modifies the spectrum of the quantization noise by taking aural characteristics, such as equal-loudness characteristics or masking characteristics, into account for diminishing the level of the quantization noise as perceived by the ear. The noise level as perceived may be reduced in a manner desirable for the sound quality without changing the existing format.
摘要翻译： 一种用于处理输入数字信号的装置和方法，其中输入端子11处的输入数字音频信号经由一块延迟单元17提供给差分单元20，差分单元20的输出由噪声整形电路 21并由近瞬时压缩机26，近瞬时扩展器27和累加器28恢复，以反馈到差分单元20，以找到直接在前的采样的信号与电流的信号之间的差 样品。 噪声整形电路21通过采用诸如等响度特性或掩蔽特性之类的听觉特性来改变量化噪声的频谱，以减少由耳朵感知的量化噪声的电平。 可以以不改变现有格式的声音质量的方式来减少感知到的噪声水平。
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公开(公告)号：US5204677A
公开(公告)日：1993-04-20
申请号：US729388
申请日：1991-07-12
申请人： Kenzo Akagiri , Makoto Akune
发明人： Kenzo Akagiri , Makoto Akune
CPC分类号： H04B14/046 , G11B20/10527 , H04B1/665
摘要： There is provided a quantizing error reducer for an audio signal, which is constructed to feed a quantizing error back to the input side of a quantizer through a noise filter, wherein the coefficient of the noise filter is set on the basis of information relating to the equiloudness curve, thereby making it possible to reduce the noise in the hearing sense.
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10.发明授权Method and apparatus for altering frequency components of a transformed signal, and a recording medium therefor 失效用于改变变换信号的频率分量的方法和装置及其记录介质
公开(公告)号：US5737717A
公开(公告)日：1998-04-07
申请号：US351386
申请日：1995-02-21
申请人： Kenzo Akagiri , Makoto Akune
发明人： Kenzo Akagiri , Makoto Akune
CPC分类号： G11B20/00007 , G11B20/10527 , H04B1/665
摘要： A signal transforming method and apparatus which improves the quality of a signal, and a recording medium therefore. This method and apparatus alters the frequency components of an acoustic time signal. By altering the frequency components the characteristics of the acoustic time signal is transformed such that its quality is improved. The alteration is such that the difference in magnitude of attributes of frequency components within a substantially critical band are adjusted based on characteristics of auditory sensing.
摘要翻译： PCT No.PCT / JP94 / 00627 Sec。 371日期1995年2月21日 102（e）1995年2月21日PCT PCT 1994年4月14日PCT公布。 出版物WO94 / 24666 日期1994年10月27日提高了信号质量的信号变换方法和装置，以及记录介质。 该方法和装置改变声学时间信号的频率分量。 通过改变频率分量，改变声学时间信号的特性，从而提高其质量。 这种变化使得基于听觉感知的特征来调整基本临界频带内的频率分量的属性的大小差异。
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