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1.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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2.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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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：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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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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公开(公告)号：US5151941A
公开(公告)日：1992-09-29
申请号：US588715
申请日：1990-09-07
CPC分类号： H04B1/665
摘要： A digital signal encoding apparatus in which input digital signals are divided into a plurality of frequency bands so that the bandwidth of each frequency band will be greater the higher the frequency band, the allowable noise level is set for each frequency band on the basis of the energy value of each frequency band, and components of each frequency band are quantized with the number of bits consistent with the level difference between the energy of each frequency band and the preset allowable noise level. The output information volume following the quantization is detected and the number of bits of allocation for quantization is corrected in dependence upon the error between the detection output and the target value to render the information volume constant over a predetermined time period to enable bit rate adjustment or bit packing with lesser signal deterioration by a simplified construction.
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公开(公告)号：US5241603A
公开(公告)日：1993-08-31
申请号：US703830
申请日：1991-05-21
申请人： Kenzo Akagiri , Kyoya Tsutsui , Yoshihito Fujiwara
发明人： Kenzo Akagiri , Kyoya Tsutsui , Yoshihito Fujiwara
摘要： The present invention relates to a digital signal encoding apparatus in which an input digital signal has its frequency range divided into a number of frequency bands so that the bandwidths are broader at higher frequencies. A first allowable noise level based on the energy levels in the respective bands, and a second allowable noise level based on the energies of the signals temporally adjacent to the signals of a frequency band under consideration, are set. Signal components of each frequency band are quantized with a number of bits corresponding to a difference between an output synthesized from the first and second noise levels and the energy level of each frequency band. In this manner, the bit rate may be lowered while deterioration in the sound quality is minimized.
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公开(公告)号：US20050240296A1
公开(公告)日：2005-10-27
申请号：US11158880
申请日：2005-06-22
CPC分类号： H04R5/04 , G10L19/02 , G11C7/16 , G11C2207/16 , H04R1/1016 , H04R1/1041 , H04R5/033 , H04R2201/103 , H04R2430/03
摘要： A small-sized audio signal reproducing apparatus for hearing reproduced audio signals with the aid of a headphone is disclosed. Digitized and compression encoded audio signals, stored in a semiconductor memory, are read out so as to undergo a decoding operation, which is an inverse operation to compression encoding, to reproduce the audio signals, and the reproduced signals are heard by the headphone. The apparatus may be significantly reduced in size and weight as compared to the apparatus in which a tape or a disk is used as the recording medium.
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公开(公告)号：US06695477B1
公开(公告)日：2004-02-24
申请号：US08747910
申请日：1996-11-12
IPC分类号： H04R110
CPC分类号： H04R1/1041 , G11C7/16 , H04R1/1008 , H04R1/1016 , H04R5/033 , H04R2201/103
摘要： A small-sized audio signal reproducing apparatus for hearing reproduced audio signals with the aid of a headphone is disclosed. Digitized and compression encoded audio signals, stored in a semiconductor memory, are read out so as to undergo a decoding operation, which is an inverse operation to compression encoding, to reproduce the audio signals, and the reproduced signals are heard by the headphone. The apparatus may be significantly reduced in size and weight as compared to the apparatus in which a tape or a disk is used as the recording medium.
摘要翻译： 公开了一种借助于耳机用于听到再现的音频信号的小尺寸音频信号再现装置。 存储在半导体存储器中的数字化和压缩编码的音频信号被读出，以便进行与压缩编码相反的操作的解码操作，以再现音频信号，再现的信号由耳机听到。 与使用带或盘作为记录介质的装置相比，该装置的尺寸和重量可以显着减小。
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