公开(公告)号：US4371973A

公开(公告)日：1983-02-01

申请号：US158241

申请日：1980-06-10

申请人： Tore Fjallbrant

发明人： Tore Fjallbrant

IPC分类号： H04B1/66 ,  H03K3/013 ,  H03K5/156

CPC分类号： H04B1/66

摘要： An apparatus for transmitting and receiving signals representing such as speech. The apparatus provides for transforming a uniformly sampled signal to a non-uniformly sampled signal in a transmitter, transferring the signal thus non-uniformly sampled to a receiver and re-transforming the transferred non-uniformly sampled signal to a uniformly sampled signal in the receiver. In the transmitter, both a wave analyzer and a time-frequency transformer are coupled between a delay chain and a logic unit. A switch also is provided for excluding certain samples in response to a control signal from the logic unit. The control signal contains information on frequency sectors comprising samples with signal amplitudes which are low in relation to samples in other sectors. In the receiver, two delay chains are coupled together in series and one of the delay chains is coupled to a multiplication circuit. The output of the multiplication circuit is coupled to an addition circuit providing the output of the apparatus. The logic signal is received by the receiver and is used to select the multiplication coefficients for the multiplication circuit. The signals re-transformed have better quality due to the elimination of quantization noise and a more exact transfer of the frequency content of the signal.

摘要翻译： 一种用于发送和接收表示诸如语音的信号的装置。 该装置提供将均匀采样的信号变换到发射机中的非均匀采样信号，将由此非均匀采样的信号传送到接收机，并将传输的非均匀采样信号重新转换为接收机中均匀采样的信号 。 在发射机中，波分析仪和时频变压器都耦合在延迟链和逻辑单元之间。 还提供了用于响应于来自逻辑单元的控制信号排除某些样本的开关。 控制信号包含关于频率扇区的信息，其包括相对于其他扇区中的样本具有低信号幅度的样本。 在接收机中，两个延迟链串联在一起，其中一个延迟链耦合到乘法电路。 乘法电路的输出耦合到提供设备输出的加法电路。 逻辑信号由接收机接收并用于选择乘法电路的乘法系数。 重新变换的信号由于消除量化噪声和信号的频率内容的更精确的传输而具有更好的质量。

公开(公告)号：US4271500A

公开(公告)日：1981-06-02

申请号：US8616

申请日：1979-02-01

申请人： Tore Fjallbrant

发明人： Tore Fjallbrant

IPC分类号： H04B1/66 ,  G10L1/06 ,  G06G7/19 ,  G06G7/30

CPC分类号： H04B1/66 ,  H04B1/662

摘要： A device for forming omitted samples by extrapolation in a transmitted signal having non-uniform, grouped samples representing a short-time stationary signal such as speech. The grouped samples are passed through a series of delay circuits. Fourier transformation of the samples is performed to form omitted samples which are inserted in the signal between the grouped samples. The Fourier transformation is used to select multiplication coefficients which are multiplied by the sample amplitudes, with the products of the multiplication being summed to form the omitted samples. In one embodiment the extrapolation is performed in both carry forward and carry back circuits.

摘要翻译： 一种用于通过在具有表示短时间固定信号（例如语音）的不均匀的分组样本的发送信号中的外推来形成省略的样本的装置。 分组的样本通过一系列延迟电路。 执行样本的傅立叶变换以形成插入到分组样本之间的信号中的省略的样本。 傅里叶变换用于选择乘以样本幅度的乘法系数，乘法乘积相加以形成省略的样本。 在一个实施例中，外推在进位和回送电路中执行。