公开(公告)号：US4757495A

公开(公告)日：1988-07-12

申请号：US836438

申请日：1986-03-05

申请人： Dwight W. Decker ,  Payne Freret ,  Dirk Hughes-Hartogs ,  Mark B. Flowers ,  Frederick L. Mueller

发明人： Dwight W. Decker ,  Payne Freret ,  Dirk Hughes-Hartogs ,  Mark B. Flowers ,  Frederick L. Mueller

IPC分类号： H04L27/26 ,  H04M11/06 ,  H04J1/14

CPC分类号： H04L5/0005 ,  H04L5/0044 ,  H04M11/062 ,  H04L5/0053

摘要： The present invention relates to an apparatus and method for the simultaneous transmission of analog speech and modulated data, such apparatus and method being optimized for use over impaired and bandwidth restricted analog channels, or digital representations of such channels. In each instance of use, an evaluation is made of the available channel bandwidth, with a frequency division multiplex scheme allocating a voice sub-band, with data transmission allocated to sub-bands above, below, or around, this selected voice sub-band. The speech and data sub-band allocations are made by the multiplexor in response to user input of either a requested speech quality, a requested data rate, or a value indicating the relative user weighting of speech quality and data rate. A multi-carrier multi-mode modulation scheme is employed for data transmission, with this scheme having the ability to fully utilize the remaining bandwidth, and further, being capable of adapting to the impairments most likely present on the fringes of bandwidth restricted analog channels. When the analog channel employed is the standard voice-grade telephone circuit, good speech quality simultaneously with 3000 bps data transmission may be expected. The further ability to automatically switch to full bandwidth data transmission when voice transmission is not being attempted is also provided.

摘要翻译： 本发明涉及一种用于同时传输模拟语音和调制数据的装置和方法，该装置和方法被优化用于受损和带宽限制的模拟信道或这些信道的数字表示。 在每个使用情况下，对可用信道带宽进行评估，其中分配多个分配多个方式的语音子带，其数据传输被分配给该选择的话音子带上方，下方或周围的子带 。 响应于请求的语音质量，请求的数据速率或指示语音质量和数据速率的相对用户权重的值的用户输入，多路复用器进行语音和数据子带分配。 采用多载波多模调制方案进行数据传输，该方案具有充分利用剩余带宽的能力，并且还能够适应最有可能存在于带宽限制的模拟信道边缘上的损伤。 当采用的模拟通道是标准语音级电话电路时，可以预期在3000bps的数据传输的同时具有良好的语音质量。 还提供了在不尝试语音传输时自动切换到全带宽数据传输的进一步能力。

公开(公告)号：US4980897A

公开(公告)日：1990-12-25

申请号：US231868

申请日：1988-08-12

申请人： Dwight W. Decker ,  Gary A. Anwyl ,  Mark D. Dankberg ,  Mark J. Miller ,  Stephen R. Hart ,  Kristi A. Jaska

发明人： Dwight W. Decker ,  Gary A. Anwyl ,  Mark D. Dankberg ,  Mark J. Miller ,  Stephen R. Hart ,  Kristi A. Jaska

IPC分类号： H04L5/00 ,  H04L27/34

CPC分类号： H04L5/00 ,  H04L27/3427

摘要： A multi-channel trellis encoder/decoder is disclosed for use with multi-channel data transmission systems. For each data transmission symbol interval, trellis encoding is applied across all available channels, and for each data reception symbol interval trellis decoding is applied across all available channels. In comparision with systems employing independent trellis encoding along each available channel, the present invention reduces data throughput delays by roughly an order of magnitude, and reduces implementation complexity by roughly a factor equal to the number of transmission channels. Further, the multi-channel trellis encoder will permit different data transmission rates as well as permitting variations in signal power and/or noise power from channel to channel.

摘要翻译： 公开了一种与多通道数据传输系统一起使用的多通道网格编码器/解码器。 对于每个数据传输符号间隔，网格编码被应用在所有可用信道之间，并且对于每个数据接收符号间隔网格解码被应用于所有可用信道。 与沿着每个可用信道采用独立网格编码的系统相比，本发明将数据吞吐量延迟减少大约一个数量级，并且将实现复杂度降低大约等于传输信道数量的因子。 此外，多通道网格编码器将允许不同的数据传输速率以及允许从信道到信道的信号功率和/或噪声功率的变化。