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1. 发明授权

US5651030A Receiver with signal classifier 失效
标题翻译：接收机带信号分类器
公开(公告)号：US5651030A
公开(公告)日：1997-07-22
申请号：US696466
申请日：1991-05-06
申请人： Chin-Pan Wong , Richard S. Young
发明人： Chin-Pan Wong , Richard S. Young
IPC分类号： H04L29/06 , H04B1/66 , H04L27/00 , H04L27/14 , H04L27/06
CPC分类号： H04B1/66
摘要： Briefly, according to the invention, a receiver (100) for receiving and decoding a carder signal is described. A carrier signal is modulated with an information signal which has one of a plurality of formats. The receiver includes a circuit (104) for receiving and demodulating the carrier signal to produce a demodulated signal. The receiver (100) also includes a digital signal processing subsystem (108) for calculating the correlation function of the demodulated signal and based on this correlation function classifies the format of the demodulated signal. A decoder (118) is further included in the receiver (100) to decode the demodulated signal once it has been classified.
摘要翻译：简而言之，根据本发明，描述了用于接收和解码卡片信号的接收机（100）。用具有多种格式之一的信息信号调制载波信号。接收机包括用于接收和解调载波信号以产生解调信号的电路（104）。接收器（100）还包括用于计算解调信号的相关函数的数字信号处理子系统（108），并且基于该相关函数对解调信号的格式进行分类。解码器（118）还包括在接收机（100）中，以便一旦被分类就对解调信号进行解码。

2. 发明授权

US4748626A Viterbi decoder with reduced number of data move operations 失效
标题翻译：维特比解码器具有减少数据移动操作的数量
公开(公告)号：US4748626A
公开(公告)日：1988-05-31
申请号：US7860
申请日：1987-01-28
申请人： Chin-Pan Wong
发明人： Chin-Pan Wong
IPC分类号： G06F11/10 , H03M13/00 , H03M13/23 , H03M13/41 , H04L27/34 , H04L1/00
CPC分类号： H03M13/41 , H03M13/00 , H04L27/3438
摘要： Disclosed is a modem including a transmitter having a convolutional encoder for transforming each time unit digital data into an expanded bit sequence having symbol-selecting bits and subset-selecting bits, the transmitter further providing modulation of a carrier signal and a receiver wherein a Viterbi decoder determines the maximum likelihood path through a trellis from a plurality of surviving paths using a wraparound memory wherein in each addressable location indexed to a current state of a surviving path there is stored a previous state of that surviving path.
摘要翻译：公开了一种调制解调器，包括具有卷积编码器的发射机，用于将每个时间单位数字数据变换为具有符号选择位和子集选择位的扩展位序列，发射机还提供载波信号的调制和接收机，其中维特比解码器使用环绕存储器确定来自多个幸存路径的网格的最大似然路径，其中在索引到幸存路径的当前状态的每个可寻址位置中存储该幸存路径的先前状态。

3. 发明授权

US4891806A Constellation multiplexed inband secondary channel for voiceband modem 失效
标题翻译：用于语音频带调制解调器的星座多路复用带内辅助信道
公开(公告)号：US4891806A
公开(公告)日：1990-01-02
申请号：US98547
申请日：1987-09-18
申请人： Luis V. Farias , Vadavalli G. Krishnan , Chin-Pan Wong
发明人： Luis V. Farias , Vadavalli G. Krishnan , Chin-Pan Wong
IPC分类号： H04B17/00 , H04L1/20 , H04L27/34
CPC分类号： H04L27/3477 , H04L1/20 , H04L27/3472
摘要： A method of providing an inband secondary channel for a data modem includes encoding the main channel data using a convolutional encoder so that main channel data symbols are selected from a first constellation. The secondary channel data are encoded using a differential encoder and secondary channel data symbols are selected from a second constellation. The transmission of the main channel symbols takes place during 48 frames of a 49 frame master frame. The differentially encoded secondary channel data symbols are transmitted during the remaining frame. The symbols of the secondary channel constellation are selected to have a higher average energy than those of the main channel data so that the secondary channel is easily detected and may be used to obtain frame synchronization for the modem after brief dropouts without having to retrain the modem.
摘要翻译：为数据调制解调器提供带内二次信道的方法包括使用卷积编码器对主信道数据进行编码，以便从第一星座选择主信道数据符号。使用差分编码器对次要信道数据进行编码，并且从第二星座选择次要信道数据符号。主通道符号的传输在49帧主帧的48帧期间进行。在剩余帧期间发送差分编码的辅助信道数据符号。选择次级信道星座的符号具有比主信道数据更高的平均能量，使得辅助信道容易被检测，并且可以用于在短暂丢失之后获得调制解调器的帧同步，而不必重新调制调制解调器。

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