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    • 31. 发明授权
    • Data modems with automatic equalization, drop-out detection and data
echo protection
    • 具有自动均衡,退出检测和数据回波保护的数据调制解调器
    • US4044307A
    • 1977-08-23
    • US700903
    • 1976-06-29
    • Richard BorysiewiczCharles W. Roedel
    • Richard BorysiewiczCharles W. Roedel
    • H04L25/03H04M11/00
    • H04L25/03133H04L2025/03662
    • Disclosed is an automatic data communication system having communicating modems equipped with automatic equalizers. The equalizers respond to a first long equalization sequence automatically transmitted from another modem. In response to that long equalization sequence, the equalizer starts from a preset non-equalized condition and assumes a fully equalized condition. That equalized modem is also capable of automatically transmitting its own long equalization sequence to the other modem. Thereafter, second short equalization sequences are employed at the receiving modems to enable a memory storage associated with the automatic equalizers. The memory stores, in response to the long equalization sequence, signals which are indicative of the fully equalized condition. Accordingly, the equalizers do not have to start from a non-equalized condition for each new data message unless a dramatic distortion occurs. If such distortion does occur, it is automatically detected and long equalization sequences are again employed to fully re-equalize. The disclosed modems have detection means for automatically distinguishing between equalization sequences, line drop-outs, and data echoes.
    • 公开了具有配备有自动均衡器的通信调制解调器的自动数据通信系统。 均衡器响应从另一个调制解调器自动发送的第一个长均衡序列。 响应于该长均衡序列,均衡器从预设的非均衡条件开始并且采取完全均衡的条件。 该均衡调制解调器还能够自动将其自己的长均衡序列发送到另一个调制解调器。 此后,在接收调制解调器处采用第二短均衡序列,以实现与自动均衡器相关联的存储器存储。 存储器响应于长均衡序列存储指示完全均衡的条件的信号。 因此,除非发生剧烈的失真,否则均衡器不必从每个新数据消息的非均衡条件开始。 如果发生这种失真,则自动检测并且再次使用长均衡序列来完全重新均衡。 所公开的调制解调器具有用于自动区分均衡序列,线路丢失和数据回波的检测手段。
    • 33. 发明申请
    • DATA PROCESSING DEVICE
    • 数据处理设备
    • WO99059336A1
    • 1999-11-18
    • PCT/EP1999/002878
    • 1999-04-28
    • H04N5/14H03H21/00H03L7/099H04B3/06H04L7/033H04L7/04H04L25/03H04L25/06H04N7/025H04N7/03H04N7/035
    • H04L25/03038H03H21/0012H03L7/0994H04L7/0331H04L7/046H04L25/062H04L2025/03375H04L2025/03477H04L2025/03617H04L2025/03662H04N7/035
    • The invention relates to a data processing device for recovering digital data which is received in an analogue transmitted signal. According to the invention, the received signal is digitized and a threshold is determined in a threshold estimator (LVEST). The interference in the channel is corrected in a downstream adaptive equalizer (ADEQ), and a bit clock generator (DPLL) produces the correct sampling rate and phase for the data of a line. The threshold estimator is used to determine the mean value of an input signal for each line, and this value is then taken as the optimum decision value for sampling the data bits for this line. By using an adaptive equaliser, it is possible to correct different types of distortion, caused by the transmission channel, without the need for a training signal. The data processing device according to the invention can thus be used universally for all digital additional signals occuring in a television signal, for example.
    • 本发明涉及一种用于恢复以模拟发送信号接收的数字数据的数据处理装置。 根据本发明,接收的信号被数字化,并且在阈值估计器(LVEST)中确定阈值。 信道中的干扰在下行自适应均衡器(ADEQ)中被校正,并且位时钟发生器(DPLL)产生线的数据的正确采样速率和相位。 阈值估计器用于确定每行的输入信号的平均值,然后将该值作为对该行的数据位进行采样的最佳判定值。 通过使用自适应均衡器,可以校正由传输信道引起的不同类型的失真,而不需要训练信号。 因此,根据本发明的数据处理装置可以被普遍地用于例如在电视信号中发生的所有数字附加信号。