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    • 1. 发明授权
    • Method for establishing and maintaining synchronization between
communicating multiplexers using checksum values
    • 使用校验和值建立和维持通信多路复用器之间的同步的方法
    • US4729123A
    • 1988-03-01
    • US896259
    • 1986-08-14
    • Andrew J. T. Wheen
    • Andrew J. T. Wheen
    • H04L7/04H04J3/06
    • H04L7/048
    • Methods for establishing and maintaining synchronization between communicating multiplexers are provided, wherein a first multiplexer having a frame format multiplexes at least data according to the frame format, and wherein the second multiplexer demultiplexes at least said data according to the frame format, and synchronization is established by: providing the frame format with bit positions for a plurality of bits including first predetermined bit positions for a plurality of checksum bits, and second predetermined bit positions for bits other than checksum bits; calculating a checksum for the bit values of bits located at said second predetermined bit positions, and inserting bits representing the said calculated checksum into said first predetermined bit positions; sending bits including bits located at said first and second predetermined bit positions in said frame format from said first multiplexer to said second multiplexer; and establishing synchronization between said first and second multiplexers by using said bits representing said calculated checksum.In establishing synchronization, the second multiplexer chooses an arbitrary bit as the first bit in the frame. Received bits located at distances from the first bit which are equivalent to the second predetermined bit positions are then used to calculate a checksum. Bits are then located at distances from the first bit which are equivalent to the predetermined first positions. If the checksum calculations do not correspond to the found checksum bits, frame synchronization is not established. The process is then repeated starting with the next bit after the arbitrary point, and continued until the calculated checksum agrees with the bits at the checksum locations.
    • 提供了用于建立和维持通信多路复用器之间的同步的方法,其中具有帧格式的第一多路复用器至少根据帧格式复用数据,并且其中第二多路复用器至少根据帧格式解复用所述数据,并且建立同步 通过:为包括用于多个校验和位的第一预定位位置的多个位的位位置提供帧格式,以及用于除校验和位之外的位的第二预定位位置; 计算位于所述第二预定位位置的位的位值的校验和,并将表示所述计算的校验和的位插入所述第一预定位位置; 将位于位于所述帧格式的所述第一和第二预定位位置的位从所述第一多路复用器发送到所述第二多路复用器; 以及通过使用表示所述计算的校验和的所述比特来在所述第一和第二多路复用器之间建立同步。 在建立同步时,第二多路复用器选择任意位作为帧中的第一位。 然后使用位于距离第一位的距离等于第二预定位位置的接收位来计算校验和。 然后位置与第一位的距离相等于预定的第一位置。 如果校验和计算不对应于找到的校验和位,则不会建立帧同步。 然后,该过程从任意点之后的下一个比特开始重复,并且一直持续到计算的校验和与校验和位置处的位一致。
    • 2. 发明授权
    • Echo canceller
    • 回音消除器
    • US4757527A
    • 1988-07-12
    • US772571
    • 1985-09-04
    • Graham BenistonNigel P. DyerAndrew J. T. Wheen
    • Graham BenistonNigel P. DyerAndrew J. T. Wheen
    • H04B3/23
    • H04B3/237H04B3/234
    • A digital adaptive echo canceller for use in cancelling echo signals caused by trans-hybrid losses in two-wire to four-wire converters comprises first and second adaptive filters (20,22) each arranged to generate synthetic echo signals. Transfer control logic (23) compares difference signals relative to the difference between the synthetic echo signal generated by the first filter (22), and a real echo signal and the synthetic echo signal generated by the second filter (20) and the real echo signal, and if the synthetic echo signal from the first filter (22) is closer to the real echo signal causes transfer of the coefficients of the first filter (22) to the second filter (20) such that the synthetic signal mixed with transmitted speech signals in a mixer (24) is updated when necessary.
    • 用于消除由双线至四线转换器中的混合丢失引起的回波信号的数字自适应回波消除器包括分别被布置成产生合成回波信号的第一和第二自适应滤波器(20,22)。 传输控制逻辑(23)将差分信号相对于由第一滤波器(22)产生的合成回波信号与实际回波信号和由第二滤波器(20)产生的合成回波信号之间的差和真实回波信号 ,并且如果来自第一滤波器(22)的合成回波信号更靠近真实回波信号,则将第一滤波器(22)的系数传送到第二滤波器(20),使得与发送的语音信号混合的合成信号 在混合器(24)中必要时进行更新。