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    • 9. 发明申请
    • MULTICHANNEL TIME ENCODING AND DECODING OF A SIGNAL
    • 多信道时间编码和解码信号
    • WO2004112298A3
    • 2005-09-15
    • PCT/US2004016957
    • 2004-05-27
    • UNIV COLUMBIALAZAR AURAL A
    • LAZAR AURAL A
    • H03M1/12H03M3/02H04L20060101
    • H03M1/121H03M1/125H03M1/50H03M1/662H03M1/82H03M3/432H03M3/468H03M3/504
    • Analog signals can be fully encoded as an asynchronous time sequence generated by a time encoding machine. With knowledge of the parameters of the time encoding machine, the asynchronous time sequence can be decoded using a non-linear time decoding machine. Such a system can be extended into an encoder/decoder in which a signal is processed in M separate channels. An input signal is applied to the encoder where the signal is provided to an M channel encoder circuit including a filter bank having a total bandwidth partitioned among M adjacent or overlapping filters. Each of the M filters are coupled to a corresponding one of M time encoding machines. The encoder output is represented by M sets of time encoded trigger values. The input signal can be recovered from the M sets of time encoded trigger values by applying the trigger signals to a corresponding M channel decoder which includes M TDMs and filters. The TDMs recover the continuous signal from each channel. The filter outputs xm are then amplitude scaled sm and are combined to recover the input signal. By partitioning the signal bandwidth into M channels, the average pulse rate from each TDM is substantially reduced.
    • 模拟信号可以被完全编码为由时间编码机产生的异步时间序列。 利用时间编码机的参数知识,可以使用非线性时间解码机对异步时序进行解码。 这样的系统可以扩展到编码器/解码器,其中在M个独立的信道中处理信号。 输入信号被施加到编码器,其中信号被提供给M通道编码器电路,该M通道编码器电路包括具有在M个相邻或重叠滤波器之间划分的总带宽的滤波器组。 M个滤波器中的每一个耦合到M个时间编码机中相应的一个。 编码器输出由M组时间编码的触发值表示。 可以通过将触发信号施加到包括M个TDM和滤波器的相应M信道解码器,从M组的时间编码触发值中恢复输入信号。 TDM从每个通道恢复连续信号。 滤波器输出xm然后是幅度缩放的sm并被组合以恢复输入信号。 通过将信号带宽划分为M个信道,来自每个TDM的平均脉冲速率显着降低。
    • 10. 发明申请
    • METHOD AND APPARATUS FOR ANALOG-TO-DIGITAL CONVERSION
    • 用于模拟数字转换的方法和装置
    • WO2002091581A2
    • 2002-11-14
    • PCT/US2002/010351
    • 2002-04-02
    • HRL LABORATORIES, LLCYAP, DanielWALDEN, Robert, H.
    • YAP, DanielWALDEN, Robert, H.
    • H03M1/00
    • H03M3/496H03M3/468
    • A photonically sampled analog-to-digital converter using parallel channels of sampling and quantizing. The parallel combination achieves cancellation of the spurs that result from the nonlinear transfer function of the samplers. The samplers feed a dual-detector optoelectronic receiver that has differential inputs for suppression of laser intensity noise. The outputs of the multiple photonic samplers are averaged to reduce the effects of shot or thermal noise from the optoelectronic receiver of a sampler. The errors produced by the quantization process can be reduced by using a delta-sigma modulater-based analog-to-digital convertor as the quantizer which provides noise-spectrum shaping and filtering.
    • 采用并行通道采样和量化的光子采样模数转换器。 并行组合实现了取样器的非线性传递函数所产生的杂散的消除。 采样器馈送双检测器光电接收器,其具有用于抑制激光强度噪声的差分输入。 对多个光子采样器的输出进行平均,以减少来自采样器的光电接收器的射击或热噪声的影响。 通过使用基于Δ-Σ模块的模数转换器作为提供噪声频谱整形和滤波的量化器,可以减少量化处理产生的误差。