公开(公告)号：US5568142A

公开(公告)日：1996-10-22

申请号：US326474

申请日：1994-10-20

申请人： Scott R. Velazquez ,  Truong O. Nguyen ,  Steven R. Broadstone

发明人： Scott R. Velazquez ,  Truong O. Nguyen ,  Steven R. Broadstone

IPC分类号： G10L11/00 ,  H03H17/02 ,  H03M1/08 ,  H03M1/12 ,  H03M1/00

CPC分类号： H03M1/121 ,  H03H17/0266

摘要： A hybrid filter bank analog-to-digital converter includes continuous-time analysis filters and discrete-time synthesis filters. The continuous-time analysis filters partition a continuous-time wideband input signal into continuous-time subband signals. An analog-to-digital converter bank quantizes the subband signals at a low data rate. A bank of upsamplers increases the data rate of the quantized subband signals. A bank of discrete-time synthesis filters processes the upsampled subband signals, generating signals which are the discrete-time approximation of the continuous-time subband signals. The subband signals may be recombined into a discrete-time wideband signal which is the discrete-time approximation of the continuous-time wideband input signal. The linearity errors, analog-to-digital converter mismatches and quantization noise are not compounded between the frequency bands, thereby increasing resolution. The system may also include compensators for compensating for non-linear behavior in the analog-to-digital converters and may include application-specific processors for further processing of the compensated subband signals. An alternative embodiment employs discrete-time analysis filters and continuous-time synthesis filters for digital-to-analog conversion.

摘要翻译： 混合滤波器组模数转换器包括连续时间分析滤波器和离散时间合成滤波器。 连续时间分析滤波器将连续时间宽带输入信号划分为连续时间子带信号。 模数转换器组以低数据速率量化子带信号。 一组上采样器增加量化子带信号的数据速率。 离散时间合成滤波器组处理上采样的子带信号，产生作为连续时间子带信号的离散时间近似的信号。 子带信号可以被重新组合成离散时间宽带信号，其是连续时间宽带输入信号的离散时间近似。 线性误差，模数转换器不匹配和量化噪声不会在频带之间复合，从而提高分辨率。 该系统还可以包括用于补偿模数转换器中的非线性行为的补偿器，并且可以包括用于进一步处理补偿的子带信号的应用专用处理器。 替代实施例采用离散时间分析滤波器和用于数模转换的连续时间合成滤波器。