Hybrid filter bank analog/digital converter
First Claim
1. A system for converting a signal between continuous-time and discrete-time comprising:
- an analysis filter bank for partitioning a wideband input signal into first subband signals;
a converter bank of analog/digital converters for converting the first subband signals to second subband signals;
a synthesis filter bank for reconstructing the second subband signals such that third subband signals are generated which are the converted approximation of the first subband signals; and
wherein one of the analysis bank and synthesis bank comprises continuous-time filters and the other comprises discrete-time filters.
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Abstract
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.
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Citations
49 Claims
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1. A system for converting a signal between continuous-time and discrete-time comprising:
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an analysis filter bank for partitioning a wideband input signal into first subband signals; a converter bank of analog/digital converters for converting the first subband signals to second subband signals; a synthesis filter bank for reconstructing the second subband signals such that third subband signals are generated which are the converted approximation of the first subband signals; and wherein one of the analysis bank and synthesis bank comprises continuous-time filters and the other comprises discrete-time filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for converting a continuous-time signal to a discrete-time signal comprising:
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a bank of continuous-time analysis filters for partitioning a continuous-time wideband input signal into subband signals; a bank of analog-to-digital converters for quantizing the subband signals; a bank of rate changers for adjusting the data rate of the subband signals; and a bank of discrete-time synthesis filters for reconstructing the subband signals such that signals are generated which are the discrete-time approximation of the continuous-time subband signals. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for converting a signal between continuous-time and discrete-time comprising:
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partitioning a wideband input signal into first subband signals at an analysis filter bank; converting the first subband signals to second subband signals at a bank of analog/digital converters; and reconstructing the second subband signals at a synthesis filter bank such that third subband signals are generated which are the converted approximation of the first subband signals and wherein one of the analysis bank and synthesis bank comprises continuous-time filters and the other comprises discrete-time filters. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for converting a continuous-time signal to a discrete-time signal comprising the steps of:
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partitioning a continuous-time wideband input signal into subband signals at a bank of continuous-time analysis filters; quantizing the subband signals at a bank of analog-to-digital converters; adjusting the data rate of the subband signals at a bank of rate changers; and reconstructing the subband signals at a bank of discrete-time synthesis filters for generating signals which are the discrete-time approximation of the continuous-time subband signals. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. In a data processing system, a method of generating a system for converting a signal between discrete-time and continuous-time comprising:
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estimating a bank of continuous-time filters; implementing the bank of continuous-time filters; measuring the behavior of the continuous-time filter bank implementation; estimating a bank of discrete-time filters to compensate for non-ideal behavior in the continuous-time filter bank implementation; and adjusting the discrete-time filters such that the system distortion function converges on a perfect delay and such that the system aliasing function converges on zero. - View Dependent Claims (49)
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Specification