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Continuous-time digital signal generation, transmission, storage and processing
| Details |
Inventors: Tsividis, Yannis;
Assignee: The Trustees of Columbia University in the City of New York (New York, NY)
Primary Examiner: Barnie; Rexford
Assistant Examiner: Nguyen; Khai M.
Attorney, Agent or Firm: Wilmer Cutler Pickering Hale and Dorr LLP
A method of digitally processing an analog signal in continuous time includes producing a continuous-time digital signal from an analog signal via a technique that does not include periodic sampling, then producing one or more delayed versions of the continuous-time digital signal. Each delayed version is delayed by nT, where n is an integer greater than zero, and T is a delay interval. The method further includes multiplying the continuous-time digital signal and each of the delayed versions by one or more associated coefficients, so as to produce a set of products, then adding the set of products, so as to produce a sum value corresponding to the analog signal processed by a transfer function defined by the associated coefficients. The individual bit paths of the continuous-time digital signal are multiplied by the coefficients, and the resulting products are combined by a binary-weighted adder. |
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DETAILED DESCRIPTION Digitally processing an analog signal that has been quantized without sampling results in no aliasing and reduces in-band quantization error as compared to conventional digital processing techniques.
The following description sets forth a continuous-time digital system that quantizes an analog signal without sampling and processes an input signal with substantially the same transfer function as a classical analog transmission line filter.
In one aspect, an apparatus for generating a continuous-time quantized and digitized signal from a continuous-time analog signal includes one or more comparators for comparing the continuous-time analog signal to a set of reference signals, and producing an intermediate signal that represents the reference signal to which the analog signal is nearest in amplitude.
The apparatus also includes an encoder for producing a continuous-time digital word that represents the intermediate signal.
The apparatus may include a recorder for recording the digital word on a continuous-time storage medium.
The recorder may also record timing information related to when the digital word changes from one value to another value.
In another aspect, a method of generating a continuous-time quantized and digitized signal from a continuous-time analog signal includes comparing the continuous-time analog signal to a set of reference signals, and producing an intermediate signal that represents the reference signal to which the analog signal is nearest in amplitude.
The method further includes producing a continuous-time digital word that represents the intermediate signal.
The method may include recording the continuous-time digital word on a continuous-time storage medium, and the recorder may record timing information related to when the digital word changes from one value to another value.
In another aspect, a method of generating a continuous-time quantized and digitized signal from a continuous-time analog signal includes producing a sequence of discrete signals corresponding to the analog signal
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