System for sampling a data signal
AssigneeSiemens Medical Systems, Inc.
InventorsClifford Mark Kelly, Marc Auerbach, Jonathan Fitch
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Abstract
A sampling system includes an input terminal for receiving a data signal having a signal component and possibly a noise component. A sampler samples the data signal at a sample rate set in responsive to a control signal. A noise detector detects the presence of a noise component, and if a noise component is detected, generates the control signal conditioning the sampler to sample the data signal at a first sample rate satisfying the Nyquist criterion for the data signal including the noise component, and otherwise generating the control signal conditioning the sampler to sample the data signal at a second data rate satisfying the Nyquist criterion for the data signal including only the signal component.
Claims21
A system for sampling a data signal, comprising:
- an input terminal for receiving a data signal having a signal component and possibly a noise component;
- a sampler, coupled to the input terminal, for sampling the data signal at a sample rate set in response to a control signal;
- and
- a noise detector, coupled to the sampler, for detecting a noise component, and if a noise component is detected generating the control signal conditioning the sampler to sample the data signal at a first sample rate satisfying the Nyquist criterion for the data signal including the noise component, and otherwise generating the control signal conditioning the sampler to sample the data signal at a second data rate, satisfying the Nyquist criterion for the data signal including the signal component only wherein the second sample rate is a fixed sample rate greater than or equal to substantially twice the highest frequency of the signal component.
A method for sampling a data signal having a signal component and possibly a noise component, comprising the steps of:
- sampling the data signal at a controllable sampling rate;
- detecting the presence of a noise component in the data signal;
- if a noise component is detected in the data signal, then controlling the sampling rate to a first rate which satisfies the Nyquist criterion for the data signal including the noise component, otherwise controlling the sampling rate to a second rate which satisfies the Nyquist criterion for the data signal including only the signal component.
A system for sampling a data signal, comprising:
- an input terminal for receiving a data signal having a signal component and a noise component;
- a sampler, coupled to the input terminal, for sampling the data signal at a sample rate set in response to a control signal;
- and
- a noise detector, coupled to the sampler, for detecting a noise component, and providing said control signal for adaptively adjusting a sampling rate of the system, wherein if a noise component of at least a threshold frequency is detected causing said system to operate at a first power level associated with a first sampling rate and otherwise causing said system to operate at a second power level associated with a second sampling rate, said second power level being substantially less than said first power level.
Dependencies are inferred from the claim text.