Signal processing apparatus for an ultrasound transducer, ultrasound receiver and method for operating an ultrasound receiver
First Claim
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1. A signal processing apparatus for an ultrasound transducer, comprising:
- a first preamplifier for amplifying an analog signal produced by an ultrasound transducer to generate an amplified analog signal;
a first analog-to-digital converter directly connected to the preamplifier for producing a sequence of first digital signals from the amplified analog signal; and
a median filter for filtering the sequence of first digital signals, each of said first digital signals having a respective row of values in which each subsequent value in the row represents the value of the signal at the next sampling point of m sampling points that are recorded in a sampling window for each first digital signal, said first analog-to-digital converter being connected to a first median filter for filtering the sequence of first digital signals recorded in n sampling windows to produce a sequence of first filtered digital signals, said median filter being adapted to transfer a sequence of n rows having m values in each row to respective columns in an input matrix, sort the values in each row of the input matrix by size and output the value in each respective row that has the median size in the respective row of the input matrix to a result array, the values output to the result array providing a first median digital signal used to produce an output signal for the ultrasound transducer.
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Abstract
To reduce signal interference and improve the signal-to-noise ratio in the transmitted signal, the analog signals produced by an ultrasound transducer are promptly digitized. In accordance with the invention, the demodulator is already shielded from the ultrasound transducers, immediately after the preamplifier, which is itself shielded from the ultrasound transducers, by an analog to digital converter, for example.
14 Citations
30 Claims
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1. A signal processing apparatus for an ultrasound transducer, comprising:
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a first preamplifier for amplifying an analog signal produced by an ultrasound transducer to generate an amplified analog signal; a first analog-to-digital converter directly connected to the preamplifier for producing a sequence of first digital signals from the amplified analog signal; and a median filter for filtering the sequence of first digital signals, each of said first digital signals having a respective row of values in which each subsequent value in the row represents the value of the signal at the next sampling point of m sampling points that are recorded in a sampling window for each first digital signal, said first analog-to-digital converter being connected to a first median filter for filtering the sequence of first digital signals recorded in n sampling windows to produce a sequence of first filtered digital signals, said median filter being adapted to transfer a sequence of n rows having m values in each row to respective columns in an input matrix, sort the values in each row of the input matrix by size and output the value in each respective row that has the median size in the respective row of the input matrix to a result array, the values output to the result array providing a first median digital signal used to produce an output signal for the ultrasound transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A signal processing apparatus for an ultrasound transducer, comprising:
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a first analog-to-digital converter directly connected to the ultrasound transducer for producing a sequence of first digital signals from a sequence of first analog signals produced by the ultrasound transducer; and a demodulator for producing a sequence of demodulated digital signals from the sequence of first digital signals, said demodulator being spatially separated from said first analog-to-digital converter, wherein the demodulator includes an NOC, an I/Q mixer and CIC filter, and an FIR filter and a Cartesian-to-polar coordinate converter. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A signal processing method, comprising the steps of:
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producing a sequence of analog signals from an ultrasound transducer; amplifying in the sequence of analog signals in a preamplifier to a sequence of amplified analog signals; providing the sequence of amplified analog signals to an analog-to-digital converter directly connected to the preamplifier to produce a sequence of first digital signals from the sequence of amplified analog signals wherein each of said first digital signals in the sequence of first digital signals has a respective row of values in which each subsequent value in the row represents the value of the respective first digital signal at the next sampling point of m sampling points that are recorded in a sampling window, providing the rows of values for the sequence of first digital signals to a median filter for filtering the sequence of first digital signals recorded in n sampling windows to produce a sequence of first filtered digital signals; transferring a sequence of n rows having m values in each row to an respective columns in an input matrix; sorting the values in each row of the input matrix by size; providing the value that has the median size in each row of the input matrix to a result array; and using the values in the result array to produce a first output digital signal for the ultrasound transducer. - View Dependent Claims (28, 29, 30)
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Specification