US 5,857,465 A · Biosignal display apparatus

Abstract

A variable accuracy biosignal detector includes a biosignal detector for detecting a biosignal such as a pulse wave from a living body and supplies the detected signal to a biosignal analog-to-digital converter. The analog-to-digital converter converts the biosignal to digital biosignal data values and stores the data in a memory. An input switch generates a start signal. In response to the start signal, a timing signal generating circuit generates a timing signal used as a sampling signal for driving the analog-to-digital converter and changes the sampling frequency of the analog-to-digital converter progressively on a time series basis. A biosignal calculating circuit performs frequency domain analysis when the number of stored digital biosignal data values reaches a predetermined value. By progressively reducing the sampling frequency of the analog-to-digital converter, measured results can be quickly displayed, while the accuracy of the displayed results is progressively increased.

Claims23

Dependent claims

A biosignal display apparatus comprising:

a biosignal detecting means having a sensor for detecting a biosignal and producing a corresponding output;
a biosignal converting means for converting the output from the biosignal detecting means into a digital biosignal;
a biosignal storing means for storing successively converted digital biosignal values;
a biosignal calculating means for analyzing the digital biosignal values in the frequency domain when the number of digital biosignal data values stored in the biosignal storing means has reached a predetermined number;
a display means for displaying the calculation results of the biosignal calculating means;
an input means for generating a start signal of a biosignal measurement in response to an external input operation;
a timing signal generating means for generating a timing signal in response to a basic clock signal;
and an operation frequency control means for progressively changing a sampling frequency of the biosignal converting means in a time series manner based on the start signal generated by the input means and the timing signal generated by the timing signal generating means.

5 more elements

A biosignal display apparatus comprising:

a biosignal detecting means having a sensor for detecting a biosignal and producing a corresponding output;
a biosignal converting means for converting the output from the biosignal detecting means into a digital biosignal;
a biosignal storing means for storing successively converted digital biosignal values;
a biosignal calculating means for analyzing the digital biosignal values in the frequency domain;
a display means for displaying the calculation results of the biosignal calculating means;
an input means for generating a start signal of a biosignal measurement in response to an external input operation;
an initializing means for initializing the digital biosignal values stored in the biosignal storing means in response to the start signal genera-ed by the input means;
a timing signal generating means for generating a timing signal in response to a basic clock signal an operation frequency setting means for setting a sampling frequency of the biosignal converting means based on the timing signal generated by the timing signal generating means;
and a calculation control means for progressively changing, in a time series manner, a number of digital biosignal values to be subjected to frequency-domain analysis in response to the start signal generated by the input means and the timing signal generated by the timing signal generating means.

6 more elements

Dependencies are inferred from the claim text.

Biosignal display apparatus

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Biosignal display apparatus

Life of this patent

Abstract

Claims23