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’753專利請求項1之原文為:A heart rate monitor for use by a user in association with exercise apparatus and/or exercise procedures, comprising:
an elongate member;
electronic circuitry including a difference amplifier having a first input terminal of a first
polarity and a second input terminal of a second polarity opposite to said first polarity;
said elongate member comprising a first half and a second half;
a first live electrode and a first common electrode mounted on said first half in spaced
relationship with each other;
a second live electrode and a second common electrode mounted on said second half in spaced
relationship with each other;
said first and second common electrodes being connected to each other and to a point of
common potential;
said first live electrode being connected to said first terminal of said difference amplifier and said second live electrode being connected to said second terminal of said difference amplifier;
a display device disposed on said elongate member;
wherein, said elongate member is held by said user with one hand of the user on said first half
contacting said first live electrode and said first common electrode, and with the other hand of the user on said second half contacting said second live electrode and said second common electrode;
whereby, a first electromyogram signal will be detected between said first live electrode and
said first common electrode, and a second electromyogram signal, of substantially equal
magnitude and phase to said first electromyogram signal will be detected between said
second live electrode and said second common electrode;
so that, when said first electromyogram signal is applied to said first terminal and said second
electromyogram signal is applied to said second terminal, the first and second
electromyogram signals will be subtracted from each other to produce a substantially zero
electromyogram signal at the output of said difference amplifier;
and whereby a first electrocardiograph signal will be detected between said first live electrode
and said first common electrode and a second electrocardiograph signal, of substantially
equal magnitude but of opposite phase to said first electrocardiograph signal will be
detected between said second live electrode and said second common electrode;
so that, when said first electrocardiograph signal is applied to said first terminal and said
second electrocardiograph signal is applied to said second terminal, the first and second
electrocardiograph signals will be added to each other to produce a non-zero
electrocardiograph signal at the output of said difference amplifier;
means for measuring time intervals between heart pulses on detected electrocardiograph signal;
means for calculating the heart rate of said user using said measure time intervals;
said means for calculating being connected to said display device;
whereby, the heart rate of said user is displayed on said display device.
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