Patent ID: 8588897

Claim:
A heartbeat detecting device to be applied to a cycle or a movable physical training implement with a handlebar, wherein the handlebar has a hollow handlebar tube and said hollow handlebar tube has opposite end portions with one handle provided at each of said opposite end portions, said heartbeat detecting device comprising: a reference electrode and an active electrode applicable to each of said handles; and a microprocessor, wherein the reference electrodes of both handles are electrically connected to each other with insulated electric wires, and said reference electrodes of both handles and each of said active electrodes provide an input signal to an amplifying section, wherein said insulated electric wires are located inside the hollow handlebar tube and are electrically isolated from the handlebar tube to transmit accurate and stable user's heart signals to the microprocessor through said amplifying section, wherein said amplifying section comprises, a pre-amplifier receiving said input signal and a pre-processing unit operatively coupled to the pre-amplifier and preconditioning the signal, said pre-amplifier and said pre-processing unit removing a low frequency biasing component from said input signal, an amplifier operatively connected to said pre-processing unit and configured to bring said input signal to a signal level compatible with downstream processing, a filtering unit operatively connected to said amplifier and configured to eliminate harmonic components disposed outside of a desired signal band, a digital converter, and said microprocessor receiving a converted signal from said digital converter and detecting an electric equivalent of a heartbeat, wherein said microprocessor comprises a program memory and a work memory, said program memory storing a set of instructions configured to provide a cardiac frequency measurement which comprises detecting a signal peak in a first measurement window, causing a silence period of duration shorter than a time between two earlier peaks, configured to prevent noise or artifacts from negatively affecting said cardiac frequency measurement, opening a second measurement window, measuring a subsequent heartbeat, and closing said second measurement window after measuring said subsequent heartbeat.