A period and frequency measurement device

摘要

To provide a cycle and frequency measurement device that can perform appropriate window determination by making the window follow the changes even when pulse rate or pitch changes greatly. Means of solving the problem In a device for measuring pulse rate, first, the upper margin of the window for the measurement result is set 20% larger than the previous measurement value and the lower margin is set 20% smaller than the previous measurement value. Subsequently, when body movements become larger, for the following 4 seconds, the upper margin is widened by 80% from the previous measurement value and the lower margin is narrowed by 10%. From then on, the upper margin is narrowed to +60%, +40%, and +20%. Note that if body movements become smaller, the upper margin is widened by 10% from the previous measurement value while the lower margin is set at -60% of the previous measurement value. <IMAGE>