Abstract: In a measurement device and a measurement method for determining output values by analyzing the frequency of cyclically changing detection data, such as pulse count, the output value indicating a peak in the analysis result is corrected using side lobe values that appear on both sides of said peak, and an output value having higher precision than the output value indicating the peak value is derived, such that a value closer to the original output value of the detection data can be obtained. Because the measurement device and measurement method according to the invention can improve the precision of the output value without increasing the sampling count, highly precise output values such as pulse counts can be obtained at high speeds without extending the data fetch time.

Abstract: An apparatus for detecting pulse waves and motion intensity of a living body in motion is disclosed. The apparatus has photosensors of the photo-coupler type for wavelengths of 660 nm and 940 nm, respectively. The sensors are attached to a person under examination, and provide output signals which include a blood pulse signal as well as body motion components superimposed on the blood pulse signal. These signals are subjected to the Fourier transformation in a fast Fourier transformation circuit, and then applied to a comparator which in turn compares amplitudes of major frequency components (components associated with pulse waves and body motion) to one another. According to the comparison result, a decision circuitdiscriminates the pulse wave from the body motion. A display unit displays the pulse rate corresponding to the fundamental frequency of the detected pulse wave. The display unit also displays the change in motion intensity detected by the decision circuit.

Abstract: In order to be able to accurately measure pitch both during running and walking, the invention focuses on the fact that the second harmonic of the body movement can be detected at a high level during running and that the third harmonic of the body movement can be detected at a high level during walking, and is designed to be able to calculate pitch regardless of whether or not the user is running or walking, by using a high-level line spectrum appearing in the area that is at or above 100 times/minute, for example, as the reference wave, and by determining whether this reference wave is the second or third harmonic. Whether the reference wave is the second or third harmonic can be determined based on whether or not a high-level signal is present near a frequency that is 1/3 or 2/3 of the frequency of the reference wave, for example; and pitch can be calculated by determining that the reference wave is the second harmonic if no high-level signal is present in the above frequency band.

Abstract: To provide FFT computing units, FFT computation devices, and pulse counters that can achieve computational precision using the smallest possible circuit size. FFT computing unit 602 comprises a data shift circuit for standardizing FFT computation target data to a specified bit width, adders/subtracters, multipliers, and data converters for standardizing the bit width to a certain bit width by truncating part of the output data of each computing unit, etc.

Abstract: A pulse rate counter that can accurately measure pulse rate regardless of whether the user is resting or exercising is disclosed. In the pulse rate counter, a pulse wave component extraction means extracts pulse wave components based on the frequency analysis results of a first calculation means and a second calculation means. During this process, an extraction method switching means determines whether the user is resting or exercising based on the amplitude level of the signal output of a body movement signal conversion means, the level (power) of the frequency spectrum of the output signal of the second calculation means, or the degree of variation in the level. If the user is determined to be resting, the extraction method switching means causes the pulse wave component extraction means to extract the pulse wave components based on the frequency analysis result of the first calculation means.

Abstract: The invention provides a wrist-worn pulse wave measuring device capable of outputting data measured by the wrist-worn pulse wave measuring device to an external data processing device without using a large device body. In the pulse information processing apparatus, a connector piece of a sensor unit is mounted to a connector of a wrist-worn pulse wave measuring device when measuring the pulse. A data transmission connector piece is mounted to the connector of the pulse wave measuring device when transmitting data with a data processor. Whether the operating mode is the pulse measurement mode or the data transmission mode is determined by a signal discriminator which discriminates the signal input from the connector of the pulse wave measuring device.

Abstract: A period and frequency measurement device is provided having a sensor for measuring pulse waves and body movements. A window determination circuit sets a reference value in accordance with previously measured pulse waves and body movements and determines whether currently measured pulse waves and body movements is within a window defined by upper and lower margins relative to the reference value. A window correction circuit corrects the window to be used for a next pulse waves and body movement measurement by applying a specified correction to the current pulse waves and body movements measurement if a determination result of the window determination circuit indicates that the current pulse waves and body movements measurement is outside a current window.

Abstract: A pulse rate monitor having an enhanced accuracy, reduced power consumption and reduced calculation time comprises a pulse wave extraction circuitry for extracting pulse wave frequency components from a power spectrum output of a pulse wave sensor and a movement sensor, and a pulse rate calculation circuit for calculating a pulse rate in accordance with the extracted pulse wave frequency components. A display device may be included to display the calculated pulse rate. In order to reduce power consumption, unnecessary circuitry may be deactivated and unnecessary operations may be avoided by use of a changing circuit which changes the method of calculation when movement of the user is not detected. Accordingly, when no movement has been detected for a predetermined period of time, the pulse rate may be calculated based upon a direct output of the pulse rate sensor, while the frequency analysis circuitry and calculation circuitry may remain deactivated.

Abstract: An electronic device, in a preferred embodiment an electronic watch, including a power generating device, a secondary power source for storing generated electric energy fed from the power generating device and serving as the power source for the electronic device, a first boosting circuit for stepping up the voltage of the secondary power source, a second boosting circuit, and a capacitor connected to the output of the first boosting circuit and charged through the output of the first boosting circuit, for stepping up the voltage of the capacitor. A voltage level converter converts a control signal based on the first boosting circuit output voltage to a control signal based on the second boosting circuit output to at least in part control the operation of the first boosting circuit. In this manner, the boosting circuits control the operation of the device such that when the voltage lever is low or the voltage level reaches a certain point the device does not shut down, but rather maintains normal operation.

Abstract: An electronic wristwatch including an a.c. generator having an output which is rectified using a half-wave rectifier. The half-wave rectified output of the generator is stored in a capacitor serving as a secondary power supply. Booster circuitry is operable for increasing and decreasing the voltage of the secondary power supply which is then applied across an auxiliary capacitor used for powering the wristwatch. Additional circuitry provides a suitable voltage across the auxiliary capacitor for driving the watch when the voltage across the secondary power supply is at or below a predetermined level. A pair of detecting circuits detect the maximum and minimum permissible voltage levels of the secondary power supply and auxiliary capacitor.

Abstract: A timepiece includes a hairspring for storing the energy provided by a step motor driving circuit and a rotor immersed in a viscous fluid controls the energy released by the hairspring to provide a constant driving force for turning the display hands of the timepiece. A frequency divider circuit counts the number of clock signals produced by an oscillator. During time correction when the hands are prevented from being driven by the energy stored in the hairspring the frequency divider retains at least a portion of the count. A recoil torque provided by the hairspring and a load torque provided by the rotor are substantially balanced at all times including immediately after the time correction activities. Time delay especially immediately following the time correction activities is avoided.

Abstract: A chargeable analog electronic timepiece chargeable by an external A.C. voltage source includes a step motor which includes a driving coil. A motor driving circuit coupled to both terminals of the coil receives the A.C. voltage and selectively applies a charge to the coil for either driving the motor or charging a chargeable battery. A charge control circuit controls a period in which the switching circuit charges the chargeable battery and drives the motor. A PN junction placed in parallel to the switching circuit rectifies the A.C. voltage during charging of the secondary battery so that a single motor coil may drive the watch hands as well as charge the battery and a diode of the switching circuit may be utilized as the rectifier.

Abstract: An apparatus for charging a power storage device provided within an electronic device. A power source provides direct current which is alternated in direction through a pair of primary coils for inducing alternating current in a secondary coil of the electronic device. The pair of primary coils are fixed to a coil yoke all of which are supported within a casing of the apparatus. During charging of the power storage device, the electronic device is mounted to the outside surface of the casing whereby substantially all of the magnetic flux of the magnetic field produced by the pair of primary coils flows through the secondary coil and coil yoke. The frequency of the oscillating signal is preset to provide the maximum induced current which will not adversely affect the movement of the analog mechanisms within the electronic device.