Abstract: A step platform for slow step exercises is provided and has a basic structural block which is formed as a solid block made of a lightweight styrene foam material and includes a plurality of first concave portions formed in a bottom surface of styrene foam by using a plurality of first hollow holes formed in a predetermined shape which includes a penetrating hole perpendicularly penetrating the styrene foam from the bottom surface toward the upper surface or which includes a non-penetrating portion formed inside the penetrating hole; and predetermined single or plural step plates for distributing a load and ensuring a load bearing performance, bonded or adhered to the upper surface of the basic structural block.

Abstract: A step platform for slow step exercises is provided and has a basic structural block which is formed as a solid block made of a lightweight styrene foam material and includes a plurality of first concave portions formed in a bottom surface of styrene foam by using a plurality of first hollow holes formed in a predetermined shape which includes a penetrating hole perpendicularly penetrating the styrene foam from the bottom surface toward the upper surface or which includes a non-penetrating portion formed inside the penetrating hole; and predetermined single or plural step plates for distributing a load and ensuring a load bearing performance, bonded or adhered to the upper surface of the basic structural block.

Abstract: A method for establishing inter-base-station synchronization among a plurality of radio base stations of a mobile radio communication system. Each radio base station transmits a radio frequency control signal including priority information identifying the priority of the transmitting station as it relates to establishing synchronization, and synchronization establishing information indicating whether synchronization has been previously established between the transmitting base station and any other radio base station.

Abstract: A method and an apparatus for determining a position of a movable object comprise transmission of a radio wave of a constant frequency from the mobile object. The transmitted radio wave is received at each of a plurality of spaced positions which are disposed in an area where the mobile object is movable. A frequency of the received radio wave is detected at each of these positions and the position of the mobile object is determined based on position data indicating the spaced positions and a frequency deviation between the frequency of the received radio wave detected at each of the positions and the constant frequency. Further, in a mobile communication system a radio wave of a constant frequency, which is transmitted from the mobile object, is received at each of a plurality of spaced base stations which are disposed in an area where the mobile object is movable.

Abstract: In an amplifier including an AC amplifier, its operation level shifts according to input waveforms. When a positive input signal is, for example, inputted, the circuit feeds out a synthesized signal to the amplifier in which signal a positive and negative portions are symmetry and have a time difference. The circuit compensates an operating level of the amplifier so that it amplifies a small signal to keep always a zero level of the signal being constant in spite of various signal waveforms and amplitudes whereby a linearity of the amplifier is improved and fluctuations of a dynamic range thereof are eliminated.

Abstract: In an amplifier including an AC amplifier, its operation level shifts according to input waveforms. This invention describes a circuit to eliminate the level shift. An output of the AC amplifier is fed to a level shift detector, wherein the level shift is detected to provide an error signal to a pulse width modulation circuit. In this circuit, a pulse of a pulse width corresponding with the level shift is generated and fed to a preamplifier, wherein the input waveform and the pulse are synthesized to be fed back to the AC amplifier. This feed back loop clamps a zero level of the input waveforms.

Abstract: A system suitable for the amplification of wide-band signals, with frequencies from zero to the gigahertz order, for oscilloscopic observation or recording. Included are first and second amplifier circuits. The first amplifier circuit, typically of multistage configuration, has two inputs, one for the reception of a wide-band signal to be amplified and the other for the reception of a low-band signal, and puts out an amplified wide-band signal in response to the wide- and low-band input signals. Comprising an operational amplifier, the second amplifier circuit also has two inputs for the reception of the low-frequency components of the wide-band input and output signals of the first amplifier circuit and, in response to these inputs, produces the low-band signal for delivery to the mentioned other input of the first amplifier circuit.