Abstract: A communication apparatus determines a hibernation period on the basis of the amount of an offset in beacon period start timing among multiple beacon groups. The communication apparatus is placed in a hibernation status in accordance with the determined hibernation period. Thus, an offset in beacon period start timing among the beacon groups that would occur while the device is in hibernation can be prevented and the need for merging beacon groups and decrease in data rate during such merging are prevented.

Abstract: When setting information for wireless communication is registered for a peripheral device by an information processing apparatus, the original setting information set in the information processing apparatus is backed up, then the setting information based on unique information of the peripheral device is set in both the information processing apparatus and the peripheral device, thereby a wireless communication is established between the information processing apparatus and the peripheral device. Then the original setting information is copied in the peripheral device via the wireless communication. Thereafter, the information processing apparatus restores the backed up original setting information.

Abstract: When setting information for wireless communication is registered for a peripheral device by an information processing apparatus, the original setting information set in the information processing apparatus is backed up, then the setting information based on unique information of the peripheral device is set in both the information processing apparatus and the peripheral device, thereby a wireless communication is established between the information processing apparatus and the peripheral device. Then the original setting information is copied in the peripheral device via the wireless communication. Thereafter, the information processing apparatus restores the backed up original setting information.

Abstract: An SSID and an encryption key of a wireless LAN apparatus of computer peripheral equipment are calculated based on a manufacturer's serial number of the computer peripheral equipment to be stored in the wireless LAN apparatus of the computer peripheral equipment. On the other hand, for an SSID and an encryption key of a computer wirelessly connected to the computer peripheral equipment, when driver software of the computer peripheral equipment is installed, a user inputs the manufacturer's serial number of the computer peripheral equipment, and the SSID and the encryption key of a wireless LAN apparatus are calculated on the computer to be stored in the wireless LAN apparatus of the computer. Thus, the same SSID and encryption key as those of the computer peripheral equipment can be set in the computer.

Abstract: A foldable mobile telephone which is constituted of a main body and a lid being open/close-able and is able to detect open/close state of the lid is provided. The main body provides a receiver for ultrasonic wave and the lid provides a microphone for ultrasonic wave. An ultrasonic oscillator intermittently generates an ultrasonic signal at each fixed interval and gives the ultrasonic signal to the receiver for ultrasonic wave. The receiver for ultrasonic wave receives the ultrasonic signal from the ultrasonic oscillator and generates an ultrasonic wave. The microphone for ultrasonic wave receives the ultrasonic wave generated by the receiver for ultrasonic wave and generates an ultrasonic detecting signal. An ultrasonic level judging circuit receives the ultrasonic detecting signal from the microphone for ultrasonic wave and judges whether the level of this ultrasonic detecting signal is higher or lower than a decided level and judges the open/close state of the lid and generates a judging signal.

Abstract: A surface acoustic wave converter for converting an electric signal into a surface acoustic wave includes an interdigital transducer provided on a piezoelectric substrate. The interdigital transducer has first and second electrode groups each having one or more electrode fingers to which a first signal is almost simultaneously inputted. The surface acoustic wave converters includes first input unit for inputting the first signal to the one or more electrode fingers of the first electrode group, and second input unit for inputting the first signal to the one or more electrode fingers of the second electrode group when at least one of surface acoustic waves excited by the first signal in the one or more electrode fingers of the first electrode group reaches one of the one or more electrode fingers of the second electrode group.

Abstract: In a surface acoustic wave apparatus, a surface acoustic wave element for obtaining a convolution signal is housed in a recess of a substrate. Since the surface acoustic wave element is housed in the recess of the substrate in this surface acoustic wave apparatus, the apparatus can be compactified. This effect of compactification is remarkable, because the surface acoustic wave element has an output electrode for obtaining the convolution signal and thus originally has a big element size. When a laminate substrate is used as the substrate, a configuration for effectively using surfaces of respective layers may be arranged in such a manner that output wiring of the convolution signal is separately formed in the layers. This further enhances the effect of compactification. There are further disclosed a spread spectrum signal receiver using the above surface acoustic wave apparatus for receiving a spread spectrum signal, and a spread spectrum communication system using the spread spectrum signal receiver.

Abstract: A spread spectrum receiving apparatus is constructed by a generator for generating a reference clock, a phase shift circuit for shifting the phase of the reference clock generated by the generator in accordance with a code timing in a reception signal and the reference clock, and a de-spreading circuit for de-spreading the reception signal in accordance with the reference clock whose phase is shifted by the phase shift circuit. The de-spreading circuit generates a code for de-spreading in accordance with the phase shifted reference clock. The phase shift circuit has a calculator for calculating a phase shift amount so as to synchronize the code timing in the reception signal with the code for reception in accordance with a deviation between the code timing in the reception signal and the reference clock.

Abstract: A matched filter has an input IDT and an output IDT, and also has a device for preventing propagating surface acoustic waves from diverging. By preventing the divergence of surface acoustic waves, signals obtained in units of electrode finger pairs of the output IDT are uniformed. Furthermore, this application also discloses the following arrangement. That is, an arrangement for converging surface acoustic waves is adopted, and the width of surface acoustic waves input to the output IDT is set to be larger than at least the crossing width of electrode fingers, nearest to the input IDT, of those of the output IDT, so that some surface acoustic waves propagate along non-crossing portions of the electrode fingers, on the input IDT side, of those of the output IDT. With this arrangement, the influence of the crossing portions of the electrode fingers, closer to the input IDT, on the surface acoustic waves input to the crossing portions of the electrode fingers, farther from the input IDT, can be relaxed.

Abstract: A surface acoustic wave device includes a piezoelectric substrate, first and second input transducers formed on the substrate and adapted for respectively generating surface acoustic waves corresponding to input signals, the first and second input transducers each having a shape to focus the surface acoustic waves generated thereby, an output transducer formed between the first and second input transducers on the substrate and adapted for obtaining a convolution -signal of the surface acoustic waves generated by the first and second input transducers, and conductive films, one formed between the first input transducer and the output transducer and another between the second input transducer and the output transducer on the substrate.

Abstract: A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions of mutually different pitches of the electrode finger, respectively corresponding to different frequencies. The portions are parallelly arranged along a direction perpendicular to the propagation direction of the surface acoustic wave. The surface acoustic wave generated by the interdigital transducer is entered in concentrated manner into the wave guide path.

Abstract: A surface acoustic wave device includes a substrate having piezoelectricity, at least two input electrodes, provided on the substrate, for exciting first and second surface acoustic waves, and an output electrode for taking a convolution signal of the two surface acoustic waves out. The substrate has a roughness configuration on a back face thereof and a maximum depth of the roughness configuration is not less than a wavelength of bulk waves of convolution output taken out of the output electrode.

Abstract: A device for detecting the position of an information recording or reproducing head relative to a recording medium; the head is relatively rotatable around a first axis with respect to the recording medium, and rotatable around a second axis parallel to the first axis. The device includes an autocollimator for measuring a relative positional relationship of the head substantially along the direction of the rotation around the second axis, a rotating table on which either the combination of the recording medium and the head or the autocollimator is mounted to activate the rotational movement substantially around the second axis, and a control unit. The control unit rotates the rotating table in response to the obtained position of the head with respect to the recording medium. According to the measurement result by the autocollimator, the control unit accomplishes a relative positional controlling in which a relative positional relationship between the autocollimator and the head is kept constant.

Abstract: A correlator includes a reference signal generating device for generating a reference signal with period T, n-convolvers each having an action time of T/n where n is an integer of at least 2, into each of which an information signal and a reference signal are input and each of which outputs a convolution signal of the information signal and the reference signal, a delay device for delaying an information signal input into a k-th convolver among the n convolvers for a time of (k-1)T/n where k=1, 2, . . . , n and for delaying a reference signal input into the k-th convolver for a time of (n-k)T/n, and an adder for adding convolution signals respectively output from the n convolvers. A receiver includes such a correlator for outputting a correlation signal of a received information signal and a reference signal, and a decoding circuit for decoding data from the correlation signal output from the correlator.

Abstract: A signal processing method includes the steps of inputting first to N-th 2-phase sinusoidal wave signals, where N is a natural number (N.ltoreq.2) and an m-th 2-phase sinusoidal wave signal has an m-th frequency where m is a natural number and satisfies a relation of 1.ltoreq.m.ltoreq.N, and processing the first to N-th 2-phase sinusoidal signals by product summation or product differentiation of the first to N-th 2-phase sinusoidal wave signals to produce at least one signal having a frequency equal to a sum of the frequencies of the first to N-th 2-phase sinusoidal wave signals.

Abstract: A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions of mutually different pitches of the electrode finger, respectively corresponding to different frequencies. The portions are parallelly arranged along a direction perpendicular to the propagation direction of the surface acoustic wave. The surface acoustic wave generated by the interdigital transducer is entered in concentrated manner into the wave guide path.

Abstract: Controlled by a signal level produced by a microphone (12), a noise suppressing circuit (25) supplies a first attenuator (16) with a local level which is equal to the signal level and is suppressed to a predetermined output level when the signal level is lower and higher than a predetermined input level. Cooperating with a drive level produced by a second attenuator (17) to drive a loudspeaker (13), the local level makes a comparator unit (21-23) produce a control signal for making the first attenuator give smaller and greater amounts of attenuation to the signal level with the drive level rendered by the second attenuator low and high when positive and negative values are had, respectively, by an input difference equal to the local level less the drive level. Preferably, the local level is suppressed by a level difference had by the signal level above the predetermined input level.

Abstract: In a signal processing apparatus and method, original two-phase signals each having the possibility of amplitude fluctuation are received by an input portion. From the original two-phase signals received by the input portion, new two-phase signals are formed by a signal processing portion. The signal processing portion forms an intermediate stage two-phase signal and a phase component eliminated signal having the phase components of the original signals eliminated therefrom in parallel from the original two-phase signals, and eliminates the fluctuation component of amplitude by the offsetting process of respective ones of the two-phase signals and the phase component eliminated signal to thereby form the new two-phase signals. The new two-phase signals have a predetermined phase relation with the original two-phase signals. The new two-phase signals are output from an output portion. This specification also discloses a displacement detecting apparatus using such a signal processing apparatus.

Abstract: Fluorine-containing vitamin D.sub.3 analogues of the formula [I]: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently hydrogen atom, a chemically inactive hydroxy-protecting group, an acyl having 2 to 8 carbon atoms or an alkyl having 1 to 8 carbon atoms, and n is an integer of 4 to 6, which have excellent pharmacological activities, particularly anti-tumor activity owing to differentiation-inducing activity and are useful for the prophylaxis and treatment of various tumors and intermediates therefore.

Abstract: This invention relates to signal processing for enhancing detection resolving power on the basis of a periodic signal obtained in a displacement detecting device such as an encoder or a laser length measuring machine, and on the basis of input sine wave and cosine wave signals which are the references, a sine wave signal and a cosine wave signal of a frequency integer times as high as the frequency of the reference signals are produced by calculation by the use of adders, multipliers, etc.