摘要:
A data receiving system comprising an I base-band signal and a Q base-band signal which are used in a quadrature demodulation operation. Zero-crossing points of respective base-band signals are detected and a control signal is generated in response to each zero-crossing point. A phase-shift switching circuit alternately selects either the I base-band signal or the Q base-band signal in response to the control signal to generate an I/Q base-band signal. And, a demodulation operation is executed on the basis of the I/Q signal.
摘要:
An FSK data receiving system is provided which is capable of constituting a direct-conversion receiver suitable for realizing an integrated circuit, is capable of decoding in a wide receiving band width, and is capable of realizing a small-sized and less-electric power consumption data receiving. An FSK-modulated local oscillator signal 3 is applied to a local oscillator 2, and there is provided a decode circuit 15 which obtains the decode signal 14 by judging whether the FSK-modulated frequency deviation of the carrier wave signal 1 is a positive deviation or a negative deviation on the basis of a comparison result of a voltage change in a frequency-voltage conversion circuit 16 for a base-band signal 8; i.e. the output signal of a frequency mixer 6. An offset amount of the local oscillator frequency is judged by a voltage judging circuit 17 to produce a control signal 18 Further, there is provided another decode circuit 22 which makes a judgement of frequency change of the base-band signal 8 and a judgement of in-phase/opposite-phase relationship from the decode signal 14 and the output of the voltage judging circuit 17 so as to obtain a decode signal 23. Moreover, there is provided a decode signal processing circuit 25 which obtains a decode signal 24 from the decode signals 14, 23 in response to the control signal 18.
摘要:
A direct-conversion receiver includes a local oscillator for generating a local oscillator signal, a converter circuit for converting a received radio signal into a pair of a baseband I signal and a baseband Q signal in response to the local oscillator signal, a demodulator for demodulating the pair of the baseband I signal and the baseband Q signal into a demodulation-resultant signal which is neither an I signal nor a Q signal, a detector circuit for detecting a difference between a frequency of the local oscillator signal and a frequency of a carrier of the received radio signal, a clock signal generator for generating a first clock signal providing a timing which corresponds to a center of a symbol period, a signal delay device for delaying the first clock signal to provide a second clock signal, and a symbol deciding circuit for deciding a logic state of the demodulation-resultant signal at a timing determined by the second clock signal.
摘要:
A direct-conversion receiver includes a direct-conversion demodulator. A first device detects a strength of a received signal. A clock signal generator outputs a clock signal in response to a reception start signal. The clock signal has a frequency corresponding to a symbol rate or higher. A second device samples an output signal of the demodulator at a timing determined by the clock signal. A third device samples an output signal of the first device at a timing determined by the clock signal. A fourth device stores "n" output signals of the second device which relate to a signal periodically transmitted from a transmitting station "n" times, wherein "n" denotes a natural number equal to 2 or greater. A fifth device stores "n" output signals of the third device which correspond in timing to the "n" output signals of the second device. A sixth device reads out signals from the fourth device, and reads out signals from the fifth device. The sixth device weights the signals read out from the fourth device in response to the signals read out from the fifth device. A seventh device combines output signals of the sixth device.
摘要:
A first demodulator for generating a demodulated signal by demodulating first and second baseband signals obtained from a received frequency shift keying signal, comprises: a first mixer for mixing the first baseband signal with the second baseband signal; a frequency divider for 1/2-frequency-dividing an output of the first mixer; a second mixer for mixing the first baseband signal with an output of said frequency divider; and a frequency judging circuit for judging whether or not a frequency of an output of the second mixer is larger than a reference value to generate the demodulated signal. In order to effect the frequency judging by the frequency judging circuit always at a high frequency, there may be further provided a first inverter after the first mixer, a second inverter after the frequency judging circuit for compensating the inverting of the first inverter, and a frequency comparing circuit for detecting the frequency of the output of the first mixer. In order to effect the frequency judging on the second baseband signal side, third and fourth mixers may be further provided. The frequency judging are made from the first baseband signal and the second baseband signal.
摘要:
An FSK demodulator for demodulating first and second baseband signals obtained from a received frequency shift keying signal, the first and second baseband signals having a quadrature relation therebetween, a lead and lag relation between the first and second baseband signals being changed in accordance with frequency shift from a carrier frequency of the frequency shift keying signal, comprises: a voltage change judging circuit for judging whether a magnitude of the first baseband signal increases or decreases within a predetermined interval; and an inverting circuit responsive to an output of the voltage change judging circuit and the second baseband signal for outputting a demodulated signal produced by inverting the second baseband signal in accordance with the output of the voltage change judging circuit. In addition, a second voltage change judging circuit and a second inverting circuit and a combining circuit for combining the results of said first and second inverting circuits may be provided to improve noise resistance. Inflection points in the baseband signal are detected to select one output from the first, second inverting circuit and the combining circuit in accordance with detection of the inflection points.
摘要:
A package structure that includes wings that extend from both sides in the width direction provided on an absorbent article. On first regions on the clothing side of the wings and second regions on the clothing side of the backing sheet, adhesive for affixing the absorbent article to underwear is applied. With the wings folded toward the skin-contacting side of the surface sheet, a water-degradable release sheet is provided so as to cover the first regions. Wrapping sheet is non-water-degradable, is peelable from the underwear-affixing adhesive and is provided so as to cover the second regions.
摘要:
A highly safe catheter that measures electric potential can be inserted into a cardiac chamber together with a balloon-tip ablation catheter and is able to prevent abnormal heat generation at electric potential-measuring electrodes even when high-frequency current is distributed. The catheter includes a shaft having electric potential-measuring electrodes, a metal portion with a length of 2 mm or more, and a lumen passing therethrough from a proximal end to a distal end in the longitudinal direction; and a metal wire inserted through the lumen and connected to the metal portion.
摘要:
A saddle type vehicle includes: a seating seat on which a passenger is allowed to be seated; a seat rail to which the seating seat is allowed to be attachably and detachably attached; a frame cover covering outer sides of the seat rail; a helmet holder provided on the seat rail; and a restriction part provided in the vicinity of the helmet holder on the seat rail and projecting toward an inner peripheral surface of the frame cover, in which the helmet holder includes: a hooking portion on which a hook ring of a helmet is allowed to be hooked; and a guide portion extending from the hooking portion, and the restriction part is provided in the middle, of the guide portion, in a longitudinal direction.
摘要:
When one of armature coils is in a beginning of a commutation process, a center line of a trailing end tooth of a corresponding group of teeth, around which the one of the armature coils is wound, is generally aligned with a corresponding boundary between magnets. When the one of the armature coils is in an end of the commutation process, a center line of a leading end tooth of the corresponding group of the teeth is generally aligned with another boundary between the magnets.