摘要:
A pulse transmitting device is provided to avoid interference between pulses due to multipath influence even in a high speed pulse transmission that is typical of a UWB by making use of a relatively simple method and to improve receiving quality. In the device, a pulse adjusting unit (110) generates pulses in response to transmitting data, a non-use interval setting unit (120) sets up a non-use interval where the pulses generated by the pulse adjusting unit (110) are not transmitted on the basis of a delay time that a delayed pulse caused by the multipath delays from a main pulse and takes until arriving at a communication partner. A pulse position adjusting unit (130) adjusts a pulse position not to transmit the pulses during the non-use pulse interval. An RF transmitting unit (140) converts the pulse, the position of which is adjusted by the pulse position adjusting unit, to a wireless frequency band and transmits a pulse wireless signal after the conversion to the communication partner.
摘要:
Using midambles, tracking delay profile creator 107 opens correlation windows in the range of 8 chips before and behind the top path and creates delay profiles within this range. From the delay profiles, path determiner 108 detects whether or not there is a new path before the top path, and, when there is a new path, determines whether or not this is its path. Based on the result of the determination at path determiner 108, when the new path is its path, frame position controller 109 sets the top path with the new path. On the other hand, when the new path is not its path, the top path set earlier is retained as is as the top path. Then, in accordance with the timing of the top path set, a received signal is demodulated. By this means, reception quality can be improved.
摘要:
A sheet feeding apparatus includes a stacking tray for stacking a sheet, a sheet feeding device for feeding the sheet, a register device for aligning a leading edge of the sheet fed by the sheet feeding device, a recognition device for recognizing a state that the sheets stacked on the stacking tray have different widths, and a setting device for setting a feeding distance according to a result of the recognition device. A control device controls the sheet feeding device to feed the sheet for the feeding distance.
摘要:
A received pulse signal based on an on-off keying modulation scheme is alternately sampled by AD conversion sections operated by a clock signal whose frequency is one-half of a transmission rate. In the synchronization, amounts of delay in sampling timing adjustment sections are made different from each other, whereby phases of two different points in a symbol pulse are sampled. An amount of delay in a variable delay section is adjusted in accordance with a result of comparison of the sampled values, thereby achieving synchronization. At the time of demodulation, the amount of delay in the variable delay section is held, and the amounts of delay in the sampling timing adjustment sections are switched to the same value, and the symbol pulse is alternately sampled. The sampled values are subjected to threshold value determination, and the determination result is subjected to parallel-to-serial conversion, whereby a demodulation output is acquired.
摘要:
The present invention has an object to provide a wireless apparatus which is capable of correctly sampling a waveform of a pulse even when a shape of the pulse is varied.A synchronizing apparatus for causing an input signal to be synchronized with a clock signal is equipped with sampling unit 102, 103, and delay control unit 112. The sampling unit 102 and 103 sample the input signal at first sampling timing and second sampling timing, which are separated from each other in a predetermined time interval. The delay control unit 112 shifts both the first and second sampling timing during synchronous pull-in operation, and also, narrows the interval between said first and second sampling timing during synchronous follow-up operation. A synchronous status judging unit 105 judges whether or not the input signal is synchronized with the clock signal based upon a phase error amount outputted from a phase error calculating unit 104, and outputs the synchronous status to a delay amount control unit 106. The delay amount control unit 106 controls to increase/decrease delay amounts which have been presently set in variable delay devices 107 and 108 based upon the phase error amount outputted from the phase error calculating unit 104 and the synchronous status outputted from the synchronous status judging unit 105.
摘要:
A pulse transmitter having a relatively simple structure and generating a pulse modulating signal even at a high transmission rate. In the pulse transmitter, a symbol pulse generating part (103) generates a symbol pulse of amplitude level β when data S1 is “0,” and that of amplitude level &ggr; when data S1 is “1” in the first pulse slot section, the data pulse generating part (104) generates a data pulse of amplitude level 0 when data S2 to Sn is “0,” and that of amplitude level α when data S2 to Sn is “1” in a later pulse slot section. The relationship of the amplitude levels keep the relation α
摘要:
It is an object of the invention to provide a variable delay apparatus in which, even immediately after the delay amount of the variable delay apparatus is changed, a signal of a timing that is different from a set delay amount is not output. The variable delay apparatus of the invention includes: a variable delay block 108 having N (N is a natural number) delay elements 101a to 101n, and N selectors 102a to 102n; a variable delay block 109 having N delay elements 103a to 103n, and N selectors 104a to 104n; and a selector 107. After selection signals 105a to 105n and 106a to 106n are changed, and after an output timing of a delay amount set by the variable delay blocks 108, 109 is attained, the signal to be output is switched by the selector 107, thereby avoiding a situation where, immediately after the delay amount is changed, a signal of a timing that is different from the set delay amount is output as an output signal.
摘要:
The present invention has an object to provide a wireless apparatus which is capable of correctly sampling a waveform of a pulse even when a shape of the pulse is varied.A synchronizing apparatus for causing an input signal to be synchronized with a clock signal is equipped with sampling unit 102, 103, and delay control unit 112. The sampling unit 102 and 103 sample the input signal at first sampling timing and second sampling timing, which are separated from each other in a predetermined time interval. The delay control unit 112 shifts both the first and second sampling timing during synchronous pull-in operation, and also, narrows the interval between said first and second sampling timing during synchronous follow-up operation. A synchronous status judging unit 105 judges whether or not the input signal is synchronized with the clock signal based upon a phase error amount outputted from a phase error calculating unit 104, and outputs the synchronous status to a delay amount control unit 106. The delay amount control unit 106 controls to increase/decrease delay amounts which have been presently set in variable delay devices 107 and 108 based upon the phase error amount outputted from the phase error calculating unit 104 and the synchronous status outputted from the synchronous status judging unit 105.
摘要:
It is an object of the invention to provide a variable delay apparatus in which, even immediately after the delay amount of the variable delay apparatus is changed, a signal of a timing that is different from a set delay amount is not output. The variable delay apparatus of the invention includes: a variable delay block 108 having N (N is a natural number) delay elements 101a to 101n, and N selectors 102a to 102n; a variable delay block 109 having N delay elements 103a to 103n, and N selectors 104a to 104n; and a selector 107. After selection signals 105a to 105n and 106a to 106n are changed, and after an output timing of a delay amount set by the variable delay blocks 108, 109 is attained, the signal to be output is switched by the selector 107, thereby avoiding a situation where, immediately after the delay amount is changed, a signal of a timing that is different from the set delay amount is output as an output signal.