Clarion Co

Canon Kabushiki Kaisha

The University of Tokyo

Mamoru Endo

Yoshitaka Uchida

Masahiro Hamatsu

Shigeo Akazawa

Takashi Sukegawa

Yohei Kobayashi

Makoto Gonokami

Akira Ozawa

Mashiro Hamatsu

The present invention provides a spectral apparatus for spectrally separating light including a predetermined wavelength, including a slit that the light enters, a first optical system configured to collimate the light from the slit, a transmissive type diffraction element configured to diffract the light from the first optical system, and a second optical system including a first mirror configured to reflect the light diffracted by the transmissive type diffraction element, and a second mirror configured to reflect the light reflected by the first mirror and diffracted by the transmissive type diffraction element, and configured to make the light reciprocally travel between the first mirror and the second mirror via the transmissive type diffraction element.

Spectral apparatus, detection apparatus, light source apparatus, reaction apparatus, and measurement apparatus

On the transmitter side, data to be transmitted are converted into a plurality of parallel data sets by a serial-parallel converter 101 and spread spectrum modulation is effected by means of PN code generators 105 and selectors 102. Each of the modulated outputs is delayed by a delaying circuit 103 with reference to a sounder channel and the phase thereof. The output thus delayed and the output of the sounder channel are added by an adder 104 to be multiplexed and transmitted. On the receiver side, correlation between a received signal and a reference signal is formed by a correlator 201 to obtain a correlation pulse from the correlation output thus obtained. Data demodulation is effected by means of a sounder detecting circuit 209, a sampling pulse generating circuit 210 and an information detecting circuit 211, starting from this correlation pulse. According to the structure described above, in SS communication, data demodulation can be effected with a high efficiency by using a single correlator.

Spread spectrum communication device

On the transmitter side of a spread spectrum communication device according to the present invention, transmission date are converted into a plurality of parallel data sets by a serial-parallel convertor and spread-spectrum-modulation is effected by means of PN code generators and selectors. Different modulated outputs are delayed by delay devices, using a sounder channel and the phase thereof as a reference. The delayed outputs and the output of the sounder channel are added by an adder, multiplexed and transmitted. On the receiver side correlation of a received signal with a reference signal is formed by a correlator and a correlation pulse is obtained from the correlation output. Data are reproduced by means of a sounder detecting circuit, a sampling pulse generating circuit and an information detecting circuit. In this way data reproduction can be effected with a high efficiency by means of a single correlator.

In a spread spectrum modulating device according to the present invention transmission data are converted into parallel data by a serial-parallel converting circuit, which are held by a latch circuit and assign upper digit addresses. Lower digit addresses in the memory are assigned by a counter. Parallel data outputted by the memory are converted into analogue signals by a D/A converter, which analogue signals are multiplied by a carrier by a multiplier to obtain a spread spectrum signal. Owing to the construction described above, a simple and small scale construction can be realized for the spread spectrum modulating device.

Spread spectrum modulating device

A device according to the present invention comprises a variable notch filter, a PN code generator, a VCO and a convolver. The frequency is swept within the band of the convolver by the VCO after having stopped operations of the variable notch filter and the PN code generator and the output of the convolver at this time is detected. When the output thus detected exceeds a threshold, a detected signal is sent to the variable notch filter to control the notch part thereof so as to correspond to disturbing wave to remove the disturbing wave from a received signal. Since the convolver is used not only for a correlator but also for a disturbing wave detector, the construction can be simple and cheap.

Narrow band disturbing wave detecting device

A signal processing circuit utilizes a convolver correlating a reference carrier signal with a received signal. The correlator output is detected and then demodulated to output the signal information originally present on the carrier. For a conventional AM signal the reference carrier signal is applied at a frequency offset from the AM center frequency. When the carrier is an FM signal, the reference signal is applied at a frequency equal to the center frequency of the FM signal. Similar procedures are followed for a spread-modulated AM signal, and the reference signal is modulated with a suitably timed-reverse replica of the pseudo-noise code. A similar procedure is used to process spread-spectrum frequency shift keyed FM signals.

Communication device

In a carrier signal modulating device a carrier signal is modulated by using a square phase sequence as a PN code.

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Tokyo, Japan

Mamoru Endo