KR960030567A - Receiver - Google Patents

Abstract

It is an object of the present invention to provide an orthogonal demodulation method in which a clock signal of a microcomputer can be used for a second local power generation signal with a simple configuration, and demodulation characteristics can be obtained even if DC components are removed from I and Q signals. It is an object of the present invention to realize a receiving device which can be constituted by a monolithic IC, which is characteristic of a conventional orthogonal demodulation method, without deteriorating. In this configuration, the frequency modulated signal is converted into a first local oscillation signal 6. Orthogonally mixed to separate the I signal and the Q signal into two orthogonal signals, and then add or divide the two signals generated as a result of orthogonal mixing with the I and Q signals and the second local oscillation signal 10. In the orthogonal demodulation method of converting and demodulating a frequency modulated signal again by subtracting, after adding or subtracting two signals generated as a result of orthogonal mixing with the second local oscillation signal 10, 2 by inserting the band-pass filter to remove frequencies above a high frequency component of the local oscillation signal 10 were to be used in the rectangular-wave second local oscillation signal (10). In addition, by performing frequency correction on the first local oscillation signal 6 or by setting the first local oscillation frequency outside of the occupied band of the reception signal, a filter used for the I and Q signals can be used as a band pass filter. It is characterized in that it is possible to cope with the intermittent operation.

Description

Receiver

Since this is an open matter, no full text was included.

2 is a block diagram of a receiving apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram of a receiving apparatus according to another embodiment of the present invention, and FIG. 4 is a receiving apparatus according to another embodiment of the present invention. Fig. 5 is a block diagram of a switch means in an embodiment of the present invention, and Fig. 6 is a 90 ° or more with a second local oscillation means in an embodiment of the present invention. Fig. 7 is a block diagram of the means, and Fig. 7 is a block diagram of the frequency-to-voltage converting means according to one embodiment of the present invention.

Claims (8)

A first local oscillating means, first mixing means for mixing a signal from the first local oscillating means and a frequency-modulated received signal, a signal obtained by shifting a signal from the first local oscillating means by 90 degrees, and the frequency An orthogonal transform receiver having a second mixing means for mixing a modulated received signal, comprising: a first band pass filter as a signal from the first mixing means and a signal from the second mixing means as inputs; A second band pass filter, second local oscillating means for generating a continuous rectangular wave signal in time, and a rectangular wave signal from the second local oscillating means, to turn ON / OFF the signal from the first band pass filter The signal from the second band pass filter is turned ON / OFF by the first switch means and a rectangular wave signal obtained by shifting the rectangular wave signal from the second local oscillation means by 90 degrees. A second switch means, a calculation means for adding or subtracting the output signal of the first switch means and the output signal of the second switch means, and a second local oscillation means which is installed at a previous stage or a later stage of the computation means. And a third band pass filter having a center frequency in the vicinity of a frequency of the difference between the received signal and the first local oscillation means from a frequency of the rectangular wave signal generated by the second signal. A first local oscillating means, first mixing means for mixing a signal from the first local oscillating means and a frequency-modulated received signal, a signal obtained by shifting the signal from the first local oscillating means by 90 degrees, and the frequency An orthogonal transform receiver having a second mixing means for mixing a modulated received signal, comprising: a first band pass filter as a signal from the first mixing means and a signal from the second mixing means as inputs; A second band pass filter, second local oscillation means for generating a continuous rectangular wave signal in time, and a rectangular wave signal from said second local oscillation means to turn on / off the signal from said first band pass filter; A signal from the second band pass filter is turned ON / OFF by a rectangular wave signal obtained by shifting the rectangular wave signal from the first switch means and the second local oscillation means by 90 degrees. A second switch means, a calculation means for adding or subtracting the output signal of the first switch means and the output signal of the second switch means, and a second local oscillation means which is installed at a previous stage or a later stage of the computation means. A third bandpass filter having a center frequency in the vicinity of the frequency of the rectangular wave signal generated by the first local oscillation means from the frequency of the rectangular wave signal, and the third bandpass filter An average frequency detecting means for detecting an average frequency of the output, and a frequency correcting means for controlling the output frequency of the first local oscillating means in a direction in which a difference between the value detected by the average frequency detecting means and a predetermined value decreases. Receiving device, characterized in that. The receiving device according to claim 1 or 2, wherein the first local oscillating means outputs a signal having a frequency approximately equal to the center frequency of the received signal. The receiving device according to claim 1 or 2, wherein the first local oscillating means outputs a signal of a frequency separated from a center frequency of the received signal by more than an occupied band of the received signal. 3. The first or second switch means according to claim 1 or 2, wherein the first or second switch means has a first input terminal, a second input terminal, an output terminal, and a control terminal and the output terminal is inputted to the first control terminal by a signal input to the control terminal. And an inverting means for outputting a signal inputted to a first input terminal of the electronic switch and an inverted signal to a second input terminal of the electronic switch. Receiving device, characterized in that. The pulse frequency shaping means for converting the output of the third band pass filter into a pulse waveform, and a pulse for measuring the number of pulses from the pulse shaping means for a predetermined time. A receiving apparatus comprising: water measuring means, and outputting a value measured by the pulse water measuring means. 3. An average frequency detecting means according to claim 2, wherein the average frequency detecting means comprises: pulse waveform shaping means for converting the output of the third band pass filter into a pulse waveform, and a time until the number of pulses from the pulse shaping means reaches a predetermined number; And a time measuring means for measuring and outputting a value measured by said time measuring means. 3. The apparatus of claim 2, wherein the average frequency detecting means averages the frequency-voltage converting means, the output voltage of which is changed in accordance with the frequency of the output of the third band pass filter, and the output of the frequency-voltage converting means for a certain time. And an average voltage output means, and outputting the output value of the average voltage output means. ※ Note: The disclosure is based on the initial application.