JP2000286725A - Spurious reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a modulator or a demodulator to generate a transmission signal with high quality by reducing spurious radiation produced at present in the transmission signal. SOLUTION: A transmitter is provided with a plurality of local oscillators 1, 2, a mixer 3 that mixers an oscillated signal from the local oscillators 1, 2 with a transmission signal, and a control means 4 that controls a change in the oscillated frequency from the local oscillators 1, 2, and the transmitter changes a configuration of the frequency to be mixed and outputted from a plurality of the local oscillator 1, 2 to a different configuration of the frequency at which so spurious radiation is caused under the control of the control means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spurious reduction apparatus, and more particularly to a spurious reduction apparatus for reducing spurious signals present in a modulated signal or a demodulated signal in communication means using radio waves.

[0002]

2. Description of the Related Art Conventionally, an apparatus described in Japanese Patent Application Laid-Open No. 8-331005 is known as a spurious reduction apparatus. Hereinafter, the conventional spurious reduction apparatus will be described with reference to FIG. FIG. 10 is a block diagram showing a configuration of a conventional spurious reduction device in a modulation / demodulation device. In FIG. 10, 1 and 2 are local oscillators for demodulating received signals for reducing spurious signals, 33 and 34 are local oscillators constituting the frequency of a transmitted signal, 35 is a mixer for outputting a transmitted signal, and 36 and 37 are demodulated signals. It is a mixer to constitute.

In FIG. 10, local oscillators 33, 3
4, the mixer 35 and the control means 31 constitute a spurious reduction device for the modulator, and the local oscillators 1 and 2, the mixers 36 and 37 and the control means 31 constitute a spurious reduction device for the demodulator. In each of the local oscillators 1, 2, 33, and 34, a frequency relationship is configured so that the frequencies do not overlap with each other, so that interference between the transmitter and the receiver is reduced to prevent spurious radiation and the like. By doing so, deterioration of the characteristics is prevented.

[0004]

However, in the above-mentioned conventional spurious reduction apparatus, interference between frequencies is reduced by preventing signals used in a transmission modulator and a reception demodulator from overlapping. However, there is a problem that spurious components actually occurring in a transmission signal or a reception signal cannot be reduced in a transmission modulator or a reception demodulator.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a modulator or a demodulator, it is possible to reduce a spurious signal of a transmission signal or a received signal in which spurious signals are actually generated. It is an object of the present invention to generate a high-quality transmission signal or demodulated signal with reduced noise.

[0006]

According to the present invention, in order to solve the above-mentioned conventional problems, a transmitter or a receiver mixes a plurality of local oscillators and an oscillation signal of the local oscillator with a transmission signal or a reception signal. A mixer and control means for controlling the change of the oscillation frequency of the local oscillator, and for a transmission signal or a reception signal having a spurious signal, by controlling the control means, without changing the frequency of the transmission signal or the reception signal, The frequency configuration of a plurality of local oscillators to be mixed is changed to a different frequency configuration that does not generate spurious.

According to the present invention, by changing the oscillation frequency of the local oscillator, it is possible to reduce spurious in a transmission signal or a reception signal, and to generate a high-quality transmission signal or demodulation signal with reduced spurious. A spurious reduction device that can

In order to solve the above-mentioned conventional problems, the present invention provides a transmitter or a receiver for detecting a spurious signal contained in a transmission signal or a reception signal, and a spurious attenuation means for attenuating spurious signals of an arbitrary frequency. And control means for controlling the spurious attenuation means based on the detection information of the spurious detection section. For the transmission signal or the reception signal having an arbitrary spurious, the control means controls the spurious attenuation means to reduce the spurious. The transmission signal is generated or the reception signal is demodulated.

According to the present invention, any spurious contained in the transmission signal or the reception signal detected by the spurious detection section is attenuated by the spurious attenuation means, so that the spurious contained in the transmission signal or the reception signal of any frequency is obtained. A spurious reduction apparatus capable of reducing the spurious and generating a high-quality transmission signal or demodulated signal with reduced spurious is obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a plurality of local oscillators that mix to form the frequency of a transmission signal, and a transmission signal that mixes an input signal and the frequency of the local oscillator. And a control means for controlling to change the frequency configuration of the plurality of local oscillators, wherein the control means does not change the frequency of the transmission signal without changing the frequency of the input signal before mixing by the mixer. The frequency configuration of the plurality of local oscillators is changed, and under the control of the control unit, the frequency of the local oscillator mixed with the transmission signal is changed to a different frequency configuration without changing the frequency of the transmission signal. By doing so, it is possible to generate a high-quality transmission signal with reduced spurious.

According to a second aspect of the present invention, the frequency configuration of the plurality of local oscillators is changed to a frequency different from a predetermined frequency, and a spurious is generated in advance in the mixer output. By changing the frequency of the local oscillator mixed with the transmission signal to a different frequency configuration under the control of the control means for the transmission signal that is known to be generated, a high-quality transmission signal with reduced spurious is generated. It has the effect of being able to.

According to a third aspect of the present invention, there are provided a plurality of local oscillators that mix to form a frequency of a transmission signal, and a mixer that mixes an input signal and the frequency of the local oscillator to generate a transmission signal. A spurious detection unit that detects a transmission spurious in a transmission signal, and a control unit that controls to change the frequency configuration of the plurality of local oscillators to an arbitrary frequency configuration based on spurious detection information from the spurious detection unit. Wherein the control means changes the frequency configuration of the plurality of local oscillators to an arbitrary frequency configuration without changing the frequency of the input signal before mixing by the mixer. Detects any transmission spurious from the transmission signal, and controls the transmission signal without changing the frequency of the transmission signal under the control of the control means. By which it is adapted to change to a different frequency configurations of any of the frequency of the local oscillator is, an effect that can generate a good transmission signal quality with reduced spurious.

According to a fourth aspect of the present invention, there is provided a mixer for generating a transmission signal, a spurious detection unit for detecting a transmission spurious in the transmission signal, and a transmission spurious of an arbitrary frequency in the transmission signal from the mixer. A spurious attenuating means that attenuates, and a control means that controls the spurious attenuating means based on spurious detection information from the spurious detection unit, and detects any transmission spurious from a transmission signal and transmits the signal. The transmission spurious is reduced by the spurious reduction unit under the control of the control unit without changing the frequency configuration for generating the signal, so that it is possible to generate a high-quality transmission signal with reduced spurious. Have.

According to a fifth aspect of the present invention, the spurious attenuating means includes a notch filter using a passive element circuit. As the spurious attenuating means, a notch filter having a variable frequency is used. By using the passive element, only the target frequency can be reduced by using the element, an effect that a high quality transmission signal with reduced spurious can be easily generated.

According to a sixth aspect of the present invention, the spurious attenuation means includes a digital filter. By using a digital filter as the spurious attenuation means, the spurious attenuation means has a desired frequency characteristic. By changing the attenuating characteristic, it is possible to generate a high-quality transmission signal with reduced spurious.

According to a seventh aspect of the present invention, there is provided a mixer for generating a transmission signal, a spurious detection section for detecting a transmission spurious in the transmission signal, and a transmission spurious at a plurality of frequencies in the transmission signal from the mixer. A spurious attenuating means for attenuating; and a control means for controlling the spurious attenuating means based on spurious detection information from the spurious detecting section. The spurious attenuating means connects filters having different attenuation bands in parallel and switches the filters. Switching means is provided, and as a spurious attenuation means, a plurality of filters are connected in parallel and switched and used, thereby obtaining a stable amount of spurious attenuation without changing the filter characteristics to be used. To generate high quality transmission signal with reduced spurious It has the effect that it is Rukoto.

According to an eighth aspect of the present invention, there is provided a mixer for generating a transmission signal, a spurious detection unit for detecting a transmission spurious in the transmission signal, and a transmission spurious at a plurality of frequencies in the transmission signal from the mixer. A spurious attenuating means for attenuating, and control means for controlling the spurious attenuating means based on spurious detection information from the spurious detecting section, wherein the spurious attenuating means includes one or more filters connected in series and having different attenuation bands. ,
A bypass circuit for bypassing the filter, and switching means for switching between each filter and the bypass circuit are provided.As a spurious attenuation means, a plurality of filters are connected in series and switched for use. Required filter characteristics can be added, and a stable spurious attenuation can be obtained without changing the filter characteristics to be used, and a high-quality transmission signal with reduced spurious can be generated. It has the action of:

According to a ninth aspect of the present invention, the spurious attenuating means includes a divider for dividing the transmission signal output from the mixer into two, and a filter for removing the transmission signal from the signal from the distributor. A phase shifter that inverts the phase of the signal from the filter, and a combiner that combines the output of the phase shifter and the other transmission signal distributed by the distributor, and the signal whose phase is inverted in the combiner. And a signal whose phase is not inverted. The spurious attenuation means divides the output signal of the mixer into two, deletes the transmission signal from one of the output signals, and removes the phase of the signal from which the transmission signal has been deleted. Is inverted by 180 degrees, the level is adjusted by an amplifier, and then combined with the other output signal from the splitter in the combiner, so that everything except the transmission signal is It is possible to attenuate the spurious,
This has the effect of generating a high-quality transmission signal with reduced spurious.

According to a tenth aspect of the present invention, there is provided the spurious reduction apparatus according to the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth aspect, and transmission included in a transmission signal is included. Claims 1 and 2 are intended to reduce spurious.
With the provision of the spurious reduction device described in 2, 3, 4, 5, 6, 7, 8, or 9, it is possible to generate a high-quality transmission signal with reduced transmission spurious included in the transmission signal. It has the effect that a transmitter can be obtained.

According to an eleventh aspect of the present invention, there are provided a plurality of local oscillators for generating an oscillation signal, a mixer for mixing the oscillation signal of the local oscillator and outputting a demodulated signal, and a mixer for the plurality of local oscillators. Control means for controlling to change the frequency configuration, wherein the control means changes the frequency configuration of the plurality of local oscillators without changing the frequency of the demodulated signal before changing the frequency of the received signal before mixing by the mixer. The frequency configuration of the local oscillator mixed with the reception signal or the reception signal in which spurious is generated due to the interfering wave mixed into the local oscillator is changed to a different frequency configuration under the control of the control means. As a result, it is possible to generate a high-quality demodulated signal with reduced spurious of the received signal.

According to a twelfth aspect of the present invention, the frequency configuration of the plurality of local oscillators is changed to a frequency different from a predetermined frequency, and is mixed into a received signal or a local oscillator. By changing the frequency configuration of the local oscillator, which is mixed with the received signal that is known to generate spurious signals at the mixer output in advance by the interference signal, to a different frequency configuration under the control of the control means, This has the effect of generating a high-quality demodulated signal with reduced spurious.

According to a thirteenth aspect of the present invention, there are provided a plurality of local oscillators for generating an oscillating signal, a mixer for mixing the oscillating signal of the local oscillator and outputting a demodulated signal, and adding a spurious to the demodulated signal. A spurious detection unit for detecting, and control means for controlling a frequency configuration of the plurality of local oscillators to be changed to an arbitrary frequency configuration based on detection information from the spurious detection unit, wherein the control unit controls a frequency of the demodulated signal. Is to change the frequency configuration of the plurality of local oscillators to an arbitrary frequency configuration without changing the frequency of the received signal before mixing by the mixer, and the communication quality is improved by the reception spurious detected by the spurious detection unit. The frequency configuration of the local oscillator mixed with any received signal having deteriorated By which is adapted to change the frequency arrangement, an effect that can generate a good demodulated signal quality with reduced any spurious received signal.

According to a fourteenth aspect of the present invention, there are provided a plurality of local oscillators for generating an oscillating signal, a mixer for mixing the oscillating signal of the local oscillator and outputting a demodulated signal, A spurious detecting section for detecting, a spurious attenuating section for attenuating the spurious of the demodulated signal at an arbitrary frequency under the control of the control section, and controlling the spurious attenuating section based on detection information from the spurious detecting section to control the spurious attenuating frequency. The spurious is reduced by the spurious attenuating means without changing the frequency configuration of the local oscillator mixed with an arbitrary received signal whose communication quality is degraded by the received spurious detected by the spurious detection unit. To reduce the spurious response of the received signal. An effect that can be generated had demodulated signal.

According to a fifteenth aspect of the present invention, the spurious attenuating means is a filter having a variable frequency characteristic for attenuating spurious of an arbitrary frequency. By using a filter that attenuates spurious signals, it is possible to generate a high-quality demodulated signal with reduced spurious of the received signal without changing the frequency configuration of the local oscillator, only by changing the frequency characteristics of the filter. It has the effect of being able to.

According to a sixteenth aspect of the present invention, there is provided the spurious reduction device according to the eleventh, twelfth, thirteenth, fourteenth, or fifteenth aspect, wherein a spurious of a received signal is reduced. Claim 11 12 13 14
Alternatively, the provision of the spurious reduction device according to 15 has an effect of obtaining a receiver capable of generating a high-quality reception signal with reduced reception spurious included in the reception signal.

Hereinafter, based on the attached drawings and FIGS. 1 to 9,
Embodiments 1 to 9 of the present invention will be described in detail. (Embodiment 1) First, a spurious reduction apparatus according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 1 of the present invention. In FIG. 1, 1 is a local oscillator, 2 is a local oscillator, 3
Is a mixer for outputting a transmission signal, and 4 is control means for controlling the frequency of the local oscillators 1 and 2. Note that the number of the local oscillators 1 and 2 is not limited to two, and any number of two or more local oscillators may be used.

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 1 of the present invention will be described. First, the mixer 3 converts the input modulation signal into local oscillators 1 and 2
The signal is mixed (mixed) by the output from the controller to generate a transmission signal. The control means 4 controls the local oscillator 1 and the local oscillator 1 so that the same transmission signal can be output without changing the frequency of the transmission signal for the transmission signal for which spurious is known to occur in the mixer output in advance. The transmission signal is generated by changing the frequency configuration of No. 2 to a predetermined different frequency configuration.

As described above, according to the first embodiment, the frequency configuration of the local oscillators 1 and 2 for a specific transmission signal that is known to cause spurious is controlled by the control means 4 so that the spurious is reduced. By changing to a different frequency configuration that is known not to occur, a transmission signal with reduced spurious can be generated.

(Embodiment 2) Next, referring to FIG.
A spurious reduction device according to Embodiment 2 of the present invention will be described. FIG. 2 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 2 of the present invention. In FIG. 2, 1 is a local oscillator, 2 is a local oscillator, 3 is a mixer for outputting a transmission signal, 4 is control means for controlling the frequency of the local oscillators 1 and 2, and 13 is a spurious detection unit for detecting spurious signals in the transmission signal. It is. Note that the number of the local oscillators 1 and 2 is not limited to two, and any number of two or more local oscillators may be used.

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 2 of the present invention will be described. First, the mixer 3 converts the input modulation signal into local oscillators 1 and 2
The transmission signal is generated by mixing (mixing) with the oscillating signal output from. The spurious detection unit 13 generates spurious detection information and sends it to the control unit 4 when the transmission signal generates transmission spurious. The control means 4 does not change the frequency of the transmission signal with respect to the transmission signal that generates spurious at an arbitrary mixer output, without changing the frequency of the transmission signal.
To be able to output the same transmission signal,
The frequency configuration of the local oscillators 1 and 2 is changed to a different frequency configuration.

As described above, according to the second embodiment, the control means 4 changes the frequency configuration of the local oscillators 1 and 2 to a different frequency configuration that does not generate spurious signals for an arbitrary transmission signal having generated spurious signals. By making the change, it is possible to generate a transmission signal with reduced spurious.

(Embodiment 3) Next, referring to FIG.
A spurious reduction device according to Embodiment 3 of the present invention will be described. FIG. 3 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 11 denotes a mixer for outputting a transmission signal, 12 denotes spurious attenuating means for attenuating arbitrary spurious signals, 13 denotes a spurious detecting unit for detecting spurious signals in the transmitting signal, and 14 denotes control means for controlling the spurious attenuating means 12. is there.

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 3 of the present invention will be described. First, the mixer 11 generates a transmission signal. Then, when the spurious detection unit 13 detects the occurrence of transmission spurious in the transmission signal, the spurious detection information is sent to the control unit 14, and the control unit 14 corresponds to the spurious signal for the transmission signal that generates spurious at an arbitrary mixer output. The signal is controlled to be attenuated by the spurious attenuation means 12. The mixer 11 according to the third embodiment may not be used for reducing transmission spurious, but may be used for modulating a transmission signal. Further, the spurious attenuating means 12 may include a notch filter having a variable frequency band pass or band rejection function using a passive element circuit including a resistor, a capacitor, or the like, or may use a digital filter.

As described above, according to the third embodiment, for an arbitrary transmission signal in which spurious has occurred,
By causing the generated spurious signal to be attenuated by the spurious attenuation unit 12 under the control of the control unit 14, a transmission signal with effectively reduced spurious can be generated.

(Embodiment 4) Next, referring to FIG.
A spurious reduction device according to Embodiment 4 of the present invention will be described. FIG. 4 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 4 of the present invention. In FIG. 4, reference numeral 11 denotes a mixer that outputs a transmission signal, 12 denotes a spurious attenuation unit that has a plurality of filters and attenuates arbitrary spurious components, 13 denotes a spurious detection unit that detects spurious components of the transmission signal, and 14 denotes a spurious attenuation unit 12. Control means for controlling the

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 4 of the present invention will be described. First, the mixer 11 generates a transmission signal. When the spurious detection of the transmission signal is detected by the spurious detection unit 13, the detection information is sent to the control unit 14. The control means 14 controls the spurious attenuating means 12 for a transmission signal which generates spurious at an arbitrary mixer output, and switches a switch (SW) from among a plurality of filters connected in parallel in the spurious attenuating means 12. Then, a filter effective for the frequency of the transmission signal corresponding to the spurious is selected to control the spurious to be attenuated.

As described above, according to the fourth embodiment, for an arbitrary transmission signal in which spurious has occurred,
Under the control of the control means 14, the generated spurious signal is attenuated by the spurious attenuating means 12 having a plurality of filters connected in parallel.
A transmission signal with reduced spurious can be generated.

(Embodiment 5) Next, referring to FIG.
A spurious reduction device according to Embodiment 5 of the present invention will be described. FIG. 5 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 5 of the present invention. In FIG. 5, 11 is a mixer for outputting a transmission signal, 12 is a spurious attenuating means having a filter 38 connected in series and attenuating any spurious, 13 is a spurious detection unit for detecting spurious of the transmission signal, and 14 is a spurious signal Control means for controlling the attenuating means 12, 38 are filters connected in series, 39 is a bypass circuit for bypassing each filter 38 connected in series, and 40 is switching means for switching between each filter 38 and the bypass circuit 39. Switch (SW).

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 5 of the present invention will be described. First, the mixer 11 generates a transmission signal. When the spurious detection of the transmission signal is detected by the spurious detection unit 13, the detection information is sent to the control unit 14. The spurious attenuating means 12 includes one or more filters 38 having different attenuation bands connected in series via a switch 40, and a bypass circuit 39 is connected in parallel to each filter 38, and the filter 38 is selected by the switch 40. Alternatively, the bypass circuit 39 can be selected, and an arbitrary spurious can be removed by the combination. The control means 14 controls the spurious attenuating means 12 for a transmission signal that generates spurious from an arbitrary mixer output, and switches a series-connected filter 38 in the spurious attenuating means 12 by a switch 40 to transmit a signal corresponding to the spurious. By passing the signal through the required filter 38 and circulating through the filter 38 until the required amount of attenuation is achieved, control can be provided to attenuate spurious. Although the filters 38 are connected in series in the fifth embodiment, the filters 38 may be connected in parallel and connected in series.

As described above, according to the fifth embodiment, the spurious is attenuated by passing the filter a required number of times through the filter under the control of the control means 14 for an arbitrary transmission signal in which the spurious has occurred. As a result, a transmission signal with reduced spurious can be generated.

(Embodiment 6) Next, referring to FIG.
A spurious reduction apparatus according to Embodiment 6 of the present invention will be described. FIG. 6 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 6 of the present invention. 6, reference numeral 11 denotes a mixer for outputting a transmission signal, 12 denotes spurious attenuation means for attenuating arbitrary spurious signals, 13 denotes a spurious detection unit for detecting spurious signals in the transmission signal, and 14 denotes control means for controlling the spurious attenuation means 12. is there. Further, in the spurious attenuating means 12, 5 is a divider for dividing the transmission signal into two under the control of the control means 14, 6 is a filter for attenuating the transmission signal, and 7 is a phase shifter for inverting the phase of the signal from the filter 6 by 180 degrees. ,
8 is an amplifier, 9 is to reduce or remove the transmission signal and set the phase to 1
This is a combiner that combines the signal from the amplifier 8 having the transmission spurious inverted by 80 degrees and the transmission signal that has been distributed by the distributor 5.

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 6 of the present invention will be described. First, the mixer 11 generates a transmission signal. When the spurious detection of the transmission signal is detected by the spurious detection unit 13, the detection information is sent to the control unit 14. The control means 4 controls the spurious attenuating means 12 for a transmission signal which generates spurious at an arbitrary mixer output as follows. That is, the distributor 5 of the spurious attenuation means 12
Divides the input transmission signal into two transmission signals, attenuates the transmission signal by the filter 6 from only one of the divided signals, and changes the phase of the signal whose transmission signal has been attenuated by the filter 6 in the phase shifter 7. By inverting the output signal and controlling the output level in the amplifier 8 and combining the output signal with the other transmission signal distributed by the distributor 5 in the coupler 9, a transmission signal in which spurious components are canceled and attenuated is output. . In the above description, the signal whose transmission signal is attenuated is inverted, but the signal whose transmission signal is not attenuated may be inverted.

As described above, according to the sixth embodiment, an arbitrary transmission signal in which a spurious signal is generated is divided into two, and under the control of the control means 14, the transmission signal is attenuated from only one of the signals and the spurious signal is attenuated. Is inverted and the spurious is attenuated by combining the signal with the other signal, whereby a transmission signal with reduced spurious can be effectively generated.

(Embodiment 7) Next, referring to FIG.
A spurious reduction device according to Embodiment 7 of the present invention will be described. FIG. 7 is a block diagram showing a configuration of a device for reducing spurious components of a demodulator according to Embodiment 7 of the present invention. In FIG. 7, 1 is a local oscillator, 2 is a local oscillator, 23 is a mixer for demodulating a received signal, 24 is a mixer for demodulating a received signal, and 15 is a mixer for the local oscillators 1 and 2 without changing the frequency of the received signal. Control means for controlling the local oscillators 1 and 2 to change the frequency configuration to a plurality of frequency configurations by changing the frequency. Note that the number of the local oscillators 1 and 2 is not limited to two, and any number of two or more local oscillators may be used.

Next, the operation of the modulator spurious reduction apparatus according to Embodiment 7 of the present invention will be described. First, the received signal is mixed (mixed) with the oscillation signal of the local oscillator 1 in the mixer 23, and the mixed signal is mixed with the oscillation signal of the local oscillator 2 in the mixer 24 to generate a demodulated signal. that time,
The control unit 15 controls the frequency configuration of the oscillation signal of each of the local oscillators 1 and 2 under the control of the control unit 15 so that the same reception signal can be demodulated with respect to the reception signal in which spurious is known to occur in the mixer output in advance. Change to a different frequency configuration that is predetermined.

As described above, according to the seventh embodiment, the frequency configuration of the local oscillators 1 and 2 with respect to a specific reception signal that is known to generate spurious signals is controlled by the control means 15. By changing to a different frequency configuration that is known not to generate spurious signals, a received signal with reduced spurious can be generated.

Embodiment 8 Next, referring to FIG.
A spurious reduction apparatus according to Embodiment 8 of the present invention will be described. FIG. 8 is a block diagram illustrating a configuration of a spurious reduction device of a demodulator according to Embodiment 8 of the present invention. 8, 1 is a local oscillator, 2 is a local oscillator, 23 is a mixer for demodulating a received signal, 24 is a mixer for demodulating a received signal, and 15 is a mixer for the local oscillators 1 and 2 without changing the frequency of the received signal. Control means for controlling the frequency configuration of the local oscillators 1 and 2 to be changed to a plurality of frequency configurations by changing the frequency;
A spurious detection unit 16 detects spurious of the demodulated signal. Note that the number of the local oscillators 1 and 2 is not limited to two, and any number of two or more local oscillators may be used.

Next, the operation of the demodulator spurious reduction apparatus according to Embodiment 8 of the present invention will be described. First, the received signal is mixed (mixed) with the oscillation frequency of the local oscillator 1 in the mixer 23, and the mixed signal is mixed with the oscillation frequency of the local oscillator 2 in the mixer 24 to generate a demodulated signal. At this time, when the spurious detection unit 16 detects the occurrence of spurious in the demodulated signal, the spurious detection information is transmitted to the control unit 1.
5 is output. The control means 5 generates an arbitrary spurious by changing the oscillation frequency of each of the local oscillators 1 and 2 so as to be able to demodulate the received signal without changing the frequency of the received signal when receiving an arbitrary received signal in which spurious has occurred. A demodulated signal without spurious is output by changing to a different frequency configuration.

As described above, according to the eighth embodiment, the oscillating frequency of the local oscillators 1 and 2 is changed by the control of the control means 5 for the arbitrary received signal in which spurious is generated. By changing the configuration, it is possible to generate a received signal in which any spurious is reduced.

Embodiment 9 Next, referring to FIG.
A spurious reduction device according to Embodiment 9 of the present invention will be described. FIG. 9 is a block diagram showing a configuration of a device for reducing spurious components of a demodulator according to Embodiment 9 of the present invention. In FIG. 9, 1 is a local oscillator, 2 is a local oscillator, 23 is a mixer for demodulating a received signal, 24 is a mixer for demodulating a received signal, and 15 is filters 27 and 28.
Control means capable of controlling the amount of attenuation at any frequency, 16 a spurious detection unit for detecting spurious components of the demodulated signal, 27 a filter for attenuating spurious components at any frequency, and 28 attenuating spurious components at any frequency. Filter. Note that the filters 27 and 28 constitute spurious attenuation means.

Next, the operation of the demodulator spurious reduction apparatus according to Embodiment 9 of the present invention will be described. First, the received signal is mixed (mixed) with the oscillation frequency of the local oscillator 1 in the mixer 23, and the mixed signal is mixed with the oscillation frequency of the local oscillator 2 in the mixer 24 to generate a demodulated signal. At this time, when spurious is detected in the demodulated signal, the spurious detection unit 16 sends the detection information to the control unit 5, and the control unit 5 performs filtering 27, 28 on demodulation of any received signal in which spurious occurrence is detected. Is controlled so as to attenuate the spurious of the demodulated signal.

As described above, according to the ninth embodiment, the frequency characteristics of the filters 27 and 28 are changed under the control of the control means 5 for any spurious received signal. Accordingly, it is possible to generate a demodulated signal in which any spurious is reduced.

In each of the embodiments of the present invention described above, the spurious reduction device in the modulator of the transmitter and the spurious reduction device in the demodulator of the receiver have been described. It can be easily applied to any other transmitters and receivers.

[0054]

According to the present invention, the frequency of the local oscillator which is mixed with the transmission signal under the control of the control means for the transmission signal which is known in advance to be spurious at the output of the mixer is constructed as described above. Is changed to a different frequency configuration, it is possible to generate a high-quality transmission signal with reduced spurious.

According to the present invention, the frequency of the local oscillator mixed with the transmission signal is changed to a different frequency configuration under the control of the control means, particularly for a transmission signal for which it is known in advance that spurious signals occur in the mixer output. As a result, it is possible to generate a high-quality transmission signal in which spurious signals that are known in advance are reduced.

According to the present invention, in particular, by detecting an arbitrary transmission spurious from a transmission signal and changing the frequency of a local oscillator mixed with the transmission signal to an arbitrary different frequency configuration under the control of the control means, It is possible to generate a high quality transmission signal in which any spurious is reduced.

According to the present invention, in particular, an arbitrary transmission spurious is detected from the transmission signal, and the transmission spurious is reduced by the spurious reduction means under the control of the control means without changing the frequency configuration for generating the transmission signal. This makes it possible to generate a high-quality transmission signal with reduced spurious.

According to the present invention, in particular, the frequency of a local oscillator mixed with a received signal or a received signal in which spurious is generated due to an interfering wave mixed into the local oscillator is changed to a different frequency configuration under the control of the control means. As a result, it is possible to generate a high-quality demodulated signal with reduced spurious of the received signal.

According to the present invention, in particular, the frequency of a local oscillator mixed with a received signal, which is known in advance to generate spurious signals at the mixer output due to an interfering wave mixed into the received signal or the local oscillator, is controlled by the control means. By changing the frequency configuration to a different frequency configuration, it is possible to generate a high-quality demodulated signal in which the spurious of the received signal that is known in advance is reduced.

According to the present invention, the frequency of the local oscillator mixed with an arbitrary received signal whose speech quality is deteriorated due to the reception spurious detected by the spurious detection unit is changed to a different frequency configuration under the control of the control means. This makes it possible to generate a high-quality demodulated signal with reduced spurious of the received signal.

According to the present invention, the reception spurious is reduced by the spurious attenuating means without changing the frequency configuration of the local oscillator mixed with an arbitrary reception signal whose speech quality is deteriorated by the reception spurious detected by the spurious detection unit. With this configuration, it is possible to generate a high-quality demodulated signal with reduced spurious of the received signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 1 of the present invention;

FIG. 2 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 2 of the present invention;

FIG. 3 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 3 of the present invention;

FIG. 4 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 4 of the present invention;

FIG. 5 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 5 of the present invention;

FIG. 6 is a block diagram showing a configuration of a modulator spurious reduction apparatus according to Embodiment 6 of the present invention;

FIG. 7 is a block diagram showing the configuration of a demodulator spurious reduction apparatus according to Embodiment 7 of the present invention;

FIG. 8 is a block diagram showing a configuration of a demodulator spurious reduction apparatus according to Embodiment 8 of the present invention;

FIG. 9 is a block diagram showing a configuration of a demodulator spurious reduction apparatus according to Embodiment 9 of the present invention;

FIG. 10 is a block diagram showing a configuration of a conventional spurious reduction device in a modulation / demodulation device.

[Explanation of symbols]

 1, 2 Local oscillator 3, 11 Mixer 4, 14, 15 Control means 5 Distributor 6, 27, 28 Filter 7 Phaser 8 Amplifier 9 Coupler 12 Spurious attenuation means 13 Spurious detection unit 23, 24 Mixer 31 Control means 33, 34 local oscillator 35, 36, 37 mixer 38 filter 39 bypass circuit 40 switching means (switch)

Claims (16)

[Claims] 1. A plurality of local oscillators that mix to form a frequency of a transmission signal, a mixer that mixes an input signal and a frequency of the local oscillator to generate a transmission signal, and a frequency configuration of the plurality of local oscillators Control means for controlling to change the frequency configuration of the plurality of local oscillators without changing the frequency of the transmission signal before changing the frequency of the input signal before mixing by the mixer. A spurious reduction device characterized by the above-mentioned. 2. The spurious reduction apparatus according to claim 1, wherein a frequency configuration of said plurality of local oscillators is changed to a frequency different from a predetermined frequency. 3. A plurality of local oscillators that mix to form a frequency of a transmission signal, a mixer that mixes an input signal and a frequency of the local oscillator to generate a transmission signal, and detects transmission spurious in the transmission signal. A spurious detection unit, and control means for controlling the frequency configuration of the plurality of local oscillators to be changed to an arbitrary frequency configuration based on spurious detection information from the spurious detection unit,
The spurious reduction wherein the control means changes the frequency configuration of the plurality of local oscillators to an arbitrary frequency configuration without changing the frequency of the transmission signal before changing the frequency of the input signal before mixing by the mixer. apparatus. 4. A mixer for generating a transmission signal, a spurious detection unit for detecting a transmission spurious in the transmission signal, a spurious attenuation unit for attenuating a transmission spurious of an arbitrary frequency in the transmission signal from the mixer, and the spurious detection. Control means for controlling the spurious damping means based on spurious detection information from the section. 5. The spurious reduction apparatus according to claim 4, wherein said spurious attenuation means includes a notch filter using a passive element circuit. 6. The spurious reduction apparatus according to claim 4, wherein said spurious attenuation means includes a digital filter. 7. A mixer for generating a transmission signal, a spurious detection unit for detecting a transmission spurious in the transmission signal, a spurious attenuation unit for attenuating the transmission spurious at a plurality of frequencies in the transmission signal from the mixer, and the spurious detection. Control means for controlling the spurious attenuation means based on spurious detection information from the section, wherein the spurious attenuation means includes switching means for connecting filters having different attenuation bands in parallel and switching the filters. Reduction device. 8. A mixer for generating a transmission signal, a spurious detection unit for detecting a transmission spurious in the transmission signal, a spurious attenuation unit for attenuating the transmission spurious at a plurality of frequencies in the transmission signal from the mixer, and the spurious detection. Control means for controlling the spurious damping means based on spurious detection information from the section, wherein the spurious damping means are connected in series and have different attenuation bands.
A spurious reduction apparatus comprising: the above filter; a bypass circuit that bypasses the filter; and a switching unit that switches between the filter and the bypass circuit. 9. The spurious attenuating means includes a divider for dividing the transmission signal output from the mixer into two, a filter for removing the transmission signal from the signal from the distributor, and a phase inversion of the signal from the filter. And a combiner that combines the output of the phase shifter and the other transmission signal distributed by the distributor, and combines the signal whose phase is inverted and the signal whose phase is not inverted in the combiner. 5. The spurious reduction device according to claim 4, wherein: 10. The method of claim 1, 2, 3, 4, 5, 6, 7, or 8.
Or a transmitter including the spurious reduction apparatus according to 9 above, wherein transmission spurious included in a transmission signal is reduced. 11. A plurality of local oscillators for generating an oscillating signal, a mixer for mixing the oscillating signal of the local oscillator and outputting a demodulated signal, and control means for controlling a frequency configuration of the plurality of local oscillators to be changed. With
The spurious reduction apparatus, wherein the control means changes the frequency configuration of the plurality of local oscillators without changing the frequency of the demodulated signal before changing the frequency of the received signal before mixing by the mixer. 12. The spurious reduction apparatus according to claim 11, wherein a frequency configuration of said plurality of local oscillators is changed to a frequency different from a predetermined frequency. 13. A spurious signal generator comprising: a plurality of local oscillators for generating an oscillating signal; a mixer for mixing the oscillating signal of the local oscillator to output a demodulated signal; a spurious detecting unit for detecting spurious in the demodulated signal; Control means for controlling the frequency configuration of the plurality of local oscillators to an arbitrary frequency configuration based on the detection information from the section, wherein the control means adjusts the frequency of the demodulated signal to the reception signal before mixing by the mixer. A spurious reduction apparatus characterized in that the frequency configuration of the plurality of local oscillators is changed to an arbitrary frequency configuration without changing the frequency. 14. A local oscillator for generating an oscillating signal, a mixer for mixing the oscillating signal of the local oscillator and outputting a demodulated signal, a spurious detecting section for detecting spurious in the demodulated signal, A spurious attenuating means for attenuating spurious of the demodulated signal at an arbitrary frequency by control; and a controlling means for controlling the spurious attenuating means based on detection information from the spurious detecting unit to reduce spurious at an arbitrary frequency. A spurious reduction device comprising: 15. The spurious reduction apparatus according to claim 14, wherein said spurious attenuation means is a filter having a variable frequency characteristic for attenuating spurious of an arbitrary frequency. 16. The method of claim 11, 12, 13, 14 or 1.
A receiver comprising the spurious reduction device according to claim 5, wherein the spurious of a received signal is reduced.