JP2003032148A - Signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal processor that converts a broadband reception signal into an intermediate signal so as to attain processing such as analog/ digital conversion. SOLUTION: A processing object signal is a signal with any of frequencies F1, F2, F3, to Fn. A local signal is a set of signals with frequencies f1', f2', f3', to fn'. An analog/digital converter can apply analog/digital conversion to the signal with the frequency f1. The difference between the frequency (e.g. F3) of the processing object signal and any frequency (e.g. f3') of the local signals is f1. Thus, even when the band of the prescribed object signal extends over a broadband, the processing object signal is mixed with the local signal to obtain an intermediate frequency signal(IF signal) to allow the analog/digital converter to be capable of analog/digital conversion.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD This invention relates to the analysis of frequency hopping (FHS) signals.

[0002]

2. Description of the Related Art Conventionally, frequency hopping (FHS) communication signals have been measured in which communication is performed while changing frequencies one after another. FIG. 7 shows the configuration of a communication signal measuring device of a wideband frequency hopping system in the related art.

From the antenna 102 of the transmitter 100, a communication signal of a wide band frequency hopping system is transmitted by RF (radio fr
frequency) signal to the measuring device 300. The frequency of the transmitted signal is in the band from F1 to Fn.
The transmitted signal is received by the antenna 302.
The signal received by antenna 302 is transmitted to amplifier 304.
Is mixed with the local signal (frequency fLo) generated by the local oscillator 306 by the mixer 308.
The mixed signal is used as an IF (intermediate frequency) signal as a filter 310, an amplifier 312, and a filter 3.
It is input to the A / D converter 316 via 14. IF
The signal frequency ranges from f1 (= F1-fLo) to fn (= Fn-f)
It is in the band until Lo). The A / D converter 316 A / D converts the input IF signal and outputs it as a digital signal. The communication signal is measured by analyzing the digital signal. FIG. 8 shows the relationship between the frequency and the level of the RF signal, the local signal, and the IF signal.

[0004]

However, the A / D
The frequency band of the input signal that the converter 316 can handle is fAD.
Then, generally, fAD <fn-f1 (= Fn-F1). Therefore, the communication signal cannot be measured.

Therefore, according to the present invention, a wideband received signal is
An object of the present invention is to provide a signal processing device or the like that converts an intermediate signal so that processing such as / D conversion can be performed.

[0006]

According to a first aspect of the present invention, there is provided a processing target signal output means for outputting a processing target signal having a frequency of any one of channel frequencies having a predetermined interval within a predetermined band. A local signal output means for outputting a local signal having a frequency of an integer multiple of a predetermined interval, a processing target signal mixing means for mixing and outputting the processing target signal and the local signal, and a frequency of the processing target signal. Signal processing means capable of processing an intermediate frequency signal having a frequency based on a difference from any one of the local signals.

According to the signal processing device configured as described above, the signal processing means processes the intermediate frequency signal having a frequency based on the difference between the frequency of the signal to be processed and one of the frequencies of the local signal. it can. Therefore, even if the band of the signal to be processed is wide, it can be processed by the signal processing means by mixing with the local signal.

A second aspect of the invention is the invention according to the first aspect, wherein the signal to be processed is a received signal, and the signal processing means is an A / D converter for converting the intermediate frequency signal into a digital signal. Configured to be a means.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the local signal output means includes reference signal output means for outputting a reference signal of a predetermined frequency,
It is configured to include interval signal output means for outputting an interval signal having a frequency that is an integral multiple of the interval of the frequency of the local signal, and reference signal mixing means for mixing and outputting the reference signal and the interval signal.

The invention according to claim 4 is the invention according to claim 1 or 2, wherein the local signal output means includes reference signal output means for outputting a reference signal of a predetermined frequency,
And a frequency multiplication means for outputting a signal obtained by multiplying the frequency of the reference signal by an integer.

The invention according to claim 5 is the invention according to claim 1 or 2, wherein the processing target signal output means is P
(P is an integer of 2 or more), and the local signal output means is P × Q times the predetermined interval (Q is an integer of 1 or more).
And outputs P local signals that are shifted from each other by Q times a predetermined interval.

Since the interval between the local signals can be set wider than a predetermined interval, it is easy to remove noise such as an image from the local signal.

The invention as set forth in claim 6 is the invention as set forth in claim 5, wherein reference signal output means for outputting P reference signals deviated from each other by Q times of a predetermined interval, and a predetermined number. It is configured to include interval signal output means for outputting an interval signal having a frequency having an interval of P × Q times the interval, and reference signal mixing means for mixing and outputting the reference signal and the interval signal.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a block diagram showing the configuration of a signal processing device 1 according to the first embodiment of the present invention. The signal processing device 1 according to the first embodiment of the present invention receives and processes an RF signal transmitted from the transmission device 60 via the antenna 62. From the antenna 62 of the transmitter 60, a broadband frequency hopping communication signal is transmitted as an RF (radio frequency) signal. As a communication standard, Blueto
There are oth etc.

The signal processing apparatus 1 includes an antenna 12, an amplifier 14, a filter 16, a local signal generator (local signal output means) 20, a filter 32, a mixer (processing target signal mixing means) 34, a filter 36, a local oscillator 38. , Mixer 40, filter 42, amplifier 44, filter 46, A /
A D converter (signal processing means) 48 and a signal analysis unit 50 are provided.

The antenna 12 receives the RF signal transmitted from the transmitter 60. The amplifier 14 amplifies the received RF signal. The filter 16 performs band limiting processing on the output of the amplifier 14 and outputs it. The signal output from the filter 16 is a processing target signal that is a processing target of the signal processing device 1. That is, the antenna 12, the amplifier 14, and the filter 16 correspond to processing target signal output means for outputting a processing target signal.

The frequency of the signal to be processed will be described with reference to FIG. The signal to be processed is within a predetermined band (F1
To Fn), any one of channel frequencies F1, F2, F3, ... Fn having a predetermined interval Δf.
Note that F2-F1 = F3-F2 = ... = Fn-Fn-1 = [Delta] f. The frequency of the signal to be processed changes with time. For example, the frequency changes such that it is F3 at a certain time point and Fn after a unit time.

Local signal generator (local signal output means)
20 is a frequency (Δ) at an interval that is an integral multiple of the predetermined interval Δf.
f), 2Δf, 3Δf ...) are output. The frequency of the local signal will be described with reference to FIG. The frequencies of the local signals are frequencies f1 ′, f2 ′, f3 ′, ... Fn ′ having a predetermined interval Δf. That is,
A set of signals having frequencies f1 ′, f2 ′, f3 ′, ... Fn ′ is a local signal. Note that f2'-f1 '= f3'-f2' = ... =
fn′−fn−1 ′ = Δf (or 2Δf, 3Δf ... May be used).

There are, for example, two types of configurations of the local signal generating section 20, which are shown in FIGS. 2 (a) and 2 (b), respectively. Figure 2
With reference to (a), the local signal generator 20 includes a reference signal oscillator 210, an interval signal oscillator 220, an amplifier 222, a filter 224, a mixer (reference signal mixing means) 230, a filter 232, and an amplifier 234.

The reference signal oscillator 210 has a predetermined frequency f.
Output 1'reference signal. The interval signal oscillator 220 is
Frequency (n of integer multiples of the interval Δf of the frequency of the local signal)
Δf: However, the interval signal having n = 0, 1, 2, ...) Is output.

The amplifier 222 amplifies the interval signal. The filter 224 band-limits the output of the amplifier 222 and outputs it.

The mixer (reference signal mixing means) 230 mixes and outputs the reference signal output from the reference signal oscillator 210 and the interval signal output from the interval signal oscillator 220 via the amplifier 222 and the filter 224. .

The filter 232 band-limits the output of the mixer 230 and outputs it. The amplifier 234 uses the filter 23.
Amplify the output of 2. The frequency of the output of the amplifier 234 is
f1 ′ + nΔf (where n = 0, 1, 2, ...) If n = 0, 2, 4, ..., The frequency interval of the local signal can be set to 2Δf. If n = 0, 3, 6, ...
The frequency interval of the local signal can be set to 3Δf. In this way, the frequency interval of the local signal is reduced to the predetermined interval Δ.
Frequency at intervals of integral multiples of f (Δf, 2Δf, 3Δf ...)
You can

FIG. 2B shows a configuration example of still another local signal generating section 20. Referring to FIG. 2B, the local signal generator 20 includes a reference signal oscillator 210 and an SRD (step r).
ecovery diode) (frequency multiplication means) 240, amplifier 2
42, a filter 246, and a filter 248.

The reference signal oscillator 210 has a predetermined frequency f.
Output 1'reference signal. SRD (step recovery dio
de) (frequency multiplication means) 240 has a frequency (nf1 ′: where n = 0, 1, 2, ...) That is an integral multiple of the frequency of the reference signal.
To output a signal having The amplifier 242 is the SRD24.
Amplifies the output of 0. The filter 246 is the amplifier 242.
The output of is band-limited and output. The amplifier 248 amplifies the output of the filter 246. The frequency of the output of the amplifier 248 is nf1 ′ (n = 0, 1, 2, ...). here,
If f1 ′ = Δf, the frequency interval of the local signal can be set to a predetermined interval Δf.

Returning to FIG. 1, the filter 32 performs band limiting processing on the output of the local signal generator 20 and outputs it.

The mixer (processing target signal mixing means) 34 is
The signal to be processed and the local signal are mixed and output. The filter 36 performs band limiting processing on the output of the mixer 34 and outputs the result. The frequency of the output of the filter 36 is the difference between the frequency of the signal to be processed and the frequency of the local signal.

The local oscillator 38 generates a signal having a predetermined frequency. The mixer 40 mixes the output of the filter 36 and the output of the local oscillator 38 and outputs the mixed output. Filter 42
Performs band limitation processing on the output of the mixer 40 and outputs the result. The frequency of the output of the filter 42 is the difference between the frequency of the output of the filter 36 and the frequency of the output of the local oscillator 38. However, the local oscillator 38, the mixer 40 and the filter 42 may be omitted. If omitted, amplifier 44
Is the output of the filter 36.

The amplifier 44 amplifies the output of the filter 42 or the output of the filter 36. The filter 46 performs band limiting processing on the output of the amplifier 44 and outputs it to the A / D converter 48.

The A / D converter 48 can handle an intermediate frequency signal (IF signal) having a frequency based on the difference between the frequency of the signal to be processed and any one of the local signals. For example, it can correspond to an intermediate frequency signal in which the frequency of the signal to be processed is F1 and which has a frequency difference f1 with the frequency of the signal having the frequency f1 ′ of the local signal (see FIG. 3).
(See (a) and (b)). That is, the frequency f1 is included in the band (width fAD) that can be input to the A / D converter 48. A /
The D converter 48 converts the intermediate frequency signal into a digital signal and outputs the digital signal to the signal analysis unit 50. The signal analysis unit 50 analyzes the input digital signal.

Next, the operation of the first embodiment will be described with reference to FIG.

From the antenna 62 of the transmitter 60, a communication signal of a wide band frequency hopping system is transmitted by RF (radio freque).
ncy) signal is transmitted to the signal processing device 1. The transmitted signal is received by the antenna 12. The signal received by the antenna 12 is amplified by the amplifier 14, band-limited by the filter 16, and output to the mixer 34. The processing target signal output by the filter 16 is
It is a signal of any frequency among F1, F2, F3, ... Fn as shown in FIG. For example, as shown in FIG. 3B, the processing target signal is a signal having a frequency of F3 at a certain time. In addition, the signal output from the local signal generation unit 20 is passed through the filter 32 as a local signal to the mixer 34.
Is output to. The local signal is an aggregate of signals having frequencies f1 ′, f2 ′, f3 ′, ... Fn ′ as shown in FIG. Here, it is assumed that F1-f1 '= F2-f2' = ... = f1. Further, it is assumed that the signal to be processed is a signal having a frequency of F3 at a certain point of time.

The mixer 34 mixes the signal to be processed and the local signal and outputs the mixed signal. IF which is the output at this time
The frequency of the (intermediate frequency) signal is the difference between the frequency of the signal to be processed and the frequency of the local signal. I
The frequency of the F signal is, as shown in FIG.
Δf, f1 (corresponding to the frequency f3 'of the local signal), f1 + Δ
f (corresponding to f2 ′) and f1 + 2Δf (corresponding to f1 ′).
Thus, the difference between the frequency of the signal to be processed and the frequency of the local signal is f1. If the signal to be processed has a frequency of F2, the difference from the frequency f2 ′ of the local signal is f1. If the signal to be processed has a frequency of Fn, the difference from the frequency fn 'of the local signal is f1. Although the frequency of the local signal is smaller than the frequency of the signal to be processed in FIG.
As shown in (c), the frequency of the local signal may be higher than the frequency of the signal to be processed.

The output of the mixer 34 is input to the A / D converter 48 via the filter 36, the amplifier 44 and the filter 46. Bandwidth that can be input to A / D converter 48 (width fAD)
Since frequency f1 is included in (see Fig. 3 (b)), A /
The D converter 48 can convert the intermediate frequency signal (IF signal) into a digital signal. The signal analysis unit 50 analyzes the input digital signal.

According to the first embodiment, the A / D converter 4
8 can A / D convert a signal having a frequency f1. Moreover, the difference between the frequency of the signal to be processed (eg, F3) and the frequency of any of the local signals (eg, f3 ′) is f1.
Therefore, even if the processing target signal has a wide band, the A / D converter 48 can perform A / D conversion by mixing with the local signal to form an intermediate frequency signal (IF signal).

Second Embodiment The second embodiment is different from the first embodiment in that local signals are interleaved.

FIG. 4 is a block diagram showing the configuration of the signal processing apparatus 1 according to the second embodiment of the present invention. The signal processing device 1 according to the second embodiment of the present invention receives and processes the RF signal transmitted from the transmission device 60 via the antenna 62. From the antenna 62 of the transmitter 60, a communication signal of a wide band frequency hopping system is transmitted by RF (radio freq).
uency) signal. Note that there are Bluetooth and the like as communication standards.

The signal processing apparatus 1 includes an antenna 12, an amplifier 14, filters 16a and 16b, a local signal generator (local signal output means) 20, a mixer (processing target signal mixing means).
34a, b, filters 36a, b, amplifiers 44a, b,
The filters 46a and 46b, the adder 47, the A / D converter (signal processing means) 48, and the signal analysis unit 50 are provided.

The antenna 12 receives the RF signal transmitted from the transmitter 60. The amplifier 14 amplifies the received RF signal. The filters 16a and 16b perform band limitation processing on the output of the amplifier 14 and output it. Filter 16a,
The signal output by b is a processing target signal that is a processing target of the signal processing device 1. That is, the antenna 12 and the amplifier 1
4 and the filters 16a and 16b correspond to processing target signal output means for outputting a processing target signal. However, unlike the first embodiment, it has the same two outputs. It should be noted that the number of outputs may be two or more, and in general, P (P
Has an output of 2 or more). The frequency of the signal to be processed is the same as in the first embodiment (see FIG. 3 (a)).

Local signal generator (local signal output means)
The reference numeral 20 outputs a local signal having a frequency of P × Q times the predetermined interval Δf (Q is an integer of 1 or more). The configuration of the local signal generation unit (local signal output means) 20 will be described with reference to FIG. In the example shown in FIG. 5, P = 2 and Q =
1 is assumed.

With reference to FIG. 5A, the local signal generator 2
0 is the reference signal oscillators 212 and 214, the interval signal oscillator 221, the amplifier 222, the filters 224a and 224b, the mixers (reference signal mixing means) 230a and 230b, and the filter 232.
It has a and b and amplifiers 234a and 234b.

The reference signal oscillator 212 has a predetermined frequency f.
Output 1'reference signal. The reference signal oscillator 214 is
A reference signal of a predetermined frequency f2 '(= f1' + QΔf = f1 '+ Δf) is output. That is, the frequency of the reference signal output from the reference signal oscillator 212 and the frequency of the reference signal output from the reference signal oscillator 214 are Q (=
1) Deviated by a factor of 2. The interval signal oscillator 221 outputs an interval signal having a frequency (2nΔf: where n = 0, 1, 2, ...) That is an integral multiple of 2Δf, which is P × Q times the frequency interval of the local signal.

The amplifier 222 amplifies the interval signal. The filters 224a and 224 band-limit the output of the amplifier 222 and output it.

The mixer (reference signal mixing means) 230a is
The reference signal output from the reference signal oscillator 212, the interval signal oscillator 221, the amplifier 222, and the filter 224a.
And outputs the mixed signal with the interval signal output via. The mixer (reference signal mixing means) 230b mixes and outputs the reference signal output from the reference signal oscillator 214 and the interval signal output from the interval signal oscillator 221 via the amplifier 222 and the filter 224b.

The filters 232a and 232b are the mixer 230.
The outputs of a and b are band-limited and output. Amplifier 234
The a and b amplify the outputs of the filters 232a and 232b. The frequency of the output of the amplifier 234a becomes fLo1 and the amplifier 23
The frequency of the 4b output becomes fLo2. The output of the amplifier 234a is given to the mixer 34a, and the output of the amplifier 234b is given to the mixer 34b.

FIG. 5B shows the frequency fLo1 of the output of the amplifier 234a and the frequency fLo2 of the output of the amplifier 234b. fLo1 is f1 ′ + 2nΔf (where n = 0, 1, 2
…) fLo2 is f2 '+ 2nΔf (where n =
0, 1, 2 ...). fLo1 and fLo2 have a predetermined interval Δf
It is deviated by Q (= 1) times. Further, both the frequency fLo1 and the frequency fLo2 have a predetermined interval Δf of P × Q.
(= 2 × 1 = 2) times.

Therefore, if fLo1 and fLo2 are combined, the frequency of the local signal of the first embodiment (see FIG. 3A).
Will be similar to. As described above, since the frequencies are divided into fLo1 and fLo2, the frequency interval in each local signal is wider than Δf, for example, 2Δf, and noise such as an image in each local signal can be easily removed.

Mixer (processing target signal mixing means) 34a,
In b, the signal to be processed and the local signal are mixed and output. The filters 36a and 36b perform band limitation processing on the outputs of the mixers 34a and 34b and output the result. Filters 36a, b
The frequency of the output of is the difference between the frequency of the signal to be processed and the frequency of the local signal.

The amplifiers 44a and 44b include filters 36a and 36b.
Amplifies the output of. The filters 46a and 46b are the amplifier 44.
Band limiting processing is performed on the outputs of a and b, and the results are output to the adder 47. The adder 47 adds the outputs of the filters 46 a and 46 b and outputs the result to the A / D converter 48.

The A / D converter 48 and the signal analysis unit 50 are the same as those in the first embodiment.

Next, the operation of the second embodiment will be described with reference to FIG.

From the antenna 62 of the transmitter 60, a communication signal of wide band frequency hopping system is transmitted by RF (radio freque).
ncy) signal is transmitted to the signal processing device 1. The transmitted signal is received by the antenna 12. The signal received by the antenna 12 is amplified by the amplifier 14, band-limited by the filter 16, and output to the mixer 34. The processing target signal output by the filter 16 is
It is a signal of any frequency among F1, F2, F3, ... Fn as shown in FIG. For example, as shown in FIG. 6B, the signal to be processed is a signal having a frequency of F3 at a certain time. In addition, the signal output from the local signal generation unit 20 is passed through the filter 32 as a local signal to the mixer 34.
Is output to. As shown in FIG. 6A, the local signal is a set of signals having frequencies f1 ′, f3 ′, ... Fn ′ (a signal corresponding to fLo1) and a set of signals having frequencies f2 ′, f4 ′ ,.
signal corresponding to o2). Where F1−f1 ′ = F2−f
Set 2 '= ... = f1. Further, it is assumed that the signal to be processed is a signal having a frequency of F3 at a certain point of time.

The mixers 34a and 34b mix the signal to be processed and the local signal and output the mixed signal. The frequency of the IF (intermediate frequency) signal that is the output at this time is the difference between the frequency of the processing target signal and the frequency of the local signal. The frequency of the IF signal is, as shown in FIG. 6B, the frequency of the IF signal output from the mixer 34a, ..., F1-2.
Δf, f1 (corresponding to the frequency f3 'of the local signal), f1 + 2
Δf. The frequencies of the IF signal output from the mixer 34b are ..., F1−Δf, f1 + Δf. Thus, the difference between the frequency of the signal to be processed and the frequency of the local signal is f1. If the signal to be processed has a frequency of F2, the difference from the frequency f2 ′ of the local signal is f1. If the signal to be processed has a frequency of Fn, the difference from the frequency fn 'of the local signal is f1. Although the frequency of the local signal is lower than the frequency of the processing target signal in FIG. 6A, the frequency of the local signal may be higher than the frequency of the processing target signal.

The outputs of the mixers 34a and 34b are filtered by the filter 36.
It is input to the adder 47 via a, b, amplifiers 44a, b, and filters 46a, 46b. The adder 47 uses the filter 4
The outputs of 6a and 6b are added and input to the A / D converter 48. Since the frequency f1 is included in the band (width fAD) that can be input to the A / D converter 48 (see FIG. 6B), the intermediate frequency signal (IF signal) is converted to a digital signal by the A / D converter 48. it can. The signal analysis unit 50 analyzes the input digital signal.

According to the second embodiment, the same effect as the first embodiment can be obtained. Moreover, the frequency interval in each local signal output by the local signal generator 20 is 2Δf.
Therefore, it is easy to remove noise such as an image in each local signal.

[0057]

According to the present invention, the signal processing means can process an intermediate frequency signal having a frequency based on the difference between the frequency of the signal to be processed and one of the local signals. Therefore, even if the band of the signal to be processed is wide, it can be processed by the signal processing means by mixing with the local signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a signal processing device 1 according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a local signal generator 20.

FIG. 3 is a diagram showing the operation of the first embodiment, showing the frequency of the local signal and the frequency of the signal to be processed (FIG. 3A), the frequency of the IF signal, the frequency of the local signal, and the processing. FIG. 3 shows the frequency of the target signal (see FIG.
(B)) is a diagram (Fig. 3 (c)) showing a further example of the frequency of the local signal and the frequency of the signal to be processed.

FIG. 4 is a block diagram showing a configuration of a signal processing device 1 according to a second embodiment of the present invention.

FIG. 5 is a local signal generator (local signal output means) 20.
FIG. 5A is a diagram showing the configuration of FIG. 5A and FIG. 5B is a diagram showing frequencies of signals generated by the local signal generation unit (local signal output means) 20.

FIG. 6 is a diagram showing the operation of the second embodiment, showing the frequency of the local signal and the frequency of the signal to be processed (FIG. 6A), the frequency of the IF signal, the frequency of the local signal, and the processing. The figure which shows the frequency of a target signal (FIG.6 (b))
Is.

FIG. 7 is a block diagram showing a configuration of a communication signal measuring device of a wideband frequency hopping system according to a conventional technique.

FIG. 8: RF signal, local signal, I in the prior art
It is a figure which shows the frequency of F signal, and the relationship of a level.

[Explanation of symbols]

1 Signal processing device 12 antennas 14 amplifier 16 filters 16a, b filter 20 Local signal generator (local signal output means) 32 filters 34 mixer (processing target signal mixing means) 34a, b mixer (processing target signal mixing means) 36 filters 36a, b filter 38 Local oscillator 40 mixer 42 filters 44 amplifier 44a, b amplifier 46 filters 46a, b filter 47 adder 48 A / D converter (signal processing means) 50 Signal analysis unit

Claims (6)

[Claims] 1. A processing object signal output means for outputting a processing object signal having a frequency of any one of channel frequencies having a predetermined interval in a predetermined band, and a frequency having an integer multiple interval of the predetermined interval. Any one of a local signal output means for outputting a local signal to be taken, a processing target signal mixing means for mixing and outputting the processing target signal and the local signal, and a frequency of the processing target signal and the local signal A signal processing device comprising: a signal processing unit capable of processing an intermediate frequency signal having a frequency based on a difference from the frequency. 2. The signal processing device according to claim 1, wherein the signal to be processed is a received signal, and the signal processing means is A / D conversion means for converting the intermediate frequency signal into a digital signal. A signal processing device. 3. The signal processing device according to claim 1, wherein the local signal output means outputs a reference signal output means for outputting a reference signal having a predetermined frequency, and A signal processing device comprising: a spacing signal output means for outputting a spacing signal having an integral multiple frequency; and a reference signal mixing means for mixing and outputting the reference signal and the spacing signal. 4. The signal processing device according to claim 1, wherein the local signal output means outputs a reference signal output means for outputting a reference signal having a predetermined frequency, and an integer multiple of the reference signal frequency. A signal processing device comprising: a frequency multiplying unit that outputs the generated signal. 5. The signal processing device according to claim 1, wherein the processing target signal output unit has P outputs (P is an integer of 2 or more), and the local signal output unit is , P × Q at the predetermined interval
A signal processing device that takes frequencies at intervals of twice (Q is an integer of 1 or more) and outputs P local signals that are offset from each other by Q times the predetermined interval. 6. The signal processing device according to claim 5, wherein reference signal output means for outputting P reference signals that are shifted from each other by Q times the predetermined interval, and P at the predetermined interval. A signal processing apparatus comprising: a spacing signal output means for outputting a spacing signal having a frequency of × Q times the spacing; and a reference signal mixing means for mixing and outputting the reference signal and the spacing signal.