JP6453641B2 - Frequency conversion device, transmission device, frequency conversion method, and frequency conversion program - Google Patents

Description

  The present invention relates to a frequency conversion device, a transmission device, a frequency conversion method, and a frequency conversion program, and more particularly to a frequency conversion device, a transmission device, a frequency conversion method, and a frequency conversion program for converting a carrier frequency.

  As the frequency conversion device, there is a frequency shift unit included in the wireless communication device described in Patent Document 1. In Patent Document 1, on the transmission side, in-phase and quadrature components for predetermined modulation are generated according to a transmission bitstream, and frequency shift of the in-phase and quadrature components is performed by a frequency shift unit. 2πΔft) and cos (2πΔft) are disclosed (Δf is a frequency to be shifted).

Japanese Patent Laid-Open No. 9-233044

  In the above-mentioned Patent Document 1, in order to obtain sin (2πΔft) and cos (2πΔft) for a desired frequency Δf, there is a method of creating a sin table and a cos table in advance in a memory and reading out data with respect to time as necessary. Conceivable.

  However, when each wave table of the sin table and the cos table is mounted on the circuit as it is, a memory capacity to be used is required for the number of types of the required tables. Further, if the sampling frequency is increased in order to reproduce a high-quality waveform, the required memory capacity increases. For example, when the sampling frequency is doubled, the amount of memory used per table is also doubled. Such an increase in memory capacity directly leads to an increase in cost and power consumption.

Further, when the circuit scale increases, it becomes impossible to reduce the performance due to an increase in delay or to implement a cheaper FPGA (Field-Programmable Gate Array).
[Object of invention]
An object of the present invention is to reduce the circuit scale of a frequency conversion device that converts a carrier frequency, to reduce the power consumption of the circuit, and to improve the ease of maintenance.

  The frequency converter according to the present invention selects two values respectively corresponding to two rotating phases that are orthogonal to each other from a sine wave table that outputs a value for each phase of a sine wave, and selects the two selected A frequency conversion device that converts the frequency of an input signal using a value.

  The frequency converter according to the present invention also includes two values corresponding to two rotating normal and quadrature phases that are orthogonal to each other, and a negative phase from a sine wave table that outputs a value for each phase of the sine wave. And a frequency corresponding to the first input signal is converted using the selected two values, and a second value is used using the value corresponding to the quadrature phase and the value corresponding to the opposite phase. A frequency conversion device that converts the frequency of an input signal.

  The frequency conversion method according to the present invention selects two values respectively corresponding to two rotating phases orthogonal to each other from a sine wave table that outputs a value for each phase of a sine wave, and selects the two selected A frequency conversion method for a frequency conversion device, wherein the frequency of an input signal is converted using a value.

  In addition, the frequency conversion method according to the present invention includes a sine wave table that outputs values for each phase of a sine wave, two values corresponding to two rotating normal and quadrature phases orthogonal to each other, And a frequency corresponding to the first input signal is converted using the selected two values, and a second value is used using the value corresponding to the quadrature phase and the value corresponding to the opposite phase. A frequency conversion method for a frequency conversion device, wherein the frequency of an input signal is converted.

  According to the present invention, since a plurality of tables such as a sin table and a cos table used for frequency conversion can be integrated into one, power consumption and cost can be reduced by reducing the circuit scale, and sampling can be performed. Maintenance can be facilitated when adjusting the table value by changing the frequency.

It is a block diagram which shows the structure of a transmitter. It is a circuit diagram which shows the circuit structure of a frequency shift process part. It is a block diagram of the frequency shift process part relevant to the frequency shift process part of this embodiment. It is a block which shows the structure of the frequency converter of 1st Embodiment which concerns on this invention. It is a block which shows the structure of the frequency converter of the 2nd Embodiment of this invention. It is a block diagram which shows one Example of the frequency converter of 1st Embodiment shown in FIG. It is a figure which shows the pointer initial value of a cos (theta) wave and -sin (theta) wave on the basis of the sin (theta) wave in the case of N sampling. It is a block diagram which shows the case where the sampling number N is set to 48 in the frequency converter of the Example shown in FIG. It is a figure which shows the pointer initial value of a cos (theta) wave and -sin (theta) wave on the basis of the sin (theta) wave in the case of 48 samplings. It is a block diagram which shows one Example of the frequency converter of 2nd Embodiment shown in FIG. It is a block diagram which shows the case where the sampling number N is set to 48 in the frequency converter of the Example shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of the transmission apparatus. FIG. 2 is a circuit diagram showing a circuit configuration of the frequency shift processing unit. The signal generation circuit 3 and the frequency shift processing unit 4 shown in FIG. 1 constitute a first embodiment of the frequency conversion device according to the present invention.

  As shown in FIG. 1, an in-phase component I and a quadrature component Q obtained by decomposing the main signal component of the first transmission channel 1 are input to the minus shift circuit 5 of the frequency shift processing unit 4, and the second transmission channel 2 The in-phase component I and quadrature component Q obtained by decomposing the main signal component are input to the plus shift circuit 6 having the same circuit configuration as the minus shift circuit 5 of the frequency shift processing unit 4. Then, a phase shift signal is generated by the signal generation circuit 3, and sine waves, −sin waves, and cosine waves are output as phase waves, and −sin waves and cosine waves are input to the minus shift circuit 5, and sine waves and cosine waves are output. Is input to the plus shift circuit 6. The main signal component of the first transmission channel is negatively shifted in the low frequency direction by the minus shift circuit 5, and the main signal component of the second transmission channel is negatively shifted in the high frequency direction by the plus shift circuit 6. Thus, the in-phase component I and the quadrature component Q of the main signal component of the first transmission channel shifted by minus shift are the in-phase component I, the quadrature component Q and the signal of the main signal component of the second transmission channel shifted by plus shift, respectively. The combined main component in-phase component I (1 + 2) and quadrature component Q (1 + 2) are output. The minus shift circuit 5 and the plus shift circuit 6 serve as first frequency conversion means and second frequency conversion means (or second frequency conversion means and first frequency conversion means).

  The technique for shifting the carrier frequency will be further described below. In order to shift the carrier frequency, each of the minus shift circuit 5 and the plus shift circuit 6 may multiply the main signal component and the phase shift component generated from the signal generation circuit 3.

  Expressions for realizing the frequency shift are shown in Expression 1, Expression 2, Expression 3, Expression 4, Expression 5, Expression 6, Expression 7, Expression 8, Expression 9, Expression 10, and Expression 11. In addition, the following formula 1-formula 11 show Formula 1-Formula 11.

When the main signal component A is decomposed into the in-phase component I and the quadrature component Q, it is expressed by Equation 1.

  Here, Ar is a real component of the main signal, Ai is an imaginary component of the main signal, and j is an imaginary unit. The in-phase component at time t is represented by I (t), and the quadrature component is represented by Q (t).

The phase shift component B is expressed by Equation 2 and Equation 3.

  Here, Br is a real component of the phase shift, Bi is an imaginary component of the phase shift, and j is an imaginary unit. Further, cos θ and sin θ indicate phase components.

  Expression 2 is a shift in the high frequency direction (plus shift), and Expression 3 is a shift in the low frequency direction (minus shift). In Expression 2 and Expression 3, the sign of the imaginary component is different.

Expression P obtained by multiplying the main signal by the phase shift is expressed by Expression 4 and Expression 5.

  Here, Ar * Br−Ai * Bi in Expression 4 is the main signal real number component after the plus shift, Ar * Bi + Ai * Br in Expression 4 is the main signal imaginary number component after the plus shift, and Ar * Br + Ai * in Expression 5. Bi is the main signal real number component after the minus shift, and Ar * Bi-Ai * Br in Equation 5 is the main signal imaginary number component after the minus shift.

Expression P ′ representing Expression P as an in-phase component, a quadrature component, and a phase shift component is expressed by Expression 6 and Expression 7.

  Equation 6 is a plus shift and Equation 7 is a minus shift.

Here, if the main signal in-phase component after the frequency shift is Iout (t) and the main signal quadrature component after the frequency shift is Qout (t), the equation P ′ can be expressed by the equations 8, 9, 10, and 11 It is expressed as follows.

  Here, Expression 8 is the main signal in-phase component after plus shift, Expression 9 is the main signal quadrature component after plus shift, Expression 10 is the main signal in-phase component after minus shift, and Expression 11 is after minus shift. The main signal orthogonal component is shown.

  The processing of the plus shift circuit 6 of the frequency shift processing unit 4 shown in FIG. 1 corresponds to Expression 8 and Expression 9, and the processing of the minus shift circuit 5 corresponds to Expression 10 and Expression 11.

  Here, prior to the description of the signal generation circuit 3 of FIG. 1 of the present embodiment, the configuration of the signal generation circuit 8 related to the signal generation circuit 3 of FIG. 1 of the present embodiment will be described with reference to FIG.

  FIG. 3 is a block diagram of a frequency shift processing unit related to the frequency shift processing unit of the present embodiment. FIG. 3 shows the minus shift circuit 5, plus shift circuit 6, and signal generation circuit 8 of the frequency shift processing unit 4 of FIG. 3 assumes a case where the carrier frequency of the main signal is shifted by 5 MHz, and realizes a 5 MHz phase wave at a sampling frequency of 240 MHz.

  Since the phase waves require sin θ, cos θ, and −sin θ for the arithmetic processing of Expression 8, Expression 9, Expression 10, and Expression 11, the signal generation circuit 8 in FIG. 21, a cos θ table 22, and a −sin θ table 23.

  The read pointer value generated by the quaternary counter 20 and the sin θ, cos θ, and −sin θ output from the tables 21 to 23 by the sin θ data selector 25, the cos θ data selector 26, and the −sin θ data selector 27 are referred to. , Sin θ, cos θ, and −sin θ corresponding to the read pointer value are output to the plus shift circuit 6 and the minus shift circuit 5, and the first transmission channel 1 and the second input to the plus shift circuit 6 and the minus shift circuit 5 are output. The carrier frequency with the transmission channel is shifted to the high frequency side and the low frequency side, respectively.

  The signal generation circuit 8 shown in FIG. 3 has the same problem as that of Patent Document 1 of the background art. That is, when the wave tables of the sin θ table, the cos θ table, and the −sin θ table are mounted on the circuit as they are, the memory capacity to be used is required for the number of types of the required tables. Further, if the sampling frequency is increased in order to reproduce a high-quality waveform, the required memory capacity increases.

  Hereinafter, a signal generation circuit in the frequency conversion device of the present embodiment will be described.

(First embodiment)
FIG. 4 is a block diagram showing the configuration of the frequency conversion apparatus of this embodiment. The minus shift circuit 5 and the plus shift circuit 6 in FIG. 4 constitute the frequency shift processing unit 4 in FIG. The signal generation circuit 9 corresponds to the signal generation circuit 3 in FIG. 1 and shows a specific configuration of the signal generation circuit 3. The signal generation circuit 9 includes a counter 30, a table unit 31, a pointer control unit 32, and a table data selector 33.

  The table data selector 33 includes three data selectors for sin θ, cos θ, and −sin θ, and the three data selectors are connected to the table unit 31. The data selectors for sin θ and cos θ are the first selector and the second selector (or the second selector and the first selector), and the data selector for −sin θ is the third selector.

  The table unit 31 has a sin θ table that holds sin θ according to the required number of samplings. The sin θ value held in the sin θ table is a value corresponding to the phase. The table unit 31 maintains a state in which those held sin θ values are output simultaneously. For example, if the number of samplings for one period (360 degrees) of sin θ (θ is zero to 360 degrees) is N, N sin θs corresponding to the sampling number N (N phases) are held in the sin θ table. The In this case, the table unit 31 maintains a state in which the held N sin θ values are output simultaneously. The sin θ table is a sine wave table. Since cos θ = sin (θ + 90 degrees) and −sin θ = sin (θ + 180 degrees), by referring to the phases θ, θ + 90 degrees, θ + 180 degrees, sin θ, cos θ, and −sin θ are output from the sin θ table from the sine wave table. Can do. The sine wave table becomes a sin θ table as shown in FIG. 3 if the counter value is 0 when the phase is zero degrees, but the counter value is 0 when the phase is 90 degrees. Then, the cos θ table as shown in FIG. 3 is obtained, and when the counter value is set to 0 when the phase is 180 degrees, the −sin θ table as shown in FIG. 3 is obtained. That is, in the present application, the sine wave table is not limited to the sin θ table of FIG. 3, and includes any one in which the count value 0 is matched to a desired phase, as in the case of a cos θ table or a −sin θ table.

  The counter 30 is a circulation counter, which sequentially outputs count values from 0 to the maximum value, returns to 0 at the next count after taking the maximum value, and circulates and outputs the count value from 0 to the maximum value. The maximum value is the sampling number minus 1, and the counter 30 counts the same number as the sampling number N and outputs the counter value. The counter 30 counts at a speed corresponding to the shift frequency in the frequency shift performed by the plus shift circuit 6 and the minus shift circuit 5. That is, when the shift frequency is Δf, the count is performed so as to make a round with a period T (= 1 / Δf). When the number of counts in one period is N, the clock frequency f of the counter 30 is N × Δf.

  The pointer control unit 32 adds a value calculated from the number of samplings for one cycle of sin θ to the counter value output from the counter 30 in order to set the value of the read pointer corresponding to cos θ and −sin θ. The pointer control unit 32 serves as phase generation means. The value added to the counter value output from the counter 30 is a quarter value of the sampling number in the case of cos θ, and a half value of the sampling number in the case of −sin θ. The value of the read pointer corresponding to sin θ is the counter value output from the counter 30. Read pointer values (count value, count value + (1/4 of sampling number), count value + (1/2 of sampling number)) corresponding to sin θ, cos θ, and −sin θ are received from the pointer control unit 32. The data is output to the three data selectors for sin θ, cos θ, and −sin θ of the table data selector 33.

  The count value from 0 to (sampling number −1) output from the counter 30 is output in a circulating manner, and the count value corresponds to 360 degrees, so that the reference rotates between zero degrees and 360 degrees. Corresponds to the phase. The count value + (one quarter of the sampling number) corresponds to the reference phase +90 degrees, and the count number + (one half of the sampling number) corresponds to the reference phase +180 degrees. The reference phase, (reference phase + 90 degrees), (reference phase + 90 degrees), and (reference phase + 180 degrees) are two rotating phases that are orthogonal to each other. Note that the reference phase, (reference phase + 90 degrees), and (reference phase + 180 degrees) are the positive phase, the quadrature phase, and the reverse phase, respectively.

  The table data selector 33 extracts the values of sin θ, cos θ, and −sin θ output from the sin θ table of the table unit 31 based on the read pointer values corresponding to sin θ, cos θ, and −sin θ. The table data selector 33 selects a combination of sin θ, cos θ, and −sin θ (sin θ and cos θ, −sin θ and cos θ) corresponding to the read pointer value set by the pointer control unit 32 to the plus shift circuit 6 and the minus shift circuit 5. Output. Then, the plus shift circuit 6 and the minus shift circuit 5 respectively input the carrier frequencies of the first transmission channel 1 and the second transmission channel inputted to these into sin θ (= sin () inputted from the table data selector 33. 2πΔft)) and cos θ (= cos (2πΔft)), −sin θ (= sin (2πΔft)) and cos θ (= cos (2πΔft)) are used to shift (frequency conversion) between the high frequency side and the low frequency side. .

  The table unit 31 maintains a state in which the held sin θ values are simultaneously output, and the table data selector 33 determines the table unit 31 based on the read pointer values corresponding to sin θ, cos θ, and −sin θ. Although it has been described that the values of sin θ, cos θ, and −sin θ output from the sin θ table of FIG. 5 are extracted, the table unit 31 does not necessarily output all the sin θ values at the same time, and the table data selector 33 simultaneously outputs the table unit. The values of sin θ, cos θ, and −sin θ may be read from 31. For example, sin θ, cos θ, and −sin θ may be read from the table unit 31 in which the table data selector 33 internally outputs only one at a time in a time division manner, and these may be maintained and then output simultaneously.

  The effect of this embodiment is that it is possible to save power and cost by reducing the circuit scale. This is because the memory capacity can be reduced to 1/3 by using one table for sin θ, cos θ, and −sin θ.

  The effect of this embodiment is that maintenance can be facilitated. This is because only one table needs to be changed when the table value is adjusted by changing the sampling frequency.

(Second Embodiment)
FIG. 5 is a block diagram showing the configuration of the frequency conversion apparatus according to the second embodiment of the present invention. The signal generation circuit 11 in FIG. 5 adds a shift selector 34 as a fourth selector to the signal generation circuit 9 in FIG. 4, and switches between sin θ and −sin θ according to the shift select signal, and serves as a frequency conversion means. Selectively output to 10. The configuration of the shift circuit 10 is the same as that of the minus shift circuit 5 or the plus shift circuit 6. The shift selector 34 selects sin θ when performing a positive shift, and selects −sin θ when performing a negative shift.

  In the frequency converter shown in FIG. 4, as shown in FIG. 1, the plus shift circuit 6 plus shifts the in-phase component I and the quadrature component Q of the main signal component of the first transmission channel, and the minus shift circuit 5 The in-phase component I and the quadrature component Q of the main signal components of the two transmission channels are negatively shifted and then synthesized by the signal synthesizer 7, and the synthesized principal component in-phase component I (1 + 2) and quadrature component Q (1 + 2) ) Was output. In this embodiment, by adding a shift selector 34 to the signal generation circuit 9, the minus shift circuit 5 and the plus shift circuit 6 are combined into one shift circuit 10 and the main signal component in-phase component I and the quadrature component Q plus shift. It is possible to make a negative shift.

  In the present embodiment, in addition to the effect that the number of tables in the first embodiment can be reduced to 効果, the number of frequency shift circuits can be reduced to ½, and the circuit scale can be further reduced. There is. In addition, since the number of frequency shift circuits can be reduced to ½, occurrence of problems at the time of circuit change can be suppressed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 6 is a block diagram showing an example of the frequency conversion device according to the first embodiment shown in FIG. This example shows a case where the number of samplings for one cycle of sin θ is N (N is a positive natural number) in the frequency conversion device of the first embodiment shown in FIG.

  6 includes an N-ary counter 40, a sin θ table 41, a −sin θ read pointer setting unit 42, a cos θ read pointer setting unit 43, and a table data selector 44. The table data selector 44 includes three data selectors for sin θ, cos θ, and −sin θ, and the three data selectors are connected to the sin θ table 41.

  The sin θ table 41 holds the value of sin θ according to the N sampling numbers. The N-ary counter 40 counts the same number as the N sampling numbers and outputs a counter value. When the sampling number is N, the maximum value of the N-ary counter 40 is N-1.

  When the counter value output from the N-ary counter 40 is M (0 ≦ M ≦ N−1), the counter value M is input to the data selector for sin θ, and the value of the read pointer for referring to sin θ is M. It becomes. The counter value M is input to the read pointer setting unit 42 for −sin θ and the read pointer setting unit 43 for cos θ, and N / 2 and N / 4 are added to the counter value M, respectively. The values (M + N / 2) and (M + N / 4) output from the read pointer setting unit 42 for −sin θ and the read pointer setting unit 43 for cos θ are input to the data selector for −sin θ and the data selector for cos, respectively. Is done. The value of the read pointer for referring to −sin θ is M + N / 2, and the value of the read pointer for referring to cos θ is M + N / 4. The sin θ and cos θ of the sin θ table 41 corresponding to the read pointer values M and M + N / 4 are input to the plus shift circuit 6 and the cos θ of the sin θ table 41 corresponding to the read pointer values M + N / 4 and M + N / 2. , −sin θ is input to the minus shift circuit 5.

  Referring to FIG. 7, the initial value of the read pointer for referring to sin θ is 0, and the sin pointer initial value setting 50 is set. The initial value of the read pointer for referring to cos θ is a quarter of the sampling number N, and the read pointer initial value setting 51 for cos θ is set. The initial value of the read pointer for realizing −sin θ is ½ of the sampling number N, and the read pointer initial value setting 52 for −sin θ. As described above, these initial values N / 4 and N / 2 are added to the counter value output from the N-ary counter 40.

  In this embodiment, the case where the sampling number N is 48 will be described with reference to FIGS.

  In the signal generation circuit 13 of FIG. 8, the N-ary counter 40 in the signal generation circuit 12 of FIG. 6 is the 48-ary counter 60, the sin θ table 41 is the sin table 61, and the −sin θ read pointer setting unit 42 is the −sin θ read. In the pointer setting unit 62, the cos θ read pointer setting unit 43 is replaced with a cos θ read pointer setting unit 63, and the table data selector 44 is replaced with a table data selector 64. Except for the sampling number N being 48, the configuration and operation of the signal generation circuit 13 are the same as those of the signal generation circuit 12 of FIG.

Referring to FIG. 9, cos θ is obtained by a 90 ° shift of sin θ, and −sin θ is obtained by a 180 ° shift of sin θ. Therefore, the read pointer initial value of cos θ is changed from the sin read pointer initial value 70 of the counter value 0 corresponding to sin 0 to the cos θ read pointer initial value 71 of +12 (12 = sampling number / 4), and the value 12 is added. Is performed by the read pointer setting unit 63 for cos θ. The read pointer initial value of −sin θ is changed from a sin read pointer initial value 70 of the counter value 0 corresponding to sin 0 to a −sin θ read pointer initial value 72 of +24 (24 = sampling number / 2). Is added by the read pointer setting unit 62 for −sin θ.
(Second embodiment)
FIG. 10 is a block diagram showing an example of the frequency conversion device according to the second embodiment shown in FIG. This example shows a case where the number of samplings for one cycle of sin θ is N (N is a positive natural number) in the frequency conversion device of the second embodiment shown in FIG. The configuration of the frequency conversion device shown in FIG. 10 is obtained by adding a shift selector 45 to the signal generation circuit 12 of the frequency conversion device of the first embodiment shown in FIG. As shown in FIG. 6, except that sin θ and −sin θ are switched by the shift select signal to be output and output to the shift circuit 10 provided in place of 6 in the minus shift circuit 5 and the plus shift circuit. The frequency converter is the same as that of the first embodiment.

  In this embodiment, the configuration when the sampling number N is 48 is shown in FIG. The frequency converter shown in FIG. 11 has the signal generator circuit 15 by adding a shift selector 65 to the signal generator circuit 13 of the frequency converter shown in FIG. , Sin θ and −sin θ are switched and output to a shift circuit 10 provided in place of the minus shift circuit 5 and the plus shift circuit 6, and is the same as the frequency conversion apparatus shown in FIG. .

  While the embodiments and examples of the present invention have been described above, each frequency conversion device can be realized by hardware, software, or a combination thereof. Further, the frequency conversion method performed by the above-described frequency conversion device can also be realized by hardware, software, or a combination thereof. Here, “realized by software” means realized by a computer reading and executing a program.

  The program may be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-ROMs. R, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The computer may be supplied to a computer by a transitory computer readable medium Examples of temporary computer readable media include electrical signals, optical signals, and electromagnetic waves. And a program to a computer via a wired communication path such as an optical fiber or a wireless communication path. It can supply.

  A part or all of each of the above embodiments and examples can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
From the sine wave table that outputs a value for each phase of the sine wave, two values corresponding to two rotating phases orthogonal to each other are selected, and the frequency of the input signal is selected using the selected two values. The frequency converter characterized by converting.

(Appendix 2)
From the sine wave table that outputs a value for each phase of the sine wave, select two values that correspond to the two rotating normal and quadrature phases that are orthogonal to each other, and a value that corresponds to the opposite phase, and select The frequency of the first input signal is converted using the two values, and the frequency of the second input signal is converted using the value corresponding to the quadrature phase and the value corresponding to the opposite phase. A frequency converter.

(Appendix 3)
The frequency converter according to appendix 1, wherein
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
A circulation counter that outputs a rotating reference phase;
Phase generating means for generating a first phase and a second phase as two rotating phases orthogonal to each other based on the reference phase;
A first selector that selects and outputs a value corresponding to the first phase out of the plurality of values output from the sine wave table based on the first phase;
A second selector that selects and outputs a value corresponding to the second phase out of the plurality of values output from the sine wave table based on the second phase;
Frequency conversion means for converting the frequency of the input signal using the value output from the first selector and the value output from the second selector;
A frequency conversion device comprising:

(Appendix 4)
The frequency converter according to appendix 2,
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
A circulation counter that outputs a rotating reference phase;
Phase generation means for generating a first phase, a second phase, and a third phase based on the reference phase so as to have a phase relationship with the normal phase, the quadrature phase, and the reverse phase;
A first selector that selects and outputs a value corresponding to the first phase out of the plurality of values output from the sine wave table based on the first phase;
A second selector that selects and outputs a value corresponding to the second phase out of the plurality of values output from the sine wave table based on the second phase;
A third selector that selects and outputs a value corresponding to the third phase out of the plurality of values output from the sine wave table based on the third phase;
Corresponding to the positive phase and the value corresponding to the quadrature phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector First frequency conversion means for converting the frequency of the first input signal using a value to be
Corresponds to the value corresponding to the quadrature phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector, and the opposite phase. Second frequency conversion means for converting the frequency of the second input signal using a value to be
A frequency conversion device comprising:

(Appendix 5)
The frequency conversion device according to attachment 3, wherein
The phase generation unit is configured to set the first phase, the second phase, and the third phase based on the reference phase so that the first phase, the second phase, and the third phase have a phase relationship of a normal phase, a quadrature phase, and a reverse phase. Generating the second phase and the third phase;
The own frequency converter is
A third selector that selects and outputs a value corresponding to the third phase out of the plurality of values simultaneously output from the sine wave table based on the third phase;
Corresponding to a value corresponding to the positive phase and a negative phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector A fourth selector for selecting and outputting one of the values to be output;
Further comprising
The frequency conversion unit corresponds to a quadrature phase in the phase relationship among a value output from the first selector, a value output from the second selector, and a value output from the third selector. A frequency converter that converts a frequency of the input signal using a value and a value output from the fourth selector.

(Appendix 6)
The frequency converter according to appendix 5,
The frequency converter according to claim 4, wherein the fourth selector switches a value to be selected and output in accordance with whether the frequency of the input signal is increased or decreased in the frequency conversion in the frequency conversion means.

(Appendix 7)
The frequency converter according to appendix 4, wherein
The first frequency conversion means shifts the frequency of the first input signal to one of a high frequency side and a low frequency side, and the second frequency conversion means sets the frequency of the second input signal to a high frequency side and a low frequency side. Shifting to the other of the above, a frequency converter.

(Appendix 8)
From the sine wave table that outputs a value for each phase of the sine wave, two values corresponding to two rotating phases orthogonal to each other are selected, and the frequency of the input signal is selected using the selected two values. A frequency conversion method for a frequency conversion device, characterized in that

(Appendix 9)
From the sine wave table that outputs a value for each phase of the sine wave, select two values that correspond to the two rotating normal and quadrature phases that are orthogonal to each other, and a value that corresponds to the opposite phase, and select The frequency of the first input signal is converted using the two values, and the frequency of the second input signal is converted using the value corresponding to the quadrature phase and the value corresponding to the opposite phase. A frequency conversion method of the frequency conversion device.

(Appendix 10)
The frequency conversion method according to attachment 8, wherein
Outputting a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees from the sine wave table;
Outputting a rotating reference phase from the circulation counter;
Generating a first phase and a second phase as two rotating phases orthogonal to each other based on the reference phase;
Selecting and outputting a value corresponding to the first phase among the plurality of values output from the sine wave table based on the first phase; and
Selecting and outputting a value corresponding to the second phase among the plurality of values output from the sine wave table based on the second phase; and
Converting the frequency of the input signal using a value corresponding to the first phase and a value corresponding to the second phase;
A frequency conversion method comprising:

(Appendix 11)
The frequency conversion method according to appendix 9, wherein
Outputting a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees from the sine wave table;
Outputting a rotating reference phase from the circulation counter;
Generating a first phase, a second phase, and a third phase based on the reference phase so as to have a phase relationship with the normal phase, the quadrature phase, and the reverse phase;
Selecting and outputting a value corresponding to the first phase among the plurality of values output from the sine wave table based on the first phase; and
Selecting and outputting a value corresponding to the second phase among the plurality of values output from the sine wave table based on the second phase; and
Selecting and outputting a value corresponding to the third phase among the plurality of values output from the sine wave table based on the third phase;
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the orthogonal phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the positive phase, Converting the frequency of the first input signal;
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the quadrature phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the opposite phase, Converting the frequency of the second input signal;
A frequency conversion method comprising:

(Appendix 12)
The frequency conversion method according to appendix 10, wherein
In the step of generating the first phase and the second phase, based on the reference phase, the first phase, the second phase, and the third phase have a phase relationship of a normal phase, a quadrature phase, and a reverse phase. And generating the first phase, the second phase, and the third phase,
Selecting and outputting a value corresponding to the third phase among the plurality of values simultaneously output from the sine wave table based on the third phase;
Any of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the positive phase and the value corresponding to the negative phase in the phase relationship among the values corresponding to the third phase. A step of selecting and outputting the value,
Further comprising
In the step of converting the frequency of the input signal, a value corresponding to an orthogonal phase in the phase relationship among a value corresponding to the first phase, a value corresponding to the second phase, and a value corresponding to the third phase. And converting the frequency of the input signal using the value output in the step of selecting and outputting one of the value corresponding to the positive phase and the value corresponding to the negative phase A characteristic frequency conversion method.

(Appendix 13)
The frequency conversion method according to attachment 12, wherein
The step of selecting and outputting one of the value corresponding to the positive phase and the value corresponding to the negative phase depends on whether the frequency of the input signal is increased or decreased in the conversion of the frequency of the input signal. A frequency conversion method characterized by switching values to be selected and output.

(Appendix 14)
The frequency conversion method according to appendix 11, wherein
In the step of converting the frequency of the first input signal, in the step of shifting the frequency of the first input signal to one of the high frequency side and the low frequency side and converting the frequency of the second input signal, the second A frequency conversion method characterized by shifting the frequency of an input signal to the other of a high frequency side and a low frequency side.

(Appendix 15)
The computer selects two values respectively corresponding to two rotating phases that are orthogonal to each other from a sine wave table that outputs a value for each phase of the sine wave, and inputs the two values using the selected two values. A frequency conversion program for executing a procedure for converting the frequency of a signal.

(Appendix 16)
From the sine wave table that outputs a value for each phase of the sine wave to the computer, select two values that correspond to two rotating normal and quadrature phases that are orthogonal to each other, and a value that corresponds to the opposite phase Then, the frequency of the first input signal is converted using the selected two values, and the frequency of the second input signal is converted using the value corresponding to the quadrature phase and the value corresponding to the opposite phase. Frequency conversion program to execute the procedure.

(Appendix 17)
The frequency conversion program according to appendix 15,
Outputting a plurality of values of a sine wave respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees from the sine wave table to the computer;
A procedure for outputting a rotating reference phase from the circulation counter;
Generating a first phase and a second phase as two rotating phases orthogonal to each other based on the reference phase;
A procedure for selecting and outputting a value corresponding to the first phase among the plurality of values output from the sine wave table based on the first phase;
A procedure for selecting and outputting a value corresponding to the second phase among the plurality of values output from the sine wave table based on the second phase;
Converting the frequency of the input signal using a value corresponding to the first phase and a value corresponding to the second phase;
A program for frequency conversion to execute.

(Appendix 18)
The frequency conversion program according to appendix 16, wherein
Outputting a plurality of values of a sine wave respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees from the sine wave table to the computer;
A procedure for outputting a rotating reference phase from the circulation counter;
Generating a first phase, a second phase, and a third phase based on the reference phase so as to have a phase relationship with the positive phase, the quadrature phase, and the reverse phase;
A procedure for selecting and outputting a value corresponding to the first phase among the plurality of values output from the sine wave table based on the first phase;
A procedure for selecting and outputting a value corresponding to the second phase among the plurality of values output from the sine wave table based on the second phase;
A procedure for selecting and outputting a value corresponding to the third phase out of the plurality of values output from the sine wave table based on the third phase;
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the orthogonal phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the positive phase, Converting the frequency of the first input signal;
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the quadrature phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the opposite phase, Converting the frequency of the second input signal;
A program for frequency conversion to execute.

(Appendix 19)
A frequency conversion program according to appendix 17,
In the procedure of generating the first phase and the second phase, based on the reference phase, the first phase, the second phase, and the third phase have a phase relationship of a normal phase, a quadrature phase, and a reverse phase. And generating the first phase, the second phase, and the third phase,
A procedure for selecting and outputting a value corresponding to the third phase among the plurality of values simultaneously output from the sine wave table to the computer based on the third phase;
Any of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the positive phase and the value corresponding to the negative phase in the phase relationship among the values corresponding to the third phase. The procedure to select and output that value,
Is executed further,
In the procedure of converting the frequency of the input signal, a value corresponding to an orthogonal phase in the phase relationship among a value corresponding to the first phase, a value corresponding to the second phase, and a value corresponding to the third phase. And converting the frequency of the input signal using the value output in the procedure of selecting and outputting one of the value corresponding to the positive phase and the value corresponding to the negative phase A featured frequency conversion program.

(Appendix 20)
A frequency conversion program according to attachment 19, wherein
The procedure for selecting and outputting one of the value corresponding to the positive phase and the value corresponding to the negative phase depends on whether the frequency of the input signal is increased or decreased in the conversion of the frequency of the input signal. A frequency conversion program characterized in that the value to be selected and output is switched.

(Appendix 21)
A frequency conversion program according to appendix 18, wherein
In the procedure of converting the frequency of the first input signal, the frequency of the first input signal is shifted to one of the high frequency side and the low frequency side and the frequency of the second input signal is converted. A frequency conversion program for shifting the frequency of an input signal to the other of a high frequency side and a low frequency side.

The present invention can be used in a carrier frequency shift circuit for digital signal communication. In particular, the present invention can be applied to a communication processing device that further reduces costs.

1 transmission channel 2 transmission channel 3 signal generation circuit 4 frequency shift processing unit 5 minus shift circuit 6 plus shift circuit 7 signal synthesis unit 20 counter 21 sin θ table 22 cos θ table 23 -sin θ table 25 sin θ data selector 26 cos θ data selector 27 -sin θ Data selector 30 Counter 31 Table unit 32 Pointer control unit 33 Table data selector 34 Shift selector 40 N-ary counter 41 sin θ table 42 -sin θ pointer setting unit 43 cos θ pointer setting unit 44 table data selector 45 shift selector 60 quaternary counter 61 sin θ table 62 −sin θ pointer setting unit 63 cos θ pointer setting unit 64 table data selector 65 shift selector

Claims (7)

From the sine wave table that outputs a value for each phase of the sine wave, two values corresponding to two rotating phases orthogonal to each other are selected, and the frequency of the input signal is selected using the selected two values. to convert the,
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
A circulation counter that outputs a rotating reference phase;
Phase generating means for generating a first phase and a second phase as two rotating phases orthogonal to each other based on the reference phase;
A first selector that selects and outputs a value corresponding to the first phase out of the plurality of values output from the sine wave table based on the first phase;
A second selector that selects and outputs a value corresponding to the second phase out of the plurality of values output from the sine wave table based on the second phase;
Frequency conversion means for converting the frequency of the input signal using the value output from the first selector and the value output from the second selector;
A frequency conversion device comprising: From the sine wave table that outputs a value for each phase of the sine wave, select two values that correspond to the two rotating normal and quadrature phases that are orthogonal to each other, and a value that corresponds to the opposite phase, and select The frequency of the first input signal is converted using the two values, and the frequency of the second input signal is converted using the value corresponding to the quadrature phase and the value corresponding to the opposite phase ,
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
A circulation counter that outputs a rotating reference phase;
Phase generation means for generating a first phase, a second phase, and a third phase based on the reference phase so as to have a phase relationship with the normal phase, the quadrature phase, and the reverse phase;
A first selector that selects and outputs a value corresponding to the first phase out of the plurality of values output from the sine wave table based on the first phase;
A second selector that selects and outputs a value corresponding to the second phase out of the plurality of values output from the sine wave table based on the second phase;
A third selector that selects and outputs a value corresponding to the third phase out of the plurality of values output from the sine wave table based on the third phase;
Corresponding to the positive phase and the value corresponding to the quadrature phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector First frequency conversion means for converting the frequency of the first input signal using a value to be
Corresponds to the value corresponding to the quadrature phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector, and the opposite phase. Second frequency conversion means for converting the frequency of the second input signal using a value to be
A frequency conversion device comprising: The frequency converter according to claim 1 ,
The phase generation unit is configured to set the first phase, the second phase, and the third phase based on the reference phase so that the first phase, the second phase, and the third phase have a phase relationship of a normal phase, a quadrature phase, and a reverse phase. Generating the second phase and the third phase;
The own frequency converter is
A third selector that selects and outputs a value corresponding to the third phase out of the plurality of values simultaneously output from the sine wave table based on the third phase;
Corresponding to a value corresponding to the positive phase and a negative phase in the phase relationship among the value output from the first selector, the value output from the second selector, and the value output from the third selector A fourth selector for selecting and outputting one of the values to be output;
Further comprising
The frequency conversion unit corresponds to a quadrature phase in the phase relationship among a value output from the first selector, a value output from the second selector, and a value output from the third selector. A frequency converter that converts a frequency of the input signal using a value and a value output from the fourth selector. The frequency converter according to claim 3 , wherein
The frequency converter according to claim 4, wherein the fourth selector switches a value to be selected and output in accordance with whether the frequency of the input signal is increased or decreased in the frequency conversion in the frequency conversion means. The frequency converter according to claim 2 ,
The first frequency conversion means shifts the frequency of the first input signal to one of a high frequency side and a low frequency side, and the second frequency conversion means sets the frequency of the second input signal to a high frequency side and a low frequency side. Shifting to the other of the above, a frequency converter. From the sine wave table that outputs a value for each phase of the sine wave, two values corresponding to two rotating phases orthogonal to each other are selected, and the frequency of the input signal is selected using the selected two values. to convert the,
In the conversion,
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
Output the rotating reference phase,
Generating a first phase and a second phase as two rotating phases orthogonal to each other based on the reference phase;
Based on the first phase, out of the plurality of values output from the sine wave table, select and output a value corresponding to the first phase,
Based on the second phase, out of the plurality of values output from the sine wave table, the value corresponding to the second phase is selected and output,
A frequency conversion method for a frequency conversion device , wherein the frequency of the input signal is converted using a value corresponding to the first phase and a value corresponding to the second phase . From the sine wave table that outputs a value for each phase of the sine wave, select two values that correspond to the two rotating normal and quadrature phases that are orthogonal to each other, and a value that corresponds to the opposite phase, and select The frequency of the first input signal is converted using the two values, and the frequency of the second input signal is converted using the value corresponding to the quadrature phase and the value corresponding to the opposite phase ,
In converting each input signal,
The sine wave table outputs a plurality of values of sine waves respectively corresponding to a plurality of phases uniformly distributed in a range of zero degrees or more and less than 360 degrees,
Output the rotating reference phase,
Based on the reference phase, a first phase, a second phase, and a third phase are generated so as to have a phase relationship with the normal phase, the quadrature phase, and the reverse phase,
Based on the first phase, out of the plurality of values output from the sine wave table, select and output a value corresponding to the first phase,
Based on the second phase, out of the plurality of values output from the sine wave table, the value corresponding to the second phase is selected and output,
Based on the third phase, out of the plurality of values output from the sine wave table, the value corresponding to the third phase is selected and output,
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the orthogonal phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the positive phase, Converting the frequency of the first input signal;
Of the value corresponding to the first phase, the value corresponding to the second phase, and the value corresponding to the quadrature phase in the phase relationship among the value corresponding to the third phase and the value corresponding to the opposite phase, A frequency conversion method for a frequency conversion device, wherein the frequency of the second input signal is converted .