JP7558016B2 - Signal recording/reproducing device, signal transmitting/receiving device, and signal recording/reproducing method - Google Patents

Description

This disclosure relates to a signal recording and playback device, a signal transmission and reception device, and a signal recording and playback method that record and play back RF (Radio Frequency) signals.

There are signal recording and playback devices that record and play back RF signals such as radar signals and communication signals. Signal recording and playback devices are used, for example, to generate simulated radio waves for testing, evaluating, and jamming radar and communication devices.

Patent document 1 discloses a digital RF memory device that can reproduce and transmit an RF signal that is transmitted using a frequency hopping method that switches between multiple frequencies at high speed as a signal containing multiple frequency components immediately after recording the signal as recording data.

JP 2018-163090 A

In the technology described in Patent Document 1, in order to reproduce a signal containing multiple frequency components, the RF signal of each frequency is down-converted and the A/D (Analog/Digital) converted recording data is recorded in memory, and then an addition operation is performed. This results in a decrease in the fidelity of the reproduced signal due to quantization errors and a decrease in immediacy due to processing time.

This disclosure has been made in consideration of the above-mentioned circumstances, and aims to improve the fidelity and immediacy when recording an RF signal transmitted using a frequency hopping method and playing it back as a signal containing multiple frequency components.

In order to achieve the above object, the signal recording and reproducing device according to the present disclosure includes a synthesis unit, a storage unit, and a control unit. The synthesis unit sequentially receives received signals extracted from RF signals of multiple frequencies transmitted by a frequency hopping method, and synthesizes the received signals with a synthesis signal each time the received signals are input to generate a synthesis signal. The storage unit stores and outputs recording data obtained by A/D converting the synthesis signal generated by the synthesis unit. The control unit switches between a first path that outputs an analog signal obtained by D/A (Digital/Analog) converting the recording data output by the storage unit as a synthesis signal, and a second path that outputs the analog signal as a transmission signal. The control unit switches to the first path while the synthesis signal is being generated, and switches to the second path while the synthesis signal is not being generated.

According to the present disclosure, a received signal is synthesized with a synthesis signal to generate a synthesis signal, which is then A/D converted and stored as recorded data, and the analog signal obtained by D/A converting the recorded data is output as a synthesis signal while the synthesis signal is being generated, and output as a transmission signal while the synthesis signal is not being generated, thereby making it possible to record an RF signal transmitted using a frequency hopping method and improve the fidelity and immediacy when playing back the signal as a signal containing multiple frequency components.

FIG. 1 is a diagram showing an example of the configuration of a signal transmitting/receiving device including a signal recording/reproducing device according to an embodiment; FIG. 1 shows an example of the configuration of a signal recording and reproducing device according to an embodiment. FIG. 2 is a diagram for explaining timing at which the signal recording and reproducing device according to the embodiment records and reproduces a signal; 1 is a flowchart showing a signal recording/reproducing process according to an embodiment of the present invention; FIG. 13 is a diagram showing a configuration example of a signal recording/reproducing device according to a modified example.

A signal recording and reproducing device, a signal transmitting and receiving device, and a signal recording and reproducing method according to the embodiments will be described in detail below with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals. In the following embodiments, the storage of recorded data by the memory unit of the signal recording and reproducing device is referred to as "recording," and the output of recorded data by the memory unit of the signal recording and reproducing device is referred to as "reproducing."

Figure 1 is a diagram showing the configuration of a signal transmission/reception device equipped with a signal recording/reproduction device according to an embodiment. The signal transmission/reception device 1 includes a receiving antenna 11 that receives an RF signal transmitted by a frequency hopping method, a receiving unit 12 that extracts a received signal from the RF signal received by the receiving antenna 11, and a signal recording/reproduction device 13 that combines the received signals and generates and stores recorded data that is A/D converted. The signal recording/reproduction device 13 generates a transmission signal from the stored recorded data. The signal transmission/reception device 1 includes a transmitting unit 14 that converts the transmission signal generated by the signal recording/reproduction device 13 into an RF signal, and a transmitting antenna 15 that transmits the RF signal converted by the transmitting unit 14.

The receiving antenna 11 sequentially receives RF signals transmitted from a transmitting station using a frequency hopping method. The transmitting station transmits RF signals by hopping frequencies at a predetermined hopping rate within the range of frequencies f1 to fn (n is an integer). Hereinafter, each frequency f1 to fn is referred to as a hopping frequency.

The receiving unit 12 down-converts the RF signal received by the receiving antenna 11 and converts it into an intermediate frequency (IF) signal. The receiving unit 12 extracts a receiving signal in the hopping frequency range from the converted IF signal. The receiving unit 12 sequentially sends the extracted receiving signals to the signal recording and reproducing device 13.

The signal recording and reproducing device 13 synthesizes the received signal received from the receiving unit 12 with a synthesis signal, then performs A/D conversion to generate recording data. The synthesis signal is an IF signal that is obtained by D/A converting the stored recording data. The signal recording and reproducing device 13 stores the generated recording data.

Specifically, for the first received signal, the signal recording and reproducing device 13 A/D converts the received signal and stores the recorded data because there is no synthesis signal. For received signals received the second time and thereafter, the signal recording and reproducing device 13 synthesizes the synthesis signal, which is a D/A conversion of the stored recorded data, with the received signal, A/D converts it, and stores the recorded data. In other words, the signal recording and reproducing device 13 sequentially synthesizes and A/D converts the received signal each time it receives a received signal of a different frequency, and stores the recorded data.

The signal recording and playback device 13 sends the IF signal, which is the D/A converted version of the stored recording data, to the transmission unit 14 as a transmission signal.

The transmitting unit 14 amplifies the transmission signal received from the signal recording/reproducing device 13, up-converts it, and converts it into an RF signal. The transmitting unit 14 sends the RF signal obtained by converting the transmission signal to the transmitting antenna 15. The transmitting antenna 15 transmits the RF signal received from the transmitting unit 14 to the transmitting station. By transmitting the RF signal toward the transmitting station from the transmitting antenna 15, radio wave interference can be generated with the RF signal transmitted from the transmitting station using a frequency hopping method. Using this, the signal transmitting/receiving device 1 can be used, for example, as a radio wave generating application device that transmits simulated radio waves in response to radar radio waves from a radar device to test, evaluate, jam, etc. the radar device.

The signal recording and reproducing device 13 will now be described with reference to FIG. 2. As shown in FIG. 2, the signal recording and reproducing device 13 includes a synthesis unit 131 that synthesizes the received signal received from the receiving unit 12 with a synthesis signal to generate a synthetic signal, an A/D converter 132 that performs A/D conversion of the synthetic signal, a control unit 133 that controls recording and reproduction of the recorded data obtained by A/D converting the synthetic signal, a memory unit 134 that stores and outputs the recorded data, and a D/A converter 135 and a D/A converter 136 that D/A convert the recorded data output from the memory unit 134. In the figure, the flow of analog signals is indicated by solid arrows, and the flow of digital signals or control signals is indicated by dashed arrows.

The synthesis unit 131 includes a synthesizer 1311 that synthesizes the received signal and a synthesis signal to output a synthesis signal, a detector 1312 that detects the synthesis signal, and a detector 1313 that detects the received signal.

The received signal received by the synthesis unit 131 from the receiving unit 12 is distributed and input to the synthesizer 1311 and the detector 1313. The detector 1313 detects the received signal and sends the digitized received video signal to the control unit 133. The synthesizer 1311 combines the received signal with a signal to be synthesized and outputs a synthesized signal. The synthesized signal output from the synthesizer 1311 is distributed and input to the A/D converter 132 and the detector 1312. The A/D converter 132 sends recording data obtained by A/D converting the synthesized signal to the memory unit 134. The detector 1312 detects the synthesized signal and sends the digitized synthesized video signal to the control unit 133. In this way, the signal recording and reproducing device 13 generates recording data by combining the received signal and the combining signal and then performing A/D conversion, which reduces the degradation of the fidelity of the reproduced signal (transmitted signal) due to quantization error compared to converting each received signal into recording data, storing it, and performing the adding process of the recording data each time.

The control unit 133 includes a recording and playback control unit 1331 that controls the recording and playback of the recording data, and a path switching unit 1332 that switches the output destination of the recording data output by the storage unit 134. The control unit 133 is configured, for example, by an FPGA (Field Programmable Gate Array).

When the recording and playback control unit 1331 receives a received video signal from the detector 1313, it sends a playback start trigger to the memory unit 134. When the memory unit 134 receives the playback start trigger from the recording and playback control unit 1331, it outputs the recorded data. The playback start trigger is an example of a trigger that outputs the recorded data. At this time, the recorded data is output to the D/A converter 136, and a synthesis signal is output from the D/A converter 136 to the synthesizer 1311. The path along which the synthesis signal is output from the D/A converter 136 to the synthesizer 1311 is an example of the first path.

After time t1 has elapsed since sending the playback start trigger, the recording and playback control unit 1331 sends a recording start instruction to the memory unit 134 to start recording the record data. Time t1 is the minimum response time from when the recording and playback control unit 1331 sends the playback start trigger to the memory unit 134 until the D/A converter 136 outputs a synthesis signal. The recording and playback control unit 1331 stores information indicating the time t1 that was measured in advance.

When the composite video signal is no longer being input from the detector 1312, the recording and playback control unit 1331 sends a recording stop instruction to the memory unit 134. When the memory unit 134 receives the recording stop instruction, it stops recording the recording data. Furthermore, when the composite video signal is no longer being input from the detector 1312, the recording and playback control unit 1331 controls the path switching unit 1332 to switch the output destination of the recording data to the D/A converter 135, and sends a playback start trigger to the memory unit 134.

When the memory unit 134 receives a playback start trigger from the recording and playback control unit 1331, it outputs the recorded data. At this time, the output destination of the recorded data is the D/A converter 135, so a transmission signal is output from the D/A converter 135 to the transmission unit 14. The path along which the transmission signal is output from the D/A converter 135 to the transmission unit 14 is an example of the second path. When the recording and playback control unit 1331 receives a received video signal from the detector 1313, it controls the path switching unit 1332 to switch the output destination of the recorded data to the D/A converter 136. The recording and playback control unit 1331 repeats these processes.

Here, the recording and playback of the recorded data will be explained using the timing chart shown in Figure 3. In the figure, (1) is a timing chart showing the time when the received signal is input to the signal recording and playback device 13. It is input when the value is high, and is not input when the value is low. (2) is a timing chart showing the time when the received video signal is output. It is output when the value is high, and is not output when the value is low. (3) is a timing chart showing the time when the composite video signal is output. It is output when the value is high, and is not output when the value is low.

(4) is a timing chart showing the timing when the control unit 133 sends a playback start trigger to the storage unit 134. The playback start trigger is valid when the value is high, and invalid when the value is low. (5) is a timing chart showing the time when the synthesis signal is output. It is output when the value is high, and is not output when the value is low. (6) is a timing chart showing the time when the synthesis signal is output. It is output when the value is high, and is not output when the value is low. (7) shows the time when the record data is recorded by the recording start instruction and recording stop instruction. It is recorded when the value is high, and is not recorded when the value is low. (8) is a timing chart showing the time when the transmission signal is output. It is output when the value is high, and is not output when the value is low.

When a received signal of frequency f1 is input to the synthesizer 131, the detector 1313 outputs the received video signal to the control unit 133. At the rising edge of the received video signal, the recording and playback control unit 1331 of the control unit 133 sends a playback start trigger to the memory unit 134 to output the recorded data. At this time, the output destination of the recorded data is the D/A converter 136, but since the memory unit 134 does not store the recorded data at this point, no synthesis signal is output from the D/A converter 136. Therefore, the synthesis signal output from the synthesizer 1311 is a signal of frequency f1.

The composite signal output from the combiner 1311 is A/D converted by the A/D converter 132, and the recording data is sent to the storage unit 134. After a time t1 has elapsed since the recording and playback control unit 1331 sent a playback start trigger at the rising edge of the received video signal, the recording and playback control unit 1331 sends a recording start instruction to the storage unit 134 to start recording the recording data. At the falling edge of the composite video signal, the recording and playback control unit 1331 sends a recording stop instruction to the storage unit 134 to stop recording the recording data. In other words, the recording data of the composite signal with frequency f1 from time t1 after the rising edge of the received video signal to the falling edge of the composite video signal is recorded in the storage unit 134.

The recording and playback control unit 1331 also controls the path switching unit 1332 at the falling edge of the composite video signal to switch the output destination of the recorded data to the D/A converter 135. Furthermore, the recording and playback control unit 1331 sends a playback start trigger to the storage unit 134 at the falling edge of the composite video signal to output the recorded data. After a time t1 has elapsed since the recording and playback control unit 1331 sent the playback start trigger at the falling edge of the composite video signal, a transmission signal of frequency f1 is output from the D/A converter 135 to the transmission unit 14. The minimum response time from when the recording and playback control unit 1331 outputs the playback start trigger to the storage unit 134 until the D/A converter 135 outputs the transmission signal is the same time t1 as the minimum response time until the D/A converter 136 outputs the synthesis signal.

When the memory unit 134 receives a playback start trigger from the recording and playback control unit 1331, it outputs the recorded data. After outputting the data length of the recorded data, the memory unit 134 repeats the process of outputting the recorded data from the beginning again. This makes it possible to make the transmission signal a continuous wave.

When a received signal of frequency f2 is input to the synthesis unit 131, the detector 1313 outputs the received video signal to the control unit 133. The recording and playback control unit 1331 of the control unit 133 sends a playback start trigger to the memory unit 134 at the rising edge of the received video signal to output the recorded data. At this time, since the memory unit 134 is storing the recorded data of the synthesized signal of frequency f1, a synthesis signal of frequency f1 is output from the D/A converter 136. In addition, the recording and playback control unit 1331 controls the path switching unit 1332 at the rising edge of the received video signal to switch the output destination of the recorded data to the D/A converter 136.

The synthesizer 1311 outputs a synthetic signal obtained by synthesizing a synthesizing signal of frequency f1 and a received signal of frequency f2. Hereinafter, the frequency of the synthetic signal obtained by synthesizing a synthesizing signal of frequency fi and a received signal of frequency fj is expressed as frequency fi+fj. The synthetic signal output from the synthesizer 1311 is A/D converted by the A/D converter 132, and the recording data is sent to the storage unit 134. The recording and playback control unit 1331 sends a recording start instruction to the storage unit 134 to start recording the recording data after time t1 has elapsed since sending a playback start trigger at the rising edge of the received video signal. The recording and playback control unit 1331 sends a recording stop instruction to the storage unit 134 at the falling edge of the synthetic video signal to stop recording the recording data. In other words, the recording data of the synthetic signal of frequency f1+f2 from time t1 after the rising edge of the received video signal to the falling edge of the synthetic video signal is recorded in the storage unit 134.

The recording and playback control unit 1331 also controls the path switching unit 1332 at the falling edge of the composite video signal to switch the output destination of the recorded data to the D/A converter 135. Furthermore, the recording and playback control unit 1331 sends a playback start trigger to the storage unit 134 at the falling edge of the composite video signal to output the recorded data. After a time t1 has elapsed since the recording and playback control unit 1331 sent the playback start trigger at the falling edge of the composite video signal, a transmission signal of frequency f1+f2 is continuously output from the D/A converter 135 to the transmission unit 14.

When a received signal of frequency f3 is input to the synthesis unit 131, the detector 1313 outputs the received video signal to the control unit 133. The recording and playback control unit 1331 of the control unit 133 sends a playback start trigger to the memory unit 134 at the rising edge of the received video signal to output the recorded data. At this time, since the memory unit 134 is storing the recorded data of the synthesized signal of frequency f1 + f2, a synthesis signal of frequency f1 + f2 is output from the D/A converter 136. In addition, the recording and playback control unit 1331 controls the path switching unit 1332 at the rising edge of the received video signal to switch the output destination of the recorded data to the D/A converter 136.

The synthesizer 1311 outputs a synthesized signal obtained by synthesizing a synthesizing signal of frequency f1+f2 and a received signal of frequency f3. The synthesized signal output from the synthesizer 1311 is A/D converted by the A/D converter 132, and the recorded data is sent to the storage unit 134. The recording and playback control unit 1331 sends a recording start instruction to the storage unit 134 to start recording the recorded data after time t1 has elapsed since sending a playback start trigger at the rising edge of the received video signal. The recording and playback control unit 1331 sends a recording stop instruction to the storage unit 134 at the falling edge of the synthesized video signal to stop recording the recorded data. In other words, the recorded data of the synthesized signal of frequency f1+f2+f3 from time t1 after the rising edge of the received video signal to the falling edge of the synthesized video signal is recorded in the storage unit 134.

The recording and playback control unit 1331 also controls the path switching unit 1332 at the falling edge of the composite video signal to switch the output destination of the recorded data to the D/A converter 135. Furthermore, the recording and playback control unit 1331 sends a playback start trigger to the storage unit 134 at the falling edge of the composite video signal to output the recorded data. After a time t1 has elapsed since the recording and playback control unit 1331 sent the playback start trigger at the falling edge of the composite video signal, a transmission signal of frequency f1+f2+f3 is continuously output from the D/A converter 135 to the transmission unit 14.

The signal recording and reproducing device 13 performs the same process on the received signals of frequencies f4 to fn that are subsequently received. Finally, the transmission signals of frequencies f1+f2+f3+...+fn are continuously output to the transmitting unit 14. In this way, the control unit 133 switches the output destination of the recorded data to the D/A converter 136 while the composite signal is being generated, and switches the output destination of the recorded data to the D/A converter 135 while the composite signal is not being generated. The signal recording and reproducing device 13 can output the transmission signal at the falling edge of the composite video signal, that is, after the time t1 has elapsed since the recording of the recorded data is completed, so that the deterioration of the real-time nature of the reproduced signal (transmitted signal) due to the processing time can be suppressed compared to the case where each received signal is converted to recorded data and stored, and the recording data is added each time.

The flow of the process executed by the signal recording and reproducing device 13 will now be described with reference to FIG. 4. The signal recording and reproducing process shown in FIG. 4 starts when the power is turned on to the signal recording and reproducing device 13. If no received signal is input from the receiving unit 12 to the signal recording and reproducing device 13 (step S11; NO), the process proceeds to step S30.

When a received signal is input from the receiving unit 12 to the signal recording and reproducing device 13 (step S11; YES), the received signal is distributed and input to the combiner 1311 and detector 1313 of the combining unit 131 of the signal recording and reproducing device 13. The combiner 1311 combines the received signal with a combining signal (described below) to generate a combined signal. The combined signal is input to the detector 1312. The detector 1313 of the combining unit 131 of the signal recording and reproducing device 13 detects the received signal and starts outputting a digitized received video signal. At the same time, the detector 1312 detects the combined signal and starts outputting a digitized combined video signal (step S12).

When the recording and playback control unit 1331 receives a received video signal from the detector 1313, it controls the path switching unit 1332 to switch the output destination of the recorded data to the D/A converter 136 (step S13) and sends a playback start trigger to the memory unit 134 (step S14). Step S13 is an example of a switching step. If there is no recorded data stored in the memory unit 134 (step S15; NO), the process proceeds to step S17. For example, if a received signal of frequency f1 is input to the signal recording and playback device 13 in step S11, there is no recorded data stored in the memory unit 134, so the process proceeds to step S17.

If there is recorded data stored in the memory unit 134 (step S15; YES), when the memory unit 134 receives a playback start trigger from the recording and playback control unit 1331, it outputs the recorded data to the D/A converter 136 (step S16). Step S15 is an example of an output step. For example, if a received signal of frequency f2 is input to the signal recording and playback device 13 in step S11, the memory unit 134 stores the recorded data of the composite signal of frequency f1, so in step S16 the memory unit 134 outputs the recorded data of the composite signal of frequency f1 to the D/A converter 136.

If time t1 has not elapsed since sending the playback start trigger in step S14 (step S17; NO), the recording and playback control unit 1331 repeats step S17 to wait for time t1 to elapse. If time t1 has elapsed since sending the playback start trigger in step S14 (step S17; YES), the recording and playback control unit 1331 sends a recording start instruction to the memory unit 134 (step S18). In addition, the D/A converter 136 outputs a synthesis signal obtained by D/A converting the recorded data to the synthesizer 1311 (step S19). Time t1 is the minimum response time from when the recording and playback control unit 1331 sends the playback start trigger to the memory unit 134 until the D/A converter 136 outputs the synthesis signal.

When the memory unit 134 receives a recording start instruction from the recording and playback control unit 1331, it starts recording the recording data (step S20). Step S20 is an example of a storage step. The combiner 1311 combines the received signal and the signal to be combined, and outputs a combined signal (step S21). Step S21 is an example of a combination step. The combined signal output from the combiner 1311 is distributed and input to the A/D converter 132 and the detector 1312. The A/D converter 132 sends the combined signal, which is A/D converted, to the memory unit 134 as recording data (step S22).

When the signal for synthesis output by the D/A converter 136 ends, or when the input of the received signal from the receiving unit 12 ends, the synthesizer 1131 stops outputting the synthesis signal (step S22A). When the signal for synthesis output by the D/A converter 136 ends, or when the input of the received signal from the receiving unit 12 ends, the detector 1312 stops outputting the synthesis video signal (step S23). Therefore, the synthesis video signal is no longer input from the detector 1312 to the recording and playback control unit 1331. When the synthesis video signal is no longer input from the detector 1312, the recording and playback control unit 1331 sends a recording stop instruction to the storage unit 134 (step S24). When the storage unit 134 receives the recording stop instruction, it stops recording the recording data (step S25). Also, when the composite video signal is no longer input from the detector 1312, the recording and playback control unit 1331 controls the path switching unit 1332 to switch the output destination of the recorded data to the D/A converter 135 (step S26) and sends a playback start trigger to the storage unit 134 (step S27). Step S26 is an example of a switching step. When the storage unit 134 receives a playback start trigger from the recording and playback control unit 1331, it outputs the recorded data to the D/A converter 135 (step S28). Step S27 is an example of an output step. If the time t1 has not elapsed since the playback start trigger was sent in step S27 (step S29; NO), the recording and playback control unit 1331 repeats step S29 to wait for the time t1 to elapse. If the time t1 has elapsed since the playback start trigger was sent in step S27 (step S29; YES), the D/A converter 135 outputs a transmission signal obtained by D/A converting the recorded data to the transmission unit 14 (step S30).

If the signal recording and reproducing device 13 further receives a reception signal of another frequency (step S31; YES), the process returns to step S11 and steps S11 to S31 are repeated. That is, after the signal recording and reproducing device 13 receives a reception signal of frequency f1, f2, ... +fn-1, the process returns to step S11 and steps S11 to S31 are repeated. If the signal recording and reproducing device 13 does not receive a reception signal of another frequency (step S31; NO), the process ends. That is, after the signal recording and reproducing device 13 receives a reception signal of frequency fn, the process ends.

As described above, the signal recording and reproducing device 13 according to this embodiment combines a received signal with a signal for synthesis to generate a synthesized signal, which is then A/D converted and stored as recorded data, and the analog signal obtained by D/A converting the recorded data is output as a signal for synthesis while the synthesized signal is being generated, and as a transmission signal while the synthesized signal is not being generated, thereby making it possible to record an RF signal transmitted using a frequency hopping method and to improve the fidelity and immediacy when reproducing it as a signal containing multiple frequency components.

Note that this disclosure is not limited to the above-described embodiment, and various modifications are of course possible without departing from the gist of this disclosure.

For example, as shown in FIG. 5, the signal recording and reproducing device 13 may be configured to include a switch 138 and a D/A converter 137 instead of the path switching unit 1332, D/A converter 135, and D/A converter 136 of the control unit 133. In this case, the recording data output by the storage unit 134 is input to the D/A converter 137 and D/A converted. The output destination of the analog signal D/A converted by the D/A converter 137 is switched by the switch 138. The signal is output to the combiner 1311 as a synthesis signal. The signal is output to the transmission unit 14 as a transmission signal. The recording and reproducing control unit 1331 controls the switching of the switch 138. The path along which the synthesis signal is output from the switch 138 to the combiner 1311 is an example of the first path. The path along which the transmission signal is output from the switch 138 to the transmission unit 14 is an example of the second path.

In the above embodiment, the storage unit 134 outputs the data length of the recorded data, and then repeats outputting the recorded data from the beginning again, but this is not limited to the above. If it is not necessary to make the transmission signal a continuous wave, the storage unit 134 may be configured to output the recorded data once when it receives a playback start trigger from the recording and playback control unit 1331.

1 signal transmitting/receiving device, 11 receiving antenna, 12 receiving unit, 13 signal recording/reproducing device, 14 transmitting unit, 15 transmitting antenna, 131 combining unit, 132 A/D converter, 133 control unit, 134 memory unit, 135, 136, 137 D/A converter, 138 switch, 1311 combiner, 1312, 1313 detector, 1331 recording/reproducing control unit, 1332 path switching unit.

Claims (6)

a synthesis unit which sequentially receives received signals extracted from RF signals of a plurality of frequencies transmitted by a frequency hopping method, and synthesizes the received signals with a synthesis signal each time the received signals are input to generate a synthesis signal;
a storage unit that stores and outputs recording data obtained by A/D converting the composite signal generated by the synthesis unit;
a control unit that switches between a first path for outputting an analog signal obtained by D/A converting the recorded data output by the storage unit as the synthesis signal and a second path for outputting the analog signal as a transmission signal;
Equipped with
A signal recording and reproducing device, wherein the control unit switches to the first path while the composite signal is being generated, and switches to the second path while the composite signal is not being generated. the combining unit further generates a received video signal by detecting and digitizing the received signal, and a combined video signal by detecting and digitizing the combined signal;
the control unit switches to the first path at a rising edge of the received video signal, and causes the storage unit to output the recorded data, and switches to the second path at a falling edge of the composite video signal, and causes the storage unit to output the recorded data.
2. A signal recording and reproducing apparatus according to claim 1. the control unit causes the storage unit to start recording the record data after a certain time has elapsed since the rising edge of the received video signal, and causes the storage unit to stop recording the record data at the falling edge of the composite video signal;
The certain time is a minimum response time from when the control unit sends a trigger to the storage unit to output the recorded data to when the synthesis signal is output.
3. A signal recording and reproducing apparatus according to claim 2. the storage unit repeats outputting the data length of the recording data and then outputting the recording data from the beginning again.
4. A signal recording and reproducing apparatus according to claim 1. A signal recording and reproducing device according to any one of claims 1 to 4,
a receiving antenna for receiving RF signals of multiple frequencies transmitted by a frequency hopping method;
a receiving unit that extracts the received signal from an RF signal received by the receiving antenna;
A transmitter that converts the transmission signal into an RF signal;
a transmitting antenna for transmitting the RF signal converted by the transmitting unit;
Equipped with
Signal transmitting and receiving device. A signal recording and reproducing method executed by a signal recording and reproducing device to which a received signal extracted from a plurality of RF signals of different frequencies transmitted by a frequency hopping method is input, comprising the steps of:
a combining step of combining the received signal with a combining signal to generate a combined signal each time the received signal is input;
a storage step of storing record data obtained by A/D converting the composite signal generated in the synthesis step;
an output step of outputting the recorded data;
a switching step of switching between a first path for outputting an analog signal obtained by D/A converting the recording data output in the output step as the synthesis signal and a second path for outputting the analog signal as a transmission signal;
Equipped with
A signal recording and reproducing method, wherein the switching step switches to the first path while the composite signal is being generated, and switches to the second path while the composite signal is not being generated.