JP2009111952A - Broadcast signal receiver tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast signal receiver tester capable of accurately reproducing radio wave propagation environments of actual fields and evaluating performance of a broadcast signal receiver disposed on a vehicle and characteristics of a reception antenna connected to the broadcast signal receiver. <P>SOLUTION: The receiver tester comprises a signal recording device 500 equipped with a broadcast signal receiving antenna 510 and a signal recording section 520 to record broadcast signals and a signal reproduction device 600 equipped with a signal reproduction section 620 to reproduce broadcast signals recorded by the signal recording section 520 and a transmission antenna 610 to transmit the reproduced broadcast signals, wherein the signal reproduction section 620 sets reproduction conditions to control and set at least one of delay and gain quantities of the broadcast signals to be transmitted so as to maximize the correlation value of the broadcast signal recorded by the signal recording section 520 and the broadcast signal which is obtained by reproducing the broadcast signal recorded by the signal recording section 520 by the signal reproduction section 620, transmitting the broadcast signal through the transmission antenna 610, and recording the signal again by the signal recording device 520. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast signal receiver test apparatus.

When evaluating the performance of a broadcast signal receiver developed for various broadcast signals, field tests in a moving environment of the vehicle are an important item, particularly when the broadcast signal receiver is mounted on the vehicle. However, this field test requires enormous time and man-hours for preparation and evaluation, and even when the same field test is performed, reproducibility is difficult to maintain, and the same evaluation result may not be obtained. There was a point. In order to solve this problem, a broadcast signal recording and playback device that can once reproduce broadcast signals in a mobile environment in a test room such as an anechoic chamber once a broadcast signal is recorded in a mobile environment is proposed. (Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 6-265587 JP 11-183544 A

  When evaluating the performance of a broadcast signal receiver using broadcast signals recorded by such a broadcast signal recording / playback device, 1) the broadcast signal receiver to be evaluated is installed in the test room, and 2) it is recorded in the field. The broadcast signal is reproduced and transmitted from the transmitting antenna installed in the test room, and the radio wave propagation environment in the field is reproduced in the test room. 3) The broadcast signal received and transmitted is received by the broadcast signal receiver, and the reception performance is improved. It is done by evaluating.

  By the way, when the recorded broadcast signal is played back / transmitted in the test room, the transmitted broadcast signal is affected by the characteristics of the transmitting antenna provided in the test room, and the radio wave propagation environment in the field is accurately reproduced. There is a problem that it is not possible. On the other hand, when evaluating the performance of a broadcast signal receiver, it is important to evaluate the performance including the reception antenna connected to the broadcast signal receiver, but it was transmitted from the transmission antenna installed in the test room. When the broadcast signal is affected by the characteristics of the transmission antenna installed in the test room, the signal received by the broadcast signal receiver is received by the transmission antenna installed in the test room and the broadcast signal receiver. It is influenced by the characteristics of both antennas, and the performance evaluation of the broadcast signal receiver including the receiving antenna connected to the broadcast signal receiver cannot be performed with high accuracy.

  In the present invention, in view of the above points, the radio wave propagation environment in the field is reproduced with high accuracy in the test room, and the performance evaluation of the broadcast signal receiver installed in the vehicle is performed using the reception antenna connected to the broadcast signal receiver. Provided is a broadcast signal receiver test apparatus including characteristics.

  In order to solve the above-mentioned problem, the invention described in claim 1 is provided with a receiving antenna that receives a broadcast signal and a signal recording unit that records the broadcast signal received by the receiving antenna, and the broadcast signal in the field. A signal recording device for recording the broadcast signal recorded by the signal recording unit, and a transmission antenna for transmitting the broadcast signal reproduced by the signal reproduction unit. A broadcast receiver test apparatus comprising: a signal reproduction device for reproducing the broadcast signal recorded in step 1; wherein the signal reproduction unit records the broadcast signal recorded in the signal recording unit and the signal recording unit. The transmission signal is reproduced by the signal reproduction unit, transmitted by the transmission antenna, and retransmitted by the signal recording device so that the correlation value becomes maximum. It is characterized by performing the reproducing condition setting operation for at least one to adjust the settings of the delay amount and the gain amount of the broadcasting signal transmitted from the antenna.

  According to the above configuration, since the broadcast signal recorded in the field can be transmitted without the influence of the transmission antenna installed in the test room, it is connected to the broadcast signal receiver when evaluating the broadcast signal receiver. Evaluation including the characteristics of the receiving antenna is possible.

  The invention according to claim 2 is characterized in that, in claim 1, the reception antenna and the transmission antenna each include a plurality of directional reception antennas and a plurality of directional transmission antennas.

  According to the above configuration, the radio wave propagation environment for a plurality of broadcast signals can be reproduced when performance evaluation of the broadcast signal receiver is performed.

  The invention described in claim 3 is characterized in that, in claim 2, the number of the directional receiving antennas and the number of the directional transmitting antennas are odd and the same.

  According to the said structure, when transmitting a broadcast signal from the transmission antenna installed in the test room, it can prevent that the transmitted broadcast signal opposes and it will reduce the reproducibility of a radio wave propagation environment.

  According to a fourth aspect of the present invention, in the second or third aspect, the plurality of directional receiving antennas are arranged at equal intervals on a circumference of a first circle having a predetermined diameter. The directional transmission antennas are arranged at equal intervals on the circumference of a second circle larger than the diameter of the first circle.

  Further, the invention according to claim 5 is the invention according to claim 4, wherein when performing the reproduction condition setting operation, the center of the first circle where the directional reception antenna is arranged, and the directional transmission antenna are The directional reception antenna and the directional transmission antenna are arranged so that the center of the second circle arranged matches the directional reception antenna and the directional transmission antenna. It is a feature.

  According to the above configuration, the broadcast signal transmitted from each transmission antenna can be received by the corresponding reception antenna, and the reproduction condition setting operation can be performed with high accuracy.

  The invention according to claim 6 is characterized in that, in any one of claims 1 to 5, the reproduction condition setting operation is individually performed for each broadcast signal recorded by the signal recording unit. It is said.

  According to the above configuration, the reproduction condition setting operation can be performed with high accuracy.

  The invention according to claim 7 is the invention according to any one of claims 1 to 5, wherein the reproduction condition setting operation is simultaneously performed on all the broadcast signals recorded simultaneously by the signal recording unit. It is characterized by that.

  According to the above configuration, the reproduction condition setting operation can be performed in a short time. In addition, it is possible to set a reproduction condition that accurately reproduces a radio wave propagation environment in which a plurality of broadcast signals exist simultaneously.

  Furthermore, an invention according to an eighth aspect is characterized in that, in any one of the first to seventh aspects, the signal recording device is mounted on a vehicle.

  According to the above configuration, it is possible to easily record the radio wave propagation environment necessary for performance evaluation of the on-board broadcast signal receiver.

  The radio wave propagation environment in the field can be accurately reproduced in the test room, and the performance evaluation of the broadcast signal receiver installed in the vehicle can be performed including the characteristics of the reception antenna connected to the broadcast signal receiver.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic diagram of a broadcast signal recording operation by the signal recording apparatus of the present invention.

  The broadcast signal is recorded by the observation vehicle RV in which the signal recording device 500 including the reception antenna 510 that receives the broadcast signal and the signal recording unit 520 that records the broadcast signal received by the reception antenna 510 is installed. A broadcast signal necessary for performance evaluation of the receiver is transmitted from the broadcasting station tower BCT and travels in an area where it can be received.

  Here, the receiving antenna 510 receives a direct wave directly reaching the receiving antenna 510 from the broadcasting station radio tower BCT and a reflected wave reflected by a building, a mountain, or the like.

  In FIG. 2, the outline | summary of the observation vehicle RV and the signal recording device 500 in this invention is shown with a top view and a side view.

  In the observation vehicle RV, a signal recording device 500 including a receiving antenna 510, a signal recording unit 520, an imaging unit 530, a GPS antenna 541, a GPS receiving unit 542, and a traveling state detection unit 550 is installed.

  The receiving antenna 510 is an antenna that receives a broadcast signal, and includes an odd number of directional receiving antennas. In this embodiment, directional receiving antennas 510A to 510E, which are five directional receiving antennas, are provided. These directional reception antennas 510A to 510E are installed at equal intervals on the circumference of a circle C1 (first circle) centering on the center CT1 of the reception antenna 510. In this embodiment, since the number of directional transmission antennas 510A to 510E is 5, they are installed on the circumference of the circle C1 at intervals of 72 degrees.

  The reason for the odd number of antennas is to prevent the broadcast signals transmitted from the directional transmission antennas provided in the test room from facing each other when the broadcast signal recorded by the signal recording device 500 is reproduced and transmitted in the test room. Because. This will be described later again.

  The signal recording unit 520 records the broadcast signal received by the receiving antenna 510. Here, the broadcast signal is recorded for each of the directional receiving antennas 510A to 510E. In the present embodiment, five broadcast signals A to B corresponding to the directional receiving antennas 510A to 510E are recorded.

  The imaging unit 530 is a small camera that captures a front image of the observation vehicle RV, and captures a front image during recording of a broadcast signal. The captured video signal is recorded in the signal recording unit 520.

  The GPS antenna 541 receives a so-called GPS signal and outputs it to the GPS receiver 542.

  The GPS receiver 542 receives the GPS signal output from the GPS antenna 541 and outputs latitude / longitude data. The output latitude / longitude data is output to the signal recording unit 520.

  The traveling state detection unit 550 includes a vehicle speed sensor 551, an acceleration sensor 552, and a gyro 553 (all not shown). The vehicle speed sensor 551 detects the vehicle speed of the observation vehicle RV and outputs a vehicle speed signal. The acceleration sensor 552 detects the acceleration in the front-rear direction and the left-right direction of the observation vehicle RV, and outputs acceleration signals in the front-rear direction and the left-right direction. The gyro 553 detects the direction of the observation vehicle RV and outputs a direction signal. The output vehicle speed signal, acceleration signal, and direction signal are recorded in the signal recording unit 520.

  FIG. 3 shows a block diagram of the signal recording unit 520.

  The signal recording unit 520 includes a broadcast signal receiving unit 521, a control unit 522, and a storage unit 523.

  The broadcast signal receiving unit 521 includes a receiving unit 521a, a frequency converting unit 521b, a filter unit 521c, and an AD converting unit 521d.

  The receiving unit 521a receives a broadcast signal received by the directional receiving antenna 510A and performs signal processing such as high-frequency amplification.

  The frequency conversion unit 521b receives the output signal of the reception unit 521a and down-converts the frequency.

  The filter unit 521c receives the output signal of the frequency conversion unit 521b and performs a filter process for extracting only a necessary signal.

  The AD conversion unit 521d receives the output signal of the filter unit 521c and converts it into a digital signal.

  The control unit 522 takes in the video signal output from the imaging unit 530, performs necessary image processing, and outputs the video signal to the storage unit 523 at a predetermined timing. In addition, the GPS signal output from the GPS receiver 542 and the vehicle speed signal, acceleration signal, and direction signal output from the vehicle speed sensor 551, acceleration sensor 552, and gyro 553 of the traveling state detector 550 are received, and the position of the host vehicle is received. Information is calculated and output to the storage unit 523 at a predetermined timing. Further, before the broadcast signal is recorded, the filter parameter is output to the filter unit 521c in order to set a filter parameter suitable for the broadcast signal to be recorded.

  The storage unit 523 stores output data output from the AD conversion unit 521d at a predetermined timing. Further, the video signal and position information output from the control unit 522 are stored at a predetermined timing.

  Note that the broadcast signal receiving unit 521 is provided for each of the directional receiving antennas 510A to 510E. That is, in this embodiment, five broadcast signal receiving units 521 are provided, and the storage unit 523 includes The output signal of each AD converter 521d of the broadcast signal receiver 521 is stored.

  FIG. 4 is a plan view showing an outline of the test room TR in which the signal reproduction device 600 for reproducing the recorded broadcast signal is installed.

  In the test room TR, a signal reproduction apparatus 600 including directional transmission antennas 610A to 610E (transmission antenna 610), signal reproduction units 620A to 620E constituting the signal reproduction unit 620, and a control unit 630 are installed.

  Directional transmission antennas 610A to 610E are directional antennas that transmit broadcast signals recorded by signal recording unit 520 and reproduced by signal reproduction units 620A to 620E described later. Here, the number of directional transmission antennas 610A to 610E is the same as the number of directional reception antennas 510A to 510E installed in the observation vehicle RV, and a circle centering on a point (CT2 in FIG. 4) of the test room TR. It is installed at equal intervals on the circumference of C2 (second circle). Here, if the number of directional transmission antennas is an even number, the directional transmission antennas face each other around the center CT2, and transmitted broadcast signals face each other. In order to avoid this, the number of directional transmission antennas is set to an odd number. In this embodiment, since the number of directional transmission antennas 610A to 610E is 5, they are installed on the circumference of the circle C2 at intervals of 72 degrees.

  Here, the broadcast signal received and recorded by the directional receiving antenna 510A is reproduced by a signal reproducing unit 620A described later and transmitted from the directional transmitting antenna 610A. Similarly, the broadcast signal received and recorded by the directional reception antenna 510B is reproduced by the signal reproduction unit 620B and transmitted from the directional transmission antenna 610B, and the broadcast signal received and recorded by the directional reception antenna 510C is The broadcast signal reproduced by the signal reproduction unit 620C, transmitted from the directional transmission antenna 610C, received and recorded by the directional reception antenna 510D is reproduced by the signal reproduction unit 620D, transmitted from the directional transmission antenna 610D, and directed. The broadcast signal received and recorded by the directional reception antenna 510E is reproduced by the signal reproduction unit 620E and transmitted from the directional transmission antenna 610E.

  Further, when performing the reproduction condition setting operation described later, a broadcast signal transmitted from the directional transmission antenna A is received by the directional reception antenna A, and similarly, the broadcast signals transmitted from the directional transmission antennas B to E are respectively received. The signal is received by the directional receiving antennas B to E. For this reason, the center CT1 of the circle C1 in which the directional receiving antennas A to E face the directional transmitting antennas A to E, respectively, and the directional receiving antennas 510A to 510E are arranged, and the directional transmitting antenna 610A. The observation vehicle RV is arranged so that the centers CT2 of the circles C2 on which ˜610E are arranged coincide.

  The signal reproduction units 620A to 620E reproduce the broadcast signal A to broadcast signal E recorded by the signal recording unit 520, respectively, and all have the same configuration. Hereinafter, the signal reproducing unit 620B will be described as a representative example.

  The signal reproduction unit 620B includes a broadcast signal transmission unit 621, a reproduction control unit 622, a storage unit 623, a transmission signal control unit 624, and a delay gain control unit 625.

  FIG. 5 shows a detailed block diagram of the signal reproducing unit 620B together with a block diagram of the signal recording unit 520.

  The storage unit 623 stores a broadcast signal received by the directional antenna 510B among the broadcast signals recorded by the signal recording unit 520. Here, the recorded broadcast signal is moved from the signal recording unit 520 to the signal reproduction unit 620B via a network (not shown) or via a storage medium.

  The reproduction control unit 622 reproduces the broadcast signal stored in the storage unit 623 based on a signal from the control unit 630 described later.

  The broadcast signal transmission unit 621 receives the broadcast signal stored in the storage unit 623 and transmits the broadcast signal. Here, the broadcast signal transmission unit 621 includes a DA conversion unit 621d, a filter unit 621c, a frequency conversion unit 621b, and a transmission unit 621a.

  The DA conversion unit 621d receives the broadcast signal stored in the storage unit 623 as a digital signal, converts it into an analog signal, and outputs it.

  The filter unit 621c receives the output signal of the DA conversion unit 621d, removes unnecessary noise components, and outputs the result.

  The frequency converter 621b receives the output signal of the filter 621c, up-converts the signal to a frequency necessary for wireless transmission, and outputs the signal.

  The transmission unit 621a receives the output signal of the frequency conversion unit 621b, amplifies the signal necessary for wireless transmission, and outputs the amplified signal.

  The output signal of the transmission unit 621a is input to the delay gain control unit 625, and is transmitted from the directional transmission antenna 610B after the delay amount and the gain amount are adjusted.

  The transmission signal control unit 624 includes a correlation value calculation unit 624a and a control information storage unit 624b.

  The correlation value calculation unit 624a calculates a correlation value between the broadcast signal stored and reproduced in the storage unit 623 and the broadcast signal that is transmitted from the directional transmission antenna 610B and recorded again by the signal recording unit 520. To the control information storage unit 624b.

  The control information storage unit 624b stores the maximum correlation value calculated by the correlation value calculation unit 624a. Further, the delay amount and gain amount output by the delay gain control unit 625 are stored.

  The delay gain control unit 625 includes a delay control unit 625a and a gain control unit 625b, and performs a reproduction condition setting operation for adjusting a time delay amount and a gain amount (output power) of a broadcast signal transmitted from the directional transmission antenna 610B. Do. This adjustment is performed so that the correlation value between the broadcast signal stored and reproduced in the storage unit 623 and the broadcast signal transmitted from the directional transmission antenna 610B and recorded again by the signal recording unit 520 is maximized. Done. When the correlation value becomes maximum, the delay amount and the gain amount are output to the control information storage unit 624b.

  The signal reproduction unit 620B has been described above as a representative, but the reproduction condition setting operation is individually performed for the signal reproduction units 620A, 620C, 620D, and 620E. Thereby, in each signal reproduction | regeneration part 620A-620E, the delay amount and gain amount which exclude the characteristic of the directional transmission antennas 610A-610E at the time of broadcast signal reproduction | regeneration are set.

  The control unit 630 selects a signal reproduction unit to be reproduced from the signal reproduction units 620A to 620E, and performs timing control of the reproduction operation of the selected signal reproduction units 620A to 620E and the recording operation of the signal recording unit 520.

  FIG. 6 shows a schematic diagram of an evaluation test of the evaluation object receiver RCV in the test room TR.

  When the evaluation test of the evaluation target receiver RCV is performed after the delay amount and the gain amount at the time of reproduction of the broadcast signal are set by the reproduction condition setting operation, the test vehicle TV in which the evaluation target receiver RCV is mounted on the test room TR Install in. At this time, the receiving antenna ANT connected to the evaluation target receiver RCV is arranged so as to be positioned on the center CT2 of the circle C2 in which the directional transmitting antennas 610A to 610E are arranged on the circumference. In this state, broadcast signals A to E recorded by the signal recording unit 520 are reproduced by the signal reproduction units 620A to 620E and transmitted from the directional transmission antennas 610A to 610E to evaluate the reception performance of the evaluation target receiver. To do.

  The test vehicle TV is provided with a display unit 721 such as a liquid crystal display, an image reproduction unit 722, and a storage unit 723. Here, the storage unit 723 stores image data of a front image captured by the imaging unit 530 during recording of the broadcast signal by the observation vehicle RV, and the image reproduction unit 722 converts the image data into a video signal. Is reproduced and displayed on the display unit 721. Here, the reproduction of the image data is performed in synchronization with the reproduction / transmission of the broadcast signal by the signal reproduction units 620A to 620E based on the control signal output from the control unit 630.

  Next, broadcast signal recording and playback operations will be described using a flowchart.

  FIG. 7 shows a flowchart of broadcast signal recording operation by the signal recording apparatus 500 in the field.

  In step S101, the observation vehicle RV starts to travel. After this, the flow moves to step S102.

  In step S102, broadcast signal recording is started. Recording of the broadcast signal is started by manual operation when, for example, the observation vehicle RV enters an area where the broadcast signal necessary for the evaluation test of the evaluation target receiver RCV in the test room TR is transmitted. . After this, the flow moves to step S103.

  In step S103, it is determined whether recording of the broadcast signal has been completed. Recording of the broadcast signal is ended by a manual operation when, for example, the observation vehicle RV goes out of the area where the broadcast signal necessary for the evaluation test of the evaluation target receiver RCV in the test room TR is transmitted. After this, the flow moves to step S104.

  In step S104, the broadcast signal recording operation ends.

  FIG. 8 shows a flowchart of the broadcast signal reproduction condition setting operation before the evaluation test of the evaluation target receiver RCV.

  In step S201, 1 is set to an index i that identifies a plurality of directional reception antennas, a plurality of directional transmission antennas, and a plurality of signal transmission units. In the present embodiment, i = 1 to 5 and when i = 1, the directional receiving antenna is the directional receiving antenna 510A, the directional transmitting antenna is the directional transmitting antenna 610A, and the signal reproducing unit is the signal reproducing unit 620A. And Similarly, the directional reception antenna for i = 2 is defined as the directional reception antenna 510B, the directional transmission antenna as the directional transmission antenna 610B, and the signal reproduction unit as the signal reproduction unit 620B. The same shall apply hereinafter. After this, the flow moves to step S202.

  In step S202, in a broadcast signal recording operation in the field, a broadcast signal (hereinafter, referred to as a directional reception antenna 510B, hereinafter referred to as the i-th reception antenna) received and recorded by a directional reception antenna corresponding to the index i The field recording signal is reproduced by a signal reproduction unit (for example, signal reproduction unit 620B, hereinafter referred to as i-th signal reproduction unit) corresponding to the index i, and a directional transmission antenna (for example, directional signal) corresponding to the index i is reproduced. Transmitting antenna 610B, hereinafter referred to as i-th transmitting antenna). After this, the flow moves to step S203.

  In step S203, the field recording signal transmitted from the i-th transmission antenna in step S202 is recorded again by the signal recording unit 520. Hereinafter, this signal is referred to as a laboratory recording signal. After this, the flow moves to step S204.

  In step S204, a correlation value between the field recording signal and the laboratory recording signal is calculated. After this, the flow moves to step S205.

  In step S205, the magnitude of the correlation value calculated in step S204 is determined. If the correlation value is the maximum, the flow moves to step S207. On the other hand, if the correlation value is not the maximum, the flow moves to step S206. The determination of the magnitude of the correlation value can be realized by a known method such as a method in which the difference between the previously calculated correlation value and the currently calculated correlation value converges within a predetermined error.

  In step S206, the time delay amount and the gain amount of the field recording signal transmitted from the i-th transmitting antenna are adjusted so that the correlation value between the field recording signal and the laboratory recording signal becomes large. After this, the flow returns to step S202, and steps from step S202 to step S205 are repeated again.

  In step S207, in order to confirm the delay amount, gain amount, and correlation value set in steps up to step S206, the field recording signal received and recorded by the i-th receiving antenna is reproduced by the i-th signal reproducing unit, i Transmit from transmit antenna. After this, the flow moves to step S208.

  In step S208, the signal recording unit 520 records again the reproduction signal transmitted from the i-th transmitting antenna. After this, the flow moves to step S209.

  In step S209, a correlation value between the field recording signal and the laboratory recording signal is calculated, and the set delay amount, gain amount, and the calculated correlation value are stored in the control information storage unit 624b in the transmission signal control unit 624. Remembered. After this, the flow moves to step S210.

  In step S210, it is determined whether or not the operations in steps S202 to S209 have been performed for all antennas. When the operations in steps S202 to S209 are performed for all antennas (i = N, N: number of antennas), the flow proceeds to step S212. On the other hand, when the operations in steps S202 to S209 are not performed for all antennas (i <N), the flow proceeds to step S211.

  In step S211, an index i indicating an antenna for performing the operations in steps S202 to S209 is set. After this, the flow returns to step S202, and the same operation is performed for the new antenna i.

  In step S212, the reproduction condition setting operation ends.

  By the above operation, the error between the broadcast signal recorded in the field and the signal when the recorded broadcast signal is transmitted from the directional transmission antennas 610A to 610E installed in the test room TR and recorded again is set to the minimum. When reproducing and transmitting the broadcast signal, the influence of the characteristics of the directional transmission antennas 610A to 610E installed in the test room TR can be eliminated or minimized. Thereby, in the subsequent evaluation test of the evaluation target receiver RCV in the test room TR, it is possible to perform an evaluation test including the characteristics of the antenna ANT connected to the evaluation target receiver RCV.

  FIG. 9 shows a flowchart of an evaluation test of the evaluation target receiver RCV performed after the reproduction condition setting operation is completed.

  In step S301, a field recording signal is transmitted from the selected directional transmission antenna. After this, the flow moves to step S302.

  In step S302, the reception performance of the evaluation target receiver RCV with respect to the transmitted field recording signal is evaluated. This evaluation can be performed in real time using received signal strength, fading, S / N ratio, etc. as an index, or can be performed after recording the received signal of the receiver RCV to be evaluated. After this, the flow moves to step S303.

  In step S303, evaluation end determination is performed. When the evaluation is finished, the flow moves to step S304. On the other hand, when the evaluation is continued, the flow returns to step S302.

In step S304, the reception performance evaluation test of the receiver RCV to be evaluated ends.
[Example 2]
In the above-described embodiment, the reproduction condition setting operation is performed for each of the signal reproduction units 620A to 620E. In this embodiment, all broadcast signals (field recording signals) received and recorded simultaneously by the directional receiving antennas 510A to 510E are simultaneously reproduced by the signal reproducing units 620A to 620E and transmitted simultaneously from the directional transmitting antennas 610A to 610E. In this embodiment, the reproduction condition setting operations in the signal reproduction units 620A to 620E are performed simultaneously.

  Since the present embodiment is different only in the operation flow from the above-described embodiment, only the operation flow will be described below.

  FIG. 10 shows a flowchart of the reproduction condition setting operation in the present embodiment.

  In step S401, in the broadcast signal recording operation in the field, broadcast signals (field recorded signals) simultaneously received and recorded by the respective directional receiving antennas 510A to 510E are simultaneously reproduced by the respective signal reproducing units 620A to 620E, and are directed to the respective directivity. Transmit from the transmitting antennas 610A to 610E. After this, the flow moves to step S401.

  In step S402, the field recording signals transmitted from the directional transmission antennas 610A to 610E in step S401 are recorded again (lab recording signals) by the signal recording unit 520. After this, the flow moves to step S403.

  In step S403, the correlation value between the field recording signal and the laboratory recording signal is calculated in each of the signal reproducing units 620A to 620E. After this, the flow moves to step S404.

  In step S404, the magnitude of the correlation value calculated in step S403 is determined. If the correlation value is the maximum, the flow moves to step S406. On the other hand, if the correlation value is not the maximum, the flow moves to step S405. The determination of the magnitude of the correlation value can be realized by a known method such as a method in which the difference between the previously calculated correlation value and the currently calculated correlation value converges within a predetermined error.

  In step S405, the time delay amount and gain amount of the field recording signal transmitted from each of the directional transmission antennas 610A to 610E are adjusted so that the correlation value between the field recording signal and the laboratory recording signal becomes large. After this, the flow returns to step S401 and repeats steps S401 to S404 again.

  In step S406, in order to confirm the delay amount, gain amount, and correlation value set in steps up to step S405, broadcast signals (field recording signals) received and recorded by the directional receiving antennas 510A to 510E It reproduces | regenerates simultaneously with the reproducing parts 620A-620E, and transmits from each directional transmission antenna 610A-610E. After this, the flow moves to step S407.

  In step S407, the field recording signal transmitted from each of the directional transmission antennas 610A to 610E in step S406 is recorded again (test room recording signal) by the signal recording unit 520. After this, the flow moves to step S408.

  In step S408, in each of the signal reproduction units 620A to 620E, a correlation value between the field recording signal and the laboratory recording signal is calculated, and the set delay amount, gain amount, and the calculated correlation value are used as each signal reproduction unit. The information is stored in the control information storage unit 624b in the transmission signal control unit 624 of 620A to 620E. After this, the flow moves to step S409.

  In step S409, the reproduction condition setting operation ends.

  By the above operation, the error between the broadcast signal recorded in the field and the signal when the recorded broadcast signal is transmitted from the directional transmission antennas 610A to 610E installed in the test room TR and recorded again is set to the minimum. When the broadcast signal is reproduced / transmitted, the influence of the characteristics of the directional transmission antennas 610A to 610E installed in the test room TR can be eliminated or minimized. Thereby, in the subsequent evaluation test of the evaluation target receiver RCV in the test room TR, it is possible to perform an evaluation test including the characteristics of the antenna ANT connected to the evaluation target receiver RCV.

Further, in this embodiment, since the reproduction condition setting operation in each of the signal reproduction units 620A to 620E is performed at the same time, the reproduction condition setting operation can be performed in a short time. In addition, it is possible to set a reproduction condition that accurately reproduces a radio wave propagation environment in which a plurality of broadcast signals exist simultaneously.
[Example 3]
In the embodiment described above, the reproduction condition setting operation is performed for each of the signal reproduction units 620A to 620E. In Example 2, the reproduction condition setting operation in each of the signal reproduction units 620A to 620E is performed simultaneously. The present embodiment is an embodiment in which the reproduction condition setting operation in each of the signal reproduction units 620A to 620E is simultaneously performed again after performing the reproduction condition setting operation for each of the signal reproduction units 620A to 620E. The delay amount and the gain amount set in the reproduction condition setting operation are values obtained when the reproduction condition setting operation is performed for each of the signal reproduction units 620A to 620E and when the signal reproduction units 620A to 620E are performed simultaneously. The information is stored in the control information storage unit 624b of the signal reproduction units 620A to 620E. Thereby, it becomes possible to arbitrarily select a delay amount and a gain amount suitable for the evaluation test.

  The reproduction condition setting operation in this embodiment can be realized by performing the operation shown in the flowchart of FIG. 10 after the operation shown in the flowchart of FIG.

  As mentioned above, although the Example of this invention was explained in full detail with drawing, an Example is only an illustration of this invention and this invention is not limited only to the structure of an Example. Accordingly, it goes without saying that design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

  For example, the block diagram of the signal recording unit 520 illustrated in FIG. 3 and the signal reproducing unit 620B illustrated in FIG. 5 is an example, and the block diagram is limited to that illustrated in FIGS. It is not something.

  Further, the signal reproducing units 620A to 620E may be a single signal reproducing unit that can independently reproduce a plurality of broadcast signals.

  Further, the number of directional reception antennas and directional transmission antennas is not limited to that shown in the embodiments and examples, and any number can be set.

  Moreover, the signal which the driving | running | working state detection part 550 detects is not limited to what was shown in embodiment.

It is an outline figure of broadcast signal recording operation in the field by the signal recording device in an embodiment of the present invention. It is a schematic diagram of a signal recording device and an observation vehicle in an embodiment of the present invention. It is a block diagram of the signal recording device in the embodiment of the present invention. It is a block diagram of the signal reproducing | regenerating apparatus in embodiment of this invention. It is a block diagram of the signal recording part and signal reproduction | regeneration part in embodiment of this invention. It is a schematic diagram of the evaluation test of the evaluation object receiver in the embodiment of the present invention. It is a flowchart of recording operation of the broadcast signal in the field by the signal recording device in the embodiment of the present invention. It is a flowchart of the reproduction | regeneration condition setting operation | movement of the broadcast signal by the signal reproduction | regeneration part in embodiment of this invention. It is a flowchart of the evaluation test of the evaluation object receiver RCV in the embodiment of the present invention. It is a flowchart of the reproduction | regeneration condition setting operation | movement of the broadcast signal by the signal reproduction | regeneration part in 2nd Example of this invention.

Explanation of symbols

500 Signal recording device 510 Reception antenna 510A-510E Directional reception antenna 520 Signal recording unit 521 Broadcast signal reception unit 521a Reception unit 521b Frequency conversion unit 521c Filter unit 521d AD conversion unit 522 Control unit 523 Storage unit 530 Imaging unit 541 GPS antenna 542 GPS receiving unit 550 Running state detecting unit 600 Signal reproducing device 610 Transmitting antennas 610A to 610E Directional transmitting antennas 620 and 620A to 620E Signal reproducing unit 621 Broadcast signal transmitting unit 621a Transmitting unit 621b Frequency converting unit 621c Filter unit 621d DA converting unit 622 Playback control unit 623 Storage unit 624 Transmission signal control unit 624a Correlation value calculation unit 624b Control information storage unit 625 Delay gain control unit 625a Delay control unit 625b Gain control unit 630 Control unit 721 Display unit 722 Image reproduction unit 723 Storage unit ANT Reception antenna RCV Evaluation target receiver RV Observation vehicle TV Test vehicle TR Test room

Claims (8)

A receiving antenna for receiving broadcast signals;
A signal recording unit for recording a broadcast signal received by the receiving antenna;
A signal recording device for recording the broadcast signal in the field;
A signal reproduction unit for reproducing the broadcast signal recorded by the signal recording unit;
A transmission antenna for transmitting the broadcast signal reproduced by the signal reproduction unit;
A signal reproducing device for reproducing the broadcast signal recorded in the field in a test room;
A broadcast receiver testing apparatus comprising:
The signal reproduction unit reproduces the broadcast signal recorded by the signal recording unit and the broadcast signal recorded by the signal recording unit by the signal reproduction unit, transmits them by the transmission antenna, and records again by the signal recording device. Performing a reproduction condition setting operation for adjusting and setting at least one of a delay amount and a gain amount of the broadcast signal transmitted from the transmission antenna so that a correlation value with the broadcast signal is maximized,
A broadcast signal receiver testing device characterized by the above. Each of the reception antenna and the transmission antenna includes a plurality of directional reception antennas and a plurality of directional transmission antennas;
The broadcast signal receiver test apparatus according to claim 1. The number of the directional receiving antennas and the number of the directional transmitting antennas are odd and the same number;
The broadcast signal receiver test apparatus according to claim 2. The plurality of directional receiving antennas are arranged at equal intervals on the circumference of a first circle having a predetermined diameter,
A plurality of the directional transmission antennas are arranged at equal intervals on a circumference of a second circle larger than a diameter of the first circle;
The broadcast signal receiver test apparatus according to claim 2 or 3, characterized in that: When performing the reproduction condition setting operation, the center of the first circle in which the directional reception antenna is disposed and the center of the second circle in which the directional transmission antenna is disposed, The directional reception antenna and the directional transmission antenna are arranged so that the directional reception antenna and the directional transmission antenna face each other;
The broadcast signal receiver testing apparatus according to claim 4. The reproduction condition setting operation is performed individually for each broadcast signal recorded by the signal recording unit,
The broadcast signal receiver test apparatus according to claim 1, wherein: The reproduction condition setting operation is simultaneously performed for all the broadcast signals recorded simultaneously by the signal recording unit;
The broadcast signal receiver test apparatus according to claim 1, wherein: The signal recording device is mounted on a vehicle;
The broadcast signal receiver test apparatus according to claim 1, wherein:

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