JP4642878B2 - Radio reception performance evaluation system - Google Patents

Description

  The present invention relates to a radio reception performance evaluation system, and more particularly, to a radio reception performance evaluation system for recording a received voice by moving a radio receiver along a predetermined route and analyzing the data to evaluate the performance of the radio receiver. is there.

  Conventionally, in order to evaluate the radio reception performance, an evaluation is carried out on a vehicle equipped with a radio receiver to be inspected (hereinafter referred to as an evaluation target radio) that is subject to radio reception performance evaluation, with experience in performance evaluation. It was done by the person (human) riding and actually listening to the radio to be evaluated. In this radio reception performance evaluation method, with the evaluation target radio turned on, the vehicle is driven on a predetermined test course, and the evaluator detects that the evaluation target radio generates noise or the output volume changes. It is checked, and an evaluation point divided into 5 or 10 levels on the traveling site is given based on the subjectivity obtained by the evaluator's own experience. Normal broadcast radio waves (radio broadcast radio waves) have little change in radio wave state. However, when the radio wave is received by a mobile receiver such as an in-vehicle radio, various behaviors and changes such as a sudden electric field change and interference occur. Conventionally, these various behaviors and changes are determined by hearing.

  However, in the radio reception performance evaluation by the conventional method as described above, there is a possibility that the judgment criteria between the evaluators are different or the judgment result itself may vary, and the same evaluator. However, variations occur depending on the physical condition of the body, and the correlation is difficult. In addition, there is a problem that it takes time for education and training to train evaluators.

  The present invention has been made in view of the circumstances as described above, and its purpose is to provide a radio reception performance capable of performing a radio reception performance evaluation without variation by quantifying and quantitatively representing a radio reception state. To provide an evaluation system.

ここで、
Ｅi：基準ラジオの音声信号に対する評価対象ラジオの音声信号の相対誤差
Ｖref(t)：基準信号の時間に対する信号レベル
Ｖcar(t)：評価対象信号の時間に対する信号レベル
Ｗ(t)：重み関数
の演算を行うラジオ受信性能評価システムを提供する。 The present invention is connected to a speaker output terminal of a radio receiver to be evaluated mounted on a vehicle, receives a first audio interface for receiving an audio output and converts it into a digital signal, and a first clock means for outputting time information. , Connected to the first audio interface and the first clock means, receiving digitally converted audio data from the first audio interface, and corresponding to the time information outputted from the first clock means A first audio data acquisition means comprising a first computer for storing; and a speaker output terminal of a reference radio receiver installed in a base having a good reception environment, which receives the audio output and converts it into a digital signal The same time information as the second audio interface and the first clock means. Second clock means, connected to the second audio interface and the second clock means, receives digitally converted audio data from the second audio interface, and is output from the second clock means. A second audio data acquisition unit including a second computer that stores the corresponding time information, and evaluation target audio data that is data to be inspected acquired by the first audio data acquisition unit. A first audio data storage unit; a second audio data storage unit for storing the reference audio data acquired by the second audio data acquisition unit; and the evaluation target audio data and the reference audio data as the time information. Compare the time series based on the reference audio data. And audio data analyzing means for determining the performance of the evaluated radio receiver takes the difference between the evaluated audio data that comprises,
The audio data analysis means includes a target data error analysis unit that obtains an error component by taking a difference between the signals of the evaluation target audio data and the reference audio data. In the target data error analysis unit,

here,
Ei: Relative error of the audio signal of the evaluation target radio with respect to the audio signal of the reference radio
Vref (t): signal level with respect to time of reference signal
Vcar (t): Signal level with respect to time of signal to be evaluated
W (t): Weight function
A radio reception performance evaluation system that performs the above calculation is provided.

According to this configuration, it is possible to compare the reception state based on the acquired data between the reference radio receiver having a good reception state (hereinafter referred to as a reference radio) and the evaluation target radio, It is possible to calculate how close the evaluation target audio data is to the reference audio data by calculating the comparison result.

  The present invention as claimed in claim 1 compares the reception state between the reference radio and the evaluation target radio based on the acquired data, and formulates the comparison result to determine the reception state of the evaluation target radio. Since it is determined and evaluated quantitatively, radio reception performance can be evaluated more objectively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a radio reception performance evaluation system according to the present invention. In FIG. 1, reference numeral 1 denotes a broadcasting station that transmits radio waves of radio broadcasting. 2 is a vehicle that travels with the radio to be evaluated, and 3 is a base on which a reference radio is installed. In addition to the evaluation target radio, the vehicle 2 is equipped with first audio data acquisition means for recording audio data indicating the reception state of the evaluation target radio. The vehicle 2 runs on a predetermined test course. In this test course, for example, a place where radio waves from the broadcasting station 1 are difficult to reach, or a place where there are many obstacles and noise due to multipath etc. is likely to be generated, a place where conditions are not necessarily good for receiving broadcasts. It is included. On the other hand, the base 3 is installed in a place where the radio wave from the broadcasting station 1 reaches very well and the conditions for receiving the radio wave are the best. The base 3 is provided with a reference radio and second audio data acquisition means for recording audio data indicating the reception state of the evaluation target radio.

  FIG. 2 is a block diagram illustrating a configuration example of a first audio data acquisition unit that is mounted on the vehicle 2 and records the evaluation target radio and the audio data indicating the reception state of the evaluation target radio. An evaluation object radio 4 mounted on the vehicle 2 is connected to a vehicle antenna 5 to receive broadcast radio waves. Further, a speaker 6 is provided on the output side of the evaluation object radio 4 so as to output sound. The speaker 6 includes two speakers, a left channel speaker 6a and a right channel speaker 6b, connected to speaker output lines (or output terminals) 7a and 7b so that stereo broadcasts can be output. The first audio data acquisition means 8 is connected to the speaker output lines 7a and 7b of the evaluation object radio 4 and receives the audio output (analog signal) of the evaluation object radio 4 and converts it into a digital signal. And a first clock means 10 for outputting time information, and a first audio interface 9 and a first computer 11 connected to the first clock means 10. As the first clock means 10, for example, a GPS (Global Positioning System) receiver is used, and the position information of the vehicle 2 during traveling and the time information at the time of broadcast reception are searched. For example, a laptop computer or other personal computer is used as the first computer 11. The first computer 11 receives audio data digitally converted from the first audio interface 9, and the audio data is output from the first clock means 10. It is stored in a memory or a predetermined storage means in correspondence with the time information.

  FIG. 3 is a block diagram illustrating a configuration example of a second audio data acquisition unit that is installed in the base 3 and records the reference radio and audio data indicating the reception state of the reference radio. A reference radio 12 installed in the base 3 is connected to a high gain antenna 13 to receive broadcast radio waves. A speaker 14 is provided on the output side of the reference radio 12 so as to output sound. The speaker 14 includes two speakers, a left channel speaker 14a and a right channel speaker 14b, connected to speaker output lines (or output terminals) 15a and 15b so that stereo broadcasts can be output. The second audio data acquisition means 16 is connected to the speaker output lines 15a and 15b of the reference radio 12, and receives the audio output (analog signal) of the reference radio 12 and converts it into a digital signal; A second clock means 18 for outputting time information and a second audio interface 17 and a second computer 19 connected to the second clock means 18 are provided. As the second clock means 18, a GPS receiver is used as in the first clock means 10, and the position information of the base 3 and the time information at the time of broadcast reception are searched. For example, a laptop computer or other personal computer is used as the second computer 19. The second computer 19 receives audio data digitally converted from the second audio interface 17, and the audio data is output from the second clock means 18. It is stored in a memory or a predetermined storage means in correspondence with the time information.

  Note that the evaluation target radio 4 and the reference radio 12 are the same type of radio, and the first audio data acquisition means 8 and the second audio data acquisition means 16 use devices having the same configuration and characteristics. The

  FIG. 4 is a block diagram showing a configuration example of the audio data analysis means. This audio data analysis means is realized mainly by a computer installed in a management center (may be the same as the base 3 or may be a facility that is not the same, for example, a laboratory). Examples of hardware resources include an input unit, a control calculation unit, a storage unit, a display unit, and a communication unit connected to a network (Internet). FIG. 4 shows information performed by software using the computer. The system configuration is shown by function from the viewpoint of processing.

  The audio data analysis means includes an evaluation target radio reception data file 21 as a first audio data storage unit for storing the evaluation target audio data acquired by the first audio data acquisition means, and a second audio data acquisition means. And a reference radio reception data file 22 as a second audio data storage unit for storing the acquired reference audio data. The audio data analyzing means has an evaluation object radio calibration data file 23 for storing data for evaluation object radio calibration, and a reference radio calibration data file 24 for storing data for reference radio calibration.

  Further, the audio data analyzing means includes a user interface 25 for inputting / outputting data to / from the user, a data reading unit 26 for reading data from the evaluation target radio reception data file 21 and the reference radio reception data file 22, and an evaluation target. A volume comparison unit 27 that performs a volume comparison operation on data from the radio calibration data file 23 and the reference radio calibration data file 24; a volume calibration data storage unit 28 that stores a comparison result in the volume comparison unit 27; An evaluation target data calibration unit 29 that calibrates the evaluation target data, a data storage unit 30 that stores the calibrated evaluation target data, and a data display unit connected to the data reading unit 26 and the volume calibration data storage unit 28 Data display unit 31 and a user interface connected to data display unit 31 And a face 32.

  Further, the audio data analyzing means performs various analyzes on the evaluation target data, and includes a target data error analysis unit 33, a volume change analysis unit 34, a stereo separation change analysis unit 35, a frequency change analysis unit 36, A noise component analysis unit 37 is included, and the analysis results of these analysis units 33 to 37 are displayed on the analysis result display unit 38. The target data error analysis unit 33 calculates the error component by taking the difference between the signals of the evaluation target audio data and the reference audio data, and outputs the evaluation result of the evaluation target radio 4. The volume change analysis unit 34 obtains a difference in volume change between the evaluation target audio data and the reference audio data by a mathematical expression, and outputs the evaluation result of the evaluation target radio 4. The stereo separation change analysis unit 35 obtains the difference in stereo output separation change between the evaluation target audio data and the reference audio data (that is, the change in separation between left and right) by a mathematical expression, and outputs the evaluation result of the evaluation target radio 4 To do. The frequency change analysis unit 36 obtains the difference in frequency change between the evaluation target audio data and the reference audio data by a mathematical formula, and outputs the evaluation result of the evaluation target radio 4. The noise component analysis unit 37 obtains a difference in noise component due to the influence of multipath or the like between the evaluation target audio data and the reference audio data by a mathematical expression, and outputs the evaluation result of the evaluation target radio 4. In the analysis processing in the various analysis units 33 to 37 described above, the evaluation target audio data and the reference audio data are compared in time series based on time information, and calculation processing is performed.

  The various analysis units 33 to 37 are shown as examples in the present invention, and all the analysis units 33 to 37 described here must be provided, and more analysis units are included. It may be provided.

  The operation of the radio reception performance evaluation system having the above configuration will be described below. First, in a state where broadcast radio waves are emitted from the broadcast station 1, an audio data acquisition operation is performed in the evaluation object radio 4 and the reference radio 12. On the other hand, the vehicle 2 is running on the test course, and the reception data (evaluation target audio data) of the evaluation target radio 4 mounted on the vehicle 2 is recorded by the first audio data acquisition means 8. At this time, since the time is measured by the GPS receiver which is the first clock means 10, the evaluation target audio data is stored in the storage unit of the first computer 11 as time series data.

  On the other hand, in the base 3, the reception data (reference audio data) of the reference radio 12 installed in the base is recorded by the second audio data acquisition means 16. At this time, since the time is measured by the second clock means 18 (also a GPS receiver), the reference audio data is stored in the storage unit of the second computer 19 as time series data. The evaluation target audio data acquisition operation by the evaluation target radio 4 and the reference audio data acquisition operation by the reference radio 12 are performed simultaneously under the time management by the first clock means 10 and the second clock means 18, respectively. Is called.

  The audio data to be evaluated and the reference audio data acquired as described above are sent to a computer in the management center by data communication or through a copy operation to a recording medium such as an optical disk. The computer of the management center constitutes audio data analysis means, and the evaluation target audio data sent here is stored in the evaluation target radio reception data file 21, while the reference audio data is stored in the reference radio reception data file 22. Is done. The evaluation target audio data is also stored in the evaluation target radio calibration data file 23, and is also stored in the reference audio data reference radio calibration data file 24.

  When a data analysis request is input from the user interface 25 in a state where data is stored as described above, the data reading unit 26 receives the evaluation target audio data and the evaluation target audio data from the evaluation target radio reception data file 21 and the reference radio reception data file 22. Reference audio data is read out. Each data is also sent from the evaluation object radio calibration data file 23 and the reference radio calibration data file 24 to the volume comparison unit 27, where the volume comparison operation is performed, and the resulting volume configuration data is obtained. It is stored in the volume calibration data storage unit 28. Then, the evaluation target audio data and the reference audio data read from the evaluation target radio reception data file 21 and the reference radio reception data file 22 by the data reading unit 26 are sent to the evaluation target data calibration unit 29, and the volume calibration data Calibration is performed based on the volume calibration data output from the storage unit 28. The calibrated evaluation target audio data and reference audio data are stored in the data storage unit 30.

  Next, the audio data analysis means performs various types of analysis on the evaluation target data. Hereinafter, some of the various analyzes will be described.

FIG. 5 is a diagram representing waveform examples of the evaluation target audio data and the reference audio data in time series. 5A is a diagram in which the audio data to be evaluated is represented in a waveform in time series, and FIG. 5B is a diagram in which the reference audio data is represented in a waveform in time series. (c) is a diagram in which the evaluation target audio data and the reference audio data are overlapped in time series so as to represent waveforms. In FIG. 5C, T ₁ , T ₂ ,..., T _N indicated at the bottom of the waveform diagram indicate time intervals provided for convenience in order to represent the analysis site. In either figure, the horizontal axis represents the recorded satellite time, and the vertical axis represents the volume. Since FIG. 5A shows the waveform of the audio data acquired at a place where the reception state is good, it is assumed to be an ideal waveform. FIG. 5B shows the influence of the reception status as a phenomenon on the waveform due to the influence of multipath or the change of the electric field strength while traveling on the test course. For example, in FIG. 5 (b), the portion indicated as fading indicates that the electric field strength has changed during reception by the evaluation target radio and that fading has occurred, and the amplitude value changes in the waveform of the evaluation target audio data. give. Further, in FIG. 5B, the portion indicated as noise is affected by multipath while the evaluation target radio is receiving, and data (noise) of another waveform is added to the waveform of the reference audio data. The waveform is shown. This indicates that noise is generated due to the influence of multipath on the reception of the evaluation target radio. The occurrence of noise due to fading or multipath effects as described above appears more clearly in FIG. 5C in which the evaluation target audio data and the reference audio data are superimposed.

  The mathematical formula for determining what component causes the difference between the evaluation target audio data and the reference audio data will be described.

・・・・式（１）
ここで、
Ｅi：基準ラジオの音声信号に対する評価対象ラジオの音声信号の相対誤差
Ｖref(t)：基準信号の時間に対する信号レベル
Ｖcar(t)：評価対象信号の時間に対する信号レベル
Ｗ(t)：重み関数
である。この式においては、Ｅi(i=1,2,3,….,N)を母集団としたＥiの統計期待値が評価対象ラジオの綜合評価の目安になる。この数式の演算は対象データ誤差解析部３３によって実行される。 First, in order to determine how close the evaluation target audio data is to the reference audio data, an operation is performed according to the following equation.

.... Formula (1)
here,
Ei: Relative error of the audio signal of the evaluation target radio with respect to the audio signal of the reference radio Vref (t): Signal level with respect to the time of the reference signal Vcar (t): Signal level with respect to the time of the evaluation target signal W (t): Weight function is there. In this equation, the statistical expected value of Ei with Ei (i = 1, 2, 3,..., N) as a population is a measure of the overall evaluation of the evaluation target radio. The calculation of this mathematical expression is executed by the target data error analysis unit 33.

・・・・式（２）
ここで、
ＶL(t)：左チャンネルにおける信号レベル（音量）
ＶR(t)：右チャンネルにおける信号レベル（音量）
である。この式において、放送電波がモノラル（ＶL(t)＝ＶR(t)）なら式（２）は１、逆位相（ＶL(t)＝−ＶR(t)）なら式（２）は−１、左右でまったく関係のない信号だと０、ステレオの音楽の場合は０と１の間になる。この数式の演算はステレオセパレーション変化解析部３５によって実行される。 Next, in order to obtain stereo separation within each time interval, calculation is performed according to the following equation.

.... Formula (2)
here,
VL (t): Signal level (volume) in the left channel
VR (t): Signal level (volume) in the right channel
It is. In this equation, if the broadcast radio wave is monaural (VL (t) = VR (t)), equation (2) is 1, and if the reverse phase (VL (t) = − VR (t)), equation (2) is −1. It is 0 for signals that are completely unrelated to the left and right, and between 0 and 1 for stereo music. The calculation of this mathematical expression is executed by the stereo separation change analysis unit 35.

・・・・式（３）
ここで、
ｔ_i,ｔ_i-1：時間区間を確定するための時刻データ
である。この数式の演算は音量変化解析部３４によって実行される。 Next, in order to obtain the volume in each time interval, calculation is performed according to the following equation.

.... Formula (3)
here,
t _i, t _i-1 : Time data for determining the time interval. The calculation of this mathematical formula is executed by the volume change analysis unit 34.

・・・・式（４）
ここで、
ｅ^j2π^ft：音声信号の周波数成分
である。この数式の演算は周波数変化解析部３６によって実行される。 Next, in order to obtain the frequency change of the sound within each time interval, calculation is performed by the following equation.

.... Formula (4)
here,
e ^j2 π ^ft : frequency component of the audio signal. The calculation of this mathematical expression is executed by the frequency change analysis unit 36.

・・・・式（５）
ここで、
τ：時間区間内におけるノイズ成分の位置（時間位置）
である。この数式の演算はノイズ成分解析部３７によって実行される。 Next, in order to obtain noise in each time interval, calculation is performed according to the following equation.

.... Formula (5)
here,
τ: Position of the noise component within the time interval (time position)
It is. The calculation of this mathematical expression is executed by the noise component analysis unit 37.

  FIG. 6 is a flowchart for explaining an analysis operation by each analysis unit in an actual analysis operation. In FIG. 6, first, audio data is acquired by running the vehicle 2 (step ST1). In the operation of each analysis unit 33 to 37, the target data error analysis unit 33 performs the calculation according to the equation (1) (step ST2), and whether the statistical expected value of the error Ei obtained next is within a predetermined range. It is checked whether or not (step ST3). As a result, when the error is within a predetermined range, that is, sufficiently small, the evaluation object radio 4 is determined to be OK (step ST4). When it is determined that the evaluation target radio is OK, the evaluation operation is completed because the evaluation target radio 4 is evaluated to have radio reception performance higher than expected. As a result, it is possible to eliminate the waste that the audio data analysis means must perform analysis processing for all items (fading, multipath effects, etc.).

  On the other hand, if the error exceeds the predetermined range in step ST3, section 1 is set in the waveform diagram of FIG. 5 (step ST5), and it is checked whether equation (1) is close to 0 in that section. (Step ST6). Here, “section” represents an individual time section obtained by dividing the entire process (for example, several hours) obtained by running the test course and receiving data into a plurality of predetermined time units, and is acquired from the acquisition start time point. Up to the end point, the section 1, section 2,..., Section N are set, and the audio data analyzing means facilitates the analysis processing. If it is determined by the check process in step ST6 that the expression (1) is close to 0 in the section 1, the section 2 is set by the operation of the section n = n + 1 (step ST7), and the expression (1) is again used in the section 2. Is checked to see if it is close to 0 (step ST6). When the processing of step ST6 and step ST7 is repeated and it is determined that the expression (1) is not close to 0 (the error is large) in any section, the volume change analysis unit 34 and the evaluation object radio 4 and the reference radio 12 and the calculation according to the expression (3) is performed to check whether there is a difference (step ST8). If there is a difference, it is determined that fading has occurred (step ST9). When there is no difference in the check operation (step ST8) and after the fading determination operation (step ST9), the stereo separation change analysis unit 35 performs an operation according to the equation (2) to determine whether there is a difference. Check (step ST10). Accordingly, when there is a difference, it is determined that the stereo separation degree is insufficient (step ST11). When there is no difference in the check operation (step ST10) and after the stereo separation determination operation (step ST11), the frequency change analysis unit 36 performs an operation according to the equation (4) to determine whether there is a difference. Check (step ST12). Thus, if there is a difference, it is determined that the frequency characteristic does not match the reference (step ST13). When there is no difference in the check operation (step ST12) and after the frequency characteristic determination operation (step ST13), the noise component analysis unit 37 performs an operation according to the equation (5) to check whether there is a difference. (Step ST14). If there is a difference, it is determined that noise is generated due to the influence of multipath or the like (step ST15).

  If there is no difference in the check operation (step ST14) and after the noise determination operation (step ST15), it is checked whether or not the currently determined section is N (the last section) (step ST16). . As a result, if the currently determined section is not N, section n = n + 1 is set (step ST17), and the process returns to step ST6 to perform analysis processing by the target data error analysis unit 33. On the other hand, when the section currently determined in the check operation (step ST16) is N, the characteristics of the evaluation target radio are adjusted, and the process returns to step ST1 to acquire audio data by running the vehicle.

  The reception status of the reference radio and the evaluation target radio can be compared based on the acquired data, and the comparison result can be expressed numerically to quantitatively determine and evaluate the reception status of the evaluation target radio. As a result, more objective radio reception performance can be evaluated.

It is a perspective view which shows schematic structure of the radio reception performance evaluation system which concerns on one embodiment of this invention. In the said embodiment, it is a block diagram which shows the structural example of the 1st audio data acquisition means which records the audio data of the evaluation object radio | wireless mounted in the vehicle. In the said embodiment, it is a block diagram which shows the structural example of the 2nd audio data acquisition means which records the audio data of the reference | standard radio installed in the base. In the said embodiment, it is a block diagram which shows the structural example of an audio data analysis means. FIG. 4 is a diagram illustrating waveform examples of evaluation target audio data and reference audio data in time series in the embodiment. 5 is a flowchart illustrating an analysis operation by each analysis unit in an actual analysis operation in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcasting station 2 Vehicle 3 Base 4 Evaluation object radio 5 Vehicle antenna 6 Speaker 6
7a, 7b, 15a, 15b Speaker output line 8 First audio data acquisition means 8
9 first audio interface 10 first clock means 11 first computer 12 reference radio 13 high gain antenna 14 speaker 16 second audio data acquisition means 17 second audio interface 18 second clock means 19 second clock Computer 21 Evaluation target radio reception data file (first audio data storage unit)
22 Reference radio reception data file (second audio data storage)
23 Data file for radio calibration for evaluation 24 Data file for reference radio calibration 25, 32 User interface 26 Data reading unit 27 Volume comparison unit 28 Volume calibration data storage unit 29 Evaluation target data calibration unit 30 Data storage unit 31 Data display unit 33 Target data error analysis unit 34 Volume change analysis unit 35 Stereo separation change analysis unit 36 Frequency change analysis unit 37 Noise component analysis unit

Claims (3)

A first audio interface which is connected to a speaker output terminal of a radio receiver to be evaluated mounted on a vehicle and receives an audio output and converts it into a digital signal; first clock means for outputting time information; The first audio interface is connected to the first clock means, receives audio data digitally converted from the first audio interface, and stores the data corresponding to the time information output from the first clock means. First audio data acquisition means comprising: a computer;
A second audio interface connected to a speaker output terminal of a reference radio receiver installed in a base having a good reception environment, for receiving an audio output and converting it into a digital signal; and the same time information as the first clock means. A second clock means for outputting, connected to the second audio interface and the second clock means, receiving digitally converted audio data from the second audio interface, and outputting from the second clock means A second audio data acquisition means comprising a second computer for storing the corresponding time information,
A first audio data storage for storing the evaluation target audio data acquired by the first audio data acquiring means; and a second audio for storing the reference audio data acquired by the second audio data acquiring means. The performance of the evaluation target radio receiver by comparing the data storage unit, the evaluation target audio data and the reference audio data by matching the time series based on the time information, and taking the difference of the evaluation target audio data from the reference audio data Audio data analysis means for obtaining
The audio data analysis means includes a target data error analysis unit that obtains an error component by taking a difference between the signals of the evaluation target audio data and the reference audio data. In the target data error analysis unit,

here,
Ei: Relative error of the audio signal of the evaluation target radio with respect to the audio signal of the reference radio
Vref (t): signal level with respect to time of reference signal
Vcar (t): Signal level with respect to time of signal to be evaluated
W (t): Weight function
A radio reception performance evaluation system characterized by calculating how close the audio data to be evaluated is to the reference audio data . The audio data analysis means includes a stereo separation change analysis unit that obtains a difference in separation change in stereo output between the evaluation target audio data and the reference audio data by a mathematical formula, and outputs an evaluation result of the evaluation target radio. In the audio data analysis means,

here,
VL (t): Signal level (volume) in the left channel
VR (t): Signal level (volume) in the right channel
The radio reception performance evaluation system according to claim 1 , wherein the calculation is performed . The audio data analysis means includes a volume change analysis unit that obtains a difference in volume change between the evaluation target audio data and the reference audio data by a mathematical expression, and outputs an evaluation result of the evaluation target radio. In

here,
t _i, t _i-1 : Time data for determining the time interval
The radio reception performance evaluation system according to claim 1, wherein the calculation is performed.

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