JP6793307B2 - Signal analyzers, signal analysis programs, program storage media and signal analysis methods. - Google Patents

Description

The present invention relates to a signal analyzer, a signal analysis program, a program storage medium, and a signal analysis method, and more particularly to a technique for analyzing sound emitted from a speaker.

There is growing interest in the stereoscopic effect of the reproduced sound from audio systems. Generally, in an audio system, a stereoscopic effect close to that of a sound source can be obtained at positions where the distances from the left and right speakers are equal. However, depending on the structure of the listening room, it may be difficult for the listener to enjoy listening to music or the like at such a position.

Therefore, an audio amplifier has been considered that adjusts the position (listening point) at which a stereoscopic effect close to that of a sound source can be obtained by adjusting the delay time of the sound emitted from either the left or right speaker. For example, the sound field correction device described in Patent Document 1 below collects sounds emitted from speakers of a plurality of channels with a microphone and adjusts the delay time of sounds emitted from the speakers of a plurality of channels for listening. Adjust the points.

JP-A-2002-330499

There is a demand among users of audio systems equipped with a sound field correction device that the adjustment range when adjusting the listening point should be reduced. However, it is necessary to change the delay time of the sound emitted from the left or right speaker in a short step size, and the speed of the digital circuit is required to be increased, which makes the design difficult.

Therefore, there is a method called precision distance, in which test pulse sounds are emitted from the left and right speakers, sound is collected at the listener's position, and the user adjusts the placement positions of the left and right speakers based on the loudness of the collected sound. It is considered. However, in the precision distance, it may be difficult for the user to know whether the speaker should be moved in the direction closer to the listener or in the direction away from the listener.

An object of the present invention is to facilitate adjustment of a listening point.

In the present invention, the audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and is emitted from the first speaker and the second speaker. A simultaneous sound collecting unit that acquires a simultaneous sound collecting signal based on sound collection, and the audio amplifier generate the first test sound from the first speaker, and the first test sound generated from the first speaker. The first delay of generating the delayed second test sound from the second speaker and acquiring the first delay sound collection signal based on the collection of the sounds emitted from the first speaker and the second speaker. The second test sound is generated from the second speaker in the sound collecting unit and the audio amplifier, and the first test sound delayed with respect to the second test sound generated from the second speaker is used as the first test sound. A second delayed sound collecting unit that acquires a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker while generating from one speaker, and the level of the simultaneous sound collecting signal. It is characterized by including a comparison unit for comparing the level of the first delayed sound collecting signal and the level of the second delayed sound collecting signal.

In the present invention, the audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and is emitted from the first speaker and the second speaker. A simultaneous sound collecting unit that acquires a simultaneous sound collecting signal based on sound collection, and the audio amplifier generate the first test sound from the first speaker, and the first test sound generated from the first speaker. The second test sound delayed by the first hour is generated from the second speaker, and the first delayed sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker is acquired. The first delay sound collecting unit and the audio amplifier generate the first test sound from the first speaker, and the second test sound is longer than the first time with respect to the first test sound generated from the first speaker. A second delay sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker is acquired while generating the second test sound delayed by the time from the second speaker. It is characterized by including a delayed sound collecting unit and a comparison unit for comparing the level of the simultaneous sound collecting signal, the level of the first delayed sound collecting signal, and the level of the second delayed sound collecting signal.

Desirably, the comparison unit has the highest level of the simultaneous sound collection signal among the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal. When, information is generated to indicate to the user that the positions of the first speaker and the second speaker are appropriate, and the level of the first delayed sound collecting signal or the level of the second delayed sound collecting signal is at the maximum. When there is, information instructing the user in the direction in which the first speaker is moved or the direction in which the second speaker is moved is generated according to the comparison result.

Further, in the signal analysis program read into the arithmetic processing apparatus, the present invention generates the first test sound from the first speaker in the audio amplifier, and at the same time generates the second test sound from the second speaker in the audio amplifier. Simultaneous sound collection processing for acquiring simultaneous sound collection signals based on the collection of sounds emitted from the first speaker and the second speaker, and generating the first test sound from the first speaker in the audio amplifier, the said. The second test sound, which is delayed with respect to the first test sound generated from the first speaker, is generated from the second speaker, and sounds emitted from the first speaker and the second speaker are collected. The first delay sound collection process for acquiring the first delay sound collection signal based on the first delay sound collection process, the second test sound generated from the second speaker in the audio amplifier, and the second test sound generated from the second speaker. A second delay in which the delayed first test sound is generated from the first speaker and a second delay sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker is acquired. The arithmetic processing apparatus is allowed to execute the sound collecting process and the comparison process for comparing the level of the simultaneous sound collecting signal, the level of the first delayed sound collecting signal, and the level of the second delayed sound collecting signal. It is a feature.

Further, the present invention is a program storage medium in which the signal analysis program is stored.

Further, in the present invention, the audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and at the same time, emits the second test sound from the first speaker and the second speaker. A simultaneous sound collection step of acquiring a simultaneous sound collection signal based on the collection of the obtained sound, and the first test sound generated from the first speaker by generating the first test sound from the first speaker in the audio amplifier. The second test sound that is delayed with respect to the above is generated from the second speaker, and the first delayed sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker is acquired. 1 Delayed sound collection step and the first test sound delayed with respect to the second test sound generated from the second speaker by causing the audio amplifier to generate the second test sound from the second speaker. A second delayed sound collecting step for acquiring a second delayed sound collecting signal based on the collection of sounds generated from the first speaker and the sound emitted from the first speaker and the second speaker, and the simultaneous sound collecting signal. It is characterized by including a level, a comparison step of comparing the level of the first delayed sound collection signal, and the level of the second delayed sound collection signal.

Further, the present invention includes a first sound collecting unit that generates a first test sound from a first speaker in an audio amplifier and acquires a first sound collecting signal based on the collection of sounds emitted from the first speaker. A second sound collecting unit that generates a second test sound from the second speaker in the audio amplifier and acquires a second sound collecting signal based on the collection of the sound emitted from the second speaker, and the first sound collecting unit in the audio amplifier. Simultaneous collection based on the collection of sounds emitted from the first speaker and the second speaker by generating the first test sound from the speaker and simultaneously generating the second test sound from the second speaker in the audio amplifier. The first test sound is generated from the first speaker by the simultaneous sound collecting unit that acquires a sound signal and the audio amplifier, and is delayed with respect to the first test sound generated from the first speaker. 2 A first delayed sound collecting unit that generates a test sound from the second speaker and further acquires a first delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and the above. The second test sound is generated from the second speaker in the audio amplifier, and the first test sound delayed with respect to the second test sound generated from the second speaker is generated from the first speaker. Further, a second delayed sound collecting unit that acquires a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, a level of the first sound collecting signal, and the second collection. A comparison unit that compares the total level of the total sound signal levels with the level of the simultaneous sound collection signal, and further compares the level of the first delayed sound collection signal and the level of the second delay sound collection signal. It is characterized by having.

Desirably, when the value obtained by dividing the level of the simultaneous sound collection signal by the total level exceeds a predetermined value, the comparison unit informs the user that the positions of the first speaker and the second speaker are appropriate. When the indicated information is generated and the value obtained by dividing the level of the simultaneous sound collection signal by the total level is equal to or less than a predetermined value, the level of the first delayed sound collection signal and the level of the second delay sound collection signal are obtained. Based on the comparison of, the information instructing the user in the direction in which the first speaker is moved or the direction in which the second speaker is moved is generated.

According to the present invention, the listening point can be easily adjusted.

It is a figure which shows the structure of the speaker position determination system. It is a sequence chart of a signal level measurement process. It is a figure which shows the time waveform of a test pulse signal and a sound collection signal. It is a figure which shows the time waveform of a test pulse signal and a sound collection signal. It is a figure which shows the time waveform of a test pulse signal and a sound collection signal. It is a figure which shows the time waveform of a test pulse signal and a sound collection signal. It is a flowchart of signal analysis processing. It is a flowchart of signal analysis processing. It is a figure which shows the structure of the speaker position determination system which concerns on the modification.

FIG. 1 shows the configuration of the speaker position determination system according to the embodiment of the present invention. The speaker positioning system includes an audio amplifier 10 and a signal analysis device 30. In this system, the signal analysis device 30 controls the audio amplifier 10 by wireless communication to generate a test pulse sound from the left speaker 26 and the right speaker 28. The signal analysis device 30 collects the test pulse sound and determines whether or not the position of each speaker is appropriate when the position of the signal analysis device 30 is used as the listening point.

The audio amplifier 10 includes an amplifier-side radio unit 12, a control unit 14, a pulse signal generation unit 16, a left channel amplifier circuit 18, and a right channel amplifier circuit 20. The left speaker 26 is connected to the output terminal of the left channel amplifier circuit 18, and the right speaker 28 is connected to the output terminal of the right channel amplifier circuit 20.

The audio amplifier 10 operates in either the viewing mode or the speaker positioning mode. The viewing mode is a mode in which the audio signal for viewing is amplified and the left speaker 26 and the right speaker 28 generate a sound corresponding to the audio signal. In this mode, the left audio signal 22 is input to the left channel amplifier circuit 18, and the right audio signal 24 is input to the right channel amplifier circuit 20. The left channel amplifier circuit 18 amplifies the left audio signal 22 and outputs it to the left speaker 26, and the right channel amplifier circuit 20 amplifies the right audio signal 24 and outputs it to the right speaker 28. Each speaker generates sound according to the signal output from each amplifier circuit.

The speaker position determination mode is a mode for executing the speaker position determination method described later. In this mode, the amplifier-side wireless unit 12 performs wireless communication with the signal analysis device 30, receives command information from the signal analysis device 30, and outputs the command information to the control unit 14. The control unit 14 controls the pulse signal generation unit 16 according to the command information, and the pulse signal generation unit 16 outputs a test pulse signal to at least one of the left channel amplifier circuit 18 and the right channel amplifier circuit 20. That is, in the speaker position determination mode, the pulse signal generation unit 16 outputs a test pulse signal to at least one of the left channel amplifier circuit 18 and the right channel amplifier circuit 20 according to each process of the speaker position determination method, and each amplifier circuit. Amplifies the test pulse signal, and each speaker generates a sound corresponding to the test pulse signal. For the test pulse signal, for example, pink noise having a frequency spectrum in which power is inversely proportional to frequency is adopted.

The signal analysis device 30 includes a signal analysis unit 32, an analysis device side radio unit 34, a microphone 36, a memory 38, and a display unit 40. The signal analysis device 30 is composed of, for example, a smartphone. Further, the signal analysis device 30 may be a personal computer or the like to which the microphone 36 is connected. The memory 38 stores a signal analysis program for executing the speaker position determination method. The signal analysis unit 32 includes, for example, a processor as an arithmetic processing unit. When the signal analysis unit 32 executes the signal analysis program, the signal analysis device 30 performs wireless communication with the audio amplifier 10 and controls the audio amplifier 10.

That is, the signal analysis unit 32 outputs command information according to the process of the speaker position determination method to the analysis device side radio unit 34, and the analysis device side radio unit 34 transmits the command information to the audio amplifier 10. The audio amplifier 10 outputs a test pulse signal to at least one of the left speaker 26 and the right speaker 28 according to the command information.

The microphone 36 collects the test pulse sound generated by the left speaker 26 and the right speaker 28, converts the test pulse sound into a sound collecting signal which is an electric signal, and outputs the test pulse sound to the signal analysis unit 32. The signal analysis unit 32 obtains a collected sound level indicating the magnitude of the sound collection signal and stores it in the memory 38. The collected sound level is, for example, the peak level of the sound collection signal.

As will be described later, in the speaker position determination method, the test pulse sound is emitted only from the left speaker 26, the test pulse sound is emitted only from the right speaker 28, and the test pulse sound is simultaneously emitted from the left speaker 26 and the right speaker 28. A test pulse sound is emitted by a plurality of operations such as an operation to be emitted and an operation in which a test pulse sound is emitted from the left speaker 26 and the right speaker 28 at different timings. The signal analysis unit 32 acquires a sound collecting signal for each of the plurality of operations, obtains a collected sound level for each of the plurality of operations, and stores it in the memory 38.

The signal analysis unit 32 generates analysis result information by analyzing a plurality of collected sound levels stored in the memory 38, and displays the information on the display unit 40. If the position of the left speaker 26 or the right speaker 28 is not appropriate, the analysis result information should move the left speaker 26 or the right speaker 28 in either the direction toward the listener (forward) or the direction away from the listener (rear). Show the speaker. When the positions of the left speaker 26 and the right speaker 28 are appropriate, the analysis result information indicates that the positions of the respective speakers are appropriate.

Next, the details of the speaker position determination method will be described. The signal analyzer 30 and the audio amplifier 10 execute the signal level measurement process shown in FIG. That is, the signal analyzer 30 executes steps S1 to S10 in the sequence chart of FIG. 2, and the audio amplifier 10 executes steps SA1 to SA5 in the sequence chart of FIG.

Under the control of the signal analyzer 30 (S1), the audio amplifier 10 outputs the test pulse signal LR0 to the left speaker 26 (SA1). As a result, a test pulse sound is emitted from the left speaker 26.

The signal analyzer 30 collects the test pulse sound emitted from the left speaker 26 by the microphone 36. The signal analysis unit 32 in the signal analysis device 30 obtains the first sound collection level A1 indicating the peak level of the first sound collection signal C1 obtained from the microphone 36 and stores it in the memory 38 (S2).

Under the control of the signal analyzer 30 (S3), the audio amplifier 10 outputs the test pulse signal RL0 to the right speaker 28 (SA2). As a result, a test pulse sound is emitted from the right speaker 28.

The signal analyzer 30 collects the test pulse sound emitted from the right speaker 28 by the microphone 36. The signal analysis unit 32 in the signal analysis device 30 obtains the second sound collection level A2 indicating the peak level of the second sound collection signal C2 obtained from the microphone 36 and stores it in the memory 38 (S4).

FIG. 3A shows an example of the time waveform of the test pulse signal LR0 output from the audio amplifier 10 to the left speaker 26 in step SA1 and output from the audio amplifier 10 to the right speaker 28 in step SA2. .. FIG. 3B shows an example of the time waveform of the first sound collecting signal C1 acquired by the signal analysis unit 32, and FIG. 3C shows the second sound collecting signal acquired by the signal analysis unit 32. An example of the time waveform of C2 is shown. 3B and 3C show an example in which the distance from the left speaker 26 to the microphone 36 is longer than the distance from the right speaker 28 to the microphone 36. That is, the time from when the left speaker 26 generates the test pulse sound until the first sound collection signal C1 is acquired is after the right speaker 28 generates the test pulse sound and the second sound collection signal C2 is acquired. An example is shown in which the time τ is longer than the time to reach. The same applies to FIGS. 4 to 6 shown below.

Under the control of the signal analyzer 30 (S5), the audio amplifier 10 simultaneously outputs the test pulse signals L1 and R1 to the left speaker 26 and the right speaker 28 (SA3). As a result, the test pulse sound is simultaneously emitted from the left speaker 26 and the right speaker 28.

The signal analysis device 30 collects the test pulse sound emitted from the left speaker 26 and the right speaker 28 by the microphone 36. The signal analysis unit 32 in the signal analysis device 30 obtains a third sound collection level indicating the peak level of the third sound collection signal C3 obtained from the microphone 36 and stores it in the memory 38 (S6).

FIG. 4A shows an example of the time waveform of the test pulse signal L1 output from the audio amplifier 10 to the left speaker 26 in step SA3, and the test pulse signal R1 output from the audio amplifier 10 to the right speaker 28. An example of a time waveform is shown. FIG. 4B shows an example of the time waveform of the third sound collecting signal C3 acquired by the signal analysis unit 32. The third sound collection signal C3 includes a left sound collection signal CL3 acquired based on the test pulse sound generated by the left speaker 26 and a right sound collection signal CR3 acquired based on the test pulse sound generated by the right speaker 28. It is a added signal.

Under the control of the signal analyzer 30 (S7), the audio amplifier 10 outputs the test pulse signal L2 to the left speaker 26 (SA4). Further, under the control of the signal analysis device 30 (S7), the audio amplifier 10 outputs a delay test pulse signal R2 to the right speaker 28 with a delay of time d with respect to the test pulse signal L2 (SA4). As a result, the test pulse sound is emitted from the left speaker 26, and the delayed test pulse sound is emitted from the right speaker 28 with a delay of time d.

The signal analyzer 30 collects the test pulse sound emitted from the left speaker 26 and the delayed test pulse sound emitted from the right speaker 28 by the microphone 36. The signal analysis unit 32 in the signal analysis device 30 obtains the fourth sound collection level A4 indicating the peak level of the fourth sound collection signal C4 obtained from the microphone 36 and stores it in the memory 38 (S8).

FIG. 5A shows an example of the time waveform of the test pulse signal L2 output from the audio amplifier 10 to the left speaker 26 in step SA4, and the delay test pulse signal R2 output from the audio amplifier 10 to the right speaker 28. An example of the time waveform of is shown. FIG. 5B shows an example of the time waveform of the fourth sound collecting signal C4 acquired by the signal analyzer 30. The fourth sound collection signal C4 includes a left sound collection signal CL4 acquired based on the test pulse sound generated by the left speaker 26 and a right sound collection signal CR4 acquired based on the delay test pulse sound generated by the right speaker 28. Is the added signal.

Under the control of the signal analyzer 30 (S9), the audio amplifier 10 outputs the test pulse signal R3 to the right speaker 28 (SA5). Further, the delay test pulse signal L3 is output to the left speaker 26 with a time d delay from the test pulse signal R3 (SA5). As a result, the test pulse sound is emitted from the right speaker 28, and the delayed test pulse sound is emitted from the left speaker 26 with a delay of time d.

The signal analyzer 30 collects the test pulse sound emitted from the right speaker 28 and the delayed test pulse sound emitted from the left speaker 26 by the microphone 36. The signal analysis unit 32 obtains the fifth collected sound level A5 indicating the peak level of the fifth sound collecting signal C5 obtained from the microphone 36 and stores it in the memory 38 (S10).

FIG. 6A shows an example of the time waveform of the test pulse signal R3 output from the audio amplifier 10 to the right speaker 28 in step SA5, and the delay test pulse signal L3 output from the audio amplifier 10 to the left speaker 26. An example of the time waveform of is shown. FIG. 6B shows an example of the time waveform of the fifth sound collecting signal C5 acquired by the signal analyzer 30. The fifth sound collecting signal C5 includes a left sound collecting signal CR5 acquired based on the test pulse sound generated by the right speaker 28 and a left sound collecting signal CL5 acquired based on the delayed test pulse sound generated by the left speaker 26. Is the added signal.

In steps SA3 to SA5, it suffices that the relative time relationship defined in each step is established between the test pulse signal emitted from the left speaker 26 and the test pulse signal emitted from the right speaker 28. .. That is, the absolute delay time common to each test pulse signal is arbitrary. For example, in step SA3, the test pulse signal output to the left speaker 26 and the test pulse signal output to the right speaker 28 may be delayed by the same time d. Further, in step SA5, the test pulse signal output to the right speaker 28 may be delayed by a time d, and the test pulse signal output to the left speaker 26 may be delayed by a time 2d.

In this case, in each of steps SA3 to SA5, a test pulse signal delayed by time d is output to the right speaker 28. Further, in step SA3, a test pulse signal delayed by time d is output to the left speaker 26. Then, in step SA4, a test pulse signal without delay is output to the left speaker 26, and in step SA5, a test pulse signal delayed by a time of 2d is output to the left speaker 26.

In the above, the delay time of the delay test pulse signal R2 in step SA4 of FIG. 2 and the delay time of the delay test pulse signal L3 in step SA5 of FIG. 2 are set to be the same time, but these delay times are different. You may.

Further, in the above, the time waveform of the test pulse signal output from the audio amplifier 10 to the left speaker 26 and the time waveform of the test pulse signal output from the audio amplifier 10 to the right speaker 28 are the same. The time waveforms of are different.

Further, preferably, the time waveforms of the test pulse signals output from the audio amplifier 10 to the left speaker 26 are all the same, and the time waveforms of the test pulse signals output from the audio amplifier 10 to the right speaker 28 are all the same. It is assumed that. When the time waveform of the test pulse signal output from the audio amplifier 10 to the left speaker 26 varies, the smaller the variation, the higher the reliability of the measurement. Similarly, when the time waveform of the test pulse signal output from the audio amplifier 10 to the right speaker 28 varies, the smaller the variation, the higher the reliability of the measurement.

Further, instead of the test pulse signal, a continuous sinusoidal signal on the time axis may be used. In this case, the signal analysis unit 32 measures, for example, the peak / peak value of the sine wave, the amplitude value, and the like as the collected sound level.

After the signal level measurement process shown in FIG. 2 is executed, the signal analysis unit 32 executes the signal analysis process shown in the flowchart of FIG. 7. The signal analysis process is a process for obtaining analysis result information using the first collected sound levels A1 to the fifth collected sound levels A5 stored by the signal level measurement process.

The principle of signal analysis processing is as follows. When the distance from the left speaker 26 to the microphone 36 and the distance from the right speaker 28 to the microphone 36 are equal, the third collected sound level under the condition that the test pulse sound is simultaneously emitted from the left speaker 26 and the right speaker 28. A3 is larger than any of the fourth collected sound level A4 and the fifth collected sound level A5. This is because the fourth collected sound level A4 and the fifth collected sound level A5 are levels when the test pulse sounds from the left speaker 26 and the right speaker 28 do not reach the microphone 36 at the same time. Therefore, the signal analysis unit 32 indicates that when the third collected sound level A3 is larger than any of the fourth collected sound level A4 and the fifth collected sound level A5, the position of each speaker is appropriate. To generate.

On the other hand, when the distance from the left speaker 26 to the microphone 36 is longer than the distance from the right speaker 28 to the microphone 36, the test pulse sound from the right speaker 28 is compared with the test pulse sound from the left speaker 26. The collected sound level is higher when the delay is made than when the left-right delay relationship is reversed. However, it is assumed that the above delay time d is appropriately set.

In this case, the fourth collected sound level A4 under the condition that the test pulse sound from the right speaker 28 is delayed with respect to the test pulse sound from the left speaker 26 is the third collected sound level A3 and the fifth collected sound level. It is larger than any of A5. Therefore, when the fourth collected sound level A4 is larger than any of the third collected sound level A3 and the fifth collected sound level A5, the signal analysis unit 32 moves the left speaker 26 forward or moves the right speaker 28 backward. Generates analysis result information that instructs the user to move to.

Based on the same principle, the signal analysis unit 32 moves the right speaker 28 forward when the fifth collected sound level A5 is larger than either the third collected sound level A3 or the fourth collected sound level A4. Generates analysis result information instructing the user to move the left speaker 26 backward.

In the signal analysis process shown in FIG. 7, the third collected sound level A3, the fourth collected sound level A4, and the fifth collected sound level A5 are set to the first collected sound level A1 and the second collected sound level A2, respectively. Although standardized at the reference level, which is the sum of the above, the principle of signal analysis processing is the same as above.

The signal analysis unit 32 adds the first collected sound level A1 and the second collected sound level A2 to obtain the reference level A0 = A1 + A2 (S101). The signal analysis unit 32 obtains a score SC3 = A3 / A0 obtained by dividing the third collected sound level A3 by the reference level A0 (S102). Further, the signal analysis unit 32 obtains the score SC4 = A4 / A0 obtained by dividing the fourth collected sound level A4 by the reference level A0 (S103), and further divides the fifth collected sound level A5 by the reference level A0 to obtain the score SC5. = A5 / A0 is obtained (S104).

The signal analysis unit 32 determines whether or not the score SC3 is the maximum among the scores SC3 to SC5 (S105). When the score SC3 is the maximum, the signal analysis unit 32 outputs analysis result information indicating that the positions of the left speaker 26 and the right speaker 28 are appropriate to the display unit 40 (S106). The display unit 40 displays information indicating that the positions of the speakers are appropriate.

When the score SC3 is not the maximum, the signal analysis unit 32 determines whether or not the score SC4 is the maximum among the scores SC3 to SC5 (S107). When the score SC4 is the maximum, the signal analysis unit 32 outputs analysis result information instructing the user to move the right speaker 28 backward or the left speaker 26 forward (to the display unit 40). S108). The display unit 40 displays information instructing the user to move the right speaker 28 backward or the left speaker 26 forward according to the analysis result information.

When the score SC4 is not the maximum and the score SC5 is the maximum, the signal analysis unit 32 outputs the analysis result information instructing the user to move the right speaker 28 forward or the left speaker 26 backward. Output to the display unit 40 (S109). The display unit 40 displays information instructing the user to move the right speaker 28 forward or the left speaker 26 backward.

In the example shown in FIGS. 3 to 6, the distance from the left speaker 26 to the microphone 36 is longer than the distance from the right speaker 28 to the microphone 36. Therefore, when the test pulse sound from the right speaker 28 is delayed with respect to the test pulse sound from the left speaker 26, the collected sound level becomes larger than when the left and right delay relationships are reversed. That is, the fourth collected sound level A4 acquired under the condition that the test pulse sound from the right speaker 28 is delayed with respect to the test pulse sound from the left speaker 26 is under the condition that the left and right delay relationship is reversed. It becomes larger than the fifth collected sound level A5 acquired in. Therefore, the signal analysis unit 32 outputs to the display unit 40 information instructing the user to move the right speaker 28 to the rear or to move the left speaker 26 to the front. The display unit 40 displays information instructing the user to move the right speaker 28 backward or the left speaker 26 forward.

When the information indicating that the position of each speaker is appropriate is displayed on the display unit 40 by the above signal analysis process, the user may leave the arrangement of the left speaker 26 and the right speaker 28 as they are. .. The position of the microphone 36 in the signal analyzer 30 is an appropriate listening point.

On the other hand, when the information indicating the moving direction of the left speaker 26 or the right speaker 28 is displayed on the display unit 40, the user may change the arrangement position of the left speaker 26 or the right speaker 28 according to the instruction. Then, the speaker position determination system may be made to execute the signal level measurement process shown in FIG. 2 again, and the signal analysis device 30 may be made to execute the signal analysis process shown in FIG.

In the signal analysis device 30 according to the present embodiment, the analysis result information displayed by the display unit 40 instructs the user in the moving direction of the left speaker 26 or the right speaker 28. The user may fix one of the left speaker 26 and the right speaker 28 as a reference speaker. That is, the user may check the moving direction of the other speaker that is not fixedly arranged by the signal analysis device 30, and adjust the position by using the other speaker as the adjustment speaker. Further, depending on the user's setting, the signal analysis unit 32 may display information indicating only the moving direction of the left speaker 26 on the display unit 40, or may display information indicating only the moving direction of the right speaker 28. It may be displayed on the display unit 40.

According to such signal level measurement processing and signal analysis processing, not only the positions of the left and right speakers are not appropriate, but also the direction in which each speaker should be moved is indicated to the user. This facilitates the work of arranging the left and right speakers at appropriate positions and adjusting the listening points.

The process shown in FIG. 7 can be transformed into a process that does not use the first collected sound level A1 and the second collected sound level A2. That is, the third collected sound level A3, the fourth collected sound level A4, and the fifth collected sound level A5 may be used instead of the score SC3, the score SC4, and the SC5, respectively, without executing step S101. In this case, in the signal level measurement process shown in FIG. 2, the signal analyzer 30 does not have to execute steps S1 to S4, and the audio amplifier 10 does not have to execute steps SA1 and SA2.

If the delay time of the delay test pulse signal R2 in step SA4 of FIG. 2 or the delay time of the delay test pulse signal L3 in step SA5 of FIG. 2 is not appropriate, accurate analysis result information may not be obtained. is there. Therefore, the signal analysis unit 32 may use a plurality of types of values as the delay time of the delay test pulse signal R2 and the delay time of the delay test pulse signal L3. In this case, the signal analysis unit 32 executes the signal level measurement process (FIG. 2) and the signal analysis process (FIG. 7 or 8) for each of the plurality of types of delay times, and obtains each of the plurality of types of delay times. The analysis result information obtained may be displayed on the display unit 40. When a plurality of analysis result information shows different results, the user may move the left speaker 26 or the right speaker 28 according to the large number of analysis result information showing the same result, for example. ..

The signal analysis unit 32 may execute the process shown in FIG. 8 instead of the process shown in FIG. 7. The signal analysis unit 32 adds the first collected sound level A1 and the second collected sound level A2 to obtain the reference level A0 = A1 + A2 (S201).

The signal analysis unit 32 obtains the score SC3 = A3 / A0 obtained by dividing the third collected sound level A3 by the reference level A0 (S202), and determines whether or not the score SC3 exceeds a predetermined threshold value TH (S203).

When the score SC3 exceeds a predetermined threshold value, the signal analysis unit 32 outputs analysis result information indicating that the positions of the left speaker 26 and the right speaker 28 are appropriate to the display unit 40 (S204). The display unit 40 displays information indicating that the positions of the speakers are appropriate.

When the score SC3 is equal to or less than a predetermined threshold value, the signal analysis unit 32 compares the fourth collected sound level A4 and the fifth collected sound level A5 (S205).

When the fourth collected sound level A4 is higher than the fifth collected sound level A5, the signal analysis unit 32 instructs the user to move the right speaker 28 backward or the left speaker 26 forward. The result information is output to the display unit 40 (S206). The display unit 40 displays information instructing the user to move the right speaker 28 backward or the left speaker 26 forward according to the analysis result information.

When the fifth collected sound level A5 is equal to or higher than the fourth collected sound level A4, the signal analysis unit 32 instructs the user to move the right speaker 28 forward or the left speaker 26 backward. The result information is output to the display unit 40 (S207). The display unit 40 displays information instructing the user to move the right speaker 28 forward or the left speaker 26 backward.

In this way, the signal analysis unit 32 generates a test pulse sound (first test sound) from the left speaker 26 (first speaker) in the audio amplifier 10, and the first is based on the collection of the sound emitted from the left speaker 26. A test pulse sound (second test sound) is generated from the right speaker 28 (second speaker) in the audio amplifier 10 of the first sound collecting unit that acquires the sound collecting signal C1 to collect the sound emitted from the right speaker 28. The second sound collecting unit for acquiring the second sound collecting signal C2 based on the sound, the audio amplifier 10 generates the first test sound from the left speaker 26, and at the same time, the audio amplifier 10 generates the second test sound from the right speaker 28, and the left Simultaneous sound collecting unit that acquires the third sound collecting signal C3 (simultaneous sound collecting signal) based on the collection of sounds emitted from the speaker 26 and the right speaker 28, the audio amplifier 10 generates the first test sound from the left speaker 26. , The second test sound delayed with respect to the first test sound generated from the left speaker 26 is generated from the right speaker 28, and further, the second test sound based on the sound collection of the sounds emitted from the left speaker 26 and the right speaker 28. 4 The second test sound generated from the right speaker 28 by generating the second test sound from the right speaker 28 in the first delay sound collecting unit for acquiring the sound collecting signal C4 (first delayed sound collecting signal) and the audio amplifier 10 The first test sound delayed with respect to the sound is generated from the left speaker 26, and the fifth sound collection signal C5 (second delay collection) based on the sound collection of the sounds emitted from the left speaker 26 and the right speaker 28. It has a function as a second delay sound collecting unit for acquiring (sound signal). The time waveform of the first test sound emitted from the left speaker 26 and the time waveform of the second test sound emitted from the right speaker 28 may be the same or different.

Further, the signal analysis unit 32 that executes the process shown in FIG. 7 serves as a comparison unit that compares the level of the third sound collection signal C3, the level of the fourth sound collection signal C4, and the level of the fifth sound collection signal C5. It has the function of. Then, the signal analysis unit 32 that executes the process shown in FIG. 8 sets the total level of the first sound collection signal C1 and the level of the second sound collection signal C2 and the level of the third sound collection signal C3. It has a function as a comparison unit for comparing and further comparing the level of the fourth sound collecting signal C4 and the level of the fifth sound collecting signal C5.

In the first sound collecting unit, the second sound collecting unit, the simultaneous sound collecting unit, the first delayed sound collecting unit, the second delayed sound collecting unit, and the comparison unit, the signal analysis unit 32 transmits the signal analysis program stored in the memory 38. By executing this, it is realized in the signal analysis unit 32. Further, some or all of the components realized in the signal analysis unit 32 may be individually configured by a digital circuit which is hardware. Further, the memory 38 may be a detachable storage medium such as an optical disk, a magnetic disk, or an IC, and the signal analysis program may be stored in this storage medium.

The signal level measurement process step SA5 shown in FIG. 2 may be the following process. That is, after the audio amplifier 10 outputs the test pulse signal L2 to the left speaker 26 under the control of the signal analysis device 30, the audio amplifier 10 controls the test pulse signal L2 for the above time under the control of the signal analysis device 30. The process may be a process of outputting a delay test pulse signal to the right speaker 28 with a delay of d2 for a time longer than d. As a result, the test pulse sound is emitted from the left speaker 26, and the delayed test pulse sound is emitted from the right speaker 28 with a delay of d2 longer than the time d.

In this case, in step S109 of FIG. 7 and step S207 of FIG. 8, information instructing the user that the right speaker 28 should be moved backward or the left speaker 26 should be moved forward is sent to the display unit 40. Is displayed. Further, in step 108 of FIG. 7, it may be displayed on the display unit 40 that the distance for moving the speaker is small, and in step S109, the distance for moving the speaker is large. Similarly, in step 206 of FIG. 8, it may be displayed on the display unit 40 that the distance for moving the speaker is small, and in step S207, the distance for moving the speaker is large. Further, the distance to move the speaker may be displayed on the display unit 40.

In this process, the signal analysis unit 32 generates the first test sound from the left speaker 26 in the audio amplifier 10, and acquires the first sound collection signal C1 based on the collection of the sound emitted from the left speaker 26. The sound unit and the audio amplifier 10 generate the second test sound from the right speaker 28 and acquire the second sound collection signal C2 based on the collection of the sound emitted from the right speaker 28. A first test sound is generated from the left speaker 26 in the audio amplifier 10, and a second test sound is generated from the right speaker 28 in the audio amplifier 10 at the same time. 3 The first test sound is generated from the left speaker 26 in the audio amplifier 10, which is the simultaneous sound collecting unit that acquires the sound collecting signal C3 (simultaneous sound collecting signal), and the first test sound is generated from the left speaker 26. The second test sound delayed by time d is generated from the right speaker 28, and the fourth sound collection signal C4 (first delayed sound collection) based on the sound collection of the sounds emitted from the left speaker 26 and the right speaker 28 is further generated. The first delay sound collecting unit for acquiring the signal) and the audio amplifier 10 generate the first test sound from the left speaker 26, and the first test sound generated from the left speaker 26 is longer than the first time d. The second test sound delayed by d2 for 2 hours is generated from the right speaker 28, and the fifth sound collection signal C5 (second delay collection) based on the sound collection of the sounds emitted from the left speaker 26 and the right speaker 28. It has a function as a second delay sound collecting unit for acquiring (sound signal).

FIG. 9 shows the configuration of the speaker position determination system according to the modified example. The same components as those of the speaker positioning system in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In the audio amplifier 42 in this system, the signal analysis device 30 in the system of FIG. 1 is mounted on the audio amplifier 10, the control unit 14 and the signal analysis unit 32 are connected by wire, and the microphone 36 is connected to the outside of the audio amplifier 42. It is provided. The microphone 36 is detachable from the audio amplifier 42 via a cable.

The signal analysis device 44 includes a signal analysis unit 32, a memory 38, and a display unit 40, and is mounted on the audio amplifier 42. When the signal analysis unit 32 executes the signal analysis program stored in the memory 38, the signal analysis unit 32 outputs command information according to the process of the speaker position determination method to the control unit 14.

In any of the above embodiments, the signal analysis unit 32 may be connected to an external computer via a communication network such as a local area network or the Internet. In this case, the signal analysis unit 32 may have an external computer execute a part of the commands of the signal analysis program. Further, the signal analysis unit 32 may store information necessary for executing the signal analysis program and information obtained by executing the signal analysis program in an external computer in addition to the memory 38.

In the above embodiment, the audio system having the two-channel speaker of the left speaker 26 and the right speaker 28 has been described. The present invention may be used in a surround system or the like having a plurality of speakers having three or more channels. In this case, for two speakers selected from the plurality of speakers, the signal analyzer (30,44) is made to determine whether or not the positions of the two speakers are appropriate. The user may repeat the process of determining and correcting the position for each combination of all combinations that select two from the plurality of speakers.

10,42 Audio amplifier, 12 Amplifier side radio unit, 14 Control unit, 16 pulse signal generator, 18 Left channel amplifier circuit, 20 Right channel amplifier circuit, 22 Left audio signal, 24 Right audio signal, 26 Left speaker, 28 Right Speaker, 30,44 signal analyzer, 32 signal analyzer, 34 analyzer side radio, 36 microphone, 38 memory, 40 display.

Claims (8)

The audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and at the same time, collects the sounds emitted from the first speaker and the second speaker. Simultaneous sound collection unit that acquires the simultaneous sound collection signal based on
The audio amplifier generates the first test sound from the first speaker, and generates the second test sound delayed from the first test sound generated from the first speaker from the second speaker. At the same time, a first delay sound collecting unit that acquires a first delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and
The audio amplifier generates the second test sound from the second speaker, and generates the first test sound delayed from the second test sound generated from the second speaker from the first speaker. At the same time, a second delayed sound collecting unit that acquires a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and
A comparison unit that compares the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal.
A signal analysis device comprising. The audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and at the same time, collects the sounds emitted from the first speaker and the second speaker. Simultaneous sound collection unit that acquires the simultaneous sound collection signal based on
The first test sound is generated from the first speaker in the audio amplifier, and the second test sound delayed by the first hour from the first test sound generated from the first speaker is generated by the second test sound. A first delayed sound collecting unit that acquires a first delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker while generating from the speaker.
The second test sound is generated from the first speaker in the audio amplifier, and is delayed by a second time longer than the first time with respect to the first test sound generated from the first speaker. A second delayed sound collecting unit that generates a test sound from the second speaker and acquires a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker.
A comparison unit that compares the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal.
A signal analysis device comprising. In the signal analyzer according to claim 1 or 2.
The comparison unit
When the level of the simultaneous sound collection signal is the maximum among the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal, the first speaker and When the information indicating to the user that the position of the second speaker is appropriate is generated and the level of the first delayed sound collecting signal or the level of the second delayed sound collecting signal is the maximum, the first speaker Information indicating the direction in which the second speaker is moved or the direction in which the second speaker is moved is generated according to the comparison result.
A signal analyzer characterized by this. In the signal analysis program read into the arithmetic processing unit
The audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and at the same time, collects the sounds emitted from the first speaker and the second speaker. Simultaneous sound collection processing to acquire the simultaneous sound collection signal based on
The audio amplifier generates the first test sound from the first speaker, and generates the second test sound delayed from the first test sound generated from the first speaker from the second speaker. At the same time, a first delay sound collection process for acquiring a first delay sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker, and
The audio amplifier generates the second test sound from the second speaker, and generates the first test sound delayed from the second test sound generated from the second speaker from the first speaker. At the same time, a second delay sound collection process for acquiring a second delay sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker, and
A comparison process for comparing the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal, and
A signal analysis program, characterized in that the arithmetic processing unit is executed. A program storage medium in which the signal analysis program according to claim 4 is stored. The audio amplifier generates the first test sound from the first speaker, and at the same time, the audio amplifier generates the second test sound from the second speaker, and at the same time, collects the sounds emitted from the first speaker and the second speaker. Simultaneous sound collection step to acquire the simultaneous sound collection signal based on, and
The audio amplifier generates the first test sound from the first speaker, and generates the second test sound delayed from the first test sound generated from the first speaker from the second speaker. At the same time, a first delay sound collection step for acquiring a first delay sound collection signal based on the collection of sounds emitted from the first speaker and the second speaker, and
The audio amplifier generates the second test sound from the second speaker, and generates the first test sound delayed from the second test sound generated from the second speaker from the first speaker. At the same time, a second delayed sound collecting step for acquiring a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and
A comparison step of comparing the level of the simultaneous sound collection signal, the level of the first delay sound collection signal, and the level of the second delay sound collection signal, and
A signal analysis method comprising. The first sound collecting unit that generates the first test sound from the first speaker in the audio amplifier and acquires the first sound collecting signal based on the collection of the sound emitted from the first speaker, and the audio amplifier from the second speaker. A second sound collecting unit that generates a second test sound and acquires a second sound collecting signal based on the collection of sounds emitted from the second speaker.
The audio amplifier was made to generate the first test sound from the first speaker, and at the same time, the audio amplifier was made to generate the second test sound from the second speaker, which was emitted from the first speaker and the second speaker. A simultaneous sound collector that acquires a simultaneous sound collection signal based on sound collection,
The first test sound is generated from the first speaker in the audio amplifier, and the second test sound delayed with respect to the first test sound generated from the first speaker is generated from the second speaker. Further, a first delayed sound collecting unit that acquires a first delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and
The second test sound is generated from the second speaker in the audio amplifier, and the first test sound delayed with respect to the second test sound generated from the second speaker is generated from the first speaker. Further, a second delayed sound collecting unit that acquires a second delayed sound collecting signal based on the collection of sounds emitted from the first speaker and the second speaker, and
The total level of the first sound collection signal and the level of the second sound collection signal is compared with the level of the simultaneous sound collection signal, and further, the level of the first delay sound collection signal and the second sound collection signal are compared. A comparison unit that compares the levels of delayed sound collection signals,
A signal analysis device comprising. In the signal analyzer according to claim 7,
The comparison unit
When the value obtained by dividing the level of the simultaneous sound collection signal by the total level exceeds a predetermined value, information indicating to the user that the positions of the first speaker and the second speaker are appropriate is generated, and the simultaneous When the value obtained by dividing the level of the sound collecting signal by the total level is equal to or less than a predetermined value, the first delay sound collecting signal level is compared with the second delayed sound collecting signal level. Generates information instructing the user in the direction in which one speaker is moved or in the direction in which the second speaker is moved.
A signal analyzer characterized by this.

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