JP3900676B2 - Audio device listening position automatic setting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a listening position setting device for performing optimum setting at a listening position in an audio apparatus having a plurality of speakers.
[0002]
[Prior art]
Conventionally, in an audio apparatus having a plurality of speakers, if the distance from each speaker to the listening position is different, the volume and time axis from each speaker at the listening position will be different.
For this reason, an adjustment unit, a so-called processing unit, is incorporated in the audio device, thereby adjusting the time axis and volume of the audio signal for each speaker.
[0003]
Here, the above adjustment is actually performed by the user operating the processing unit with the remote control device, inputting the numerical value of the listening position with the remote control device, and then listening to the sound actually coming out of the speaker. By changing the position to the front, rear, left and right, the processing unit adjusts the time axis and volume of each speaker. When the user hears the sound from each speaker and determines that it is the best, the adjustment is completed.
[0004]
[Problems to be solved by the invention]
By the way, in an audio apparatus incorporating such a processing unit, every time the audio apparatus is used, the user needs to perform the above-described adjustment based on the listening position, and the operation is troublesome. There is a problem that it is difficult to perform accurate adjustment.
[0005]
In view of the above, an object of the present invention is to provide an audio device listening position automatic setting device that automatically and quickly adjusts the time axis and volume of each speaker.
[0006]
[Means for Solving the Problems]
The automatic listening position setting device of the audio device according to the present invention is incorporated in an audio device to which a plurality of speakers are connected, and adjusts the time axis and volume of an audio signal for each speaker and outputs an ultrasonic signal for measurement. An adjusting unit that generates and supplies a test sound signal to each of the speakers, and a test sound that is disposed near the listening position and that is sequentially emitted from each speaker and the ultrasonic wave a measurement unit for converting each electric signal by receiving ultrasonic waves from the speaker, an electrical signal from the measuring unit includes a transmission unit to be transmitted to the adjustment unit, this adjustment unit, the transmission unit based on the electric signal transmitted from the measurement unit (the listening position from the ultrasonic speaker from the phase difference between the drive signal and the received signal of the measuring unit to the ultrasonic speaker The distance from each speaker to this measurement unit is calculated by calculating the distance between each speaker and the sound pressure difference for the test sound of each speaker, and the listening position is obtained and corresponding to this listening position. The audio device is controlled.
[0007]
According to the above configuration, the adjustment unit controls the ultrasonic speaker to generate an ultrasonic signal for measurement, and also controls the audio device to sequentially generate a test sound from each speaker.
As a result, the measurement unit receives the ultrasonic signal and the test sound from each of the ultrasonic speaker and each speaker of the audio device, converts it into an electrical signal, and transmits the received signal to the adjustment unit by the transmission unit.
The adjustment unit receives the signal from the transmission unit, compares the reception signal of the ultrasonic signal and the drive signal of the ultrasonic speaker, and based on the phase delay, the measurement unit and the ultrasonic speaker, that is, the adjustment unit And the distance between the listening position and the listening position. Further, the adjustment unit compares the reception signal from each speaker and the drive signal of each speaker, and calculates the distance ratio from each speaker to the listening position based on the sound pressure difference.
[0008]
Thereby, the adjustment unit obtains the listening position based on the distance from the measurement unit to the listening position and the distance ratio from each speaker to the listening position, and performs the time axis adjustment and level adjustment for each speaker. The listening position is adjusted so that the sound balance from the speakers at the listening position is optimal.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.
[0010]
FIG. 1 shows a schematic configuration of an audio apparatus including an embodiment of an automatic listening position setting apparatus according to the present invention.
In FIG. 1, an audio device 10 is a normal audio device for home use, for example, a reproduction unit 11 for generating a reproduction signal, a preamplifier function for performing acoustic adjustment on the reproduction signal from the reproduction unit 11, and a listening position. A processing unit 12 as an adjustment unit having an adjustment function, a power amplifier 13 that amplifies a reproduction signal adjusted by the processing unit 12, and a plurality of speakers that respectively convert the reproduction signal amplified by the power amplifier 13 into sound. A remote control device 14 including an ultrasonic microphone and a voice microphone as a measurement unit, and an ultrasonic speaker 15 disposed in the vicinity of the processing unit 12.
[0011]
The reproducing unit 11 is, for example, a cassette tape deck, a compact disc (CD) player, a mini disc (MD) deck, an FM-AM tuner, or the like, and reproduces each medium or receives radio waves. As is well known, a reproduction signal is obtained.
[0012]
FIG. 2 is a block diagram showing an electrical configuration of the processing unit 12. The processing unit 12 performs various controls based on, for example, a digital preamplifier 12a by a DSP (digital signal processor), an electric signal from the receiver 12b that receives an infrared signal from the remote control device 14, and an electric signal from the receiver 12b. A control unit 12c that performs calculation described later, and an adjustment circuit 12d that adjusts the listening position based on the calculation result of the control unit 12c are provided.
[0013]
The digital preamplifier 12a is configured to perform various acoustic adjustments such as equalization, for example, on each reproduction signal constituting a set of reproduction signals from the reproduction unit 11.
The receiving unit 12b receives the infrared signal from the remote control device 14, converts it into an electrical signal, and sends it to the control unit 12c.
The control unit 12c performs various operations on the preamplifier 12a based on the electrical signal from the reception unit 12b, and adjusts the listening position based on the signal from the remote control device 14 when adjusting the listening position. Is controlled.
The adjustment circuit 12d performs time axis adjustment and volume adjustment on the reproduction signal whose sound quality has been adjusted by the preamplifier 12a under the control of the control unit 12c.
[0014]
The control unit 12c drives and controls the ultrasonic speaker 15 to adjust the listening position and generates an ultrasonic signal for measurement, and drives and controls the preamplifier 12a. Thus, test sounds are sequentially generated from the speakers 21L, 21R, 22L, and 22R.
The power amplifier 13 is configured to amplify the reproduction signals.
[0015]
For example, as shown in FIG. 1, the speaker system 20 includes speakers 21L, 21R, 22L, and 22R at a plurality of symmetrical locations in the room, and in the illustrated case, the front and rear left and right.
[0016]
The remote control device 14 is a remote control device for a normal audio device. For example, the remote control device 14 transmits an infrared signal to the receiving unit 12b provided in the processing unit 12, and various types of audio devices 10 are transmitted via the processing unit 12. Perform the operation.
Further, the remote control device 14 receives an ultrasonic signal for measurement emitted from the ultrasonic speaker 15 by the ultrasonic microphone 14a, converts it into an electrical signal, transmits it to the processing unit 12, and transmits it to the processing unit 12 by using the audio microphone 14b. When the listening position is adjusted, test sounds emitted from the speakers 21L, 21R, 22L, and 22R of the speaker system 20 are received, converted into electrical signals, and transmitted to the processing unit 12.
[0017]
In this case, the remote control device 14 is configured to transmit the electrical signals from the ultrasonic microphone 14a and the voice microphone 14b as infrared signals using an infrared transmission unit for performing various operations of the audio device 10. ing.
The ultrasonic speaker 15 is controlled by the processing unit 12 and is configured to generate an ultrasonic signal for measurement when the listening position is adjusted.
[0018]
Here, the processing unit 12 compares the received signal of the ultrasonic signal from the ultrasonic speaker 15 with the drive signal of the ultrasonic speaker 15 based on the infrared signal from the remote control device 14 when adjusting the listening position. Thus, the phase difference is detected, and the distance from the ultrasonic speaker 15 to the remote control device 14, that is, the distance from the processing unit 12 to the listening position is calculated from the phase difference.
In addition, the processing unit 12 performs test sounds from the speakers 21L, 21R, 22L, and 22R on the received signals of the test sounds from the speakers 21L, 21R, 22L, and 22R based on the infrared signal from the remote control device 14. Is detected, and the distance ratio from each speaker 21L, 21R, 22L, 22R to the remote control device 14, that is, the distance ratio from each speaker to the listening position is calculated from this sound pressure difference.
[0019]
Thereby, the processing unit 12 obtains the listening position from the distance from the ultrasonic speaker 15 and the distance ratio from each speaker 21L, 21R, 22L, 22R, and the optimum sound balance with respect to the listening position, that is, each speaker 21L. , 21R, 22L, 22R so that the phase difference between the reproduced sounds is zero and the sound pressures of the reproduced sounds from the speakers 21L, 21R, 22L, 22R are equal. The time axis adjustment and volume adjustment of the reproduction signal with respect to are performed.
[0020]
The audio apparatus 10 according to the present embodiment is configured as described above, and operates in the following manner according to the flowchart shown in FIG. 3 in the case of listening position adjustment. First, in step ST1, the user switches the processing unit 12 to the listening position adjustment mode by operating the processing unit 12 using the remote control device 14.
[0021]
In step ST2, in the processing unit 12, the control unit 12c drives and controls the ultrasonic speaker 15 to generate an ultrasonic signal for measurement.
As a result, the ultrasonic signal from the ultrasonic speaker 15 is collected by the ultrasonic microphone 14a of the remote control device 14 and converted into an electrical signal, which is transmitted as an infrared signal from a transmission unit (not shown) of the remote control device 14 for processing. The signal is received by the receiving unit 12b of the unit 12 and input to the control unit 12c.
[0022]
Next, in step ST3, in the processing unit 12, the control unit 12c drives and controls the preamplifier 12a to sequentially generate test sounds for the speakers 21L, 21R, 22L, and 22R.
Thus, test sounds from the speakers 21L, 21R, 22L, and 22R are collected by the audio microphone 14b of the remote control device 14 and converted into electric signals, respectively, and are transmitted as infrared signals from a transmission unit (not shown) of the remote control device 14. It is transmitted, received by the receiving unit 12b of the processing unit 12, and input to the control unit 12c.
In this case, the test sound is sequentially generated from each speaker, so that each test sound is reliably and independently collected by the voice microphone 14b for each speaker.
[0023]
Thus, in step ST4, the control unit 12c compares the ultrasonic signal with the drive signal of the ultrasonic speaker 15 based on the signal from the remote control device 14, and thereby calculates the ultrasonic speaker from the phase difference. The distance from 15 to the remote control device 14, that is, the vicinity of the listening position is calculated. This distance specifies the radial position of the remote control device 14 around the ultrasonic speaker 15 in FIG.
Further, the control unit 12c determines the test sound from each speaker based on the signal from the remote control device 14 from the mutual sound pressure difference from each speaker 21L, 21R, 22L, 22R from the remote control device 14, that is, near the listening position. The distance ratio is calculated. According to this distance ratio, when the speakers 21L and 21R are shown in FIG. 4, the position corresponding to the distance ratio on the circumference indicating the radial position indicates the listening position.
Thus, based on the distance ratio from each of the speakers 21L to 22R and the distance from the ultrasonic speaker 15, the control unit 12c obtains the listening position.
[0024]
Finally, in step ST5, the control unit 12c corresponds to the distance from each speaker 21L, 21R, 22L, 22R to the listening position of the reproduction signal output to each speaker 21L, 21R, 22L, 22R. Adjust the time axis. As a result, the reproduced sound from each of the speakers 21L, 21R, 22L, and 22R reaches the listening position simultaneously with the same phase.
Further, the control unit 12c determines the reproduction signal output to each speaker 21L, 21R, 22L, 22R based on the distance from each speaker 21L, 21R, 22L, 22R to the listening position and the sound pressure difference between the test sounds. Adjust the volume. Thereby, the reproduced sound from each speaker 21L, 21R, 22L, 22R becomes the same volume at the listening position.
This completes the setting of the listening position by the automatic listening position adjustment apparatus.
[0025]
In the audio device 10 set as the listening position in this way, each reproduction signal from the reproduction unit 11 is acoustically adjusted by the preamplifier 12a of the listening position automatic adjusting device 12, and then amplified by the power amplifier 13 to be output to each speaker. By being input to 21L to 22R, reproduction sound is generated by generating reproduced sound from each speaker 21L to 22R, and the reproduced sound from each speaker 21L to 22R has the same phase and the same at the listening position. It will be heard at the volume.
[0026]
Therefore, according to the above-described embodiment, the reproduced sound from each speaker reaches the listening position at the same time, and the volume of the reproduced sound from each speaker at the listening position becomes equal. If the speaker is at the middle position of each speaker, the same reproduced sound is heard, and it is possible to appreciate the realistic reproduced sound.
[0027]
The upper Symbol ultrasonic speaker, when the omnidirectional in the horizontal direction with respect electric signal to the ultrasonic signal from the measuring unit, is necessary in view of the horizontal directivity, to calculate the distance Since there is no distance, the distance is easily calculated.
[0028]
In addition, when the measurement unit and the transmission unit are incorporated in a remote control device for performing various operations of the audio device and / or the measurement unit, the user usually has a hand when using the audio device. Incorporating the above-mentioned measuring unit and transmitting unit into the remote control device placed in the position makes it possible to arrange the measuring unit and transmitting unit separately from the remote control device. It is easy to handle.
[0029]
When the transmission unit uses a transmission unit of a remote control device, for example, an infrared transmission unit, the transmission unit of the listening position automatic setting device is omitted by sharing the transmission unit of the remote control device. As a result, the configuration is simplified and the cost is reduced.
[0030]
In the embodiment described above, the speaker system 20 is configured to include the four speakers 21L to 22R. However, the present invention is not limited to this, and the speaker system 20 includes a plurality of speakers arranged symmetrically. However, the present invention can be applied even when the position is not symmetrical with respect to the low-frequency speaker.
[0031]
In the above-described embodiment, transmission from the remote control device 14 to the receiving unit 12b of the processing unit 12 is performed via an infrared signal. However, the present invention is not limited to this, and other formats such as radio waves are used. It is clear that the transmission may be
[0032]
Furthermore, in the above-described embodiment, the ultrasonic speaker 15 is disposed in the vicinity of the processing unit 12. However, the present invention is not limited thereto, and for example, the ultrasonic speaker 15 is incorporated in the front panel of the processing unit 12. May be.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a listening position automatic setting device for an audio device in which time axis adjustment and volume adjustment for each speaker are automatically and accurately performed.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing the overall configuration of an audio device incorporating an embodiment of a listening position automatic setting device according to the present invention.
2 is a schematic block diagram illustrating a configuration example of a processing unit in the listening position automatic setting device of FIG. 1;
FIG. 3 is a flowchart showing an operation of the listening position automatic setting device of FIG. 1;
4 is an explanatory diagram showing the principle of distance calculation in the listening position automatic setting device of FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Audio apparatus, 11 ... Playback part, 12 ... Processing unit (adjustment part), 12a ... Preamplifier, 12b ... Reception part, 12c ... Control part, 12d ... Adjustment Circuit, 13 ... Power amplifier, 14 ... Remote control device, 15 ... Ultrasonic speaker, 20 ... Speaker system, 21L, 21R, 22L, 22R ... Speaker.

Claims (5)

Built in an audio device to which a plurality of speakers are connected, adjusts the time axis and volume of the audio signal for each speaker, generates an ultrasonic signal for measurement, supplies it to the ultrasonic speaker, and tests An adjustment unit that generates a sound signal and supplies the sound signal to each speaker;
Disposed in the vicinity of the listening position, a measuring unit for converting the respective electrical signal receiving ultrasonic waves from sequentially test tone and the ultrasonic speaker emitted from each speaker,
A transmission unit that transmits an electrical signal from the measurement unit to the adjustment unit,
Based on the electrical signal transmitted from the transmission unit, the adjustment unit determines the measurement unit (listening position) from the ultrasonic speaker based on the phase difference between the drive signal to the ultrasonic speaker and the reception signal of the measurement unit. And calculating the distance ratio from each speaker to the measurement unit, obtaining the listening position, and corresponding to this listening position. An audio device listening position automatic setting device characterized in that the audio device is controlled .   2. The audio apparatus listening position automatic setting device according to claim 1, wherein the ultrasonic speaker is omnidirectional in the horizontal direction.   The apparatus for automatically setting a listening position of an audio device according to claim 1, wherein the measurement unit and the transmission unit are incorporated in a remote control device for performing various operations of the audio device and / or the measurement unit.   4. The audio device listening position automatic setting device according to claim 3, wherein the transmission unit uses a transmission unit of a remote control device.   2. The audio device listening position automatic setting device according to claim 1, wherein the transmission unit is an infrared transmission unit that transmits an infrared signal.

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