JP2001136600A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sound characteristics by an optimum virtual loudspeaker, according to the position of a user. SOLUTION: A user's position detection part 110 detects distance between a human body sensor 30 and a person (user), according to the level of the detection signal from the human body sensor 30 and outputs the distance data to an angle calculation part 120. The angle calculation part 120 calculates the angle of spread between two loudspeakers 50A and 50B with respect to the position of the person, according to the distance data from the user's position detection part 110 and the interval between the two loudspeakers 50A and 50B which is stored previously. An arithmetic part 130 applies arithmetic processing to an input audio signal according to the angle calculated by the angle calculation part 120 to generate an audio signal representing a virtual loudspeaker having a full sense of spread and output it to the two loudspeakers 50A and 50B. Consequently, when the position of the user to a display device is changed, an optimum virtual loudspeaker can be set corresponding to the changed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having stereo speakers.

[0002]

2. Description of the Related Art In recent years, a flat panel display device such as a liquid crystal display device has attracted attention as a display device replacing a CRT (Cathode Ray Tube). By the way, in AV equipment such as a TV receiver using such a display device, since the sound of TV broadcasts is converted to stereo or connected to a video equipment or the like, it is becoming more and more multifunctional year by year. For example, in the configuration of audio processing, for example, a configuration in which an audio signal is stereo-output from two speakers on the left and right sides is generally used.

In such AV equipment, with the advancement of signal processing technology and cost reduction, an input audio signal is not output from a real speaker as it is, but a virtual audio signal is installed at a different position. There is provided a device that can be processed so as to be heard by a user as if it is being output from a speaker and can be output from an actual speaker. That is, for example, as shown in FIG. 5, the audio signals output from the two left and right real speakers 6A and 6B installed on the stand unit 4 of the display device 2 are converted into virtual speakers 8A and 8B arranged as shown in FIG. DSP (Digital Sign) so that the user can hear the output
The signal is processed by a processing circuit such as an al processor) and output from the real speakers 6A and 6B.

[0004] Such a virtual speaker processing method is disclosed in, for example, JP-A-11-88994.
This is performed by combining many data conversion processes and filter processes.

[0005]

However, in the display device having the processing function of the above-mentioned conventional virtual speaker, the position of the virtual speaker is fixed.
As shown in FIG. 6, if the position of the user is 1A, a sound with an optimal spaciousness is obtained, but the position of the user is 1B.
, It is not possible to obtain a sound with an optimal spaciousness. In other words, in the above-described conventional apparatus, a person has to move to an optimal position in order to listen to a sound having an optimal spaciousness.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device which can obtain an optimum acoustic characteristic by a virtual speaker according to a position of a user.

[0007]

In order to achieve the above object, the present invention provides a display device having a display screen and at least two speakers, a human body sensor for detecting a person in front of the display screen, and a human body sensor. Based on a detection signal from a human body sensor and a user position detecting unit that detects a distance between the person, a detection result from the user position detecting unit, and a position of the two speakers, An angle calculator for calculating a spread angle of the two speakers with respect to the position of the person, and a calculator for calculating an input audio signal based on the angle calculated by the angle calculator and outputting the processed signal to the two speakers. It is characterized by the following.

In the display device of the present invention, the human body sensor detects a person in front of the display screen, and outputs a detection signal to a user position detection unit. The user position detection unit detects a distance between the human body sensor and the person based on a detection signal from the human body sensor, and outputs a result of the detection to the angle calculation unit. The angle calculation unit calculates the spread angle of the two speakers with respect to the position of the person based on the detection result from the user position detection unit and the positions of the two speakers stored in advance. In other words, if the person is close,
It is calculated that the spread angle of the two speakers is large, and that if the position of the person is far, the spread angle of the two speakers is small.

[0009] Based on the angle calculated by the angle calculation unit, the calculation unit processes the input audio signal, and outputs an audio signal representing a virtual speaker having a sufficient feeling of spread to the two speakers. With such a simple configuration, it is possible to set the virtual speaker at an optimum position according to the position of the user, and it is possible to provide acoustic characteristics with a sense of realism.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a display device according to the present invention will be described below. FIG. 1 is a front view showing a configuration of a peripheral portion of a display screen in the display device of the present embodiment, and FIG. 2 is a block diagram showing a configuration of an audio signal processing circuit of the display device shown in FIG. This embodiment is an example in which the present invention is applied to a flat panel display device using a backlight type liquid crystal display or the like.

As shown in FIG. 1, this flat panel display device has a flat panel portion 10 having a rectangular flat shape.
And a human body sensor 30 is provided on the upper right side of the flat panel section 10. The human body sensor 30 detects a human body existing in front of the display screen 20, and uses, for example, infrared rays. The human body sensor 30 outputs a larger detection signal as the position of the person is closer, and can obtain a detection signal corresponding to the distance from the flat panel unit 10 to the person.

In the flat panel display device of the present embodiment, the flat panel unit 10 is
Supported by 0. The stand section 40 includes a base section 40A installed on a desk surface on which the flat panel display device is installed, and a base section 40A.
And an arm portion 40B which is erected on the upper portion of the flat portion. The flat panel portion 10 is joined to the tip of the arm portion 40B. And, in the base portion 40B of the stand portion 40,
Two left and right speakers (real speakers) 50A and 50B are provided. Therefore, in the flat panel display device of the present example, while displaying an image such as a moving image on the display screen 20, the two speakers 50A and 50B perform a stereo output of a sound or a musical sound signal to view various TV broadcasts and videos. Is what you can do.

Further, in the flat panel display device of the present embodiment, it is possible to obtain a sound output by the virtual speakers from the two speakers 50A and 50B using the detection signal from the human body sensor 30. As shown in FIG. 2, the audio signal processing circuit includes a user position detecting unit 110, an angle calculating unit 120, and a calculating unit 130. In the user position detection unit 110, the human body sensor 30
The distance between the human body sensor 30 and the person (user) is detected based on the level of the detection signal from the sensor and the distance data is output to the angle calculation unit 120.

[0014] The angle calculation unit 120 is a user position detection unit 1
The spread angle of the two speakers 50A and 50B with respect to the position of the person is calculated based on the distance data from 10 and the previously stored interval between the two speakers 50A and 50B. That is, if the position of the person is close, the two speakers 5
It is calculated that the spread angles of 0A and 50B are large, and conversely, if the position of the person is far, the two speakers 50A and 50B
It is calculated that the spread angle of B is small. Then, the calculation result is output to the arithmetic unit 130.

The arithmetic unit 130 performs an arithmetic process on the input audio signal based on the angle calculated by the angle calculating unit 120, generates an audio signal representing a virtual speaker having a sufficient feeling of spread, and generates two audio signals. 50
A, 50B. Since the arithmetic unit 130 requires high-speed arithmetic processing such as a large number of conversion processes and filter arithmetic operations, it is assumed that a DSP is used.

FIG. 3 is an explanatory diagram for explaining a specific processing method of the audio signal processing circuit shown in FIG. 2, and FIG. 4 is an explanatory diagram showing a position of a person with respect to the display device. Hereinafter, a specific processing method in this example will be described with reference to these drawings. First, when a person exists at the position A, this is detected by the human body sensor 30, and the distance data from the user position detection unit 110 is L2.
The distance between the speakers 50A and 50B is L1.
Therefore, each speaker 50A,
The spread angle θ1 of 50B is calculated. The calculation unit 130 performs a calculation using the angle θ1 as a parameter, and performs signal processing on the input audio signal so as to set the virtual speakers 60A and 60B that are optimal for the position A of the person. Then, the audio signal subjected to the signal processing is transmitted to the speaker 50.
A, 50B.

Next, when a person is present at the position B, this is detected by the human body sensor 30, and the distance data from the user position detecting unit 110 is L3. The distance between the speakers 50A and 50B is L1. Therefore, the angle calculation unit 120 calculates the spread angle θ2 of each of the speakers 50A and 50B. The arithmetic unit 130 calculates the angle θ
The calculation is performed using 2 as a parameter, and the signal processing of the input audio signal is performed so that the virtual speakers 60A and 60B optimal for the position B of the person are set. Then, the processed audio signal is output to the speakers 50A and 50B.

In this way, the calculation unit 130 determines the position of the virtual speaker so that the user can hear the sound in such a manner that the sound spreads in a constant manner in accordance with the change in the position of the person, and obtains an optimal sense of realism. The obtained audio signal is output to the two left and right speakers 50A and 50B. For example, if the user approaches from the display device, the virtual speaker 60
When the distance between the virtual speakers A and 60B is reduced and the user moves away from the display device, the distance between the virtual speakers 60A and 60B is increased to ensure the optimal sound spread.

As described above, in the display device of this embodiment, the position of the user is detected by the human body sensor 30, and the two speakers 50 viewed from the user based on the position data.
Since the angle indicating the spread of A and 50B is calculated, and the input audio signal is calculated in accordance with the angle, the user can hear the sound of the sound having the same spread at any position. In particular, the speaker 50 detects the detection signal of the human body sensor 30.
A simple configuration in which the spread angles of A and 50B are calculated and input as parameters to a calculation process for a virtual speaker by a conventionally known DSP for a virtual speaker makes it possible to set an optimum virtual speaker, and is simple and inexpensive. There is an advantage that can be realized as a display device.

The present invention is not limited to the above-described backlight type liquid crystal display device, but can be similarly applied to other display devices having a sound output function using virtual speakers. Also, in the above example,
Speakers 50A, 5A are attached to the base 40A of the stand 40.
0B has been described, but the present invention is not limited to this. For example, the flat panel unit 1
It may be provided at 0 or the like. Further, in the above-described example, the case where the human body sensor 30 is provided on the flat panel unit 10 has been described, but the present invention is not limited to this, and may be provided on the stand unit 40 or the like. .

In the above example, one human body sensor 3
Although the configuration for detecting a person by 0 has been described, a person may be detected by a plurality of human sensors.
Further, in the above-described example, the example in which the interval between the virtual speakers is changed according to the position of the person has been described. However, in addition to the positions of the virtual speakers, the output level may be finely adjusted.

[0022]

As described above, in the display device of the present invention, a human body sensor detects a person in front of the display screen, and a distance between the human body sensor and the person is detected based on the detection signal. The spread angle of the two speakers is calculated, and based on this angle, an audio signal representing a virtual speaker having a sufficient spread feeling is output to the two speakers. Therefore, when the position of the user with respect to the display device changes, the virtual speaker can be set to an optimum position according to the position, and there is an effect that a sound characteristic full of a sense of realism can always be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a peripheral portion of a display screen in a display device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an audio signal processing circuit of the display device shown in FIG.

FIG. 3 is an explanatory diagram for describing a specific processing method of the audio signal processing circuit shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a position of a person with respect to the display device shown in FIG. 1;

FIG. 5 is a front view showing an example of a conventional display device.

FIG. 6 is a plan view showing an arrangement of virtual speakers in a conventional display device.

[Explanation of symbols]

10 flat panel section, 20 display screen, 30
... Sensor, 40 Stand Unit, 50A, 50B Speaker, 110 User Position Detecting Unit, 120 Angle Calculating Unit, 130 Computing Unit

Claims (7)

[Claims] 1. A display device having a display screen and at least two speakers, a human body sensor for detecting a person in front of the display screen, and a human body sensor and the person based on a detection signal from the human body sensor. A user position detecting unit that detects a distance between the two speakers, and a detection result from the user position detecting unit and a position of the two speakers.
An angle calculator for calculating a spread angle of the two speakers, and a calculator for calculating an input audio signal based on the angle calculated by the angle calculator and outputting the processed signal to the two speakers. Display device. 2. The display device according to claim 1, wherein the arithmetic unit performs arithmetic processing for setting a position of a virtual speaker that outputs the input audio signal. 3. The operation unit according to claim 1, wherein the operation unit includes a digital signal processor.
A display device as described in the above. 4. The display device according to claim 1, wherein the display device is a flat panel display device having a flat panel portion having a display screen. 5. The display device according to claim 4, further comprising a stand supporting the flat panel unit, wherein the two speakers are built in the stand. 6. The two loudspeakers have a base portion arranged on an installation surface of a display device, and an arm portion erected on the base portion to support the flat panel portion. The display device according to claim 5, wherein the display device is disposed on the base portion. 7. The display device according to claim 4, wherein the human body sensor is provided near a display screen of the flat panel unit.