JP2003274500A - Image display apparatus and method with surround function, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation of a surround system. <P>SOLUTION: Since the image display apparatus with a surround function (projector) 1 is configured to integrate a surround sound output section 10 and an image display section 20, having only to interconnect loudspeakers 4a to 4d can complete installation of the surround system and enables a user to enjoy a home theater. Since it is not necessary for the user to connect an amplifier or the like, the installation of the surround system is facilitated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to adjustment of the position, posture, etc. of a speaker in a surround system.

[0002]

2. Description of the Related Art A large-screen home theater is a conventional three-tube type C
RT projectors were the mainstream, but recently, due to the improvement in the performance of liquid crystal projectors, home theaters have become relatively inexpensive. In terms of sound, the environment has been improved in recent years, for example, a system with a larger surround effect, such as 5.1 ch from Dolby, has been marketed. Therefore, by providing a large screen and a surround system at present, it is possible to configure and enjoy a home theater at a relatively low cost even at home.

In order to enjoy the power of a large screen, audio equipment such as a surround system is important. In general, surround is often assembled in a system different from that of an image projector or TV receiver.

When the surround is assembled and installed in another system, it is useful to measure a sound image or a sound field. Here, a technique for measuring a sound image or a sound field is disclosed in JP-A-5-304700, JP-A-7-107600, and JP-A-2001-2.
It is described in Japanese Patent No. 18300. In addition, Japanese Patent Publication No. 2000-509220 discloses that the gain is digitally controlled in the input / output channel.

[0005]

However, installation of the surround system is not easy. That is, the surround system requires a large number of 4 to 5 or more speakers, unlike ordinary stereo. Moreover, a sufficient surround effect cannot be obtained unless the speaker is correctly installed. Furthermore, the effect varies considerably depending on the arrangement of furniture and changes in listening position. More difficult than installing such a speaker is
It is the installation of an amplifier etc. for driving the speaker.

Therefore, an object of the present invention is to facilitate installation of a surround system.

[0007]

In view of the above-mentioned problems, the invention according to claim 1 includes a surround sound output means for outputting sound through a plurality of speakers so as to produce a surround effect, and a surround sound output means. Image display means for displaying an image in cooperation with the output sound.

According to the image display device with the surround function configured as described above, the surround sound output means outputs the sound so as to produce the surround effect through the plurality of speakers. The image display means displays an image that cooperates with the sound output by the surround sound output means.

In view of the above problems, the invention according to claim 2 is the invention according to claim 1, further comprising a surround effect measuring means for measuring the surround effect based on the sound output by the surround sound output means. Is configured as follows.

In view of the above problems, the invention according to claim 3 is the invention according to claim 2, wherein the surround effect measuring means has a measuring microphone for acquiring the sound output by the surround sound output means. Is configured as follows.

In view of the above problems, the invention set forth in claim 4 is the invention set forth in claim 3, which is configured to incorporate a measurement microphone.

In view of the above problems, the invention according to claim 5 is the invention according to claim 4, which is configured to be coupled to the measuring microphone through a cord.

In view of the above problems, the invention according to claim 6 is the invention according to claim 2, further comprising a calibration determining means for determining a calibration method for the surround effect based on the measured surround effect. Is configured as follows.

In view of the above problems, the invention set forth in claim 7 is the invention set forth in claim 6, wherein the calibration determination means is:
It is configured to determine the angle or distance at which the speaker should be moved by determining the posture or position of the speaker from the measured surround effect.

In view of the above-mentioned problems, the invention according to claim 8 is the invention according to claim 7, wherein the surround effect measuring means determines the sound pressure of the sound output by the surround sound output means as the surround effect. It is configured to measure frequency characteristics.

In view of the above problems, the invention according to claim 9 is the invention according to any one of claims 6 to 8, wherein the image display means further displays the determination result of the calibration determination means. Is configured as follows.

In view of the above problems, the invention according to claim 10 is the invention according to claim 9, wherein the image display means is
It is configured to display the angle or distance at which the speaker should be moved.

In view of the above problems, the invention according to claim 11 is the invention according to claim 9, wherein the image display means is
It is configured to display the position where the speaker should be placed.

In view of the above problems, the invention according to claim 12 is the invention according to claim 2, wherein the image display means is
It is configured to display the measured surround effect.

In view of the above problems, the invention according to claim 13 is the invention according to any one of claims 6 to 8, wherein the image display means displays the measured surround effect, Alternatively, the calibration determination means is configured so that it can be set to display the determination result.

In view of the above problems, the invention according to claim 14 is the invention according to claim 1, wherein the surround sound output means determines whether or not it is connected to a speaker, and the image display means is If there is a speaker that is not connected, that fact is displayed.

In view of the above problems, the invention of claim 15 is the invention of claim 2, wherein the surround effect measuring means determines whether or not there is a speaker with no sound,
The image display means is configured to display that there is a speaker with no sound, if any.

In view of the above problems, the invention according to claim 16 is the invention according to claim 2, wherein the sound output from the surround sound output means is controlled based on the measurement result of the surround effect measuring means. Is composed of.

In view of the above problems, the invention according to claim 17 is the invention according to claim 1, wherein the surround sound output means is configured to be replaceable for each surround system.

In view of the above problems, the invention of claim 18 is the invention of claim 1, wherein the surround sound output means is configured to identify the speaker.

In view of the above problems, the invention according to claim 19 cooperates with a surround sound output step of outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output by the surround sound output step. It is configured to include an image display step of displaying the image, and a surround effect measuring step of measuring the surround effect based on the sound output by the surround sound output step.

In view of the above problems, the invention according to claim 20 cooperates with a surround sound output means for outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output by the surround sound output means. A program for causing a computer to execute a surround effect measuring process in an image display device with a surround function, which comprises an image display means for displaying an image, and measures the surround effect based on a sound output from a surround sound output means. Is a program for causing a computer to execute a surround effect measurement process.

In view of the above problems, the invention as set forth in claim 21 is the program as set forth in claim 20, wherein the program can be changed.

In view of the above problems, the invention according to claim 22 is the program according to claim 21, which is a program that is changed according to a change in the surround effect.

In view of the above problems, the invention according to claim 23 is the program according to claim 21, wherein the program is a program changeable via a network.

In view of the above problems, the invention according to a twenty-fourth aspect is a computer-readable recording medium in which the program according to the twentieth aspect is recorded.

In view of the above problems, the invention of claim 25 cooperates with a surround sound output step of outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output by the surround sound output step. A surround effect measurement process that measures the surround effect based on the image display process that displays the image and the sound output from the surround sound output process, and a calibration determination that determines the surround effect calibration method based on the measured surround effect And a process.

In view of the above problems, the invention as set forth in claim 26 cooperates with a surround sound output means for outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output by the surround sound output means. A program for causing a computer to execute a surround effect measuring process in an image display device with a surround function, which comprises an image display means for displaying an image, and measures the surround effect based on a sound output from a surround sound output means. A program for causing a computer to execute a surround effect measuring process for performing a calibration and a calibration determining process for determining a surround effect calibration method based on the measured surround effect.

In view of the above problems, the invention according to claim 27 is a computer-readable recording medium in which the program according to claim 26 is recorded.

In view of the above problems, the invention according to claim 28 cooperates with a surround sound output step of outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output by the surround sound output step. And an image display step of displaying the selected image.

In view of the above-mentioned problems, the invention according to claim 29 cooperates with a surround sound output process for outputting a sound through a plurality of speakers so as to produce a surround effect, and a sound output in a surround sound output step. And a program for causing a computer to execute an image display process for displaying the selected image.

In view of the above problems, the invention according to claim 30 is a computer-readable recording medium in which the program according to claim 29 is recorded.

[0038]

1 is a diagram showing an arrangement of an image display device (projector) 1 with a surround function according to a preferred embodiment of the present invention. Speakers 4a, 4b, 4
c and 4d output sounds so as to produce a surround effect. The image display device 20 displays an image on the screen 90. This image cooperates with the sounds of the speakers 4a to 4d, and the user 100 can enjoy a home theater in which the image and the sound cooperate. The user 100 is directly behind the image display device 20 and sets the operation of the projector 1 using the remote controller 2. The projector 1 has a microphone 36.
The reference signal sounds from the speakers 4a to 4d are received by a and 36b, and the surround effect is measured and the calibration method is determined. Although there are four speakers 4a to 4d, the present invention can be applied to a stereo having only two speakers in front.

FIG. 2 is a functional block diagram showing the structure of the image display device (projector) 1 with the surround function. The projector 1 includes a surround sound output unit 10, an image display device 20, a surround effect measurement unit 30, a calibration determination unit 40, a display content selection unit 50, a setting reception unit 60, a guidance recording unit 70, and a video source recording unit 80. In addition,
Speakers 4a to 4d are connected to the projector 1. In order not to connect the speakers 4a to 4d by mistake, labels or terminal numbers may be assigned to each speaker. The projector 1 is set by the remote controller 2.
Further, the projector 1 has the above-mentioned respective parts (the surround sound output part 10, the image display device 20, etc.) integrated, and is of a small size of the size of a liquid crystal projector.

The surround sound output section 10 includes a speaker 4a.
Sounds are output via 4d to produce a surround effect. The surround sound output unit 10 is preferably replaceable for each surround system. However, the surround sound output unit 10 has a CPU, hardware, and software, and the hardware of the surround sound output unit 10 is a CP.
It is also possible to let U read and control the software. In such a case, the software may be replaced for each surround system. The software can be obtained through a network such as the Internet. The software may be recorded in a recording medium such as a floppy disk (trademark) or a CD-ROM. In this case, the hardware includes a recording medium reading device and a recording device (such as a hard disk),
The recording medium reading device reads the software from the recording medium and installs it on the recording device. The surround sound output unit 10 includes a surround processor 12, a reference signal sound generation unit 14, an amplifier 16, and a connected speaker identification unit 1.
Have eight.

The surround processor 12 receives the audio signal from the video source recording section 80, performs predetermined processing so as to produce a surround effect, and outputs the processed signal. At this time,
Which of the speakers 4a to 4d produces which sound is designated. For example, the surround processor 12 is a dedicated DSP (Digital Signal Processor) or a CPU (Central Processing Unit) that measures the surround effect and controls the image display device 20. Since the CPU has a high calculation speed in recent years, it can be sufficiently used as the surround processor 12.

The reference signal sound generator 14 generates a reference signal sound used for measuring the surround effect. The reference signal sound is, for example, white noise. At this time, it is designated from which of the speakers 4a to 4d the reference signal sound is to be emitted.

The amplifier 16 is the surround processor 12
Or the output of the reference signal sound generator 14 is amplified.

The connected speaker identifying unit 18 identifies the speakers 4a to 4d connected to the surround sound output unit 10. Further, the connected speaker identifying unit 18 outputs the audio signal output from the amplifier 16 to the speakers 4a to 4d. As a result, the surround sound output unit 10 causes the speaker 4 to
Sound can be output via a to 4d.

The surround processor 12 and the reference signal sound generator 14 specify from which speaker the sound is to be emitted. Therefore, the connected speaker identifying unit 18 identifies the speakers 4a to 4d and outputs the sound from the designated speaker. As a specific method for identification, it is conceivable that the speakers 4a to 4d have a built-in identification resistance and the connected speaker identification unit 18 measures the resistance value of the identification resistance.

Further, in the connected speaker identifying section 18, one of the speakers 4a to 4d is the surround sound output section 1.
If the speaker is not connected to 0, the speaker for which the speaker is not connected to the terminal of the surround sound output unit 10 corresponding to which speaker is output to the image display device 20. The image display device 20 displays so that it can be seen which speaker is not connected. The terminal of the surround sound output unit 10 corresponding to the speaker has a different impedance when the speaker is connected (usually about 4 to 16 ohms) and an impedance when the speaker is not connected. Therefore,
If the connected speaker identification unit 18 measures the impedance of the terminal of the surround sound output unit 10 corresponding to the speaker,
It can be determined which terminal the speaker is not connected to.

The image display device 20 includes a video source recording section 8
A video signal is received from 0, and an image that cooperates with the sound having the surround effect output by the surround sound output unit 10 is displayed. The image display device 20 is a normal liquid crystal projector. The image display device 20 displays the image by projecting the image on the screen 90 shown in FIG.
In addition, the image display device 20 includes a surround effect (sound pressure-frequency characteristic of the reference signal sound output from the surround sound output unit 10), a calibration method (distance or angle to move the speakers 4a to 4d), guidance ( Standard speaker 4a
4 to 4d), information for identifying a speaker that is not connected, information for identifying a speaker that does not output sound, and the like are displayed.

However, it is conceivable that the image display device 20 has a CPU, hardware, and software, and the CPU controls the hardware of the image display device 20 by reading the software. The software may be recorded in a recording medium such as a floppy disk (trademark) or a CD-ROM. In this case, the hardware includes a recording medium reading device and a recording device (such as a hard disk), and the recording medium reading device reads the software from the recording medium and installs it in the recording device.

It is assumed that what is displayed in addition to the video signal received from the video source recording section 80 is projected on the screen 90. However, a liquid crystal or LED may be provided in the main body of the projector 1 to perform such display. This makes it possible to adjust the surround while viewing the liquid crystal or the LED while giving a presentation using the screen 90.

The surround effect measuring section 30 measures the surround effect based on the reference signal sound output from the surround sound output section 10. Here, the surround effect measuring unit 30
However, it is also conceivable to have a CPU, hardware, and software so that the CPU controls the hardware of the surround effect measurement unit 30 by reading the software.
Software is floppy disk (trademark), C
It may be recorded in a recording medium such as a D-ROM. In this case, the hardware includes a recording medium reading device and a recording device (such as a hard disk), and the recording medium reading device reads the software from the recording medium and installs it in the recording device. The surround effect measuring unit 30 includes a microphone amplifier 32 and a surround effect measuring unit 3.
4, (omnidirectional) microphones 36a and 36b.

The microphone amplifier 32 amplifies the reference signal sound received by the microphones 36a, 36b, and outputs the surround effect measuring section 34.
Output to.

The surround effect measuring section 34 includes a microphone 36.
The sound pressure-frequency characteristics of the reference signal sounds received by a and b are measured. That is, FFT (fa
st Fourier transform) to obtain a histogram of sound pressure level for each band. If there is a speaker with no sound, that speaker is specified. As will be described later, the reference signal sound is emitted from the speaker 4a to measure the sound pressure-frequency characteristics, and the same applies to the speakers 4b, 4c, and 4d. Measure the pressure-frequency characteristics. Therefore, when a speaker with no sound is measured, the sound pressure becomes 0, so that it can be easily specified.

The microphones 36a, 36b acquire the reference signal sound output from the surround sound output section 10 via the speakers 4a-4d. The microphones 36a and 36b may be attached to the outside of the projector 1 as shown in FIGS. In this case, for example, a cord is used for connection. In this case, the degree of freedom in layout of the microphones 36a and 36b is high. The microphones 36a and 36b are connected to the projector 1
It may be built in. In this case, the microphone 36
It is possible to prevent the loss of a and b. It is also conceivable that the built-in microphone is omnidirectional and the external microphone is directional to improve the measurement accuracy by using both the built-in microphone and the external microphone.
Furthermore, an omnidirectional microphone may be used only as a built-in one.

The arrangement of the speakers 4a-4d and the (non-directional) microphones 36a, 36b is shown in FIG. 3 (a). Speaker 4
“A” is arranged at the front left, speaker 4b is arranged at the front right, speaker 4c is arranged at the rear left, and speaker 4d is arranged at the rear right. The (non-directional) microphone 36a is arranged slightly forward and is connected to the speaker 4
The reference signal sounds emitted from c and 4d are received. The (non-directional) microphone 36b is arranged slightly rearward, and the speaker 4
The reference signal sounds emitted from a and 4b are received. Microphone 3
Since 6a and 6b are omnidirectional, in principle, only one is required. However, even an omnidirectional microphone has a low sensitivity (gain) behind the microphone, so that the front speakers 4a and 4b are for measurement ((omnidirectional) microphone 36b) and the rear speakers 4c and 4d are for measurement ( It is preferable to use two microphones (non-directional) microphone 36a). However, only one microphone may be used if it is a type that can record stereo with one.

Here, instead of the (non-directional) microphones 36a, 36b, (directional) microphones 38a, 38b, 38c, 3
8d may be used. Speakers 4a to 4 in this case
d and (directivity) microphones 38a to 38d are arranged in FIG.
It shows in (b). The arrangement of the speakers 4a to 4d is shown in FIG.
It is similar to (a). The (directivity) microphone 38a is arranged toward the speaker 4a. In the case of FIG. 3 (b),
(Directivity) The microphone 38a has an elliptical shape, and the major axis of the elliptical shape faces the speaker 4a. Similarly, the (directional) microphone 38b is arranged toward the speaker 4b, and the (directive) microphone 38c is arranged toward the speaker 4c.
The (directivity) microphone 38d is arranged toward the speaker 4d. The (directivity) microphones 38a, 38b are for measuring the front speakers 4a, 4b, and the (directivity) microphones 38
Reference characters c and 38d are for measuring the rear speakers 4c and 4d. When the (directional) microphones 38a to 38d are used, the measurement accuracy of the surround effect is higher than when the (omnidirectional) microphones 36a and 36b are used, but since many microphones are required, the measurement is troublesome. It takes. However, after the measurement of the speakers 4a and 4b is completed, the (directivity) microphone 38
If the directions of a and 38b are changed by 180 degrees, (directivity)
The microphones 38c and 38d can be omitted.

The measurement result of the surround effect measuring section 34 will be described with reference to FIG. As shown in FIG. 4A, the speaker 4 is arranged on the axis of the (directivity) microphone 38, and the speaker 4 ′ is arranged 30 degrees away from the axis of the (directivity) microphone 38. 'Is placed 45 degrees off the axis of the (directional) microphone 38. At this time, the sound pressure-frequency characteristic of the sound received by the (directional) microphone 38 when the reference signal sound is emitted from each of the speakers 4, 4 ', 4''is shown in FIG. 4 (b). As shown in FIG. 4B, the sound pressure-frequency characteristic has a (directional) microphone 38.
As the angle deviated from the axis increases, ・ The sound pressure level generally decreases, ・ The sound pressure level in the high frequency part (high range) and the low frequency part (low range) greatly decreases (especially in the high range part) ), Has the property. In consideration of this property, it is possible to determine the deviation (angle) of the (directivity) microphone 38 of the speaker 4 from the axis. The same applies to the (non-directional) microphone 36.

The calibration judging unit 40 judges the calibration method of the surround effect based on the surround effect (sound pressure-frequency characteristic) measured by the surround effect measuring unit 30. Here, it is conceivable that the calibration determining unit 40 has a CPU, hardware, and software, and the CPU controls the hardware by reading the software. In addition,
Software is floppy disk (trademark), CD-R
It may be recorded in a recording medium such as OM. In this case, the hardware includes a recording medium reading device and a recording device (such as a hard disk), and the recording medium reading device reads the software from the recording medium and installs it in the recording device. The calibration determining unit 40 includes a calibration method deriving unit 42, a fundamental frequency characteristic recording unit 44, and a sound adjusting unit 46.
Have.

The calibration method deriving unit 42 is based on the surround effect (sound pressure-frequency characteristic) and the fundamental frequency characteristic measured by the surround effect measuring unit 30, and the speakers 4a.about.
Determine the posture or position of 4d. And the speaker 4a
Determine the angle or distance to move ~ 4d.

The fundamental frequency characteristic recording section 44 is used for the speaker 4
a to 4d are (directional) microphone 38 (or (non-directional)
Sound pressure for each of the speakers 4a to 4d when properly arranged as viewed from the microphone 36).
Record the frequency response.

That is, the sound pressure-frequency characteristic when the reference signal sound is emitted from the speaker 4a and received by the (directivity) microphones 38a and 38b (or the (omnidirectional) microphone 36a) is recorded. Further, the sound pressure-frequency characteristic when the reference signal sound is emitted from the speaker 4b and received by the (directivity) microphones 38a and 38b (or (non-directional) microphone 36a) is recorded. Further, the sound pressure-frequency characteristic when the reference signal sound is emitted from the speaker 4c and received by the (directional) microphones 38c and 38d (or (non-directional) microphone 36b) is recorded. Then, the sound pressure-frequency characteristic when the reference signal sound is emitted from the speaker 4d and received by the (directivity) microphones 38c and 38d (or (omnidirectional) microphone 36b) is recorded.

The operation principle of the calibration method deriving unit 42 will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram showing the arrangement and sound pressure-frequency characteristics when the speaker 4a is properly arranged as seen from the (directional) microphones 38a and 38b. Since the speaker 4a is disposed on the axis of the (directional) microphone 38a, the sound pressure-frequency characteristic of the sound received by the (directional) microphone 38a maintains a substantially constant sound pressure in a wide frequency band. On the other hand, the sound pressure-frequency characteristic of the sound received by the (directional) microphone 38b is such that the speaker 4a is arranged far from the axis of the (directive) microphone 38b and the distance is large, so that the midrange of the frequency band. There is a little sound pressure. Such sound pressure-frequency characteristics are recorded in the basic frequency characteristic recording unit 44 for each speaker.

On the other hand, in FIG. 6, the speaker 4a is (directivity).
If the microphone 38a is placed improperly,
It is a figure which shows arrangement | positioning and a sound pressure-frequency characteristic. Since the speaker 4a is displaced from the axis of the (directional) microphone 38a by an angle θ, the sound pressure-frequency characteristic of the sound received by the (directional) microphone 38a has a low sound pressure level as a whole. , The sound pressure level drops significantly in the high and low frequencies. On the other hand, in the sound pressure-frequency characteristic of the sound received by the (directional) microphone 38b, the sound from the speaker 4a easily enters, so that the sound pressure in the middle range of the frequency band rises, but the sound pressure in the high range and the low range. The level of.

The principle is the same for other speakers, and the same applies when the omnidirectional microphones 36a and 36b are used.

As described above, the sound pressure-frequency characteristics are different depending on whether the arrangement of the speakers is proper or not. Therefore, the calibration method deriving unit 42 uses the fundamental frequency characteristic recording unit 44.
If the sound pressure-frequency characteristics in the case where the placement of the speakers is proper is read from and compared with the surround effect (sound pressure-frequency characteristics) measured by the surround effect measuring unit 30,
The posture of the speaker with respect to the microphone (for example, the angle θ shown in FIG. 6) can be obtained. Therefore, the angle at which the speaker should be moved can be determined based on this posture. For example, if the speaker 4a is arranged as shown in FIG. 6, it can be determined that the speaker should be moved by the angle −θ.

The position of the speaker can be obtained in the form of the distance to the microphone. As shown in FIG. 7, when the distance between the speaker and the microphone is short, the sound pressure-frequency characteristic maintains a substantially constant sound pressure in a wide frequency band (see FIG. 7A). When the distance between the speaker and the microphone is long, the sound pressure-frequency characteristics generally have a low sound pressure level, and the sound pressure level in a high frequency portion (high tone) and a low frequency portion (low tone) greatly decreases (see FIG. See b)). Therefore, the distance between the speaker and the microphone can be known by comparing the average sound pressures in the midrange. Since bass and treble are easily attenuated, it is preferable to use the average of the sound pressure in the middle range for determining the distance.

Therefore, the calibration method deriving unit 42 reads out the sound pressure-frequency characteristic when the arrangement of the speakers is proper from the fundamental frequency characteristic recording unit 44, averages the sound pressure in the middle range, and determines the surround effect measuring unit 30. When compared with the average of the sound pressure in the middle range of the surround effect (sound pressure-frequency characteristic) measured by, the position of the speaker can be obtained in the form of the distance to the microphone of the speaker. Therefore, the distance to move the speaker can be determined based on this distance. However, even when the speaker is inclined from the axis of the microphone, the sound pressure is attenuated and becomes small. Therefore, the distance to move the speaker is determined in combination with the determination of the posture of the speaker with respect to the microphone.

By using the sound pressure-frequency characteristics in this way, the angle or distance to which the speakers 4a to 4d should be moved can be obtained. Actually, due to sound diffraction, reflection, etc., it may not be possible to obtain the best state by only the sound pressure-frequency characteristics. However, basic adjustment is possible by using only the sound pressure-frequency characteristics.

The sound adjusting section 46 receives the setting by the operation of the remote controller 2 from the setting receiving section 60 and controls the amplifier 16.
Alternatively, the amplifier 16 is controlled based on the surround effect (sound pressure-frequency characteristic) measured by the surround effect measuring unit 30. In either case, the sound control unit 46
It will control the volume and tone. For example, according to the measurement result of the sound pressure-frequency characteristic, it is assumed that the sound pressure is too low in a certain speaker. In this case, the gain of the amplifier that supplies the audio signal to the speaker is increased. However, in this adjustment, since the physical position of the speaker remains the same, the direction of the sound is not improved, and it can be said to be an auxiliary means.

The display content selection unit 50 indicates the surround effect (sound pressure-frequency characteristic) measured by the surround effect measuring unit 34, or the angle or distance at which the speakers 4a to 4d should be moved, which are obtained by the calibration method deriving unit 42. Either one is read out and output to the image display device 20 for display.
Which one is displayed can be selected by the remote controller 2 via the setting receiving unit 60. When the surround effect measuring unit 34 identifies a speaker with no sound, the presence / absence of the display can be selected.

The setting receiving section 60 receives the setting made by the remote controller 2 and sends the setting content to the display content selecting section 50 or the sound adjusting section 46.

The guidance recording unit 70 includes the speakers 4a to 4a.
Record the position where 4d should be placed. The recorded content is a standard arrangement. The recorded contents of the guidance recording unit 70 are read and displayed by the image display device 20.

The video source recording section 80 records the audio signal and the video signal. The video source recording unit 80 is, for example, a DVD. The surround sound output unit 10 reads and outputs the audio signal of the video source recording unit 80, and the image display device 20 reads and displays the video signal of the video source recording unit 80. This allows the user to enjoy the home theater.

Next, the operation of the embodiment of the present invention will be described.

First, a process relating to sound collection is performed, and then a calibration method is determined and displayed based on the collected signal. The processing relating to sound collection will be described with reference to the flowchart in FIG.

The reference signal sound generator 14 generates a reference signal sound. The reference signal sound is amplified by the amplifier 16 and output from any one of the speakers 4a to 4d via the connected speaker identifying unit 18 (S10).

Next, the sound is picked up by the (non-directional) microphones 36a, 36b or the (directional) microphones 38a to 38d corresponding to the speaker that generated the sound (S12).

Here, if the sound cannot be collected (S14, N
o), it can be seen that no sound is output from the speaker. It is considered that this is due to disconnection or failure of the speaker. Therefore, the image display device 20 urges the speaker to be adjusted or exchanged by displaying the speaker with no sound so that the speaker can be seen, and the process returns to the generation of the reference signal sound (S10). If the sound can be collected (S14, Yes), the collected sound is amplified by the microphone amplifier 32 to be a signal, and this signal is stored in the surround effect measuring unit 34 (S16).

Then, after the sound collection is completed for all the speakers (S18, Yes), the processing concerning the sound collection is ended.

For example, as shown in FIG. 3B, it is assumed that speakers 4a to 4d and (directivity) microphones 38a to 38d are arranged. First, a reference signal sound is generated via the speaker 4a (S10), and the reference signal sound is collected by the (directivity) microphones 38a and 38b (S12). The collected sound is amplified by the microphone amplifier 32 and stored in the surround effect measuring unit 34 (S16).

Then, a reference signal sound is generated through the speaker 4b (S10), and the reference signal sound is the (directional) microphone 3
Sound is collected by 8a and 38b (S12). The collected sound is amplified by the microphone amplifier 32 and stored in the surround effect measuring unit 34 (S16).

Further, a reference signal sound is generated via the speaker 4c (S10), and the reference signal sound is the (directional) microphone 3
Sounds are collected by 8c and 38d (S12). The collected sound is amplified by the microphone amplifier 32 and stored in the surround effect measuring unit 34 (S16).

Finally, the reference signal sound is generated through the speaker 4d (S10), and the reference signal sound is the (directional) microphone 3
Sounds are collected by 8c and 38d (S12). The collected sound is amplified by the microphone amplifier 32 and stored in the surround effect measuring unit 34 (S16).

Here, since the sound collection is completed for all the speakers 4a to 4d (S18, Yes), the sound collection process is terminated.

The speakers 4a, 4b, 4c, and 4d were measured in this order, but they are not necessarily restricted to this order.

Next, the calibration method is judged and displayed based on the collected signals. A process for determining and displaying the calibration method will be described with reference to the flowchart of FIG.

First, the surround effect measuring section 34 uses an FFT (fast F
ourier transform) to obtain the histogram of sound pressure level for each band. As a result, sound pressure-frequency characteristics are obtained (S20).

If the display of the calibration method (angle or distance to move the speakers 4a to 4d) is not selected by the display content selection unit 50 (S22, No), the image display device 20 displays the sound pressure-frequency characteristics. It is displayed (S32).

Such a display is a display for so-called enthusiasts. If it is a maniac, the posture and position of the speakers 4a to 4d can be corrected by their own judgment based on the sound pressure-frequency characteristics. At this time, the characteristics of the speaker original may be recorded, for example, in the surround sound generation unit 10 and the like, and the image display device 20 may read and display the characteristics. That is, this is usually done by an audio spectrum analyzer or the like, and in the present embodiment, the projector 1 can be substituted.

If the display of the calibration method (the angle or distance at which the speakers 4a to 4d should be moved) is selected by the display content selection unit 50 (S22, Yes), the calibration method derivation unit 42 causes the fundamental frequency characteristic recording unit. The sound pressure-frequency characteristic when the arrangement of the speakers is proper is read from 44, and the sound pressure-frequency characteristic based on the collected sound is read from the surround effect measuring section 34 to determine the calibration method (S24).

Then, the calibration method is displayed on the image display device 20 (S26). FIG. 10 shows a display example of the angle to be moved as a calibration method. As shown in FIG. 10A, a plan view of the speaker viewed from above is shown, and the current orientation (displayed by a broken line), proper orientation (displayed by a solid line), and angle (arrow) to move the speaker are also shown. Good. It is even better to display the value of the angle to be moved at this time. Alternatively, as shown in FIG. 10B, a front view of the speaker viewed from the front is shown.
The direction to move may be indicated by a three-dimensional arrow. It is even better to display the value of the angle to be moved at this time. Such a display is preferable for a beginner who is not familiar with the arrangement of the surround system.

The adjustment of the positions or the postures of the speakers 4a to 4d is generally performed after the above measurement is completed. However, it is also conceivable to adjust any one of the speakers 4a to 4d (for example, only the speakers 4a and 4b) and then further adjust the whole.

According to the embodiment of the present invention, the image display device (projector) 1 with the surround function has the structure in which the surround sound output section 10 and the image display section 20 are integrated, so that the speakers 4a to 4d are connected. You can enjoy the home theater by just installing the surround system. Since it is not necessary for the user to connect the amplifier, the surround system can be installed easily. Furthermore, since the projector 1 is not so large, it can be taken out and set quickly.

Since the projector 1 has the surround effect measuring section 30, the surround effect can be measured.
If the surround effect is displayed on the image display unit 20, it is suitable for enthusiasts, and the postures and positions of the speakers 4a to 4d can be corrected by their own judgment.

Further, the calibration judging section 40 has the surround effect (sound pressure-measured by the surround effect measuring section 30).
Based on the frequency characteristics), the angle or distance to move the speakers 4a to 4d is obtained. The angle or distance to move the speakers 4a to 4d is displayed by the image display unit 20. Therefore, even an amateur who does not know how to correct the postures and positions of the speakers 4a to 4d can correct the postures and positions of the speakers 4a to 4d.

Heretofore, it has been assumed that the reference signal sounds are emitted from the speakers 4a to 4d.
The 4d posture or position adjustment has been described. However, the audio signal from the video source recording unit 80 is output to the surround sound output unit 1
The postures or positions of the speakers 4a to 4d can be adjusted even while 0 is read and output from the speakers 4a to 4d, that is, while enjoying the home theater.

When the speakers 4a to 4d are properly arranged, the (directional) microphone 38 when the audio signal of the video source recording section 80 is output from the speakers 4a to 4d.
The sound pressure-frequency characteristics of the sounds received by a to 38d are recorded in the basic frequency characteristic recording unit 44. Then, the surround effect measuring section 30 measures the surround effect (sound pressure-frequency characteristic) of the sound actually received by the (directional) microphones 38 a to 38 d. The calibration method deriving unit 42 obtains the postures or positions of the speakers 4a to 4d from the difference between the recorded contents of the fundamental frequency characteristic recording unit 44 and the measured contents of the surround effect measuring unit 30. Then, the angle or distance to move the speakers 4a to 4d is obtained.

The angles or distances at which the speakers 4a to 4d should be moved are displayed by superimposing on the screen 90 on which the video signal recorded in the video source recording section 80 is projected by the image display section 20. Alternatively, the sound adjusting unit 46 may automatically adjust the sound based on the measurement content of the surround effect measuring unit 30.

Note that, in order to measure the surround effect (sound pressure-frequency characteristics), it is necessary to separate and acquire the sound of each speaker, so it is preferable to use a microphone having a strong directivity. However, when the surround effect (sound pressure-frequency characteristic) is measured, if the sound is temporarily emitted from each of the speakers 4a to 4d, it is possible to use a microphone having a strong directivity. .

Further, when the projector 1 is used as a simple sound measuring device, the video source recording section 80 and the surround processor 12 are unnecessary. In such a case, the projector 1 can be downsized and is lighter and lighter than the CRT type. Moreover, since it is a projection type, it can be projected in a large size, which is convenient for education.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of an image display device (projector) 1 with a surround function according to a preferred embodiment of the present invention.

FIG. 2 is a functional block diagram showing a configuration of an image display device (projector) 1 with a surround function.

FIG. 3 shows speakers 4a to 4d and a (non-directional) microphone 36.
Arrangement of a and b (FIG. 3A), and arrangement of speakers 4a to 4d and (directivity) microphones 38a to 38d (FIG. 3B).
FIG.

[Fig. 4] Layout of speakers (Fig. 4 (a)) and (directivity)
Sound pressure-frequency characteristics of the sound received by the microphone 38 (see FIG. 4).
It is a figure explaining contrasting with (b)).

FIG. 5: Speaker 4a has (directivity) microphones 38a, 38
It is a figure which shows arrangement | positioning and a sound pressure-frequency characteristic at the time of being arrange | positioned appropriately seeing from b.

FIG. 6 is a diagram showing the arrangement and sound pressure-frequency characteristics when the speaker 4a is arranged improperly when viewed from the (directivity) microphone 38a.

[Fig. 7] Sound pressure when the distance between the speaker and the microphone is short-
FIG. 8 is a diagram showing frequency characteristics (FIG. 7A) and sound pressure-frequency characteristics (FIG. 7B) when the distance between the speaker and the microphone is long.

FIG. 8 is a flowchart showing processing relating to sound collection.

FIG. 9 is a flowchart showing processing relating to determination and display of a calibration method.

FIG. 10 is a diagram showing a display example of an angle to be moved as a calibration method.

[Explanation of symbols]

1 Image display device (projector) with surround function 10 Surround sound output section 20 Image display device 30 Surround effect measurement section 40 Calibration judgment unit 50 Display content selection section 60 Setting receiver 70 Guidance recording section 80 Video source recording section

Claims (30)

[Claims] 1. Surround sound output means for outputting sound so as to produce a surround effect through a plurality of speakers, and image display means for displaying an image in cooperation with the sound output by the surround sound output means. Image display device with surround function. 2. The image display device with surround function according to claim 1, wherein the image with surround function is provided with surround effect measuring means for measuring the surround effect based on a sound output by the surround sound output means. Display device. 3. The image display device with a surround function according to claim 2, wherein the surround effect measuring means includes a measuring microphone that acquires a sound output from the surround sound output means. apparatus. 4. The image display device with a surround function according to claim 3, wherein the image display device with a surround function has the built-in measurement microphone. 5. The image display device with a surround function according to claim 4, wherein the image display device with a surround function is coupled to the measurement microphone via a cord. 6. The image display device with a surround function according to claim 2, wherein the image display device with a surround function comprises a calibration judging means for judging a calibration method of the surround effect based on the measured surround effect. . 7. The image display device with surround function according to claim 6, wherein the calibration determination unit moves the speaker by obtaining the posture or position of the speaker from the measured surround effect. An image display device with a surround function that determines the angle or distance that should be used. 8. The image display device with surround function according to claim 7, wherein the surround effect measuring means measures, as the surround effect, a frequency characteristic of sound pressure of a sound output from the surround sound output means. Image display device with surround function. 9. The image display device with surround function according to claim 6, wherein the image display means further displays an image with surround function for displaying a judgment result of the calibration judging means. apparatus. 10. The image display device with surround function according to claim 9, wherein the image display means displays an angle or a distance to move the speaker. 11. The image display device with surround function according to claim 9, wherein the image display means displays a position where the speaker is to be arranged. 12. The image display device with a surround function according to claim 2, wherein the image display means displays the measured surround effect. 13. The image display device with surround function according to claim 6, wherein the image display means displays the measured surround effect or the calibration judgment. An image display device with a surround function that can be set to display the determination result of the means. 14. The image display device with surround function according to claim 1, wherein the surround sound output means determines whether or not the speaker is connected to the speaker, and the image display means is connected. An image display device with a surround function that displays the fact that there is no speaker. 15. The image display device with surround function according to claim 2, wherein the surround effect measuring means determines whether or not there is the speaker without sound, and the image display means An image display device with a surround function that displays the presence of the speaker that does not sound. 16. The image display device with surround function according to claim 2, wherein the image output device with surround function controls the sound output by the surround sound output device based on the measurement result of the surround effect measurement device. . 17. The image display device with a surround function according to claim 1, wherein the surround sound output means is replaceable for each surround system. 18. The image display device with surround function according to claim 1, wherein the surround sound output means identifies the speaker. 19. A surround sound output step of outputting sound so as to produce a surround effect through a plurality of speakers, an image display step of displaying an image in cooperation with the sound output by the surround sound output step, An image display method with a surround function, comprising: a surround effect measuring step of measuring the surround effect based on a sound output in a surround sound outputting step. 20. Surround sound output means for outputting sound via a plurality of speakers so as to produce a surround effect,
A program for causing a computer to execute a surround effect measurement process in an image display device with a surround function, which comprises an image display means for displaying an image in cooperation with a sound output from the surround sound output means, wherein the surround sound A program for causing a computer to execute a surround effect measuring process for measuring the surround effect based on a sound output from the output means. 21. The program according to claim 20, wherein the program is changeable. 22. The program according to claim 21, wherein the program is changed according to the change of the surround effect. 23. The program according to claim 21, wherein the program can be changed via a network. 24. A computer-readable recording medium in which the program according to claim 20 is recorded. 25. A surround sound output step of outputting sound through a plurality of speakers so as to produce a surround effect, an image display step of displaying an image in cooperation with the sound output by the surround sound output step, A surround function including a surround effect measuring step for measuring the surround effect based on the sound output from the surround sound output step, and a calibration judging step for judging a surround effect calibration method based on the measured surround effect. Image display method. 26. Surround sound output means for outputting sound via a plurality of speakers so as to produce a surround effect,
A program for causing a computer to execute a surround effect measurement process in an image display device with a surround function, which comprises an image display means for displaying an image in cooperation with a sound output from the surround sound output means, wherein the surround sound A surround effect measuring process for measuring the surround effect based on the sound output from the output means; a calibration judging process for judging a surround effect calibration method based on the measured surround effect; program. 27. A computer-readable recording medium in which the program according to claim 26 is recorded. 28. A surround sound output step of outputting sound via a plurality of speakers so as to produce a surround effect, and an image display step of displaying an image in cooperation with the sound output by the surround sound output step. Image display method with surround function. 29. Surround sound output processing for outputting sound so as to produce a surround effect through a plurality of speakers; and image display processing for displaying an image in cooperation with the sound output in the surround sound output step. A program that causes a computer to execute. 30. A computer-readable recording medium in which the program according to claim 29 is recorded.