JP2002290877A - Projector and voice output method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector by which a voice from a right channel is heard from a speaker which is arranged in right from a viewer and a voice from a left channel is heard from the speaker arranged in left from the viewer even when the projector is used by suspension from the ceiling or rear projection. SOLUTION: When an operator indicates a 'suspension from ceiling mode' or a 'rear projection mode' via a remote controller 126 and a remote controller signal processing part 128, an MCU 130 controls analog switches 102 and 104 to perform switch-over to a b-side in any case. A right channel voice signal inputted from a voice input terminal Rin is inputted to a left channel speaker LSP via the analog switch 104 and an amplifier 108. A left channel voice signal inputted from a voice input terminal Lin is inputted to a right channel speaker RSP via the analog switch 102 and an amplifier 106. The left channel voice is outputted from the right channel speaker RSP and the right channel voice is outputted from the left channel speaker LSP.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for outputting sound from a stereo speaker built in a projector.

[0002]

2. Description of the Related Art A projector for projecting an image on a screen or the like can be used for a home theater or the like.
It is spreading rapidly.

[0003] Usually, a projector is often used on a desk. Here, the desk-mounted is a form in which the projector is placed on a desk or the like, and an image is projected from the front of the screen and used. For this reason, the right and left sides of the projector are set to the right side and the left side to the screen when the projector is used on a desk, respectively. In general, the viewer is in front of the screen,
View the image displayed on the screen. Therefore, since the projector and the viewer are both facing the same direction, the right and left sides of the projector match the viewer's view from the viewer. Therefore, even if the projector directly projects the image on the screen, the viewer can view the correct image as the image displayed on the screen.

[0004] On the other hand, as a usage form of the projector,
In addition to the above-mentioned desk-mounted, two types of ceiling mount (ceiling) and rear projection are known. Of these, the ceiling mount is a form in which the projector is hung upside down from a ceiling or the like, and an image is projected from the front of the screen and used.Rear projection is to place the projector behind the screen and use the image from the back of the screen. Is used by projecting the image.

When the projector is used as a ceiling mount, the projector is placed upside down, so that the projector is upside down and left and right as viewed from the viewer. Therefore, if the projector directly projects the image on the screen, an image that is inverted up and down and left and right as viewed from the viewer will be displayed.
Also, when using the projector for rear projection, the projector is located behind the screen,
From a viewer in front of the screen, the projector is upside down. Therefore, in this case, if the projector directly projects the image on the screen, an image that is inverted left and right as viewed from the viewer will be displayed.

Therefore, when the projector is used on a ceiling, an image obtained by inverting the original image vertically and horizontally is projected from the projector. When the projector is used for rear projection, the original image is projected. On the other hand, an image in which only the left and right are inverted is projected. By doing so, even when the projector is used for ceiling mount or rear projection, the viewer can see the original correct image as the image displayed on the screen.

In the case of a ceiling mount, the projector is not suspended in an up-down state but in an upside-down state for the following reason. That is, since the projector is usually designed to be tilted (designed so that an image is projected above the bottom surface of the projector when the projector is used on a desk), the projector is suspended vertically in a normal state. If the distance between the bottom surface and the ceiling surface of the projector is not so large, a part of the projected image is blocked by the ceiling surface, and a normal image is not projected on the screen.

[0008] Incidentally, the projector can output not only an image but also a sound, and for that purpose, a built-in speaker is provided. in recent years,
As for the speaker, stereo speakers have been widely used in order to give a more realistic feeling. Such a stereo speaker is mounted inside or outside the housing of the projector such that the right channel speaker is on the right side of the projector and the left channel speaker is on the left side of the projector.

Accordingly, when the projector is used on a desk, as described above, since the left and right sides of the projector coincide with those of the viewer as viewed from the viewer, the right channel speaker is located on the right side as viewed from the viewer. And the left channel speaker is located on the left side. Therefore, for the viewer, the sound to be heard from the right side (the sound of the right channel) is heard from the speaker arranged on the right side, and the sound to be heard from the left side (the sound of the left channel) is relative to the image being viewed. It will be heard from the speaker located on the left, and there is no problem.

[0010]

However, when the projector is used for ceiling or rear projection, as described above, since the projector is at least left and right as viewed from the viewer, the right channel speaker is used. Is arranged on the left side when viewed from the viewer, and the left channel speaker is arranged on the right side. Therefore, for the viewer, the sound that should be heard from the right side (the sound of the right channel) is heard from the speaker arranged on the left side, and the sound that should be heard from the left side (the sound of the left channel) for the image being viewed. ) Is heard from the speaker arranged on the right side, and the sound is reversed left and right with respect to the image, so that there is a problem that a very uncomfortable feeling is felt.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and even when used in a ceiling mount or rear projection, the sound of the right channel is output from a speaker arranged on the right side as viewed from the viewer. It is an object of the present invention to provide a projector in which the sound of the left channel can be heard from a speaker arranged on the left side when viewed from the viewer.

[0012]

In order to achieve at least a part of the above-described object, a projector according to the present invention is a projector capable of projecting an image, wherein the projector is provided inside the projector. Or, a stereo speaker having a right channel speaker and a left channel speaker attached to the outside, a right channel audio signal and a left channel audio signal obtained from a stereo audio signal source are input, and the output destination of the audio signal is selectively selected. In the first switching state, the right channel audio signal is output to the right channel speaker, and the left channel audio signal is output to the left channel speaker. In the second switching state, the right channel audio signal is output. To the left channel speaker and the left channel audio signal to the right channel. In N'nerusupika, to the audio signal switching unit that outputs, in that it comprises the gist.

As described above, in the projector of the present invention,
The audio signal switching unit selectively switches the output destinations of the right channel audio signal and the left channel audio signal. In the first switching state, the right channel audio signal is switched to the right channel speaker, and the left channel audio signal is switched to the left channel speaker. In the second switching state, the right channel audio signal is output to the left channel speaker, and the left channel audio signal is output to the right channel speaker.

Therefore, according to the projector of the present invention,
When the projector is used for ceiling or rear projection, the right channel audio signal is sent to the left channel speaker by setting the audio signal switching unit to the second switching state.
Since the left channel audio signal is supplied to the right channel speaker, respectively, the projector is at least left and right as viewed from the viewer, the right channel speaker is disposed on the left side as viewed from the viewer, and the left channel speaker is Even if it is arranged on the right side, for the viewer, the right channel audio is heard from the left channel speaker arranged on the right side for the image being viewed, and the right channel audio is arranged on the left side for the left channel audio. , And the sound can be heard without any problem, without the sound being reversed left and right with respect to the image.

In the projector according to the present invention, an image processing system capable of selectively switching and projecting a normal image as the image and an inverted image obtained by inverting the normal image vertically and horizontally and the audio signal switching unit Control the
When the image processing system projects the normal image, the audio signal switching unit is set to the first switching state, and when the image processing system projects the inverted image, the audio signal switching unit is activated. A control unit for setting the second switching state.

With such a configuration, even if the projector is used as a ceiling mount and is turned upside down and left and right as viewed from the viewer, the inverted image is projected upside down and left and right respectively. Therefore, a normal image can be displayed when viewed from the viewer.
Further, when such an inverted image is projected, the audio signal switching section is set to the second switching state, so that the audio is also horizontally inverted in accordance with the inverted image, and the audio is horizontally inverted with respect to the image. Since there is no need to do this, the viewer does not feel uncomfortable.

In the projector of the present invention, an image processing system capable of selectively switching and projecting a normal image as the image and an inverted image obtained by inverting the normal image left and right, and controlling the audio signal switching unit. When the image processing system projects the normal image, the audio signal switching unit is set to the first switching state, and when the image processing system projects the inverted image, the audio signal switching is performed. A control unit for setting the unit to the second switching state.

With this configuration, even if the projector is used for rear projection and the viewer turns left and right when viewed from the viewer, it is possible to project a reversed image whose right and left are reversed. , A normal image can be displayed. Further, when the inverted image is projected, the audio signal switching unit is set to the second switching state, so that the audio is also horizontally inverted, and the audio is not horizontally inverted with respect to the image. Does not give a sense of discomfort.

In the projector according to the present invention, an image processing system capable of selectively switching and projecting a normal image and an inverted image obtained by inverting the normal image as the image and controlling the audio signal switching unit. When the image processing system projects the normal image, the audio signal switching unit is set to the first switching state, and when the image processing system projects the inverted image, the audio signal switching is performed. A control unit for setting the unit to the first switching state.

For example, when the projector is mounted on a ceiling and used in rear projection, the projector is turned upside down as viewed from the viewer, but not upside down. Therefore, in this case, it is not necessary to project an image that is inverted only up and down, and to invert the sound horizontally. Therefore, by adopting the above-described configuration, even when the projector is ceiling-mounted and used in rear projection, as viewed from the viewer,
Since a normal image can be displayed and the audio signal switching unit is set to the first switching state, the audio is not inverted left and right, so that the left and right of the image and the audio coincide with each other. Does not give a sense of discomfort.

The projector according to the present invention may further include a right channel audio output terminal and a left channel audio output terminal, and the right channel obtained from the stereo audio signal source regardless of a switching state of the audio signal switching unit. Preferably, the audio signal is guided to the right channel audio output terminal, and the left channel audio signal is guided to the left channel audio output terminal.

External stereo speakers are usually connected to the right and left channel audio output terminals. The external stereo speakers are separate from the projector, and can be arranged regardless of the arrangement state of the projector. Therefore, even when the projector is used for ceiling or rear projection, and the projector is at least left and right as viewed from the viewer, the external stereo speakers are arranged so that the left and right thereof match the left and right of the viewer, that is, the external The right channel speaker can be arranged on the right side as viewed from the viewer, and the external left channel speaker can be arranged on the left side as viewed from the viewer.

Therefore, as described above, by arranging the right channel audio signal to the right channel audio output terminal and the left channel audio signal to the left channel audio output terminal, regardless of the arrangement state of the projector, The external stereo speakers output the right channel sound from the external right channel speaker arranged on the right side, and the left channel audio from the external left channel speaker arranged on the left side. , Can provide the correct voice.

An audio output method according to the present invention is an audio output method for outputting audio from a stereo speaker mounted inside or outside a projector, and is used in a state where the projector is suspended upside down. Alternatively, when the image is used in a state where the image is projected from the back of the screen, the gist is that the sound output from the stereo speaker is inverted left and right and output.

By executing such a method, of the stereo speakers built into the projector, the right channel audio is heard from the speaker arranged on the right side as viewed from the viewer, and the left channel audio is heard from the viewer. The sound can be heard from the speaker arranged on the left side, and the sound does not reverse left and right with respect to the image, and the viewer does not feel discomfort.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples. Such description will be made in the order of the following items. A. Configuration of Projector: Operation of projector: B-1. Operation on desktop: B-2. Operation at ceiling mount: B-3. Operation in rear projection: B-4. Operation in ceiling / rear projection: Modification: C-1. Modification Example 1: C-2. Modification Example 2: C-3. Modification 3 C-4. Modification Example 4: C-5. Modification 5:

A. Configuration of Projector: FIG. 1 is a block diagram showing the configuration of a projector as one embodiment of the present invention.

As shown in FIG. 1, the projector 100 of this embodiment is roughly divided into an audio processing system, an image processing system, and an operation / control system. Audio input terminals Rin and Lin for inputting an external audio signal, and an analog switch 1 for switching the output destination of the audio signal, which is a characteristic part of the present invention.
02, 104 and an amplifier 10 for amplifying an audio signal
6, 108, 110, and 112, stereo speakers RSP and LSP as built-in speakers, and audio output terminals Rout and Lout for outputting audio signals to the outside.

Although the stereo speakers RSP and LSP, which are built-in speakers, are mounted inside the housing of the projector 100, they may be mounted outside the housing.

The image processing system includes an illumination optical system 132 for outputting illumination light, a liquid crystal light valve 134 for forming image light, a projection optical system 136 for projecting image light, and an external An image input terminal Vin for inputting an image signal from the CPU, an image processing unit 140 for processing the image signal, a liquid crystal drive circuit 142 for driving a liquid crystal light valve 134 based on the processed image signal,
It has.

The operation / control system includes a microcomputer unit (hereinafter, MCU) for controlling the analog switches 102 and 104, the liquid crystal light valve 134, and the like.
) 130 and a remote controller (hereinafter abbreviated as “remote control”) 1 for operating the projector from outside
26 and a signal from the remote controller 126 to process the MCU
And a remote control signal processor 128 for transmitting the signal to the remote controller 130.

B. Operation of Projector: As described above, the projector has three usage modes, such as tabletop, ceiling (ceiling), and rear projection. For each of the usage modes, the operation of the projector 100 according to the present embodiment will be described. This will be described below.

B-1. Operation on Desk: FIG. 2 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used on a desk.

When the projector 100 is used on a desk, first, as shown in FIG. 2, the installer places the projector 100 on a desk (not shown) or the like, and externally serves as an image / audio signal source such as a DVD player. 200. Then, when the operator operates the remote controller 126 to instruct the “desktop mode”, the instruction is transmitted from the remote controller 126 to the remote controller signal processing unit 128 as a remote control signal. Remote control signal processing section 128 analyzes the transmitted remote control signal and outputs the instruction content to MCU 130. When the MCU 130 recognizes that the “desktop mode” has been selected from the input instruction content, the MCU 130 instructs the liquid crystal drive circuit 142 to perform “normal display”, and instructs the analog switches 102 and 104 to both the “a” side. Is controlled to switch to.

Thereafter, when the reproduction by the DVD player 200 is started, the image input terminal Vi of the projector 100
n, an image signal is input from the DVD player 200, a right channel audio signal is input to a right channel audio input terminal Rin, and a left channel audio signal is input to a left channel audio input terminal Lin. Is done.

The input image signal is supplied to an image processing unit 140
Is subjected to a predetermined process, and is input to the liquid crystal drive circuit 142. The liquid crystal drive circuit 142 drives the liquid crystal light valve 134 based on the input image signal. At this time, the liquid crystal drive circuit 142 drives the liquid crystal light valve 134 in accordance with the above-described “normal display” instruction from the MCU 130 so that a normal image is projected.

The liquid crystal light valve 134 includes the illumination optical system 1
Since the light is almost uniformly illuminated by 32, when driven as described above, the image light is formed by the driving, and the formed image light is projected on the screen by the projection optical system 136. A normal image is displayed as shown in FIG.

On the other hand, the analog switches 102 and 104
Are switched to the “a” side under the control of the MCU 130, the right channel audio signal input from the audio input terminal Rin is supplied to the analog switch 1
02, and is input to the right channel speaker RSP via the amplifier 106. Further, the left channel audio signal input from the audio input terminal Lin passes through the analog switch 104 and is input to the left channel speaker LSP via the amplifier 108. Therefore, as shown in FIG.
Right channel audio is output from the right channel speaker RSP, and left channel audio is output from the left channel speaker LSP.

In FIG. 2, the audio output terminals Rout,
Nothing is connected to Lout, but as an external stereo speaker, a right channel audio output terminal Rout
If the external right channel speaker is connected to the left channel audio output terminal Lout and the external left channel speaker is connected to the left channel audio signal, the right channel audio signal input from the audio input terminal Rin is transmitted through the amplifier 110. The left channel audio signal output from the right channel audio output terminal Rout, input to the external right channel speaker, and input from the audio input terminal Lin is output via the amplifier 112 to the left channel audio output terminal Lo.
ut and output to the external left channel speaker. As a result, from the external right channel speaker,
The right channel audio is output, and the left channel audio is also output from the external left channel speaker.

B-2. Operation at Ceiling: FIG. 3 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used as a ceiling.

When using a ceiling mount, first, the installer
As shown in FIG. 3, the projector 100 is installed upside down so as to be suspended from a ceiling (not shown) or the like.
For example, a DVD player 200 is connected. Moreover,
When the operator operates the remote controller 126 to instruct “ceiling mode (ceiling) mode”, the instruction is transmitted to the remote control signal processing unit 128 as a remote control signal, and the remote control signal processing unit 128 analyzes the remote control signal. Then, the instruction content is output to the MCU 130. MCU130
When recognizing that the “ceiling mode” has been selected from the input instruction content, it instructs the liquid crystal drive circuit 142 to perform “vertical inversion / horizontal inversion display”, and instructs the analog switches 102 and 104 to Is also switched to the b side.

When the reproduction by the DVD player 200 is started, similarly to the case of the “desktop mode”, an image signal is input from the DVD player 200 to the image input terminal Vin of the projector 100, and A right channel audio signal is input to the right channel audio input terminal Rin, and a left channel audio signal is input to the left channel audio input terminal Lin.

The input image signal is sent to the image processing unit 140
Is input to the liquid crystal drive circuit 142 via the liquid crystal light valve 1 based on the image signal.
34 is driven. At this time, the liquid crystal driving circuit 142
The liquid crystal light valve 134 is driven according to the above-described instruction of “vertical / vertical / horizontal display” input from the CU 130 so that an image obtained by inverting a normal image in the vertical and horizontal directions is projected.

As a result, when the image light formed by the liquid crystal light valve 134 is projected on the screen,
As shown in FIG. 3, when viewed from the projector 100 which is suspended upside down from the ceiling, the image is upside down and left and right, but as viewed from the viewer, a normal image is displayed on the screen.

On the other hand, the analog switches 102 and 104
Are controlled by the MCU 130 described above.
Since the switch is switched to the side b opposite to that in the “desktop mode”, the right channel audio signal input from the audio input terminal Rin is
Through the left channel speaker L via the amplifier 108.
Input to SP. The left channel audio signal input from the audio input terminal Lin passes through the analog switch 102 and is input to the right channel speaker RSP via the amplifier 106. Therefore, in the case of the “ceiling mode”, as shown in FIG.
SP outputs left channel audio, and left channel speaker LSP outputs right channel audio.

At this time, since the projector 100 is suspended from the ceiling upside down as described above,
From the viewer's point of view, the top and bottom are opposite and the left and right are also opposite. The right channel speaker RSP is located on the left side when viewed from the viewer, and the left channel speaker LSP is located on the right side. Therefore, for the viewer, the sound to be heard from the right side (the sound of the right channel) is heard from the speaker LSP arranged on the right side, and the sound to be heard from the left side (the sound of the left channel) for the image being viewed. Can be heard from the speaker RSP arranged on the left side. Therefore, since the sound does not reverse left and right with respect to the image, the viewer can hear the sound without feeling uncomfortable.

Also in FIG. 3, the audio output terminals Rout,
Nothing is connected to Lout, but it is assumed that the audio output terminal R of the right channel is used as an external stereo speaker.
out, the external right channel speaker is connected to the left channel audio output terminal Lout, and the external left channel speaker is connected to the audio input terminal R.
The right-channel audio signal input from the output terminal Rout is output from the right-channel audio output terminal Rout via the amplifier 110 and input to the external right-channel speaker, as in the case of the “desktop mode”. Terminal Li
n from the amplifier 11
2, the audio signal is output from the left channel audio output terminal Lout and input to an external left channel speaker.
As a result, the right channel audio is output from the external right channel speaker, and the left channel audio is output from the external left channel speaker.

The external stereo speakers are the projector 1
Since it is separate from 00, it can be arranged regardless of the arrangement state of the projector. Therefore, even if the projector 100 is hung upside down from the ceiling and turned upside down and left and right, the external stereo speakers will be adjusted so that the left and right coincide with the viewer's left and right, ie, the external right channel. The speaker can be arranged on the right side as viewed from the viewer, and the external left channel speaker can be arranged on the left side as viewed from the viewer.

Therefore, even when such an external stereo speaker is installed, the right channel audio for the viewer is not transmitted from the external right channel speaker arranged on the right side to the left channel audio for the image being viewed. Can be heard from the external left channel speaker arranged on the left side, and the viewer can hear the sound without any problem without reversing left and right with respect to the image and the sound from the built-in stereo speaker.

B-3. Operation in rear projection: FIG. 4 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used for rear projection.

For use in rear projection, first, as shown in FIG. 4, the installer places the projector 100 behind the transmissive screen 300 and sets the projector 100 outside the projector 100 as an image / audio signal source, for example. , A DVD player 200 is connected. Then, when the operator operates the remote controller 126 and instructs the “rear projection mode”,
The instruction is transmitted to the remote control signal processing unit 128, and the remote control signal processing unit 128
Tell When the MCU 130 recognizes that the “rear projection mode” has been selected from the instruction content, the MCU 130 instructs the liquid crystal drive circuit 142 to perform “horizontal inversion display” and instructs the analog switches 102 and 104 to “ceiling mode”. In the same way as in the case of, control is performed so that both switches to the b side.

When the reproduction by the DVD player 200 is started, the image input terminal Vi of the projector 100
n is an audio signal input terminal Rin of the right channel.
To the right channel audio signal, and the left channel audio signal to the left channel audio input terminal Lin.

The input image signal is sent to the image processing unit 140
Is input to the liquid crystal drive circuit 142 via the liquid crystal light valve 1 based on the image signal.
34 is driven. At this time, the liquid crystal driving circuit 142
The liquid crystal light valve 134 is driven according to the instruction of “horizontal display” input from the CU 130 such that an image obtained by inverting only the left and right of the normal image is projected.

Thus, when the image light formed by the liquid crystal light valve 134 is projected on the transmissive screen 300, the image is a left-right inverted image when viewed from the projector 100 disposed behind the transmissive screen 300. However, when viewed from a viewer in front of the transmissive screen 300, a normal image is displayed on the transmissive screen 300 as shown in FIG.

On the other hand, the analog switches 102 and 104
Are switched to the b side under the control of the MCU 130, so that the right channel audio signal input from the audio input terminal Rin is transmitted from the analog switch 104 to the amplifier 10
8 to the left channel speaker LSP.
The left channel audio signal input from the audio input terminal Lin is supplied from the analog switch 102 to the amplifier 106.
Via the right channel speaker RSP. Therefore, in the case of the "rear projection mode",
As in the case of, from the right channel speaker RSP,
As shown in FIG. 4, the left channel audio is output, and the right channel audio is output from the left channel speaker LSP.

As described above, the projector 100
Since it is behind the transmissive screen 300, the left and right sides are reversed from a viewer in front of the transmissive screen 300, so that the right channel speaker RS
P is arranged on the left side as viewed from the viewer, and the left channel speaker LSP is arranged on the right side. Therefore, the sound is output as described above, so that the viewer can hear the sound to be heard from the right side (the sound of the right channel) from the speaker LSP arranged on the right side with respect to the image being viewed. The sound to be heard from the left side (the sound of the left channel) is heard from the speaker RSP arranged on the left side. Therefore, also in this case, the sound does not reverse left and right with respect to the image, and the viewer can hear the sound without feeling uncomfortable.

Also in FIG. 4, the audio output terminals Rout,
Nothing is connected to Lout, but it is assumed that an external right channel speaker is connected to the right channel audio output terminal Rout, and an external left channel speaker is connected to the left channel audio output terminal Lout. Also, the right channel audio signal input from the audio input terminal Rin is “desktop mode”, “ceiling mode”
As in the case of the above, the left channel audio signal output from the right channel audio output terminal Rout via the amplifier 110 and input to the external right channel speaker, and input from the audio input terminal Lin via the amplifier 112 The audio signal is output from the left channel audio output terminal Lout and input to an external left channel speaker. As a result, the right channel audio is output from the external right channel speaker, and the left channel audio is output from the external left channel speaker.

In the "rear projection mode", the external stereo speakers are separate from the projector 100, and can be placed regardless of the arrangement state of the projector. Therefore, even if the projector 100 is arranged behind the transmissive screen 300 so that the left and right of the viewer are opposite to each other, the external stereo speakers are arranged so that the left and right thereof coincide with the left and right of the viewer. That is, the external right channel speaker can be arranged on the right side as viewed from the viewer, and the external left channel speaker can be arranged on the left side as viewed from the viewer.

Therefore, for the viewer, the right channel audio is output from the external right channel speaker arranged on the right side, and the left channel audio is output from the external left channel speaker arranged on the left side with respect to the image being viewed. Therefore, the viewer can hear the sound without any problem without reversing left and right with respect to the image and the sound from the built-in stereo speaker.

B-4. Operation in ceiling / rear projection: As described above, there are three usage modes of the projector, such as a tabletop, a ceiling (ceiling), and a rear projection. It is also conceivable to use it for ceiling mount and rear projection.

When used for ceiling mount and rear projection,
First, the installer suspends the projector 100 upside down from a ceiling (not shown) or the like, and installs the projector 100 behind the transmissive screen 300, outside the projector 100 as an image / audio signal source. For example, a DVD player 200 is connected. Then, when the operator operates the remote controller 126 and instructs the “ceiling / rear projection mode”, the instruction is transmitted to the remote controller signal processor 128 as a remote controller signal, and the remote controller signal processor 128 The remote control signal is analyzed, and the content of the instruction is output to the MCU 130. When the MCU 130 recognizes that the “ceiling / rear projection mode” has been selected from the input instruction content, the MCU 130 instructs the liquid crystal drive circuit 142 to perform “vertical display”, and also issues an instruction to the analog switches 102 and 104. Both switches to the a side,
Control.

When the reproduction by the DVD player 200 is started, the image input terminal Vi of the projector 100
n, an image signal is input from the DVD player 200, a right channel audio signal is input to a right channel audio input terminal Rin, and a left channel audio signal is input to a left channel audio input terminal Lin. Is done.

The input image signal is sent to the image processing unit 140
Is input to the liquid crystal drive circuit 142 via the liquid crystal light valve 1 based on the image signal.
34 is driven. At this time, the liquid crystal driving circuit 142
The liquid crystal light valve 134 is driven in accordance with the above-described “vertical display” input from the CU 130 so that an image obtained by inverting only a normal image upside down is projected.

At this time, as described above, since the projector 100 is suspended from the ceiling upside down and disposed behind the transmissive screen 300, only the top and bottom are inverted from the viewpoint of the viewer. I have. Therefore,
When the image light formed by the liquid crystal light valve 134 driven as described above is projected on the screen, the image is inverted upside down when viewed from the projector 100, but a normal image is viewed from the viewer. Displayed on the screen.

On the other hand, the analog switches 102 and 104
Are controlled by the MCU 130 described above.
Since the switch is switched to the side a as in the “desktop mode”, the right channel audio signal input from the audio input terminal Rin passes through the analog switch 102 and is input to the right channel speaker RSP via the amplifier 106. Is done. Further, the left channel audio signal input from the audio input terminal Lin passes through the analog switch 104,
The signal is input to the left channel speaker LSP via the amplifier 108. Therefore, the right channel speaker RSP outputs the right channel sound, and the left channel speaker LSP outputs the left channel sound.

As described above, the projector 100
From the viewer's perspective, only the top and bottom are opposite,
The right channel speaker RSP is arranged on the right side as viewed from the viewer, and the left channel speaker LSP is arranged on the left side, as in the “desktop mode”. Therefore,
For the viewer, the sound to be heard from the right side (the sound of the right channel) is heard from the speaker RSP arranged on the right side, and the sound to be heard from the left side (the sound of the left channel) is on the left side with respect to the image being viewed. It will be heard from the placed speaker LSP.

As an external stereo speaker, an external right channel speaker is connected to a right channel audio output terminal Lout, and a left channel audio output terminal Lout is connected to a left channel audio output terminal Lout.
If the external left channel speakers are connected, the right channel audio signal input from the audio input terminal Rin is output from the right channel audio output terminal Rout via the amplifier 110, and the external right channel speaker is output. And the left channel audio signal input from the audio input terminal Lin via the amplifier 112,
Output from the left channel audio output terminal Lout,
Input to the external left channel speaker. As a result, the right channel audio is output from the external right channel speaker, and the left channel audio is also output from the external left channel speaker.

C. Modifications: The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof.

C-1. Modified Example 1: In the embodiment described above,
The MCU 130 controls the analog switches 102 and 104 according to the mode instruction from the operator,
Although the output destination of the audio signal is switched, the present invention is not limited to this, and the analog switches 102 and 104 are operated by the operator operating buttons and knobs provided on the projector 100. May be switched directly.

C-2. Modification 2 In the above embodiment,
In the case of the “ceiling mode”, when the operator instructs the “ceiling mode”, the MCU 130 recognizes that the “ceiling mode” is selected, but the present invention is not limited to this. Instead of something inside projector 100,
For example, a gravity sensor, a posture sensor, and the like are provided, and when the projector 100 is placed upside down by the installer, the fact is detected by the sensor and the MCU is detected.
By transmitting the notification to the MCU 130, the MCU 130 may recognize that the “ceiling mode” is selected.

C-3. Modification 3 In the above-described embodiment,
Although the analog switch is used as the audio signal switching unit, a digital switch may be used. Alternatively, not only an electronic switch but also a mechanical switch may be used.

C-4. Modification 4: In the above embodiment,
Although the stereo audio signal and the image signal are input from the outside, the projector 100 itself may have a stereo audio signal source and an image signal source.

C-5. Modification 5: In the above embodiment,
By changing the driving method by the liquid crystal drive circuit 142, an image that is vertically inverted or horizontally inverted is generated, but such an image may be generated by image processing in the image processing unit 140, Such an image may be formed optically in the projection optical system 136 or the like.

C-6. Modification 6: In the above embodiment,
The projector 100 uses the liquid crystal light valve 134 as the electro-optical device, but may include a micromirror light modulator, a CRT, or the like instead. As a micromirror light modulation device, for example, D
An MD (digital micromirror device) (trademark of TI) can be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a projector as one embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used on a desk.

FIG. 3 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used as a ceiling mount.

FIG. 4 is an explanatory diagram for explaining a method of outputting sound when the projector 100 of FIG. 1 is used for rear projection.

[Explanation of symbols]

 Reference Signs List 100 Projector 102, 104 Analog switch 106, 108, 110, 112 Amplifier 126 Remote control 128 Remote control signal processing unit 130 MCU 132 Illumination optical system 134 Liquid crystal light valve 136 Projection optical system 140 Image processing unit 142 liquid crystal drive circuit 200 DVD player 300 transmissive screen LSP left channel speaker Lin left channel audio input terminal Lout left channel audio output terminal RSP right channel speaker Rin right channel audio input terminal Rout right channel audio Output terminal Vin: Image input terminal

Claims (6)

[Claims] 1. A projector capable of projecting an image, comprising: a stereo speaker having a right channel speaker and a left channel speaker mounted inside or outside the projector, and a right channel obtained from a stereo sound signal source. An audio signal and a left channel audio signal are input, and the output destination of the audio signal is selectively switched. In a first switching state, the right channel audio signal is transmitted to the right channel speaker, and the left channel audio signal is transmitted to the right channel speaker. An audio signal switching unit that respectively outputs the left channel audio signal to the left channel speaker and outputs the right channel audio signal to the left channel speaker and the left channel audio signal to the right channel speaker in the second switching state; Projector provided with. 2. The projector according to claim 1, wherein the image processing system is capable of selectively switching and projecting a normal image as the image and an inverted image obtained by inverting the normal image vertically and horizontally. When controlling the audio signal switching unit and the image processing system projects the normal image, the audio signal switching unit is set to the first switching state, and the image processing system projects the inverted image. A control unit that sets the audio signal switching unit to the second switching state. 3. The projector according to claim 1, wherein the image processing system is capable of selectively switching and projecting a normal image as the image and an inverted image obtained by inverting the left and right of the normal image, and the audio signal. Controlling the switching unit, when the image processing system projects the normal image, sets the audio signal switching unit to the first switching state, and when the image processing system projects the inverted image, A control unit that sets the audio signal switching unit to the second switching state. 4. The projector according to claim 1, wherein the image processing system is capable of selectively switching and projecting a normal image and an inverted image obtained by inverting the normal image as the image, and the audio signal. Controlling the switching unit, when the image processing system projects the normal image, sets the audio signal switching unit to the first switching state, and also when the image processing system projects the inverted image. A control unit that sets the audio signal switching unit to the first switching state. 5. The projector according to claim 1, further comprising a right channel audio output terminal and a left channel audio output terminal, wherein the audio signal switching unit is in a switching state. Regardless, the right channel audio signal obtained from the stereo audio signal source is guided to the right channel audio output terminal, and the left channel audio signal is guided to the left channel audio output terminal. . 6. An audio output method for outputting audio from a stereo speaker mounted inside or outside a projector, wherein the projector is used in a state where the projector is suspended upside down, or an image is output. A sound output method, wherein, when used in a state of projecting from the back of a screen, the sound output from the stereo speaker is inverted left and right and output.