JP2010073271A - Optical disk playback device, audio output device, projector, program, and information storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector or the like appropriately suppressing vibrations due to audio output. <P>SOLUTION: The projector 100 includes: an audio amplification part 150 for generating an amplified audio signal by amplifying an audio signal; an audio output part 152 for outputting an audio sound based on the amplified audio signal; a determination part 160 for determining whether a value based on the audio signal or the amplified audio signal satisfies a first vibration generation condition; an optical disk part 120 for reading information recorded in the optical disk; a vibration detection part 180 for detecting vibration of the optical disk part 120 to generate a vibration value based on the vibration; a determination part 162 for determining whether the vibration value satisfies a second vibration generation condition; and a control unit 170 for performing control so as to reduce the amplification degree of the audio signal by the audio amplification part 150 when the determination result of the determination part 160 is true and the determination result of the determination part 162 is true. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical disc playback device, an audio output device, a projector, a program, and an information storage medium.

  For example, in the case of an optical disk playback apparatus in which a DVD player and a liquid crystal display are integrated, the DVD player may be affected by the vibration of the built-in speaker, a tracking error may occur, and normal playback may not be performed.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 9-270135 describes that the presence or absence of audio information in the optical disc is determined, and if audio information is included, the gain of the servo amplifier is set high. Yes.
JP-A-9-270135

  However, in the method disclosed in Japanese Patent Laid-Open No. 9-270135, the amplification factor is changed even when the sound output level is low, and the responsiveness of the optical disk is lowered. Thereby, for example, when the user gives an instruction to reproduce the next chapter, the time until the reproduction is started becomes longer, and there is a problem that the operability of the user is lowered.

  In general, when the sound output level becomes too high, a so-called chatter sound (noise generated by touching an object due to vibration) is generated, making it difficult to hear the sound. In the case of a projector, the liquid crystal panel or the like may also vibrate due to the vibration of the built-in speaker, which may hinder normal projection of images.

  An object of the present invention is to provide an optical disc playback apparatus, an audio output apparatus, a projector, a program, and an information storage medium that can appropriately suppress vibrations associated with audio output.

  In order to solve the above problems, an optical disc reproducing apparatus according to the present invention includes an audio amplifying unit that amplifies an audio signal to generate an amplified audio signal, an audio output unit that outputs audio based on the amplified audio signal, and A first determination unit that determines whether a value based on an audio signal or the amplified audio signal satisfies a first vibration generation condition; an optical disc unit that reads recorded information recorded on an optical disc; and vibrations of the optical disc unit A vibration detection unit that detects and generates a vibration value based on the vibration, a second determination unit that determines whether or not the vibration value satisfies a second vibration generation condition, and a determination result by the first determination unit And a control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit when the determination result by the second determination unit is true.

  In addition, a projector according to the present invention functions as the optical disc reproducing apparatus.

  The program according to the present invention includes an audio amplifying unit that amplifies an audio signal to generate an amplified audio signal, an audio output unit that outputs audio based on the amplified audio signal, and recorded information recorded on an optical disc. A program readable by a computer of an optical disc playback apparatus, comprising: an optical disc unit to be read; and a vibration detection unit that detects vibrations of the optical disc unit and generates a vibration value based on the vibrations. A first determination unit that determines whether a signal or a value based on the amplified audio signal satisfies a first vibration generation condition; and a second determination unit that determines whether the vibration value satisfies a second vibration generation condition When the determination result by the determination unit and the first determination unit is true and the determination result by the second determination unit is true, the voice amplification unit Characterized in that to function as a control unit that performs control to reduce the amplification degree of the speech signal.

  An information storage medium according to the present invention stores the above program.

  According to the present invention, an optical disk playback device or the like also determines a vibration value of an optical disk unit in addition to a determination of a value based on an audio signal or an amplified audio signal, and reduces the amplification degree of the audio signal according to the determination result of both By doing so, it is possible to appropriately suppress vibration associated with sound output.

  An audio output device according to the present invention includes a housing, an audio amplifying unit that amplifies an audio signal to generate an amplified audio signal, an audio output unit that outputs audio based on the amplified audio signal, and the audio A first determination unit that determines whether a signal or a value based on the amplified audio signal satisfies a first vibration generation condition; and vibration detection that detects a vibration of the housing and generates a vibration value based on the vibration A second determination unit that determines whether the vibration value satisfies a second vibration generation condition, and the determination result by the first determination unit is true, and the second determination unit And a control unit that performs control to reduce the amplification degree of the audio signal by the audio amplifying unit when the determination result is true.

  In addition, a projector according to the present invention functions as the audio output device.

  Further, a program according to the present invention includes a housing, an audio amplifying unit that amplifies the audio signal to generate an amplified audio signal, an audio output unit that outputs audio based on the amplified audio signal, and A computer-readable program having a sound output device including a vibration detection unit that detects vibration and generates a vibration value based on the vibration, the computer being a value based on the sound signal or the amplified sound signal A first determination unit that determines whether or not the first vibration generation condition is satisfied, a second determination unit that determines whether or not the vibration value satisfies a second vibration generation condition, and the first determination When the determination result by the unit is true and the determination result by the second determination unit is true, it functions as a control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit. And wherein the Rukoto.

  An information storage medium according to the present invention stores the above program.

  According to the present invention, the audio output device or the like also determines the vibration value of the housing in addition to the determination of the value based on the audio signal or the amplified audio signal, and reduces the amplification degree of the audio signal according to the determination result of both By doing so, it is possible to appropriately suppress vibration associated with sound output.

  The vibration detection unit may detect an acceleration of at least one axis of the optical disc unit as the vibration value and generate a value indicating the acceleration.

  According to this, the projector or the like can perform vibration determination according to the acceleration.

  The first determination unit may determine that the first vibration generation condition is satisfied when an envelope of a value based on the amplified audio signal exceeds a first threshold.

  According to this, the projector or the like can determine the vibration according to the value based on the amplified audio signal.

  The second determination unit may determine that the second vibration generation condition is satisfied when an envelope of the value indicating the acceleration exceeds a second threshold.

  According to this, the projector or the like can perform vibration determination according to the acceleration.

  Embodiments in which the present invention is applied to a projector will be described below with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all the configurations shown in the following embodiments are not necessarily essential as means for solving the invention described in the claims.

(First embodiment)
First, a description will be given of a method for suppressing vibration accompanying sound output in a projector having a sound output function and incorporating a DVD player.

  FIG. 1 is a functional block diagram of a projector 100 in the first embodiment. The projector 100 includes an audio input unit 110 that inputs an audio signal from an external PC (Personal Computer), an optical disc unit 120 that reads recorded information recorded on the optical disc, and an audio signal extraction that extracts the audio signal from the recorded information. 112, an image signal extraction unit 132 that extracts an image signal from the recording information, an image input unit 130 that inputs an image signal from an external PC, and a selection unit 140 that selects an audio signal and an image signal. It is configured.

  The projector 100 also includes an audio amplifying unit 150 that amplifies the audio signal to generate an amplified audio signal, an audio output unit 152 that outputs audio based on the amplified audio signal, and a value based on the amplified audio signal is a first value. A determination unit (first determination unit) 160 that determines whether or not vibration generation conditions are satisfied, a vibration detection unit 180 that detects vibration of the optical disc unit 120 and generates a vibration value based on the vibration, and the vibration value is When the determination result by the determination unit (second determination unit) 162 that determines whether the second vibration generation condition is satisfied and the determination unit 160 is true and the determination result by the determination unit 162 is true A control unit 170 that performs control to reduce the amplification degree of the audio signal by the audio amplification unit 150, an image generation unit 142 that generates an image based on the image signal, and a projection unit 190 that projects the image. It is configured.

  For example, the following may be employed as hardware for implementing the functions of the control unit 170 and the like in the projector 100. For example, the audio input unit 110 is an audio input terminal, the image input unit 130 is an image input terminal, the audio signal extraction unit 112 and the image signal extraction unit 132 are digital signal processing circuits, and the optical disc unit 120 is a DVD player. The selection unit 140 is a selector, the audio amplification unit 150 is an amplifier, the audio output unit 152 is a speaker, the determination units 160 and 162, the control unit 170 is a CPU, and the image generation unit 142 is image processing. As the projection unit 190 such as a circuit, a lamp, a lamp driving circuit, a liquid crystal panel, a liquid crystal driving circuit, a lens, or the like may be employed.

  Further, the projector 100 may implement functions such as the control unit 170 by reading a program from the information storage medium 200. As such an information storage medium 200, for example, a CD-ROM, DVD-ROM, ROM, RAM, HDD, or the like can be applied.

  Next, an audio amplification control procedure using the control unit 170 and the like will be described. FIG. 2 is a flowchart showing the audio amplification control procedure in the first embodiment. FIG. 3 is a flowchart showing a vibration determination procedure in the first embodiment.

  Here, it is assumed that recorded information (for example, moving image information) recorded on the optical disc unit 120 is reproduced. Of course, an audio based on the audio signal from the audio input unit 110 or an image based on the image signal from the image input unit 130 may be reproduced. The audio signal extraction unit 112 extracts audio information from the recorded information recorded on the optical disc unit 120, and the selection unit 140 inputs the audio information (step S1).

  The audio amplifying unit 150 amplifies the audio information from the selection unit 140 and generates an amplified audio signal (step S2). The determination unit 160 generates a voltage envelope when the amplified audio signal is output (step S3).

  FIG. 4 is a diagram illustrating an example of a voltage when an amplified audio signal is output in the first embodiment. For example, in FIG. 4, a curve is a voltage waveform, a two-dot chain line is a + side envelope, and a broken line is a first threshold.

  The control unit 170 determines whether or not the envelope generated by the determination unit 160 exceeds the first threshold (step S4). Note that the first threshold may be, for example, about 80% of the maximum allowable value. For example, when the maximum voltage is 12.6 V (audio output 10 W / 8Ω), the first threshold may be 10 V.

  Further, as shown in FIG. 3, the determination of the vibration of the optical disc unit 120 is also performed independently of the determination of the audio signal. The vibration detection unit 180 detects the acceleration of the optical disc unit 120 and outputs a value indicating the acceleration in a voltage format. The determination unit 162 generates an envelope of the voltage (step S21), and determines whether the envelope has exceeded the second threshold (step S22).

  FIG. 5 is a diagram illustrating an example of the voltage of the acceleration sensor in the first embodiment. For example, in FIG. 4, the curve is a voltage waveform, the two-dot chain line is the + side envelope, and the broken line is the second threshold.

  Note that the second threshold may be, for example, about 80% of the maximum allowable value. For example, when the maximum voltage is 300 mV, the second threshold value may be 240 mV. Further, the determination unit 162 determines whether the second threshold is exceeded by determining whether the envelope on the − side as well as the − side has reached a second threshold (for example, less than −240 mV). May be. When the acceleration sensor of the vibration detection unit 180 has two or more axes, the determination unit 162 may determine that the second threshold value has been exceeded when at least one-axis acceleration exceeds the second threshold value.

  When the determination unit 162 determines that the second threshold value has been exceeded, the control unit 170 sets the vibration flag stored in the control unit 170 to ON (step S23), and exceeds the second threshold value. If it is determined that there is no vibration, the vibration flag is set to OFF (step S24).

  The projector 100 determines whether or not the process should be terminated by turning off the power (step S25). When the process is to be terminated, the series of processes (steps S21 to S25) is terminated, and when the process is to be continued, Continue the series of processes.

  When it determines with having exceeded the 1st threshold value by step S4, the control part 170 determines whether a vibration flag is ON (step S5). When the determination result is true, the control unit 170 decreases the amplification degree of the amplified sound signal (for example, decreases according to the voltage of the amplified sound signal, decreases according to the voltage of the acceleration, 10 regardless of these voltages). The audio amplifying unit 150 is controlled so as to reduce the% (step S6).

  On the other hand, when it determines with not having exceeded the 1st threshold value by step S4, the control part 170 determines whether a vibration flag is OFF (step S7). When the determination result is true, the control unit 170 determines whether or not a predetermined time (for example, 30 seconds) has elapsed since the amplification degree of the amplified audio signal was changed (step S8).

  When the determination result is true, the control unit 170 controls the audio amplifying unit 150 to slightly return the amplification degree of the amplified audio signal (for example, increase the signal intensity by 0.5 dB to 1 dB) (step S9). . In addition, when the determination result in any of steps S7 and S8 is false, the amplification degree of the audio amplifying unit 150 does not change.

  The projector 100 determines whether or not the process should be terminated by turning off the power (step S10). If the process is to be terminated, the series of processes (steps S1 to S10) is terminated, and if the process is to be continued, Continue the series of processes. When the power is off, the control unit 170 may return the amplification level of the audio amplification unit 150 to the initial value.

  As described above, according to the present embodiment, the projector 100 determines the acceleration of the optical disc unit 120 in addition to the determination of the value based on the amplified audio signal, and increases the amplification degree of the audio signal according to the determination result of both. By reducing the vibration, vibration associated with sound output can be appropriately suppressed.

  Accordingly, since the projector 100 can reduce the vibration of the optical disc unit 120 and the like, it is possible to reduce the occurrence of an error in reading recorded information, sound skipping, and the like in the optical disc unit 120.

  Further, according to the present embodiment, the projector 100 determines not only the value based on the amplified audio signal but also the vibration, so that individual differences of the projector 100 (for example, differences in parts, screw tightening conditions, etc.) can be obtained. An accurate determination can be made regardless of the difference in vibration due to the difference. In addition, the projector 100 can perform the determination with a lower load than the case where the determination is made based on the frequency spectrum analysis or the like by performing the determination based on the voltage envelope of the amplified audio signal.

  Further, for example, when the optical disc unit 120 vibrates due to a person hitting the projector 100, even if the determination result of the determination unit 162 becomes true, if the determination result of the determination unit 160 is false, the amplification of the audio amplification unit 150 Since the degree does not change, the projector 100 does not need to change the volume by mistake.

(Second embodiment)
Next, a description will be given of a method for suppressing vibration accompanying sound output in a projector having a sound output function and not incorporating a DVD player.

  FIG. 6 is a functional block diagram of the projector 101 in the second embodiment. The projector 101 that functions as an audio output device has the same configuration as the projector 100 of the first embodiment, but does not include the optical disc unit 120, the audio signal extraction unit 112, and the image signal extraction unit 132. The vibration detection unit 181 is different from the projector 100 in that the vibration of the housing is detected.

  The casing is a case outside the projector 101. Similarly to the projector 100, the projector 101 may read the program stored in the information storage medium 201 and implement functions such as the control unit 170.

  The main difference from the first embodiment is only the point that the vibration detection unit 181 detects the vibration, and therefore the detailed description is omitted. In the second embodiment, the control unit 170 outputs a voltage exceeding the first threshold when the amplified audio signal is output, and a voltage indicating acceleration exceeds the second threshold due to vibration of the housing of the projector 101. In this case, the amplification degree of the audio amplification unit 150 is reduced.

  As described above, according to the second embodiment, the projector 101 can achieve the same operational effects as those of the first embodiment.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A various deformation | transformation is possible. For example, the value to be determined for the first vibration generation condition is not limited to a value based on the amplified audio signal, and may be a value based on the audio signal before amplification. The value is not limited to an analog value such as a voltage, and may be a digital value. Further, the first vibration generation condition determination method is not limited to the method using an envelope, and may be, for example, an average value, a maximum value, or the like of a digitally amplified audio signal.

  Further, the value to be determined for the second vibration generation condition is not limited to a value based on acceleration, and may be a value detected by a gyro. The value is not limited to an analog value such as a voltage, and may be a digital value. The determination method of the second vibration generation condition is not limited to the method using an envelope, and may be, for example, an average value or a maximum value of digital values indicating vibration.

  The acceleration detected by the vibration detection units 180 and 181 may be at least one-axis acceleration, and may be two-axis or three-axis acceleration.

  Further, the optical disc playback apparatus is not limited to the projector 100, and may be, for example, a CD component, a portable DVD player, a PC with a built-in DVD player, or the like. The audio output device is not limited to the projector 100, and may be a speaker with a built-in amplifier, for example. Note that the selection unit 140, the image input unit 130, the image generation unit 142, and the projection unit 190 are not essential, and the present invention can be applied to an apparatus having no image display function.

  Further, the projectors 100 and 101 are not limited to liquid crystal projectors (transmission type, reflection type such as LCOS), and may be projectors using DMD (Digital Micromirror Device), for example. DMD is a trademark of Texas Instruments Incorporated. Further, the functions of the projectors 100 and 101 may be distributed and implemented in a plurality of devices (for example, a PC and a projector).

It is a functional block diagram of the projector in a 1st Example. It is a flowchart which shows the audio | voice amplification control procedure in a 1st Example. It is a flowchart which shows the vibration determination procedure in a 1st Example. It is a figure which shows an example of the voltage at the time of the output of the amplified audio | voice signal in a 1st Example. It is a figure which shows an example of the voltage of the acceleration sensor in a 1st Example. It is a functional block diagram of the projector in a 2nd Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Projector (optical disk reproduction apparatus), 101 Projector (audio | voice output apparatus, housing | casing), 110 Audio | voice input part, 112 Audio | voice signal extraction part, 120 Optical disk part, 130 Image input part, 132 Image signal extraction part, 140 Selection part, 142 Image generation unit, 150 audio amplification unit, 152 audio output unit, 160 determination unit (first determination unit), 162 determination unit (second determination unit), 170 control unit, 180, 181 vibration detection unit, 190 projection unit , 200, 201 Information storage medium

Claims (10)

An audio amplifying unit for amplifying the audio signal to generate an amplified audio signal;
An audio output unit for outputting audio based on the amplified audio signal;
A first determination unit that determines whether a value based on the audio signal or the amplified audio signal satisfies a first vibration generation condition;
An optical disc unit for reading recorded information recorded on the optical disc;
A vibration detection unit that detects vibration of the optical disc unit and generates a vibration value based on the vibration;
A second determination unit that determines whether the vibration value satisfies a second vibration generation condition;
A control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit when the determination result by the first determination unit is true and the determination result by the second determination unit is true When,
including,
Optical disk playback device. The optical disk reproducing apparatus according to claim 1,
The vibration detection unit detects an acceleration of at least one axis of the optical disc unit as the vibration value and generates a value indicating the acceleration.
Optical disk playback device. The optical disk reproducing apparatus according to claim 2, wherein
The first determination unit determines that the first vibration generation condition is satisfied when an envelope of a value based on the amplified audio signal exceeds a first threshold;
Optical disk playback device. The optical disk reproducing apparatus according to any one of claims 2 and 3,
The second determination unit determines that the second vibration generation condition is satisfied when an envelope of the value indicating the acceleration exceeds a second threshold;
Optical disk playback device. The optical disk reproducing apparatus according to claim 1,
The first determination unit determines that the first vibration generation condition is satisfied when an envelope of a value based on the amplified audio signal exceeds a first threshold;
Optical disk playback device. A housing,
An audio amplifying unit for amplifying the audio signal to generate an amplified audio signal;
An audio output unit for outputting audio based on the amplified audio signal;
A first determination unit that determines whether a value based on the audio signal or the amplified audio signal satisfies a first vibration generation condition;
A vibration detector that detects vibration of the housing and generates a vibration value based on the vibration;
A second determination unit that determines whether the vibration value satisfies a second vibration generation condition;
A control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit when the determination result by the first determination unit is true and the determination result by the second determination unit is true When,
including,
Audio output device. It functions as an optical disk reproducing device according to any one of claims 1 to 5 or an audio output device according to claim 6.
projector. An audio amplifier that amplifies the audio signal to generate an amplified audio signal; an audio output unit that outputs audio based on the amplified audio signal; an optical disc unit that reads recorded information recorded on the optical disc; and A program readable by a computer of an optical disc reproducing apparatus including a vibration detection unit that detects vibration and generates a vibration value based on the vibration,
The computer,
A first determination unit that determines whether a value based on the audio signal or the amplified audio signal satisfies a first vibration generation condition;
A second determination unit that determines whether the vibration value satisfies a second vibration generation condition;
A control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit when the determination result by the first determination unit is true and the determination result by the second determination unit is true Function as
program. A case, a sound amplifying unit for amplifying the sound signal to generate an amplified sound signal, a sound output unit for outputting sound based on the amplified sound signal, and detecting vibration of the case and based on the vibration A computer-readable program having an audio output device including a vibration detection unit that generates a vibration value,
The computer,
A first determination unit that determines whether a value based on the audio signal or the amplified audio signal satisfies a first vibration generation condition;
A second determination unit that determines whether the vibration value satisfies a second vibration generation condition;
A control unit that performs control to reduce the amplification degree of the audio signal by the audio amplification unit when the determination result by the first determination unit is true and the determination result by the second determination unit is true Function as
program. A program according to any one of claims 8 and 9 is stored,
Information storage medium.

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