JP4214546B2 - AV system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an AV (Audio Visual) system, and is particularly suitable for use in an AV system including a plurality of speakers in a vehicle.
[0002]
[Prior art]
Conventionally, an AV system (hereinafter referred to as this specification) in which a display is installed on the rear seat of the vehicle (the back side of the front seat, etc.) and an AV source such as a TV or DVD is played to allow passengers in the rear seat to enjoy it. (Referred to as “Rear Entertainment System”). In this rear entertainment system, one small speaker is mounted on the display, and the sound of the AV source being reproduced is output from the mounted speaker.
[0003]
This rear entertainment system is configured to include the above-described display installed in a rear seat and a head unit installed in a console or the like. In addition to the rear seat display, the head unit centrally controls the front seat front speakers and various AV devices. The display on the rear seat is connected to the head unit, and the user can select and reproduce a desired AV source by operating the operation unit of the head unit or the remote controller. When there are a plurality of displays in the rear seat, it is possible to select and play back different AV sources in each.
[0004]
[Problems to be solved by the invention]
However, in the conventional rear entertainment system, one display has only one speaker and can output only monaural sound. For this reason, there is a problem that even when reproducing an AV source recorded in stereo, only L + R monaural sound can be output, and stereo sound cannot be output.
[0005]
The present invention has been made to solve such problems, and enables realization of sound field effects such as stereo sound and surround sound in a rear entertainment system having at least a speaker in a vehicle. For the purpose.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the AV system of the present invention detects whether or not a single source is being played, and outputs to a plurality of speakers provided in the vehicle according to the detection result. Control audio signals. For example, when single-source playback is detected, the single-source audio signal is divided into multiple systems (eg, L channel and R channel) and output from multiple speakers, and multiple source playback is detected. Then, control is performed so that the audio signals of the plurality of sources are output from a plurality of speakers as single system (for example, L + R channel) sounds.
[0007]
According to the present invention configured as described above, for example, when two speakers are provided on the left and right of the rear seat, when playing different sources, monaural sound of each source is output from the left and right speakers, respectively. Is done. On the other hand, when playing a single source, L channel sound is output from the left speaker, and R channel sound is output from the right speaker, so that stereo sound can be played back. It becomes.
[0008]
In addition, when three speakers are provided on the left, right, and center of the rear seat, when playing a single source, for example, the left speaker to the L channel, the right speaker to the R channel, and the center speaker. It is possible to output sound having a surround effect by controlling so as to output the sound of the L + R channel from. Further, it is possible to obtain a more complicated surround effect by applying filter processing, delay processing, or both to the plurality of audio signals.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a main part of the AV system according to the present embodiment. In FIG. 1, 1 is a radio tuner that receives and plays back AM / FM broadcasts, 2 is a TV tuner that receives and plays back TV broadcasts, 3 is a CD player that plays CDs (compact discs), and 4 is DVD (digital). This is a DVD player that plays back a video disc.
[0010]
21 is a left and right front speaker provided near the front seat of the vehicle, 22 is an L rear display provided on the left side of the rear seat (the back side of the left front seat), and 23 is a right side of the rear seat (the back side of the right front seat). It is R rear display provided in. The L rear display 22 includes a speaker 22a that outputs sound and a monitor unit 22b that displays video. Similarly, the R rear display 23 includes a speaker 23a for outputting sound and a monitor unit 23b for displaying video.
[0011]
Reference numeral 10 denotes a head unit which is connected to various AV devices such as a radio tuner 1, a television tuner 2, a CD player 3 and a DVD player 4 via a source signal input terminal 5, and from these AV devices, an audio source signal and video are sent. Input source signal. When the audio source signal corresponds to stereo audio, the audio source signal is composed of an L channel audio signal and an R channel audio signal.
[0012]
The head unit 10 is connected to the front speaker 21, the L rear display 22, and the R rear display 23 via the signal output terminal 25, and the audio signal selected and processed in the head unit 10 as will be described later. And output video signals.
[0013]
In the internal configuration of the head unit 10, reference numeral 11 denotes a front speaker selector, which includes an audio source selector 11a. The audio source selector 11a receives various audio source signals of AM, FM, TV, CD, and DVD, and selects and outputs one of the audio source signals according to the control of the controller 15 described later. The audio source signal selected by the audio source selector 11a is output from the front speaker 21.
[0014]
An L rear display selector 12 includes an audio source selector 12a and a video source selector 12b. The audio source selector 12a receives various audio source signals of AM, FM, TV, CD, and DVD, and selects and outputs one of the audio source signals according to the control of the controller 15 described later. The video source selector 12b receives various video source signals for TV and DVD, selects one of the video source signals according to the control of the controller 15 described later, and outputs it. The audio source signal and the video source signal selected here are of the same type.
[0015]
Reference numeral 13 denotes an R rear display selector, which includes an audio source selector 13a and a video source selector 13b. The audio source selector 13a receives various audio source signals of AM, FM, TV, CD, and DVD, and selects and outputs any audio source signal according to the control of the controller 15 described later. The video source selector 13b receives various video source signals of TV and DVD, selects one of the video source signals according to the control of the controller 15 described later, and outputs it. The audio source signal and the video source signal selected here are of the same type.
[0016]
The video source signal selected by the video source selector 12b for the L rear display described above is output to the L rear display 22 and displayed on the monitor unit 22b. Further, the video source signal selected by the video source selector 13b for the R rear display is output to the R rear display 23 and displayed on the monitor unit 23b.
[0017]
An operation unit 14 includes operation keys for performing various operations related to the head unit 10. For example, a power key for turning on / off the power, a source selection key for selecting an input source signal, and the like are provided. The controller 15 controls the front speaker selector 11, the L rear display selector 12, and the R rear display selector 13 so as to select the source signal selected by operating the source selection key. At this time, each of the selectors 11 to 13 can independently select an arbitrary source signal.
[0018]
Reference numeral 16 denotes an audio processing unit for the L rear display. The audio source signal selected by the audio source selector 12a for the L rear display according to the control of the controller 15 is a reproduction source in each of the rear displays 22 and 23. Predetermined signal processing is performed so as to obtain a sound field (monaural sound, stereo sound, or the like) according to the difference.
[0019]
Reference numeral 17 denotes an R rear display audio processing unit, which is a reproduction source in each of the rear displays 22 and 23 for the audio source signal selected by the R rear display audio source selector 13a according to the control of the controller 15. Predetermined signal processing is performed so as to obtain a sound field (monaural sound, stereo sound, or the like) according to the difference.
[0020]
That is, the controller 15 detects whether or not the same AV source is being reproduced on the L rear display 22 and the R rear display 23. This can be determined by checking which AV source is selected in each of the rear display selectors 13 and 14 by operating the operation unit 14. Then, the controller 15 controls the sound processing units 16 and 17 according to the detection result.
[0021]
Specifically, when the same AV source is being reproduced on both rear displays 22 and 23, the controller 15 controls each of the audio processing units 16 and 17 so that the speakers 22a of the L rear display 22 can transmit L. The channel audio signal is output, and the R channel audio signal is output from the speaker 23 a of the R rear display 23. Thereby, stereo sound can be output from the left and right speakers 22a and 23a with respect to the AV source being reproduced.
[0022]
On the other hand, when different AV sources are being reproduced on the rear displays 22 and 23, the controller 15 controls the audio processing units 16 and 17, and the speaker 22a of the L rear display 22 and the R rear display 23 are controlled. The audio signal of each AV source is output as L + R monaural sound from both of the speakers 23a. That is, monaural sounds of different AV sources are independently output from the left and right speakers 22a and 23a.
[0023]
FIG. 2 is a diagram collectively showing the above-described operations. As shown in FIG. 2, in the AV system according to the present embodiment, when different sources are reproduced on the left and right rear displays 22 and 23, L + R monaural sounds are output from the left and right speakers 22a and 23a, respectively. Further, when the same source is being reproduced on the left and right rear displays 22 and 23, stereo sound can be obtained by outputting L channel and R channel audio signals from the left and right speakers 22a and 23a.
[0024]
In the embodiment of FIG. 1 described above, the example in which the present invention is applied to the AV system including the left and right rear displays 22 and 23 in the rear seat of the vehicle has been described. However, in the AV system including three or more rear displays. Also, the present invention can be applied. FIG. 3 is a diagram schematically illustrating a configuration example of an AV system including three rear displays on the left and right and the center. In FIG. 3, parts having the same functions as those shown in FIG.
[0025]
In FIG. 3, 24 is a C rear display, which is provided in the center of the rear seat (for example, an arm member is attached to the headrest of the front seat, and the C rear display 24 is attached to the arm member). Similar to the other rear displays 22 and 23, the C rear display 24 also includes a speaker 24a for outputting sound and a monitor unit 24b for displaying video.
[0026]
Reference numeral 10 'denotes a head unit, which has substantially the same functional configuration as the head unit 10 shown in FIG. However, a selector for C rear display that selects and outputs one of various source signals of AM, FM, TV, CD, and DVD, and predetermined signal processing for the audio source signal selected by the selector. And a C-rear display voice processing unit (both not shown).
[0027]
The functions of the C rear display selector are the same as those of the L rear display selector 12 and the R rear display selector 13 shown in FIG. The C rear display audio processing unit combines the L channel and the R channel of the audio source signal selected by the C rear display selector, and always outputs an L + R audio signal.
[0028]
The controller in the head unit 10 ′ detects whether or not the same AV source is being reproduced on the L rear display 22, the R rear display 23, and the C rear display 24. And the audio | voice signal output to each rear display 22-24 is controlled according to the detection result.
[0029]
That is, when it is detected that the same AV source is being reproduced in all the rear displays 22 to 24, an L channel audio signal from the L rear display 22, an R channel audio signal from the R rear display 23, Control is performed so that an audio signal of the L + R channel is output from the C rear display 24. As a result, surround sound can be output from the three rear displays 22-24.
[0030]
On the other hand, when different AV sources are being reproduced on at least one of the rear displays 22 to 24, control is performed so that the L + R channel audio signals are output from all the rear displays 22 to 24. As a result, monaural sounds of different AV sources are independently output from the three rear displays 22-24.
[0031]
FIG. 4 is a diagram collectively showing the above-described operations. As shown in FIG. 4, when different sources are reproduced on the left and right and center rear displays 22 to 24, L + R monaural sounds are output from these three rear displays 22 to 24, respectively. When playing the same source on the left and right rear displays 22 to 24, the left and right rear displays 22 and 23 are used for the L channel, the R channel audio signal, and the center rear display 24 is used for the L + R channel. By outputting the audio signal, it is possible to obtain a sound having a surround effect.
[0032]
Further, when the same source is being reproduced on the left and right and the rear displays 22 to 24, the audio signals of the L channel, R channel, and L + R channel output to each rear display 22 to 24 are output. In this case, filter processing, delay processing, or both may be performed. FIG. 5 is a diagram illustrating an example of the filter processing and delay processing.
[0033]
In the example shown in FIG. 5, by performing filtering, only the frequency band of a human singing voice or the like is extracted and output to the central C rear display 24, and the left and right rear displays 22, 23 have musical instruments. The frequency band is extracted and the sound is output. Further, by applying a delay process, the sound of the musical instrument output from the left and right rear displays 22 and 23 is heard with a delay from the sound of a singing voice or the like output from the central C rear display 24. . By doing so, it is possible to obtain a more spacious sound field.
[0034]
In the above embodiment, the example in which the speaker mounted on the rear display is used as the rear seat speaker has been described. However, the present invention is not limited to the example using the speaker mounted on the display. For example, the same control may be performed using a rear speaker installed behind the rear seat.
[0035]
Moreover, although the said embodiment demonstrated the example which obtains a stereo audio | voice and a surround audio | voice using the several rear display installed in a backseat, a front speaker and a rear speaker are further added and a stereo audio | voice and a surround audio | voice are obtained. You may do it.
[0036]
For example, in the AV system including the front speaker 21 and the rear displays 22 and 23 as shown in FIG. 1, when the same source is reproduced on all of the front speaker 21 and the rear displays 22 and 23, the entire surround system is used. When sound is output and different sources are played back by the front speaker 21 and the rear displays 22 and 23, it is possible to output the same sound as described in the above embodiment. .
[0037]
Even if the L rear display 22 and the R rear display 23 are playing different sources, stereo sound or surround sound is output from the L rear display 22 and the L front speaker or L rear speaker. In addition, stereo sound or surround sound can be output from the R rear display 23 and the R front speaker or the R rear speaker.
[0038]
In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.
[0039]
【The invention's effect】
As described above, according to the present invention, in an AV system provided with a plurality of speakers in a vehicle and capable of independently reproducing any AV source, whether or not a single source is reproduced by the plurality of speakers. And the audio signal output to the plurality of speakers is controlled according to the detection result. For example, when a single source reproduction is detected, the single source audio signal is detected. Is divided into a plurality of systems (for example, L channel and R channel), and stereo sound can be obtained.
[0040]
Also, surround sound can be obtained by dividing the single-source audio signal into a plurality of systems (for example, L channel, R channel, L + R channel) and outputting it. Furthermore, a more complex surround effect can be obtained by performing filter processing, delay processing, or both on the audio signals of each system.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a main part of an AV system according to an embodiment.
2 is a diagram collectively showing operations of the AV system shown in FIG. 1; FIG.
FIG. 3 is a diagram showing another configuration example of the AV system according to the present embodiment.
4 is a diagram collectively showing operations of the AV system shown in FIG. 3. FIG.
FIG. 5 is a diagram illustrating an example of filter processing and delay processing performed by each of the L rear, R rear, and C rear audio processing units provided in the head unit illustrated in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Radio tuner 2 TV tuner 3 CD player 4 DVD player 5 Source signal input terminal 10, 10 'Head unit 11 Front speaker selector 11a Audio source selector 12 L Rear display selector 12a Audio source selector 12b Video source selector 13 R Rear Display selector 13a Audio source selector 13b Video source selector 14 Operation unit 15 Controller 16 L rear Display audio processing unit 17 R Rear display audio processing unit 21 Front speaker 22 L Rear display 22a Speaker 22b Monitor unit 23 R Rear display 23a Speaker 23b Monitor unit 24 C Rear display 24a Speaker 24b Monitor unit 25 Signal output terminal

Claims (1)

In an AV system provided with a plurality of speakers in a vehicle and capable of independently reproducing any AV source,
Detecting means for detecting whether or not a single source is reproduced in the plurality of speakers;
Control means for controlling audio signals to be output to the plurality of speakers according to a detection result by the detection means;
At least one of filter means for performing filter processing on each of the plurality of audio signals output from the control means or delay means for performing delay processing on each of the plurality of audio signals is provided. ,
The control means outputs the audio signals of the plurality of sources from the plurality of speakers, respectively, as single-line audio when the detection means detects reproduction of a plurality of sources, and the detection means only outputs a single source. When reproduction is detected, the audio signal of the single source is divided into a plurality of systems and output from the plurality of speakers,
At least one of the filter unit or the delay unit performs at least one of filter processing and delay processing on the output audio signals of the plurality of systems, respectively.
AV system characterized by this.

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