JP2005223505A - On-vehicle acoustic reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle acoustic reproducing apparatus capable of effectively separating different reproduced sounds into sound to a rear seat and sound to a front seat when the different sounds are reproduced in the interior of a vehicle. <P>SOLUTION: In the on-vehicle acoustic reproducing apparatus provided with sound sources A, B, ..., X, front seat speakers 14FL, 14FR, and rear seat speakers 14RL, 14RR, a microcomputer 16 detects a separate sound source state wherein the sound sources of sound to be outputted to the rear seat is different from the sound sources of sound to be outputted to the front seat, and controls the plurality of speakers to revise the directivity of sound emitted from the speakers when detecting the different sound source state. Concretely, the microcomputer 16 changes the direction of the front seat speakers and/or the rear seat speakers, or exposes rear seat exclusive speakers toward the rear seat and drives the rear seat exclusive speakers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an on-vehicle sound reproducing apparatus that includes a plurality of sound sources and a plurality of speakers, and reproduces different sounds simultaneously in a passenger compartment.

  In recent years, in a vehicle, an audio playback device (car audio device) mounted on an instrument panel is operated freely even from the back seat side, and a sound different from the sound heard on the front seat side is (See, for example, Patent Document 1 below). Furthermore, it is becoming possible to enjoy images by TV (television), DVD, etc. on the rear seat side.

  As shown in FIG. 1, the first type of the on-vehicle sound reproducing device that enables independent voice listening on the rear seat side as described above is a front speaker (front seat side speaker) disposed near the front seat. ) And a rear speaker (rear seat side speaker) arranged in the vicinity of the backseat are made to output sound based on different sound source signals. In this case, since the passenger in the rear seat can also hear the sound from the front speaker, there is a problem that it is difficult to hear the sound from the rear speaker due to the mixing of the sounds.

  Further, as shown in FIG. 2, the second type of the on-vehicle sound reproducing device that enables the original sound listening at the rear seat side is to output the sound by the same sound source signal from the front speaker and the rear speaker. The sound from the different sound source signals is output from the headphones on the rear seat side. In this case, there arises a problem that the passenger in the rear seat must wear headphones one by one.

JP 2002-75284 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to emit a sound to be radiated to the rear seat side and a front seat side when different sounds are reproduced in the vehicle interior. An object of the present invention is to provide an on-vehicle sound reproducing device capable of effectively separating power sound.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided an in-vehicle sound reproducing device that includes a plurality of sound sources and a plurality of speakers and is capable of simultaneously outputting the plurality of sound sources from the plurality of speakers. The sound source to be output to the rear seat side is different from the sound source to be output to the front seat side, and another sound source state is detected by the detection means. And a control means for performing control to change the directivity of the sound radiated from the plurality of speakers.

  According to the second aspect of the present invention, in the in-vehicle sound reproducing device according to the first aspect of the present invention, the detection means detects the different sound source state based on an operation state of a sound source selection circuit. .

  According to a third aspect of the present invention, in the in-vehicle sound reproducing device according to the first aspect of the present invention, the detection means is configured to generate the separate sound source state based on a power-on state of the rear seat display. Is detected.

  Further, according to a fourth aspect of the present invention, in the on-vehicle sound reproducing device according to the first aspect of the present invention, the control means is configured to detect the front seat side speaker and / or the sound source when the separate sound source state is detected. Alternatively, the direction of the rear seat speaker is changed.

  According to a fifth aspect of the present invention, in the in-vehicle sound reproducing device according to the first aspect of the present invention, the control means is configured to move rearward toward the rear seat when the different sound source state is detected. Drive with the speaker dedicated to the seat exposed.

  In the in-vehicle sound reproducing device according to the present invention, the sound that should be radiated to the rear seat side and the sound that should be radiated to the front seat side when the different sounds are reproduced in the vehicle interior are effective due to the above configuration. Separated.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 3 is a block diagram showing a configuration of an embodiment of the on-vehicle sound reproducing device according to the present invention. In the figure, each of a sound source A, a sound source B,..., And a sound source X is a broadcast receiver such as an AM tuner, an FM tuner, a TV tuner, or a recording medium player such as a cassette deck, a CD player, or a DVD player. Audio signals from each sound source are guided to a front seat side source selector 10F and a rear seat side source selector 10R as a sound source selection circuit.

  Each of the source selectors 10F and 10R selects an audio signal from one sound source based on a control signal from the microcomputer 16. Next, the front seat side power amplifier 12F and the rear seat side power amplifier 12R amplify the power of the selected front seat side and rear seat side audio signals, respectively. The front seat side left speaker 14FL and the front seat side right speaker 14FR convert the power-amplified front seat side audio signal into a sound wave and radiate it. Similarly, the rear-seat-side left speaker 14RL and the rear-seat-side right speaker 14RR convert the power-amplified rear-seat side audio signal into a sound wave and radiate it.

  The front seat speakers 14FL and 14FR are provided with a drive unit 18F for driving them under the control of the microcomputer 16 so that they can change the direction to the left and right. Similarly, a drive unit 18R for driving the speakers under the control of the microcomputer 16 is provided so that the rear seat speakers 14RL and 14RR can change directions from side to side.

  The microcomputer 16 detects whether the mode is the normal mode or the different sound source mode. Here, the normal mode means a state where the sound source of the sound to be output to the rear seat side is the same as the sound source of the sound to be output to the front seat side, and the different sound source mode is output to the rear seat side. This is a state in which the sound source to be sounded is different from the sound source to be output to the front seat side.

  Specifically, the microcomputer 16 recognizes that it is in the normal mode when both of the source selectors 10F and 10R select the same sound source, while different when the source selectors 10F and 10R select different sound sources. Recognize that it is in sound source mode.

  Alternatively, when the rear seat dedicated TV apparatus is mounted, the microcomputer 16 recognizes that the rear seat display is in another sound source mode when the power is turned on, but the power is not turned on. Sometimes it is possible to recognize that it is in the normal mode.

  In the normal mode, the front seat speakers 14FL and 14FR and the rear seat speakers 14RL and 14RR are oriented substantially perpendicular to the vehicle side as shown in FIG. However, when the microcomputer 16 detects the transition to the different sound source mode, as shown in FIG. 5, the front seat speakers 14FL and 14FR are connected to the front side of the vehicle, and the rear seat speakers 14RL and 14RR are connected. In this case, the drive units 18F and 18R are controlled so as to change the direction toward the vehicle rear side.

  Thus, even if different sounds are emitted from the front seat speakers 14FL and 14FR and the rear seat speakers 14RL and 14RR, they are prevented from being mixed and difficult to hear. Note that a certain effect can be obtained only by changing the direction of only one of the front seat side speaker and the rear seat side speaker.

  Alternatively, when the transition from the normal mode to the different sound source mode is detected, the microcomputer 16 drives the rear seat dedicated speaker to the rear seat. That is, in the normal mode, the front seat speakers 14FL and 14FR and the rear seat speakers 14RL and 14RR radiate the same sound in the state shown in FIGS.

  However, when the sound source mode is shifted to another sound source mode, as shown in FIGS. 7A and 7B, the rear seat speaker 14RS is exposed, and the sound to be radiated from the rear seat speakers 14RL and 14RR is reflected in the rear seat. Control by the microcomputer 16 is performed so that radiation from the dedicated speaker 14RS and radiation from the rear seat speakers 14RL and 14RR stop.

  The rear seat dedicated speaker 14RS may be exposed to any location such as a ceiling, a rear door, a seat, a rear side trim, and a back door as long as the directivity of sound to the rear seat can be secured.

  Thus, even if different sounds are emitted from the front seat speakers 14FL and 14FR and the rear seat speaker 14RS, they are not mixed and difficult to hear.

It is a block diagram which shows the example of 1 structure of the conventional vehicle-mounted audio reproduction apparatus. It is a block diagram which shows the other structural example of the conventional vehicle-mounted audio reproduction apparatus. It is a block diagram which shows the structure of one Embodiment of the vehicle-mounted audio reproduction apparatus by this invention. It is a top view which shows the operation state of the normal mode in one Embodiment of this invention. It is a top view which shows the operation state of another sound source mode in one Embodiment of this invention. It is a figure which shows the operation state of the normal mode in other embodiment of this invention, (A) is a side view, (B) is a top view. It is a figure which shows the operation state of another sound source mode in other embodiment of this invention, Comprising: (A) is a side view, (B) is a top view.

Explanation of symbols

10F ... Front seat side source selector 10R ... Rear seat side source selector 12F ... Front seat side power amplifier 12R ... Rear seat side power amplifier 14FL ... Front seat side left speaker 14FR ... Front seat side right speaker 14RL ... Rear seat side left speaker 14RR ... rear-seat-side right speaker 14RS ... rear-seat-only speaker 16 ... microcomputer 18F ... front-seat-side speaker drive unit 18R ... rear-seat-side speaker drive unit

Claims (5)

A vehicle-mounted sound reproduction device comprising a plurality of sound sources and a plurality of speakers and capable of simultaneously outputting the plurality of sound sources from the plurality of speakers,
Detecting means for detecting another sound source state in which the sound source of the sound to be output to the rear seat side is different from the sound source of the sound to be output to the front seat side;
Control means for performing control to change the directivity of sound emitted from the plurality of speakers when another sound source state is detected by the detection means;
An on-vehicle sound reproducing device comprising:   The on-vehicle sound reproduction device according to claim 1, wherein the detection unit detects the different sound source state based on an operation state of the sound source selection circuit.   The on-vehicle sound reproduction device according to claim 1, wherein the detection means detects the separate sound source state based on a power-on state of the rear seat display.   The on-vehicle sound reproduction device according to claim 1, wherein the control unit changes a direction of the front seat side speaker and / or the rear seat side speaker when the different sound source state is detected.   The on-vehicle sound reproduction device according to claim 1, wherein the control means drives the rear seat exclusive speaker to be exposed toward the rear seat when the different sound source state is detected.

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