JP2006270302A - Sound reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an onboard sound reproducing device which can achieve a front normal position even if using back speakers as main speakers. <P>SOLUTION: The sound reproducing device includes a plurality of back speakers 20R arranged behind a listener X, a front speaker 20F which is arranged ahead of the listener X and which can reproduce a loud sound zone at least, and a stereo sound source regenerating part 11 for supplying the sound signal of a plurality of channels corresponding at the sound source to the back speaker 20R and the front speaker 20F and supplying the sound signal including the loud sound zone at least of the sound source to the front speaker 20F. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an acoustic reproduction apparatus that outputs sound from a plurality of rear speakers.

2. Description of the Related Art Conventionally, an on-vehicle sound reproduction device is known in which a speaker (rear speaker) is arranged in each seat of a vehicle and an acoustic source is reported to a listener sitting on the seat via the speaker (for example, Patent Document 1). ). This type of in-vehicle sound reproduction device can arrange a speaker near the ears of each occupant, so that a small output amplifier can be used, and a different acoustic space can be provided for each occupant. There is.
JP-A-9-171387

  However, in the conventional configuration, since the speaker is disposed only behind the listener, it is difficult to localize the sound in front of the listener. On the other hand, if a main speaker for sound reproduction (so-called main speaker) is arranged in front of the listener and a main audio signal is supplied to the main speaker, the front localization can be realized. A relatively large distance is left between the main speaker and the listener, and a high-power amplifier is required. In addition, since a relatively loud sound is output from the main speaker, it is difficult to provide a different acoustic space for each occupant.

  The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide an in-vehicle acoustic device capable of realizing front localization even when a rear speaker is used as a main speaker.

In order to solve the above-described problem, the present invention provides a sound reproducing apparatus, wherein a plurality of rear speakers arranged behind a listening position, a front speaker arranged in front of the listening position and capable of reproducing at least a high frequency range, A sound source device that supplies a plurality of channels of sound signals corresponding to a sound source to the rear speaker and the front speaker, respectively, and a sound source device that supplies a sound signal including at least a high frequency range of the sound source to the front speaker. It is characterized by providing.
According to this configuration, the sound source sound is output from the plurality of rear speakers, and the high sound range sound of the sound source is output from the front speaker. Therefore, the front localization is realized even when the rear speaker is used as the main speaker. be able to.

  The said structure WHEREIN: The said back speaker may be attached to the backrest part of the seat for listeners, and the said seat is good also as a seat arrange | positioned in a vehicle. Moreover, it is preferable that the sound source device supplies an acoustic signal including at least a low sound range or a mid sound range of the sound source to the rear speaker.

  The present invention includes a plurality of rear speakers and a front speaker capable of reproducing at least a high sound range, and outputs sound source sound from the rear speaker and outputs sound source sound from the front speaker. Even if the speaker is used as a main speaker, the front localization can be realized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram illustrating a speaker arrangement configuration of the sound reproducing device 10 according to the first embodiment. The sound reproducing device 10 is configured as an in-vehicle acoustic device mounted on the vehicle 1, and in the following description, directions such as left and right are viewed from a passenger sitting on the seat 2 (2 A, 2 B, 2 C, 2 D) of the vehicle 1. Corresponds to the direction.
The vehicle 1 has a plurality of seats 2 including a driver seat 2A, a passenger seat 2B, a rear seat 2C, and 2D, and a rear speaker 20R and a front speaker 20F are provided for each seat. More specifically, the rear speaker 20R is composed of three loudspeakers per seat, two full-range speakers 20RL and 20RR for two left and right channels, and a woofer (low range reproduction speaker) 20RW. 2, full-range speakers 20RL and 20RR are attached to the left and right of the headrest 2H toward the vehicle front (occupant side), and the woofer 20RW is mounted on the backrest (seat back) 2S on the vehicle front (occupant side). Built in. For example, speakers having a diameter of about 50 to 100 mm are used for the full range speakers 20RL and 20RR.

The vehicle 1 includes, as the front speaker 20F, one tweeter (high-frequency reproduction speaker) 20F1 for the driver seat 2A and the passenger seat 2B, and one tweeter for each rear seat 2C, 2D passenger. 20F2 and 20F3 are provided. In addition, it is preferable to use the tweeters 20F1 to F3 that are superior to the full-range speakers 20RL and 20RR in their high sound range reproduction capability.
More specifically, as shown in FIG. 1, the tweeter 20F1 is attached to the center of the front dashboard 1D toward the rear of the vehicle, thereby being in front of the driver seat 2A and the passenger seat 2B, and It is arranged at a position equidistant from the driver's seat 2A and the passenger seat 2B.
The tweeters 20F2 and 20F3 are respectively attached to the back surface of the driver's seat 2A and the back surface of the passenger seat 2B, and are disposed relatively close to the front of the passenger sitting in the rear seats 2C and 2D.

  By adopting the above speaker arrangement configuration, as shown in FIG. 3, the passengers of each seat 2 can hear the sound from the two full-range speakers 20RR and 20RL and the woofer 20RW arranged in the vicinity of the rear and the front. The sound from one front speaker (tweeter) 20 </ b> F arranged relatively close can be received. FIG. 1 illustrates the case where the passengers in the driver's seat 2A and the passenger seat 2B share one front speaker 20F. However, the present invention is not limited to this, and the front speaker 20F is provided for each passenger in the driver seat 2A and the passenger seat 2B. May be arranged. Further, the front speaker 20F for the occupants of the rear seats 2C and 2D may be a single unit, and the front speaker 20F may be shared by the occupants of the rear seats 2C and 2D.

Next, the sound reproducing device 10 will be described. The sound reproduction device 10 is a device that is connected to speakers 20F and 20R in the vehicle 1 via a speaker cable and is driven by power from the battery of the vehicle 1 to output sound from the speakers 20F and 20R. In the following description, the rear speaker 20R and front speaker 20F for the occupant of one seat 2 and the sound reproducing device 10 will be described in detail in order to avoid overlapping description.
As shown in FIG. 4, the sound reproducing device 10 includes a stereo sound source reproducing unit (sound source device) 11 that reproduces a two-channel sound source. The stereo sound source reproducing unit 11 is a CDDA (Compact Disc Digital Audio: music CD). ) And a radio receiver for receiving radio broadcasts, and a stereo signal of any sound source (CDDA or radio) according to the selection of the listener (occupant) X, that is, L The channel audio signal SL and the R channel audio signal SR are output.

The sound reproducing device 10 includes a plurality of amplifiers 12A, 12B, 12C, and 12D, and these amplifiers 12A to 12D are connected to the speakers 20R and 20F via speaker cables. As shown in FIG. 2, among these amplifiers 12A to 12D, an L channel audio signal SL is supplied to an amplifier 12A corresponding to the full range speaker 20RL, and an R channel audio signal SL is supplied to the amplifier 12B corresponding to the full range speaker 20RR. An audio signal SR is supplied.
For this reason, the amplifiers 12A and 12B drive the speakers 20RL and 20RR in accordance with the input audio signals SL and SR, respectively, so that the left channel audio is output from the full-range speaker 20RL disposed at the left rear of the listener X. The right channel sound is output from the full-range speaker 20RR arranged at the right rear of the listener X. Thereby, the stereo sound is output so that the listener X can recognize the left and right space (stereo space) of the acoustic source.

The sound reproduction apparatus 10 includes two synthesis units 13A and 13B that synthesize (mix) the audio signals SR and SL. The output audio signal SLR1 of one synthesis unit 13A has a low-pass filter (LPF) 14. Via the amplifier 12C corresponding to the woofer 20RW.
Accordingly, the amplifier 12C drives the woofer 20RW in accordance with the input sound signal (low sound range sound signal), so that the low sound range of the acoustic source is output toward the listener X. As a result, even when the low-range reproduction capability of the full-range speakers 20RL and 20RR is relatively low, the woofer 20RW can compensate for the bass.
Here, since the arrival direction of the bass is difficult for humans to perceive, even if the bass is reported from behind the listener X as in this configuration, the bass is reported from the front of the listener X. Almost the same acoustic space can be provided.

Further, the output audio signal SLR2 of the other synthesizing unit 13B is supplied to the amplifier 12D corresponding to the front speaker (tweeter) 20F via the high pass filter (HPF) 15.
Accordingly, the amplifier 12D drives the front speaker (tweeter) 20F in accordance with the input sound signal (high sound range sound signal), so that the high sound of the sound source is output toward the front of the listener X.
Here, since the high sound is different from the low sound in that the direction of arrival is easily perceived by a person, the high sound output from the front speaker (tweeter) 20F causes the listener X to perceive that the arrival direction of the sound source is the front. Is done. As a result, even in a listening environment in which stereo sound is output from the rear speaker 20R, front localization is realized by the high sound from the front speaker 20F.

As described above, in this configuration, the stereo sound of the acoustic source is output from the plurality of rear speakers 20R disposed behind the listener X, and the acoustic source of the acoustic source is output from the front speaker 20F disposed in front of the listener X. Since the high sound range sound is output, it is possible to easily realize the acoustic space of the front localization while using the rear speaker 20R as the main speaker.
Further, since the rear speaker 20R is disposed on the backrest portion 2S of the seat 2, the rear speaker 20R can be disposed close to the listener X, and an acoustic space that satisfies each listener X can be provided with a relatively small volume. Become. For this reason, it is possible to provide a sound space of the front localization for each occupant of each seat 2, and it is possible to employ a small output amplifier for the amplifiers 12A to 12C for driving the rear speaker 20R and to drive the tweeter 20F. Since the amplifier 12D to be used may be a relatively small output amplifier, power consumption can be reduced, and the sound reproduction device 10 can be reduced in size and cost.

<Second Embodiment>
FIG. 5 is a diagram illustrating a configuration of a sound reproducing device 10A according to the second embodiment. In this figure, the same components as those of the sound reproducing device 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The sound reproducing device 10A includes a sound source device 11A that outputs a multi-channel sound signal. Specifically, the sound source device 11A is a multi-channel (5.1 in this example) such as a DVD (Digital Versatile Disk). A multi-channel sound source reproduction unit 11A1 that reproduces a recording medium that records a sound source of (channel), and an acoustic processing unit 11A2 that generates a four-channel audio signal based on the 5.1-channel audio signal reproduced by the reproduction unit 11A1. And is configured.

  More specifically, the reproduction unit 11A outputs 5.1-channel audio signals for front left and right, center, rear left and right, and woofer, and the acoustic processing unit 11A2 outputs woofer audio signals SW. The center audio signal SC is supplied to the amplifier 12D corresponding to the front speaker (tweeter) 20F via the high-pass filter (HPF) 15 as it is.

  In addition, the acoustic processing unit 11A2 generates pseudo two-channel audio signals SRA and SRB from the multi-channel audio signals. Specifically, for example, the acoustic processing unit 11A2 generates a pseudo L channel audio signal SRA by performing predetermined acoustic processing (downmix processing) on the front left, center, and rear left audio signals. At the same time, by performing predetermined acoustic processing (downmix processing) on the front right, center, and rear right audio signals, a pseudo R channel audio signal SRB is generated. The acoustic processing (downmix processing) may be either a method performed by digital processing using a DSP (Digital Signal Processor) or a method performed by synthesizing analog audio signals.

Then, the acoustic processing unit 11A2 supplies the pseudo L channel audio signal SRA to the amplifier 12A corresponding to the full range speaker 20RL, and supplies the pseudo R channel audio signal SRB to the amplifier 12B corresponding to the full range speaker 20RR. As a result, pseudo stereo sound is output from the full-range speakers 20RL and 20RR disposed on the left and right rear sides of the listener X, and the pseudo acoustic sound is output toward the listener's ear.
In this case, since the low-frequency sound of the acoustic source is output from the woofer 20RW, the listener can listen to the original low-frequency sound of the acoustic source, and the high-frequency sound of the acoustic source can be heard from the front speaker (tweeter) 20F. Is output, so that it is possible to provide an acoustic space with a front localization.

As described above, in this configuration, a pseudo acoustic signal is generated from a multi-channel acoustic source, and the pseudo acoustic signal is output from the rear speaker 20R, and the high-frequency sound of the acoustic source is output from the front speaker 20F. While using the rear speaker 20 </ b> R as a main speaker, it is possible to easily realize a sound space with a front localization.
Further, as in the first embodiment, the rear speaker 20R is arranged close to the listener X, so that an acoustic space that satisfies each listener X with a relatively low volume is provided. A sound space with a front localization can be provided every time, and an amplifier with a small output can be adopted as the amplifiers 12A to 12D, so that power consumption can be reduced, and the acoustic reproduction apparatus 10 can be reduced in size and cost.

The above-described embodiment is merely one aspect of the present invention, and can be arbitrarily modified within the scope of the present invention. For example, in each of the above-described embodiments, the full-range speakers 20RL and 20RR may output sound in the middle sound range or middle to low sound range of the sound source, and may output high sound sound of the sound source only from the front speaker 20F. Good. Further, the woofer 20RW may be omitted when the full-range speakers 20RL and 20RR have sufficient bass reproduction capability.
In the second embodiment described above, the case where the front speaker 20F outputs the high sound range of the center sound has been described. However, the synthesized signal of the pseudo L channel audio signal SRA and the pseudo R channel audio signal SRB High frequency sound may be output.
Moreover, although the case where this invention is applied to the sound reproduction apparatus for vehicles was illustrated in embodiment mentioned above, you may apply to sound reproduction apparatuses other than for vehicles.

It is a figure which shows the speaker arrangement configuration of the sound reproducing device according to the first embodiment of the present invention. It is a figure which shows the example of arrangement | positioning of a rear speaker. It is a figure where it uses for description of a rear speaker and a front speaker. It is a figure which shows the structure of a sound reproducing device. It is a figure which shows the structure of the sound reproduction apparatus which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Seat 10, 10A Sound reproduction device 11 Stereo sound source reproduction part (sound source device)
11A sound source device 11A1 multi-channel sound source reproduction unit 11A2 sound processing unit 12A-12D amplifier 13A, 13B synthesis unit 14 low-pass filter 15 high-pass filter 20F front speaker 20F1-20F3 tweeter 20R rear speaker 20RL, 20RR full range speaker 20RW woofer

Claims (4)

A plurality of rear speakers arranged behind the listening position;
A front speaker arranged in front of the listening position and capable of reproducing at least a high sound range;
A sound source device that supplies a plurality of channels of sound signals corresponding to a sound source to the rear speaker and the front speaker, respectively, and a sound source device that supplies a sound signal including at least a high frequency range of the sound source to the front speaker. A sound reproducing device comprising:   The sound reproducing device according to claim 1, wherein the rear speaker is attached to a backrest portion of a seat for a listener.   The sound reproducing apparatus according to claim 2, wherein the seat is a seat installed in a vehicle.   The sound source device according to any one of claims 1 to 3, wherein the sound source device supplies an acoustic signal including at least a low sound region or a middle sound region of the sound source to the rear speaker.

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