JPH0141267Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to the improvement of a movable speaker system in which the sound pressure level changes as the speaker body moves, and the sound pressure level is always optimal for the listening position.
More specifically, the present invention relates to a movable speaker system that can obtain effective acoustic characteristics through reverberant sound.

Conventional technology and problems Traditionally, in-vehicle speaker systems include recessed speakers and box-type speakers that are fixedly installed on the rear tray, etc., as well as movable speakers that allow the speaker body to be moved and placed in an appropriate location. For example, there is one in which a rail base is disposed on the ceiling of the vehicle interior, and the speaker body slides on the rail base. However, the latter sliding type vehicle-mounted speaker has drawbacks such as the need to change the volume balance each time the speaker body is installed at a different location, and the need to consider wiring, which is cumbersome.

Therefore, as an in-vehicle speaker system that eliminates the above-mentioned drawbacks, the present application proposes a movable volume variable speaker system in which the sound pressure level of the signal supplied to the speaker body from the acoustic device automatically changes as the speaker body moves. The person has already proposed it as Utility Application No. 58-93929.

Here, the movable variable volume speaker system will be explained with reference to the drawings.

FIG. 1 is a schematic diagram of the movable speaker system already proposed above.

In the figure, 1 is an audio device such as a cassette deck or tuner, 2 is a speaker body, and 3 is a rail base that holds the speaker body 2 so as to be able to slide back and forth.
Reference numeral 4a denotes a volume variable means for controlling the sound pressure level of a signal supplied to the speaker body 2, and here, a volume for general speakers with a balanced continuously variable attenuator is used as the volume variable means. 5 is the conductor, 6 and 6' are the speaker body 2
7 is a motor, 8 is a pulley with a reduction gear, 9 is a pulley, 10 is a geared pulley 8 and A wire 11 is wound around a pulley 9 in a loop shape and is a reduction gear. Speaker body 2
is partially fixed to the wire 10 so as to be able to slide along the rail base 3, and when the motor 7 is rotated, the rotation speed of the motor 7 is reduced by the reduction gear of the pulley 8 with a reduction gear. The speed is reduced to an appropriate speed for sliding. Thereby, the speaker body 2 fixed to the wire 10 is slid along the rail base 3 at an appropriate speed. In addition, as the speaker body 2 moves, the speed reduced by the reduction gear of the pulley 8 with a reduction gear is further reduced by the reduction gear 11, and the knob of the volume 4a is rotated. The resistance value of 4a is varied. With this configuration, the signal output from the audio device 1 is attenuated to a signal level corresponding to the resistance value of the volume 4a, and is input to the speaker body 2 via the conductor 5 through the sliders 6 and 6', and is output to the speaker body 2. sounds.

The resistance value of the volume 4a is adjusted to the length of the rail base 3 so that the speaker body 2 can be moved while always supplying a signal at the optimal level to the listening position, for example, the driver's seat. On the other hand, when the speaker body 2 is located nearby, the resistance value of the volume 4a is large and the level of the speaker drive signal is low, and when the speaker body 2 is located far away, the resistance value of the volume 4a is small and the level of the speaker drive signal is low. The level is set to increase. Therefore, music etc. can always be heard at a constant sound pressure level regardless of the position of the speaker.

Furthermore, with this configuration, depending on the listener's preference, when a listener wants a sound field with sharp sound image localization, the speaker body can be brought closer to let in more direct sound, or when a listener wants a sound field with a sense of presence, the speaker body 2 can be moved closer. It is possible to obtain a reverberation effect by moving more of the reflected sound from inside the vehicle interior, making it possible to create an effective sound field at the listening position without having to adjust the volume.

However, with the above configuration, since the vehicle interior is a small space for sound reproduction, the reverberation time is very short, and a sufficiently effective and realistic sound field is formed only by the reflected sound inside the vehicle interior. It was extremely difficult to do so.

Purpose of the invention The present invention has been devised in view of the above-mentioned drawbacks of the conventional technology.
Moreover, it is an object of the present invention to provide an on-vehicle speaker system that can form an effective and realistic sound field.

Structure of the Invention In order to achieve the above object, the present invention includes a speaker body that reciprocates on a rail base, and a speaker body that controls the signal level supplied to the speaker body from an audio signal reproducing device based on the position of the speaker body. a reverberant sound generating means for generating reverberant sound in response to the output of the audio signal reproducing device; and a reverberant sound generating means for varying the output level according to the position of the speaker body from the reverberant sound generating means. The present invention is characterized in that a second volume variable means is provided which supplies the output of the means to the speaker body.

Embodiment of the invention Hereinafter, an embodiment of the invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram of the in-vehicle speaker system according to the present invention, and in the figure, all parts denoted by the same reference numerals as in FIG. 1 have the same functions. In the figure, a second volume variable means 4b that controls the output level of the reverberant sound generating means 12 is connected to the reverberant sound generating means 12 that generates reverberant sound, and the second volume variable means 4b is connected to a resistor Rb. It is connected to the. The circuit consisting of the reverberation sound generating means 12, the second volume variable means 4b, and the resistor Rb is as follows:
It is connected in parallel to a circuit consisting of a first volume variable means 4a and a resistor Ra connected to the first volume variable means 4a, and a power amplifier 16 is connected to a connection point 15. Resistors Ra and Rb are mixing resistors for combining the output signals from the first and second volume variable means 4a, 4b. The reverberation sound generating means 12 includes a delay circuit 13 and the delay circuit 1.
3, and a feedback circuit which attenuates a part of the output signal of No. 3 to a predetermined level by a variable resistor 14 and inputs it again to the delay circuit 13. That is, a portion of the signal delayed by the delay circuit 13 is attenuated by the variable resistor 14 and further delayed by the delay circuit 13. Repetition of such operations produces a reverberation effect.

In this embodiment, the first and second volume variable means 4
Two attenuators are provided as a and 4b, and a two-resistance type volume 4 is used in which the resistance values of these attenuators can be controlled separately. That is, by rotating the knob of the volume 4, the sliding terminals 17a and 17b slide separately on the resistors R4a and R4b, and the resistance values of the first and second volume varying means 4a and 4b are controlled. be done.

Here, the first and second volume variable means 4a, 4
The configuration for controlling the resistance value of b is similar to the configuration shown in FIG. That is, by rotating the motor 7 by operating a spring-type electric key (not shown), the speaker body 2 is slid along the rail base 3, and at the same time, the knob of the volume 4 is rotated, and the first and second volume variables are adjusted. The resistance values of the means 4a and 4b are individually controlled depending on the position of the speaker body 2.

With this configuration, the signal output from the audio device 1 such as a cassette deck or tuner is directly input to the first volume variable means 4a and is attenuated to a level corresponding to the resistance value of the first volume variable means 4a. At the same time, the reverberant sound is input to the second sound variable means 4b via the reverberant sound generating means 12, and is attenuated to a level corresponding to the resistance value of the second sound volume variable means 4b. The output signals of the first and second volume variable means 4a, 4b are combined at a connection point 15 via resistors Ra and Rb, respectively, and amplified to a predetermined level by a power amplifier 16, and then output via a conductor 5. The signal is input to the speaker body 2 from the actuators 6 and 6' and causes the speaker to sound.

Here, first and second volume variable means 4a, 4b
To give a favorable example of setting the resistance value of the first volume variable means 4a, the resistance value of the first volume variable means 4a may be set in the same manner as explained in FIG. The resistance value is such that when the speaker body 2 is located close to the driver, the level of the output signal of the second volume variable means 4b is very small, and when the speaker body 2 is located far away, the level becomes large. By setting the speaker body 2
When the speaker body 2 is located nearby, a sound field with clear sound image localization can be created using only the direct sound, and when the speaker body 2 is located far away, the direct sound and reverberant sound create a sound field with a sense of presence. It is possible to create a field.

Note that the resistance value of the second volume variable means 4b is not limited to the above-mentioned example, and when a listener desires a sound field with a sense of presence at all times, the resistance value of the second volume variable means 4b is not limited to the above example. The level of the output signal of the second volume variable means 4b may be set to be high to some extent even when the second volume variable means 4b is located nearby.

Furthermore, if a variable resistor is added between the reverberant sound generating means 12 and the second volume variable means 4b, by changing the resistance value of the variable resistor, the second volume variable means 4b can be adjusted to a predetermined position of the speaker body 2. The output signal level can be easily set and controlled, and the sound field can be freely selected according to the listener's preference.

Effects of the Invention As explained in detail above, the movable speaker system according to the present invention includes a reverberation sound generating means that generates reverberation sound according to the output of the acoustic device, and a reverberation sound generation means that generates reverberation sound based on the position of the speaker body. Since a second volume variable means is provided to control the output level of the means and supply it to the speaker body, it is possible to always supply the signal at the optimal level to the listening position regardless of the position of the speaker body, and the speaker Depending on the position of the main body, it is possible to create an effective and realistic sound field.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional movable speaker system, and FIG. 2 is an embodiment of the present invention. In the figure, 1 is an audio device, 2 is a speaker body, 3 is a rail base, 4a, 4b are volume variable means, 5 is a conductor, 6 is a slider, 7 is a motor, 8 is a pulley with a reduction gear, 9 is a pulley, 10 is a wire, 1
1 is a reduction gear, 12 is a reverberation sound generating means, and 16 is a power amplifier.

Claims (1)

[Scope of utility model registration request] A speaker body that moves back and forth on a rail base,
a first volume variable means for controlling the signal level supplied from the audio signal reproduction device to the speaker body based on the position of the speaker body; and a reverberation sound generator for generating reverberation sound in response to the output of the audio signal reproduction device. and a second volume variable means for supplying an output level from the reverberant sound generating means according to the position of the speaker body to the speaker body together with the output of the first volume variable means. Movable speaker system.