JPH06232953A - Active silencer for on-vehicle telephone room - Google Patents

Abstract

PURPOSE:To decrease only a noise level of a major noise in the vicinity of a telephone set in a telephone room in a railway vehicle with a simple configuration device to a degree not disturbing a talking without remarkable increase of a weight of the vehicle against the noise delivered from a noise source at the outside of the room to the in-room. CONSTITUTION:A noise controller 1 transmits a secondary tone of a single waveform in opposite phase to a major sound wave of a single waveform causing hindrance to talking among noise sounds in the vicinity of a telephone set in a telephone room in a railway vehicle. An amplifier 2 connects to the noise controller to amplify the secondary sound of opposite phase and a speaker 3 sends the secondary sound of opposite phase received from the amplifier to the vicinity of the telephone set of the telephone room in the railway vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active silencer for a vehicle telephone room, and is used to reduce only the noise level of the main noise near the telephone in the railway vehicle telephone room.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the noise level in a room partitioned by a wall surface, the noise source inside or outside the room is covered with a sound absorbing member or the noise source outside the room is transmitted to the room through the wall surface. In order to block the noise caused by noise, the wall surface was subjected to soundproofing. Also,
Recently, with respect to noise radiated into the interior of automobiles and noise generated from home appliances, secondary noise that reverses the density of noise and pressure is sent from the active silencer to mute the sound. Has been experimentally attempted.

[0003]

However, when the noise source is covered with a sound absorbing member or the like, it cannot be applied unless the noise source is specified. Also, when soundproofing is applied to the wall surface, if a heavy material with no gaps is used to improve sound insulation (mass law regarding transmission loss), the weight increases significantly compared to the amount of noise level reduction. growing.

Further, when it is attempted to reduce the noise level of the noise radiated into the interior of an automobile or the noise generated from home electric appliances by using the active silencer, the number of parts is increased and the configuration of the device becomes large. In addition to complexity and weight, at some locations the noise level could be higher than before the device was used.

The present invention has been made in view of these circumstances, and a railway vehicle telephone room is provided by a device having a simple structure without significantly increasing the vehicle weight with respect to the noise transmitted from the outdoor noise source to the indoor room. The purpose of the present invention is to provide an active silencer for a vehicle telephone room, which can reduce only the main noise level near the telephone set to such an extent that it does not hinder passage.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and of the noise transmitted in the vicinity of the telephone of the vehicle, the main sound wave having a single waveform and the phase that disturbs the call. A noise controller that emits an antiphase sound wave for reversing the noise, an amplifier that is connected to this noise controller, and that amplifies the sound wave with a single waveform that is input from it, and an amplifier that is input from the amplifier. An active muffling apparatus for a vehicle telephone room, comprising: a speaker installed so as to send a subsequent antiphase single-waveform muffling sound wave toward the vicinity of a telephone of a vehicle.

The noise controller having the above-described structure, which emits a main sound wave having a single waveform and a sound wave for silencing that is in antiphase, and an amplifier for amplifying the sound wave for silencing having a single waveform input from the noise controller. The unit that consists of the speaker and the speaker that sends out the amplified anti-phase single-waveform sound wave that is input from the amplifier is installed in the handset body or handset of the railway car telephone, and the speaker is the person who talks. It may be configured to be provided in the direction of the face.

[0008]

[Function] When the anti-phase muffling sound wave transmitted from the noise controller is amplified by the amplifier and sent out from the speaker to the vicinity of the telephone in the vehicle telephone room, among the noise transmitted from the outside of the railcar to the vicinity of the telephone, The main single-wave sound wave that interferes with the call is canceled by the anti-phase noise canceling sound wave, and the noise level is reduced. It can be performed in an easy state.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, in which an active silencer for a vehicle telephone room is mainly composed of a noise controller 1, an amplifier 2 and a speaker 3.

The noise controller 1 is a device that emits a secondary sound having a single frequency and intensity that is created by analysis in advance. The secondary sound transmitted from the noise controller 1 is created and stored as follows.

For a running line section of a railway vehicle in which an active noise reduction system is installed, noise near a telephone in a vehicle telephone room is measured in advance, and the noise is decomposed into sine waves of a single wavelength by frequency analysis. From within, find a single waveform of the average of the main frequencies and intensities of the noise that interferes with the call.

The noise controller 1 stores the secondary sound having a single waveform found by frequency analysis and an antiphase secondary sound that is 180 ° out of phase. When the in-car telephone is used, the secondary sound of the opposite phase stored in the noise controller 1 is transmitted from the noise controller 1.

The amplifier 2 is connected to the output side of the noise controller 1 and amplifies a main single waveform of noise input from the noise controller 1 and a secondary sound having an antiphase.

The speaker 3 is connected to the amplifier 2, and outputs the antiphase secondary sound amplified by the amplifier 2 toward the vicinity of the telephone 4 in the telephone room provided in the rail car, for example, the lower portion of the telephone 4. It is installed in.

Next, the operation of the apparatus will be described. When the in-vehicle telephone is used, the antiphase secondary sound emitted from the noise controller 1 and amplified by the amplifier 2 is sent out from the speaker 3 toward the vicinity of the telephone 4 in the vehicle telephone room, so that a call near the telephone 4 is made. The sound wave of a single waveform, which is the main noise causing noise, is canceled by the secondary sound of the opposite phase, and the noise level near the telephone 4 is reduced.
Therefore, the telephone call on the telephone 4 of the vehicle is less likely to be disturbed by noise, and the telephone call can be performed in a state in which it is much easier to hear than the conventional case.

Further, in the device of this embodiment, since it is sufficient to send a secondary sound of a constant frequency having a phase opposite to that of the main sound wave having a single waveform, which interferes with a telephone call, to the vicinity of the telephone 4, it is possible to use the conventional method. The number of parts is smaller than that in the case of the active silencer, and the device can be reduced in size and weight with a simple configuration, and the manufacturing cost of the device can be reduced. Therefore, without significantly increasing the vehicle weight,
It is possible to make it easier to hear a call in the vehicle telephone room.

The noise controller 1, the amplifier 2, and the speaker 3 in the above-described embodiment are downsized, and a muffling device composed of these connections is set in the telephone main body or the handset of the vehicle telephone room, and the speaker 3 is installed.
Alternatively, the secondary sound of the opposite phase sent from may be directed toward the face of the person talking. With this configuration,
Since the muffler set in the main body of the telephone or the handset is small and lightweight, the weight of the vehicle is further reduced, and the appearance of the muffler-equipped telephone 4 installed in the vehicle is smart in design. Can be

[0018]

Since the present invention is configured as described above, it has the following operational effects.

(1) In the active muffler for a vehicle telephone room according to claim 1, of the noise transmitted to the vicinity of the telephone in the vehicle telephone room, it is opposite to the main single-wave sound wave that interferes with the call. The secondary sound of a single waveform that forms a phase is emitted from the noise controller, and the secondary sound amplified by the amplifier is sent out from the speaker toward the vicinity of the vehicle phone, so it is possible to avoid It is possible to reduce the main noise level of the noise to the extent that it does not interfere with the telephone call, and to make the telephone call of the railway vehicle in an easily audible state.

In addition, since this muffler lowers the noise level only in a limited space near the telephone by the secondary sound of a constant frequency with an antiphase sent from the speaker, the structure is simple and the manufacturing cost is low. By using such a small and lightweight active silencer, it is possible to easily make a call in the vehicle telephone room without significantly increasing the vehicle weight.

(2) In the active noise control system for a vehicle telephone room according to a second aspect, the noise controller, the amplifier and the speaker are made small and lightweight so that they can be mounted in the telephone main body or the handset of the railway vehicle. Is directed toward the face of the person making the call, so that it is possible to reduce the increase in vehicle weight and to make the appearance of the silencer-equipped telephone installed in the vehicle smart in terms of design.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

[Explanation of symbols]

 1 Noise Controller 2 Amplifier 3 Speaker 4 Telephone

Claims (2)

[Claims] 1. A noise controller that emits a sound wave for anti-phase silencing that reverses the phase of a main single-wave sound wave that interferes with a call among noise transmitted near a telephone of a vehicle, and the noise controller. An amplifier that is connected to the controller and that amplifies the single waveform silencing sound wave that is input from it, and directs the amplified anti-phase single waveform silencing sound wave that is input from the amplifier to the vicinity of the vehicle telephone. An active muffler for a telephone room of a vehicle, which comprises a speaker installed so as to send out. 2. A noise controller that emits an antiphase sound wave for canceling the phase of a main single-wave sound wave that interferes with a call among the noise transmitted near the telephone of a vehicle, and the noise controller. It is composed of an amplifier that is connected to the controller and that amplifies the sound wave for silencing of a single waveform that is input from it, and a speaker that outputs the amplified antiphase single noise frequency that is input from the amplifier. An active muffler for a vehicle telephone room, characterized in that the element is mounted in a telephone body or a handset in a telephone room of a railway vehicle, and a speaker is provided toward the face of the person who is talking.