JPH1120697A - Public addressing method for railway rolling stock and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separately control each speaker by providing a preamplifier for public addressing for every vehicle, incorporating a power amplifier for every speaker box, operating a speaker as a microphone and performing a sound volume setting by relating the setting to car inside noise. SOLUTION: A public address starting is set by a public address starting SW, public address sound produced from a microphone for public addressing is amplified by a public address controller, public address sound is amplified by a preamplifier via a circuit for car inside public address and the public address sound is delivered to a speaker box 6 at each vehicle. A speaker box 6 is constituted of a power amplifier 7 and a speaker 8. After sound is amplified in the power amplifier 7, sound is delivered from the speaker 8. Car inside noise (b) enters from the speaker 8, a subtraction is performed by public address sound (a) and a subtraction amplifier 22 and only car inside noise (b) is amplified. The level of a public address signal to be inputted in a transistor 21 by amplification is controlled in responce to the car inside noise. Thus, sound volume can be automatically adjusted for every installation location of the speaker 8 within the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to in-vehicle broadcasting of railway cars and the like, and more particularly, to a broadcasting method for vehicles such as railways provided with a broadcasting system of a distributed system and an apparatus thereof.

[0002]

2. Description of the Related Art As a conventional in-vehicle broadcast, there is, for example, a loudspeaker in a train disclosed in Japanese Utility Model Publication No. 29-17204. This broadcast is characterized in that power amplification corresponding to a vehicle speaker is separately provided for each vehicle, and the power amplifiers of all vehicles are driven by a common voltage amplifier.

[0003] More specifically, as shown in FIG. 8, when the loudspeaker is to be operated, the vehicle (A)
When the operation switch of the controller of the car is turned on, the power of the amplifier 37 in the controller is turned on, and at the same time, the microphone speaker previously connected to the U line is connected to the in-car broadcast switch 34 so that the output of the amplifier 32 is output. It is connected to the L line through the in-vehicle broadcast switch 34. Then, when the power amplifier power switch 38 is turned on, the power of the power amplifiers of all vehicles (a, b, c, etc.) is turned on. On the other hand, since the microphone speaker of the car B is directly connected to the U line, the operation switch 3 of the controller of the car A
7b In-vehicle broadcast switch 34 and communication switch 33
To the input of the amplifier 32. Further, since the microphone speaker 35 of the car A is connected to the output side of the amplifier 32 through the switches 33 and 34, if the user speaks toward the microphone speaker 39 of the car B, the microphone speaker 3 of the car A
5 can be operated as a speaker to talk from car B to car A. Further, when answering or speaking from the car A to the car B, it is sufficient to press the communication switch 33 and speak to the microphone speaker 35. In this case, the communication switch 33 connects the microphone speaker 35 to the input of the amplifier 32 and connects the microphone speaker 43 to the output of the amplifier 32.

Further, a conventional in-vehicle broadcasting device relating to the in-vehicle broadcasting mechanism of the present invention will be described with reference to FIGS.
In a conventional in-vehicle broadcasting device, Japanese Utility Model Publication No. 29-1720
As described in No. 4, a distributed broadcasting apparatus is predominant, and all speakers in a vehicle are driven by one power amplifier installed for each vehicle. That is, as shown in FIG. 9, first, the broadcast start switch 52 is set to start broadcasting, thereby turning on the relay of the broadcast control device (A) and transmitting the broadcast signal to the in-vehicle broadcast line 54 through the relay contact. At the same time, the power supply Vcc for broadcasting activation is transmitted to the broadcasting activation line 53 by the broadcasting activation SW 52, and further, the relay 58 of the broadcasting device 55 of each vehicle is activated, and the power amplifier 56 and the in-vehicle speaker 59 are connected by the relay contact 57. To start broadcasting. To end the broadcast, the broadcast activation SW5
If 2 is turned off, the relay A is also turned off and the broadcast is cut off. Further, as shown in FIG. 10, there is a case where the broadcast apparatus is the same as the above, but is activated using the in-vehicle broadcast line 54 without possessing the broadcast activation line 53. In this case, the broadcast control device side and the broadcast device side use the transformer 60 and the transformer 61 to start broadcasting on the in-vehicle broadcasting line 54. Also, a center tap is provided on the in-vehicle broadcast line side of the transformer 60 and the transformer 61, and a power supply Vcc for starting the broadcast is transmitted to the center tap, so that the relay 58 on the broadcast device side can be turned on to broadcast. Has become.

[0005]

An object of the present invention is to provide an in-vehicle broadcasting system which has been considered impossible by improving such a conventional broadcasting device for a railway vehicle or the like. In other words, the conventional broadcasting system of the distributed system includes one broadcasting device for each vehicle, and the device sounds a speaker in each vehicle. Therefore, in this system, it is not possible to adjust the volume of details in the vehicle, and when the vehicle is separated into private rooms like a sleeper, the broadcast volume and the presence / absence of broadcast are required. Therefore, there is a problem to be solved by the present invention to provide a broadcasting device capable of controlling individual speakers independently in order to solve these problems.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and is directed to an in-vehicle broadcasting method for a vehicle such as a railway equipped with a distributed broadcasting device.
To provide an in-vehicle broadcasting method that includes a preamplifier for broadcasting for each vehicle and incorporates a power amplifier for each speaker box, and operates the speaker as a microphone to set the volume in relation to noise in each vehicle, Also, there is provided an in-vehicle broadcasting method in which a power amplifier incorporated in the speaker box is provided with an individual address circuit to control the volume control or the presence or absence of broadcasting for each speaker box.

Further, a broadcast audio signal is superimposed on DC power supplied from a broadcast preamplifier installed in each vehicle to a speaker box having a built-in power amplifier, and the power and broadcast audio signal are transmitted to the power amplifier. In the provision of an in-vehicle broadcasting device to be supplied, the noise in the vehicle is detected in each of the speaker boxes, and the amplification degree of the power amplifier is changed by the detection signal. An in-vehicle broadcasting device equipped with an automatic volume control device to be controlled, further comprising an address circuit that can be individually identified for each of the power amplifiers, and individually operating the individual power amplifiers by the address designation. In-vehicle broadcasting device that can.

[0008] That is, a means for solving the problem of the present invention is to provide a conventional distributed broadcasting system, in which one preamplifier is provided in a vehicle and a power amplifier is built in a speaker box. In the same manner as above, the speaker operates as a microphone in the speaker box to detect noise near the speaker installation, and further sets the amplification degree of the power amplifier based on the detection signal. By setting the amplification degree, the sound volume can be set to be related to the noise, so that the sound volume can be set finely and precisely in the vehicle. Further, by giving individual addresses to the power amplifiers incorporated in the individual speaker boxes, it is possible to control the volume and control the presence or absence of broadcasting on a speaker box basis.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention relates to an in-vehicle broadcasting method for a vehicle such as a railway equipped with a distributed broadcasting system, in which a preamplifier for broadcasting is provided for each vehicle and an electric power is supplied to each speaker box. This is an in-vehicle broadcasting method in which an amplifier is incorporated and the speaker operates as a microphone to set the volume in association with the noise in each car. Each power amplifier incorporated in the speaker box is provided with an individual address circuit. Since this is an in-vehicle broadcasting method in which the volume is adjusted or the broadcast is controlled on a box-by-box basis, it is possible to set detailed and detailed volume in the vehicle, which cannot be obtained by the conventional method.

Further, according to an embodiment of the present invention, a broadcasting pre-amplifier and a power amplifier are provided for each speaker box in a broadcasting device installed for each vehicle, and a direct current supplied from the pre-amplifier to the power amplifier is provided. An in-vehicle broadcasting device that superimposes a broadcast audio signal on power and supplies power to a power amplifier, and detects noise in the vehicle in each of the speaker boxes and converts the amplification of the power amplifier with the detection signal. Further, the present invention is an in-vehicle broadcasting device equipped with an automatic volume control device for controlling broadcast sound in accordance with the noise in each vehicle, and further includes an address circuit that can be individually identified for each of the power amplifiers, and is provided with the address designation. Since this is an in-vehicle broadcasting device in which individual power amplifiers can be operated individually, it is possible to reduce the size and weight, which were not obtained with the conventional device, and to reduce the power consumption. It can be achieved in the strike of.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a broadcast apparatus for a railway vehicle according to the present invention. First, the broadcast start is set by the broadcast start SW 2, the broadcast sound output from the broadcast microphone 1 is amplified by the broadcast control device (A), and further transmitted via the in-vehicle broadcast line 4 by the preamplifier 5 of each vehicle. It is amplified and sent to the speaker box 6 in each vehicle. The speaker box 6 includes a power amplifier 7 and a speaker 8, and after being amplified to a predetermined volume by the power amplifier 7, sound is transmitted from the speaker 8 as broadcast sound. In the conventional dispersion method, since a single broadcasting device drives several speakers, an amplifier having a large output power is required, and considerable heat is generated. Therefore, it has been difficult not only to assemble the device in a small size and light weight but also to increase the cost. On the other hand, since the power of the power amplifier according to the present invention can be reduced to one-third of the total number of vehicle speakers of the conventional power amplifier, the size can be considerably reduced, and the cost can be reduced in view of the mass production effect. it can.

FIG. 2 shows a power amplification system of the apparatus of the present invention. This shows a power supply method for operating the power amplifier 7, and in the case where a speaker box having the power amplifier 7 of the present invention is directly installed at a place where a conventional speaker is installed, a preamplifier 5 is used. The broadcast signal is superimposed on the speaker line 15 from the power supply 11 and sent to the speaker box 6.
That is, the broadcast signal amplified by the preamplifier 5 is superimposed on the direct current of the power supply 11 via the capacitor 14 and transmitted to the speaker line 15. At this time, when superimposed with the DC of the power supply 11, the DC power is superimposed via the transformer 13, thereby increasing the AC impedance of the power supply to reduce the loss of the broadcast signal. Only the broadcast signal of the superimposed signal sent to the speaker box 6 via the speaker line 15 is sent to the power amplifier 7 by the audio signal capacitor 17. Further, the direct current is transmitted through the transformer 16 to the power amplifier 7.
And power is supplied from the speaker 8 to generate sound from the speaker 8.

FIG. 3 shows a broadcasting apparatus according to the present invention having an address function and an example of the configuration of the address function. On the broadcast control side, the broadcast control device (A) includes an address circuit (B), while on the broadcast device side, the speaker box (6) includes an address circuit B2. And
As shown in FIGS. 4 and 5, when an address designation SW of a place where broadcasting is desired is selected, address data D1 to Dx are transmitted from the address generation circuit. This is converted into serial data by a serial / parallel converter 6 and further sent to the speaker box 6 via the in-vehicle broadcast line 4. On the other hand, the waveform is shaped by the waveform shaping circuit of the address circuit (B2), the address data is parallel-converted by the serial / parallel converter, and further compared with the self-address by the comparing circuit to make the transmission address and the self-address the same. In this case, the power amplifier 7 and the loudspeaker 8 are connected by a relay contact and are set to be in a broadcastable state. According to the device of the present invention, even in a vehicle having a private room by subdividing the vehicle, a speaker installed in each private room can be selected and broadcast.

FIGS. 6 and 7 show a broadcasting apparatus having an automatic volume control function according to the present invention. In FIG. 6, the broadcast signal input from the speaker line 18 is power-amplified by the power amplifier 7 and the broadcast sound (a) is output to the speaker 8. On the other hand, the in-vehicle noise (b) is always inputted from a speaker and becomes a signal of (a) + (b), which is subtracted from the broadcast sound (a) by the subtraction amplifier 22 to produce the in-vehicle noise (b).
Only amplified. By this amplification, the level of the broadcast signal rectified by the diode 23 and input to the transistor 20 constituting the resistor 20 and the attenuator is controlled in accordance with the vehicle interior noise. That is, when the noise inside the vehicle is high, the broadcast volume can be increased to broadcast. Further, FIG. 7 shows that when the broadcast signal is present, the output of the power amplifier 7 is rectified by the diode 26 and the transistor 25 is turned on.
N, while turning off the transistor 28, a broadcast sound can be output from the speaker 8. When there is no broadcast sound, the transistor 25 is turned off, the transistor 28 is turned on, the vehicle interior noise enters from the speaker 8, is amplified by the amplifier 30, is rectified by the diode 23, and forms a resistor 20 and an attenuator. By controlling the transistor 21, the broadcast volume can be adjusted.

As described above, in the conventional broadcasting device, only a rough volume adjustment can be performed for each vehicle. However, according to the device of the present invention, the volume of the speaker is automatically and finely adjusted for each speaker installation position in the vehicle. It becomes possible to adjust it.

[0016]

Since the present invention is configured as described above, it has the following many effects. A. In a conventional distributed broadcasting system, a single broadcasting device sounds a speaker in a vehicle for each vehicle.
In this method, it is not possible to adjust the volume of details in the vehicle, and if the vehicle is composed of a private room such as a sleeper, the broadcast volume and the presence / absence of broadcast are required. Thus, each speaker can be controlled independently. A. The present invention is a broadcasting system of a distributed system, in which one preamplifier is provided in a vehicle and a power amplifier is built in a speaker box to drive a speaker. Similarly, a speaker is used as a microphone in a speaker box. When activated, the noise near the speaker installation can be detected, and the amplification level of the power amplifier can be set based on the detection signal, so that the volume can be set to be related to the noise. Fine volume can be set. C. By giving individual addresses to the power amplifiers incorporated in the individual speaker boxes, it is possible to control the volume control and the presence or absence of broadcasting in speaker box units. D. In the conventional dispersion method, since a single broadcasting device drives several speakers, an amplifier having a large output power is required, and considerable heat is generated. Although the cost is high, the power of the power amplifier according to the present invention can be considerably reduced because the power of the conventional power amplifier is only one part of the total number of vehicle speakers, and the cost is reduced in view of the mass production effect. Can also be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a mechanism of an in-vehicle broadcasting device according to the present invention.

FIG. 2 is a schematic diagram of a power amplifier system of the device of the present invention.

FIG. 3 is an address function configuration diagram of the device of the present invention.

FIG. 4 is an address generation circuit diagram of the device of the present invention.

FIG. 5 is an address data comparison circuit diagram of the device of the present invention.

FIG. 6 is an automatic volume control function diagram of the device of the present invention.

FIG. 7 is an automatic volume control function diagram of the device of the present invention.

FIG. 8 is a schematic diagram of a conventional in-vehicle broadcasting device function.

FIG. 9 is a schematic diagram of a conventional in-vehicle broadcasting device function.

FIG. 10 is a schematic diagram of a conventional in-vehicle broadcasting device function.

[Explanation of symbols]

1 Broadcasting microphone 2 Broadcast activation S
W 3 Broadcast start line 4 In-car broadcast line 5 Preamplifier 6 Speaker box 7 Power amplifier 8 Speaker 9, 10 Relay 11 Power supply 12 Power amplifier 13, 16 Transformer 14, 17 Capacitor 15, 18 Speaker line 19, 30 Amplifier 20 Resistance 21 , 25, 28 Transistor 22 Subtraction amplifier 23, 26 Diode 24, 29 Capanta 27 Inverter 31, 41 Power amplifier 32, 40 Voltage amplifier 33 In-vehicle communication switch 35, 39 Microphone speaker 36 In-vehicle speaker 37 Operation switch 38 In-vehicle broadcast switch 51 Broadcast microphone 52 Broadcast start SW 53 Broadcast start line 54 In-vehicle broadcast line 55 Broadcasting device 56 Power amplifier 57, 58 Relay 59 In-vehicle speaker 60, 61 Transistor (A) Broadcast control device (B ) Address circuit

Claims (5)

[Claims] 1. An in-vehicle broadcasting method for a vehicle such as a railway provided with a distributed broadcasting device, comprising: a preamplifier for broadcasting for each vehicle; and a power amplifier for each speaker box; An in-vehicle broadcasting method for a vehicle such as a railway, which operates as a microphone and sets a volume in association with noise in each vehicle. 2. The broadcasting method for a vehicle such as a railway vehicle according to claim 1, wherein the power amplifier incorporated in the speaker box is provided with an individual address circuit to control the volume control or the presence or absence of broadcasting for each speaker box. 3. A broadcast pre-amplifier and a power amplifier for each speaker box are installed in a broadcasting device installed for each vehicle, and a broadcast audio signal is converted into DC power supplied from the pre-amplifier to the power amplifier. And a power amplifier for supplying power to the power amplifier. 4. Automatic volume control for detecting noise in a vehicle in each speaker box, converting the amplification of a power amplifier by the detection signal, and controlling broadcast sound in accordance with the noise in each vehicle. The broadcasting device for vehicles such as railways according to claim 3, wherein the broadcasting device is mounted. 5. The vehicle according to claim 3, further comprising an address circuit that can be individually identified for each of the power amplifiers, and each of the power amplifiers can be individually operated by the address designation. Broadcast equipment.