KR200221072Y1 - Paging system wherein the sound level of paging can be automatically adjusted to noise level of surroundings - Google Patents

Abstract

The present invention relates to a guide broadcasting system in which the volume is automatically adjusted according to the level of ambient noise. When the output level of a power amplifier or the output level of a speaker exceeds a set value, the electrical signal output from the noise sensor unit is set to the output level. Maintains the state just before exceeding the set value to prevent the looping phenomenon of the sensor unit and the speaker unit and affects the S / N characteristics by using the DC input level of the power amplifier located at the final output as a control voltage without amplifying the sound source itself. Provided is a announcement system that can send a clear voice signal to the speaker without giving.

Description

Paging system where the sound level of paging can be automatically adjusted to noise level of surroundings}

The present invention relates to an announcement system. In particular, the present invention relates to a guide broadcasting system in which the volume is automatically adjusted according to the degree of ambient noise.

Announcements are often made to passengers in the terminal of a vehicle such as an aerodrome or a high-speed bus terminal, in the subway, or in the passenger compartment or station of a train. However, these places are always exposed to noise of various sizes in connection with the transportation of the vehicle or by passengers.

Conventionally, when a pre-recorded announcement is played through an amplifier or directly broadcasted by an attendant, the announcement is made according to the ambient noise level by setting the volume level to a constant size regardless of the surrounding noise. There could be cases where it could not be easily heard.

In order to solve this problem, Korean Patent Publication No. 1998-076280 discloses a method and apparatus for adjusting the volume of automatic guide broadcasting for subways. The present invention discloses a method of controlling the volume of an announcement by measuring the noise around the amplification and adjusting the volume of the announcement. In addition, Korean Patent Publication No. 1999-077067 discloses a voice guidance output level automatic control device for a vehicle navigation system. To control.

However, the above-described techniques have a looping phenomenon in which the microphone detects the speaker output signal, the voice signal is detected as noise, and repeats the reference value comparison when the output is sent to the speaker according to the comparison between the noise input into the microphone and the set reference value. This may cause a problem that the output of the speaker is continuously increased. In addition, when the output is automatically adjusted by comparing the input signal with the set value from the surrounding noise, the sound source itself is amplified, and thus the noise component included in the sound source itself is also amplified, and the signal and noise ratio (S / N) may be deteriorated. In addition, it is difficult to adjust the volume of the guide broadcast for each location of the speaker when the degree of exposure to noise is different in each vehicle where the speaker is located, as in each vehicle of the train.

The present invention is to provide a guide broadcasting system that automatically adjusts the volume according to the amount of ambient noise by sending a clear audio signal to the speaker according to the ambient noise level without affecting the S / N characteristics. In addition, the present invention is to provide a guide broadcasting system that can efficiently control a plurality of speakers exposed to places with different noise levels.

1 is a block diagram showing the interrelationship of the components of the present invention

Figure 2 is a flow chart showing the operation of the subject innovation control unit.

※ Explanation of main reference mark ※

1: preamp 6: speaker

2: tone controller 7: display

3: microphone 8: output module

4: control board 9: insulation material

5: power amplifier

By this design,

A preamplifier 1 for reproducing an audio signal at an audible frequency;

A sensor unit 3 for detecting ambient noise and converting the signal into an electrical signal;

A control unit 4 for generating a control voltage by comparing the electric signal output from the sensor unit 3 with a set noise level;

A power amplifier unit 5 for amplifying an electrical signal input from the preamplifier unit 1 according to the control voltage output from the controller 4; And

In a guide broadcasting system in which the volume is automatically adjusted in accordance with the degree of ambient noise, including a speaker unit 6 for converting the output signal of the power amplifier into a voice signal, wherein the control unit 4 is the output level of the power amplifier unit 5 or When the output level exceeds the set value provided by the guidance broadcasting system that automatically adjusts the volume in accordance with the degree of ambient noise, characterized in that it further comprises a sensor controller for adjusting the electrical signal output from the sensor unit 3 in a set manner. do.

The control unit outputs a control signal by comparing the set value with the noise signal level by the microcomputer, and the sensor control unit also adjusts the signal output from the sensor by comparing the amplifier output signal or the speaker output signal with the set value. For example, when the output level of the power amplifier or the output level of the speaker exceeds the set value, the input from the sensor is cut off or the electrical signal output from the sensor part is kept in the state just before the output level exceeds the set value. . This prevents the looping phenomenon in which the sensor unit and the speaker unit are synchronized. In the present invention, since the DC input level of the power amplifier located at the final output is used as the microcomputer control voltage without amplifying the sound source itself, a clean voice signal can be sent to the speaker without affecting the S / N characteristics. In general, the sensor unit may be provided with a directional microphone in order to detect noise in a specific direction. When the output module is configured by integrating the microphone, the speaker and / or the control unit, the manufacturing cost is low and the installation and operation are easy. It is desirable to provide insulation to prevent physical interference between the speaker and the microphone. In the case of an integral type, it can be installed as if it is a general speaker.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In preamplifier 1, the recorded voice signal is converted into an electrical signal, amplified to a certain level, and a negative feedback circuit is added to plate the frequency characteristics, thereby reproducing the recorded voice signal by extending the bandwidth to the audible frequency band. If necessary, by adding a circuit that can control the bass, mid and high pitch of the tone by the tone controller 2, the tone can be freely, and various audio signals can be output. The sensor unit 3 converts noise and noise into electrical signals using a microphone. The control unit 4 composed of the control board compares the electrical signal input from the sensor unit 3 with the noise level set through the microcomputer, and obtains a control voltage for automatically adjusting the level of guide broadcasting for each cell according to the noise level of each cell. . In other words, when the voice is output to the speaker 6, that is, when the amplifier output voltage exceeds the reference value through the microcomputer, the electric signal output from the sensor unit 3 is kept in the state just before the output level exceeds the set value. In this way, the looping phenomenon where the sensor unit 3 and the speaker unit 6 are synchronized can be prevented. According to the result obtained through the control unit, the electrical signal is amplified by the power amplifier 5, and the speaker 6 converts the electrical signal into a voice signal through the power amplifier 5. If necessary, the display 7 allows the central control system to monitor the noise level in each compartment. If output module 8 is composed of directional microphone, speaker and control circuit, it is easy to install and operate. In order to prevent physical interference between the speaker and the microphone, it is preferable to provide the insulation section 8.

This design prevents the looping phenomenon of the sensor unit and the speaker unit, and uses the DC input level of the power amplifier located at the final output as a microcomputer control voltage without amplifying the sound source itself, so it does not affect the S / N characteristics. It is possible to obtain an announcement system capable of sending a voice signal to a speaker.

Claims (2)

A preamplifier 1 for reproducing an audio signal at an audible frequency; A sensor unit 3 for detecting ambient noise and converting the signal into an electrical signal; A control unit 4 for generating a control voltage by comparing the electric signal output from the sensor unit 3 with a set noise level; A power amplifier unit 5 for amplifying an electrical signal input from the preamplifier according to the control voltage output from the controller 4; And In a guide broadcasting system in which the volume is automatically adjusted in accordance with the degree of ambient noise, including a speaker unit 6 for converting the output signal of the power amplifier into a voice signal, wherein the control unit 4 is the output level of the power amplifier unit 5 or When the output level exceeds the set value, further comprising a sensor control unit for adjusting the electrical signal output from the sensor unit 3 in a manner that the output level is set, the guidance of automatically adjusting the volume according to the degree of ambient noise Broadcasting system. The electric signal outputted when the output level of the power amplifier unit 5 or the output level of the speaker unit 6 exceeds the set value. Is maintained just before the output level exceeds a set value, and the speaker unit 6 and the control unit and / or the sensor unit 3 are automatically adjusted in accordance with the degree of ambient noise formed integrally in one unit. Announcement system.