KR200253208Y1 - An audio auto volume device that maintains the volume and volume of sound. - Google Patents

Abstract

The present invention relates to an audio auto volume for automatically adjusting the loudness of the speaker sound.

Radios, televisions, telephones, announcements in public places, etc. sometimes do not receive information due to ambient noise, and a large amount of sound in a short time of the sound signal is felt loud by the listener.

The present invention raises the volume of the speaker when the noise around the listener is high, and maintains the artificially adjusted volume when the noise is low;

Canceling the audio signal of the detected noise to prevent the continuous rise of the sound;

Setting an upper limit so that speaker sound is not too loud when the noise is too loud;

For a short time, a large amount of sound signals (commercial, background music, stadium shouts) are amplified and rectified smoothly, lowering the volume to lower the speaker sound, and maintaining an artificially adjusted volume state when the volume of the sound signal is small.

As described above, based on the volume position artificially adjusted by the listener, the speaker sounds loud when there is a lot of ambient noise;

Making the speaker sound small when the volume of the sound signal is large;

There is an effect of maintaining the listener's sensation (information content and volume of sound).

Description

An audio auto volume device that maintains the volume and volume of sound. {Omitted}

The present invention relates to an audio automatic volume for transmitting information in the sound of radio, television, telephone, announcement announcement.

The loudness of the speaker tuned to the audio volume may not be heard when there is a lot of noise around the listener, and the announcement broadcast is one-sided, and the sound is too loud when the ambient noise is small.

There is an application that detects noise, rectifies and amplifies the audio signal filter, noise signal rectification, and amplifies the automatic volume control unit (Korean Application No. 20-1998-0011867). No components have been developed, and independent electronic circuits (TR1 stage-TR2 stage) cannot perform the task of filtering a specific signal.

The loudness and noise of the audio signals are kept quiet by using a feedback circuit, but commercials, background music, and stadium shouts, which have a large amount of sound signals for a short time, are delivered to the listener through the speaker. You can enjoy inspiration by riding on a ride, but sometimes it acts as a noise and the listener feels a burden.

Install a noise-sensing microphone around the listener,

When there is a lot of noise, turn up the volume of the audio circuit to make the speaker louder,

Return to artificially adjusted volume position when the noise is low;

Cancels the audio signal out of the detected noise signals,

Prevent continuous rise of speaker sound by speaker sound (recognized as noise);

When the detected noise signal is too loud,

Set the upper limit of the auto volume circuit so that the speaker does not sound too loud.

By amplifying, rectifying and smoothing a large amount of sound signals continuously into the audio circuit, the volume is lowered to reduce the speaker sound, and when the volume of the sound signal is small, it is returned to the artificially adjusted volume position.

Based on this artificially adjusted volume position,

Loud speaker sound when there is a lot of noise around the listener;

Making the speaker sound small when a large amount of sound signal enters the audio circuit;

The purpose is to maintain the listener's sensation (information content and volume of sound).

1 is a schematic diagram of an over-the-air receiver with an audio auto volume device for automatically adjusting the volume and volume of sound;

2 is a schematic diagram of an over-the-air receiver in which an audio auto volume device is connected to a volume motor.

Fig. 3 is a schematic diagram of an over-the-air receiver in which an audio auto volume device is connected to an electronic volume bias.

<Description of the code | symbol about the principal part of drawing>

1, antenna. (ANTENNA)

2, high frequency amplification circuit.

3, microphone (TAPE, CD input terminal)

5, volume. (VOLUME)

5-1, electronic volume.

6, low frequency amplifier circuit.

7, speaker. (SPEAKER)

8, electronic volume control circuit.

9, main power (VCC).

10, automatic volume on / off switch,

11, noise detection microphone.

12, noise amplification circuit.

13, rectifier diode.

14, charging capacitor.

15, discharge resistance.

16, discharge adjustment resistance.

17, auxiliary electron volume.

18, diodes to prevent backflow.

19, volume variable motor,

19-1, variable position motor one-position spring.

21, rectifier diode.

22, charging capacitor.

23, audio signal adjustment resistance.

26, zener diodes.

27, upper limit adjustment resistance.

31, a received signal amplification circuit.

32, rectifier diode.

33, charging capacitor.

34, discharge resistance.

35, discharge adjustment resistance.

36, signal inversion circuit.

37, signal inversion circuit bias resistor.

The sound signal input through the antenna (1) and the microphone (3) is artificially adjusted in volume by the volume (5) (5-1), and amplified by the amplification circuit (2) (6) to make the speaker (7) With a driving air receiver (audio), the listener hears sound information.

When there is a lot of noise around the listener, the noise detected by the noise sensing microphone 11 is amplified by the noise amplifier circuit 12 and smoothed by the rectifying diode 13 and the charging capacitor 14 so that the voltage charged in the charging capacitor 14 is increased. The bias of the auxiliary electron volume 17 connected in parallel to the volume 5 is raised to make the speaker 7 loud and maintained,

When the noise is small, the discharge is controlled through the discharge regulating resistor 16 and the discharge resistor 15 to lower the bias of the auxiliary electron volume 17 so that the loudness of the speaker 7 maintains the state of the artificially adjusted volume 5. do.

The audio signal of the low frequency amplification circuit 6 is rectified and smoothed by the rectifying diode 21 and the smoothing capacitor 22 to adjust the amount of speaker sound of the noise + spurker sound entering the noise sensing microphone 11 with the adjusting resistor 23. By lowering the bias of the noise amplification circuit 12 (offset), the speaker sound is recognized as noise to prevent the speaker from continuously rising.

The zener diode 26 upper limit adjustment resistor 27 bypasses a certain portion or more when the noise signal charged to the charging capacitor 14 is too large, so that the speaker sound becomes too loud when the detected noise 11 is too large. Prevent the phenomenon

The voltage charged in the charging capacitor 33 by amplifying a large amount of sound signals introduced through the antenna 1 and the microphone 3 into the signal amplifier circuit 31 and smoothing the rectifying diode 32 charging capacitor 33 is By lowering the bias of the low frequency amplifier circuit 6, the sound of the speaker 7 is reduced,

When the volume of the sound is small, when the voltage charged in the charging capacitor 33 is lowered by discharging through the discharge resistor 34 and the discharge regulating resistor 35, the low frequency amplification circuit 6 bias is returned to its original position. The size of keeps the state of the artificially adjusted volume (5).

Fig. 2 amplifies 12, rectifies 13, and smooths 14 the sensed noise 11 and connects it to the volume variable motor 19, raising the volume 5 when the noise is loud and raising the volume when the noise is small. In the state of the volume 5 artificially adjusted by the variable motor spring 19-1;

A large amount of sound signals (1) and (3) are amplified (31), rectified (32), smoothed (33) and connected to the volume variable motor (19) to lower the volume (5) when the volume of sound is high, When the amount of is small, it is returned to the state of the volume 5 artificially adjusted by the volume variable motor spring 19-1.

FIG. 3 illustrates that the detected noise 11 is amplified 12, rectified 13, and smoothed 14 to be connected to a bias of the electron volume 5-1 through a backflow prevention diode 18 to generate an electron when the noise is high. Raise the volume 5-1 and maintain the artificially adjusted electronic volume adjustment signal 8 when the noise is low, and the large amount of sound signals 1 and 3 are amplified 31 and rectified 32 Connected to the bias of the electronic volume 5-1 through the smoothing 33 and the signal inversion circuit 36 to lower the electronic volume 5-1 when the volume of sound is high and artificially adjust when the volume of sound is small. Maintain the state of (8).

A large amount of sound signals (1) and (3) among the circuit arrangements described above is the signal inversion ratio of the audio main circuits (5), (6), (7) and the sound attenuation circuits (31) (32) (33) (34). To adjust the phase.

According to the present invention as described above by detecting the ambient noise of the listener,

When there is a lot of noise, raise the audio output to make the speaker louder,

When the noise is low, it is returned to the artificially adjusted volume position;

Preventing the rise of speaker sound caused by the speaker sound detected along with the noise;

Make sure the speaker sound is not too loud when the detected noise is too loud;

Maintain the listener's sensation (information)

When a large amount of sound signal enters the audio circuit, reduce the speaker sound,

Reposition to artificially adjusted volume position when the volume of sound signal is small;

It has the effect of maintaining the listener's sensation (sound volume).

Claims (5)

A noise sensing microphone 11 is installed around the listener to amplify the detected noise through the noise amplifier circuit 12 and smooth the rectification diode 13 and the charging capacitor 14 to charge the voltage charged in the charging capacitor 14. 5) The bias of the auxiliary electron volume 17 connected in parallel is increased to increase and maintain the sound of the speaker 7, and when the noise is low, it is discharged through the discharge adjusting resistor 16 to bias the auxiliary electron volume 17. Lowering the sound of the speaker 7 to maintain the state of the artificially adjusted volume 5; A large amount of sound signals introduced through the antenna 1 and the microphone 3 are amplified by the signal amplifier circuit 31 and smoothed by the rectifying diode 32 charging capacitor 33 to lower the bias of the low frequency amplifier circuit 6. When the volume of the speaker 7 is reduced and maintained, the volume of the speaker 7 is artificially adjusted by discharging it through the discharge adjustment resistor 35 to return the bias of the low frequency amplifier circuit 6 to its original position. Automatic volume device to maintain the state of the volume (5). The noise signal 11 sensed through the microphone by applying rectification and smoothing to the bias of the noise amplification circuit 12 by rectifying and smoothing the audio signal of the low frequency amplification circuit 6 to the rectifying diode 21. Automatic volume device that cancels the sound part of the speaker (noise + speaker sound) and adjusts the volume (5) only by the noise signal. The automatic volume of claim 1, wherein too loud noise of the detected noise signals 11 is bypassed by the zener diode 26 and the adjusting resistor 27 to prevent the loud sound of the speaker 7 to set an upper limit of speaker sound. Device. The method of claim 1, wherein the voltage charged in the charging capacitor 14 and the charging capacitor 33 is connected to the volume variable motor 19 to raise and lower the volume 5, thereby automatically adjusting the volume of the sound of the speaker 7. Volume device. The voltage of the charging capacitor 14 and the charging capacitor 33 is connected to the bias of the electronic volume 5-1, the electronic volume 5-1 is raised and lowered, and the sound of the speaker 7 Automatic volume device to adjust the size of the.