JPS5911018A - Automatic sound volume adjusting device - Google Patents

Abstract

PURPOSE:To listen to an external noisy sound in a car under close confinement by attenuating the sound of audio equipment when the external noisy sound takes place for a prescribed time and enabling the external noisy sound to be acoustically outputted. CONSTITUTION:When a detecting section 21 detects the external sound with a switch 36 turned on and the noisy sound takes place for a prescribed time, a control section 30 transmits a control signal to an attenuator 31 and a gate 35. The gate 35 is turned off when no control signal from the control section 30 is applied and the signal of the detecting section 21 is not transmitted to the post-stage. When the control signal is applied to the gate 35, the gate 35 is turned on, the signal of the detecting section 21 is applied to an amplifier 34, where the sound is outputted acoustically. On the other hand, the signal from the sound equipment 32 is outputted by being attenuated sufficiently through the operation of the attenuator 31. Thus, when the external sound such as siren of patrol car takes place, the output of the equipment 32 is attenuated and the external sound such as siren is amplified and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sound N adjustment device that automatically adjusts the volume of external and acoustic signals.

The present inventor previously proposed the device shown in FIG. 1 as this type of device.

1. The 21-digit detection unit consists of a microphone, etc.
The detection section 21 is connected to a NoTCH circuit 22. A level detector 23 is arranged after the front H+2 N Q T C) L circuit 22, and after the level detector 23 there is an R E F circuit section 25 that generates a reference voltage and a voltage 1 generated from the level detector 23. Comparator 2 to compare with @2 pressure
4 is placed.

The output uO8M from the comparator 24 is branched into a circuit that passes through a one-shot multi (one-shot multi) circuit section 26 and a pulse generation circuit section 28, and a circuit that connects 11 and inputs it to an A N D circuit 27.

After the AND low 11 27, an O8M circuit 29,
A control section 30XATi' circuit section 31 is arranged. Also, it is a sound equipment such as a 32-digit car stereo.

Next, the operation will be briefly explained.

Detection+! External noise is picked up by B 21, and here the frequency of the alarm sound generated by emergency exit cars, etc. is assumed to be A (! You may also output a constant frequency of 4'l as a pilot signal for each one.) The characteristics of the NoTCH circuit 32 are set so that the frequency A passes through.

IFh that passed y1 through the N 01' CfLM path 32
The constant frequency A, No. 46, is converted into a level detector hX1It current voltage by the level detector 23. This level is detected and compared with the reference vehicle pressure signal generated by REF 25 by converter 24.

With the above configuration, when an emergency vehicle approaches, or when it is heading in all four directions at the same speed, the comparator 24 (iF) is generated. (This is the so-called Doppler effect, and when a sound source approaches The frequency increases to
The frequency will decrease as you move away. ) Next, the output signal from the comparator 24 is branched into a circuit consisting of an O8M circuit section 26 and a pulse generation circuit section 28, and a circuit that can be directly input to the comparator 27.

First, the O8M circuit section 26 detects the rise of the signal generated from the comparator 24 and generates a pulse for a certain period of time. The pulse generator that generates a pulse at the falling edge of the pulse generated by the OS M circuit section 26 is an O8M.
The circuit section 26 inputs the signal to the A I'J D circuit 27 after a certain period of time has elapsed.

Here, the ANJJ circuit 27 receives a signal inputted from the comparator 24 and a signal inputted from the pulse generator.

In other words, the current signal is compared with the signal obtained by processing the signal for a certain period of time using the above configuration, and the signal is pulsed for a certain period of time.
It is set to operate when the U Shinkyu is input properly. In other words, Q, it's an emergency (5.j is fixed 111.
'i;7; l I sold splicing threads and picked them up, and it turned out to be 21 pieces in operation.

U! , the signal I″108M108 from the AND circuit 27
M circuit 9 K input ζshi1. The control section 30 is actuated by a pulse generated by the X08M circuit section 29, and the ATT is turned on and off. As a result, the output of the audio device rj, 32 is reduced.

Figure 3 is earth delivery! The timing waveform of 1ν1 operation is shown, and the same figure shows the state where IC, +21.+31 digit 08M29 is activated and the signal is attenuated,
) and (6) indicate a state where the attenuation is not complete.

In such a tI formation, the detection unit 21 detects the constant I+
,, (When no noise is detected, the device 32 can be attenuated. For example, if there is a noise inside the car, turn on the cooler or heater, close the window, and turn on the V'R.
When in indoor conditions, it is difficult to hear the sounds of rescue vehicles, fire trucks, police cars, etc. due to external noise.
Or something terrible happened.

Therefore, this invention was made to eliminate the above-mentioned problems, and the external noise (sound when generated for a certain period of time) weakens the device, and the external noise
This is the output of the noise into a bowl.

FIG. 3 shows an embodiment of the present invention, with parts 2 and 1 identical to FIG.
The same name is used.

The output of the detection section 21 is input to the gate 35 via the switch 36. Switch 36 is a manually operated switch. The output of the gate 35 is connected between the attenuator 31 and the amplifier 34 of the audio equipment 32. Gate 35 Ministry (j
The terminal is connected to the output of the control section 30.

Now, the switch 36 is set to 1.4, and the output section 21 detects external noise with the detection section 21, and the signal shown in Fig. 42 (
1) - (S3) During the period in which the size indication timing occurs, the time period when evening noise occurs (+ti1 part 30 sends out ?ll1j Gohakugo to the attenuator 31 and gate 35. The gate 35 may be the control part 30. When the control signal is applied,
When it is not present, it is off, and the detection i'ils 21 No. 11j is not sent to the subsequent stage. When the :fi control signal V→ is applied to the gate 35, the gate;
1, the output is outputted in the 11th, acoustically.

- Power, sound - No. 3 &: I: , Attenuator, 31 made 1 error, lf-min. thickened 1. output]. If you do not want to absorb external noise, you can turn off the switch 36.

・This shows another embodiment of "You 4 Figure 11", in which the output of the gate 35 is amplified by the amplifier of the audio equipment 32, so instead of inputting it to the external noise amplifier 37 separately. This is the output from the speakers.

As described above, according to the present invention, when a police car's siren or the like is generated from the outside, the siren or the like is amplified and output along with the sound L6 (the counter output is 'lf!, attenuated). 4) ■) You can hear external noises such as sirens even when you cannot hear them directly, such as inside a car.

[Brief explanation of drawings]

Fig. 1 shows the device already proposed; Fig. 2 e, 1' shows a timing chart of each part of Fig. 1; Figs. 3 and 4 each show an embodiment of the present invention. . 21...Detection section 22...N
OT Cf123・・・Level detector
Filter 24...Comparator 26.29... Nest stabilizing multi 30...1tjlJ 8 parts 31...
・・Attenuator 32・・・・・Sound t# device 34
......Amplifier 35...Gate 3
6... Switch patent applicant Pioneer Corporation Figure 2 Figure 3

Claims (1)

[Claims] a detection means for detecting external noise; a comparison means that operates when the output of the detection means exceeds a predetermined value; a detection means for detecting whether the output of the comparison means exists after a predetermined period of time has elapsed; An automatic volume adjustment device comprising: signal control means for attenuating an acoustic signal activated by the output of the Nu detection means and acoustically outputting the external noise.