KR19990069839A - ECHO and tone control method of A / V system - Google Patents

Abstract

A voice input unit for converting and amplifying a human voice into an electrical signal, amplifying it, an echo processing unit for receiving an amplified signal output from the voice input unit and echo processing, an A / V switch for switching music signals and various sources; And a signal detector for receiving the music signal switched from the A / V switch and various sources and outputting a detection signal, and receiving the switching signal output from the A / V switch and the echo signal output from the echo processor. A mixing unit, a tone control unit configured to receive a mixed signal from the mixing unit, and perform tone control, a speaker receiving a control signal output from the tone control unit, and converting an electrical signal into sound, from the signal detection unit It consists of a microcomputer that controls the echo processing unit, tone control unit and A / V switch by receiving the detection signal. By automatically controlling the color it is possible to improve the inconvenience of a user having to control the amount of echo and voice.

Description

A / V system echo and timbre control method

The present invention relates to a microphone, and more particularly, to a method of controlling echo and timbre of a microphone to determine whether a music signal is present and to control echo and timbre only when there is a music signal.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram showing an audio output control apparatus of an A / V system according to the prior art.

As shown in FIG. 1, a microphone 1 for converting a human voice into an electrical signal, a microphone amplifier 2 for amplifying a signal output from the microphone 1, and an amplification in the microphone amplifier 2 Mixing the output of the echo processing section with an echo processing section 3 for echo-processing the signal, an A / V switch 4 for switching music signals and various sources, and a signal selected from the A / V switch 4 A mixing unit 5, a tone control unit 6 for controlling the tone of the signal mixed by the mixing unit 5, a speaker 7 for converting the electrical signal output from the tone control unit 6 into sound, It consists of the microcomputer 8 which controls the whole system.

In the microphone 1, the human voice is converted into an electrical signal, and this signal is so small that it is amplified by 50 to 100 times in the microphone amplifier 2 to the desired signal level.

The amplified signal is subjected to echo processing by the echo processing section 3, and the mixing section 5 mixes the signal selected by the A / V switch 4 with the output signal of the echo processing section 3.

The signal mixed in the mixing section 5 is amplified to a size sufficient to drive the speaker in the tone control section 6 and reproduced as sound in the speaker 7.

When the microphone according to the prior art is used, the echo amount is operated by the set value, and there is an inconvenience in that the user needs to reset the echo amount when delivering a lecture or any information except when using a song to sing.

The present invention has been made to solve such a problem, it is possible to always use the microphone in an optimal state by automatically controlling the echo and tone according to the purpose of use.

1 is a block diagram showing a voice output control apparatus of the A / V system according to the prior art

2 is a block diagram showing an audio output control apparatus of the A / V system according to the present invention

3 is a detailed view illustrating the signal detection unit of FIG.

4 is a flow chart showing a voice output control method of the A / V system according to the present invention

5 shows frequency vs. amplification

Explanation of symbols for main parts of the drawings

11: microphone 12: microphone amplifier

13 echo processing unit 14 A / V switch

15: signal detection unit 16: mixing unit

17: tone control unit 18: speaker

19: micom

The present invention relates to an A / V system, comprising: a voice input unit for converting and amplifying a human voice into an electrical signal, an audio processing unit for echo processing an amplified signal output from the voice input unit, a music signal, and various An A / V switch for switching a source, a signal detector for receiving a music signal and various sources switched by the A / V switch, and outputting a detection signal, and a signal switched by the signal detector and the A / V switch And a mixing unit that receives and mixes an echo signal that is an output of an echo processing unit, a tone control unit that controls a tone by receiving a signal mixed by the mixing unit, and a speaker that converts an output signal of the tone control unit into sound. And a microcomputer that receives the detection signal from the signal detector and controls the echo processor, the tone controller, and the A / V switch.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a block diagram illustrating an echo and tone control apparatus of an A / V system according to the present invention, FIG. 3 is a block diagram showing the signal detection unit shown in FIG. 2 in detail, and FIG. 4 is an A / V signal according to the present invention. This flowchart shows how to control the echo and timbre of the system.

Referring to FIG. 2, a voice input unit 10 including a microphone 11 for converting a human voice into an electrical signal, a microphone amplifier 12 for receiving and amplifying the electrical signal output from the microphone 12, and An echo processing unit 13 for echo processing the amplified signal output from the microphone amplifier 12, an A / V switch 14 for switching music signals and various sources, and switching in the A / V switch 14 Signal detection unit 15 for detecting the presence of a signal to receive a signal and outputs a detection signal to the microcomputer 19, and the output from the switched signal and the echo processing unit 13 output from the A / V switch 14 Mixing unit 16 for receiving and mixing the echo processing signal to be input, the tone control unit 17 for controlling the tone by receiving the mixed signal from the mixing unit 16 and the electrical signal of the tone control unit 17 It is sensed by the speaker 18 to convert into a sound, and the said signal detection part 15 The microcomputer 19 is configured to receive an input signal and control the echo processing unit 13, the tone control unit 17, and the A / V switch 14.

As illustrated in FIG. 3, the signal detector 15 includes a low pass filter 15a for passing only a low frequency portion of a music signal, and an amplifier for receiving and amplifying a signal filtered by the low pass filter 15a. 15b), a rectifying part 15c for rectifying the signal amplified by the amplifier 15b, and a smoothing part 15d for receiving and smoothing the signal rectified by the rectifying part 15c.

The rectifying unit 15c is composed of a diode D1 to rectify the amplified current, and the smoothing unit 15d includes a resistor R1 and a capacitor C1 for charging the current rectified by the diode D1, and the capacitor. It consists of the resistor R2 which discharges the electric current charged by C1.

Therefore, the charging time constant is determined by the resistor R1 and the capacitor C1, and the echo on time can be adjusted by adjusting the time constant, and the echo off time can be adjusted by the discharge time constant C1R2.

If the discharge time constant is sufficiently larger than the charging time constant, the echo value can be prevented from being zero even when there is no music sound for a certain period of time, thereby eliminating the case where the echo suddenly becomes 0 while singing.

Therefore, the human voice is converted into an electrical signal in the microphone 11, and the converted signal is so small that it is amplified by 50 to 100 times in the microphone amplifier 12 to the desired signal level.

The amplified signal is echo-processed by the echo processor 13, and the mixing unit 16 mixes the signal selected by the A / V switch 14 and the output signal of the echo processor 13.

The signal detecting unit 15 detects the presence or absence of a signal and transmits information to the microcomputer 19, and the microcomputer 19 controls the echo control unit 13 and the tone controller 17 based on the received information. By this, the amount of echo and timbre are controlled.

In this way, the echo and tone are kept at the preset values only when there is a signal, the echo amount is set to "0" when there is no signal, and the tone is set to automatic voice suitable for information transfer. Reproduce the sound through.

4 is a flow chart illustrating a method for controlling the echo and tone of the microphone according to the present invention, in which it is determined whether the mode selected by the user is the echo automatic mode (S11). It is determined (S12).

If the output of the signal detector is less than or equal to the reference voltage, the echo value is set to 0 (S13), and the tone is automatically switched to the news mode (S14).

If the output of the signal detection unit is equal to or higher than the reference voltage, the tone is automatically switched to the music mode without changing the echo value (S15).

After the process is performed, it is determined whether to turn off the eco-auto mode (S17), and if the off is desired, the process ends.

As described above, when the signal detection unit output is equal to or higher than the reference voltage, the music signal is output. Thus, the echo processing unit and the tone control unit are controlled to change the echo value and set the tone as the music mode.

On the contrary, when the signal detection unit output is less than the reference voltage, it is determined that an audio signal is output, and the echo value is set to "0" and the echo processing unit and the tone control unit are controlled to automatically switch the tone to the news mode.

The frequency versus amplification degree in the news mode and the music mode will be described with reference to FIG. 5.

5a is a graph showing the frequency vs. amplification degree in the 'news mode', which increases the amplification degree around 600 ~ 700Hz, which is the section with the highest human voice component, and shows the amplification degree of the remaining frequency band that does not contain the main components of the remaining voice. Print it down.

5b is a graph showing the frequency vs. amplification degree in the 'music mode' state, in order to make use of the characteristics of the music signal evenly distributed in all frequency bands by equalizing the amplification degree for all human frequencies.

The echo and tone control method of the microphone according to the present invention has the following effects.

First, by automatically switching the echo amount and tone according to the purpose of use, it is possible to improve the user's hassle to control the echo amount and tone.

Second, it is very effective when used in a short time when the music is not applied.

Claims (3)

A voice input unit for converting a human voice into an electrical signal and amplifying the input voice; An echo processing unit for receiving an amplified signal from the voice input unit and performing echo processing; A / V switch to switch music signal and various sources, A signal detector for receiving a music signal and various sources switched by the A / V switch and outputting a detection signal; A mixing unit which receives and mixes the switching signal of the A / V switch and the echo signal output from the echo processing unit, A tone control unit configured to receive a mixed signal from the mixing unit and perform tone control; A speaker for converting an electrical signal output from the tone controller to sound; Echo and tone control device, characterized in that composed of a microcomputer receives the detection signal from the signal detection unit, and outputs a control signal to the echo processing unit, tone control unit, A / V switch. The method of claim 1, The signal detection unit is a low pass filter for receiving and filtering the music signal; An amplifier for amplifying the music signal filtered by the low pass filter; A rectifier for rectifying the music signal amplified by the amplifier; Echo and tone control device, characterized in that consisting of a smoothing unit for receiving the music signal rectified by the rectifier. In the control method of the echo and tone control device provided with a microcomputer, signal detection unit, tone control unit, A first step of determining whether to be in an automatic echo mode; A second step of determining whether an output of the signal detection unit is equal to or greater than a reference voltage when the determined result value is an echo automatic mode; A third step of controlling an echo and a tone in a music mode when the signal detection unit outputs a reference voltage or more; A fourth step of controlling an echo and a tone in a news mode when the signal detection unit output is equal to or less than a reference voltage; And a fifth step of determining whether the echo auto mode is off after performing the third to fourth steps.