KR0132876B1 - Method and circuit of low audio signal emphasizing and surround signal simultaneous treating - Google Patents

Abstract

A simultaneous processing method of bass boost signal and surround signal comprising : the bass boosting processing step respectively boosting the bass of prescribed frequency band in left and right audio signals having opposite phases; the surround signal processing step enhancing the separate ratio between said left and right audio signals which their basses are boosted in said bass boosting processing step; and the selecting step selecting said bass boosting processing step or said surround signal processing step, and a simultaneous processing circuit thereof having : the bass boosting processing means respectively boosting the bass of prescribed frequency band in left and right audio signals having opposite phases; the surround signal processing means enhancing the separate ratio between said left and right audio signals which their basses are boosted in said bass boosting processing means; and the selecting means selecting said bass boosting processing means or said surround signal processing means; are disclosed. Thereby, it is possible to simultaneously process the bass boost signal and the surround signal.

Description

Low tone emphasis and surround signal processing method and circuit

1 is a conventional low tone and surround signal processing circuit diagram.

Figure 2 is a block diagram showing a low tone emphasis and surround signal simultaneous processing circuit according to the present invention.

Figure 3 is a detailed circuit diagram showing a low tone emphasis and surround signal simultaneous processing circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

10: low tone emphasis processing means 16: L channel low tone emphasis portion

17: R channel bass emphasis unit 20: surround signal processing means

26: L channel amplifier 27: R channel amplifier

30: Selection part LS, RS: Left, right speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit and method for simultaneously processing low tone and surround signals in a portable audio device, and in particular, a low tone and surround signal simultaneous processing circuit and method capable of simultaneously processing low tone and surround signal functions according to a user's selection. It is about.

In general, the frequency band of the audio signal, that is, the audible frequency band is 20Hz ~ 20KHz. The audio component of the audio signal is distributed around 1 KHz, and the audio component of the audio signal is evenly distributed over the full audio frequency band. In particular, the acoustic components of low musical instruments such as drums, cello, bass guitar, etc. are distributed in the low frequency range and are output through the low-end speakers. The signal for activating the shadow of the audio signal, that is, the sense of presence (reality), is called a surround signal.

Therefore, conventionally, as shown in FIG. 1, low tone emphasis processing and surround signal processing are separately performed.

According to FIG. 1, in the (L + R) signal generator 11 of the low tone emphasis processing means 10, the left and right channel audio signals L and R, which are reproduced and output from the left and right heads, are left and right. The sum signal (L + R) of the channel audio signal is output. In the low pass filter (LPF) 12, only the audio signal within 250 Hz of the output signal of the (L + R) signal generator 11 is filtered and amplified by the first audio amplifier 13, and then the low sound dedicated speaker 14 )

On the other hand, in the (LR) signal generator 21 of the surround signal processing means 20, the left and right channel audio signals L and R, which are reproduced and output from the left and right heads, are different from the left and right channel audio signals. Output to (LR). The delay unit 22 delays the output signal of the (LR) signal generator 21 by a predetermined time and amplifies it in the second audio amplifier 23, and then outputs the left and right audio signals to the left and right speakers LS, RS)

However, in the related art, since the low tone emphasis and surround signal functions are separately processed as described above, processing circuits are expensive, and low-level products such as portable audio devices have difficulty in employing them.

In addition, there is a problem that the processing effect is reduced when employed in low-end products such as portable audio equipment.

Accordingly, an object of the present invention is to provide a low tone tone and surround signal simultaneous processing method capable of simultaneously processing the low tone tone and surround signal functions according to a user's selection in a portable audio device.

Another object of the present invention is to provide a circuit most suitable for realizing the low tone emphasis and surround signal simultaneous processing method.

In order to achieve the above object, the method of simultaneously processing low tone and surround signals according to the present invention is a low tone emphasis processing for emphasizing the bass in a predetermined frequency band of a left and right channel audio signal having opposite phases in a portable audio device. Selecting whether to perform a surround signal processing, the low tone processing, and the surround signal processing to improve the separation of the left and right channel audio signals that are outputted in the low tone emphasis processing; It includes a selection process for.

In order to achieve the above object, the low tone emphasis and surround signal simultaneous processing circuit according to the present invention is a portable audio device having left and right speakers, and has a low frequency of a predetermined frequency band of a left and right channel audio signal having a phase opposite to each other. Low tone emphasis processing means for emphasizing the sound quality, surround signal processing means for improving the separation of the left and right channel audio signals with the low tone emphasized in the low tone emphasis processing, and the bass emphasis processing means and the surround signal processing means And selection means for selecting whether or not to operate the controller.

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

2 is a block diagram showing a low tone emphasis and surround signal simultaneous processing circuit according to the present invention.

The configuration of the block diagram shown in FIG. 2 is largely composed of the low tone emphasis processing means 10, the surround signal processing means 20, and the selection unit 30. As shown in FIG.

In addition, the low tone emphasis processing means 10 is the L-channel low tone emphasis portion 16 for emphasizing the low tone of the L-channel audio signal according to the selection signal output from the selection portion 30, and the selection output from the selection portion 30. The R channel low tone emphasis unit 17 is used to emphasize the bass of the R channel audio signal.

In addition, the surround signal processing means 20 amplifies the output signal of the L-channel low tone emphasis unit 16 according to the selection signal output from the selection unit 30 and converts the amplified signal to the left speaker LS and the R channel described below. L-channel amplification section 26 for outputting to the amplification section 27 and the output signal of the R-channel low tone emphasis section 17 according to the selection signal output from the selection section 30 to amplify the amplified signal R-channel amplifier 27 for outputting to the speaker (RS) and the L-channel amplifier 26.

3 is a detailed circuit diagram showing a low tone emphasis and surround signal simultaneous processing circuit according to the present invention.

In the configuration of the circuit diagram shown in FIG. 3, first, the selector 30 is composed of a switch.

The L-channel low tone emphasis unit 16 includes a resistor R1 to which an L-channel audio signal is applied to one input terminal, and the other input of the resistor R1 to which one input terminal is connected to the other input terminal of the resistor R1. The resistor R2 connected to the connection point between the terminal and the one input terminal of the resistor R3 and the collector terminal are connected to the ground terminal through the capacitor C1, the emitter terminal is connected to the ground terminal, and the base terminal is connected to the ground terminal. The transistor Q1 is configured to receive a selection signal from the selector 30 through a resistor R20.

The R channel low tone emphasis unit 17, like the L channel low tone emphasis unit 16, has a resistor R11 to which an R channel audio signal is applied to one input terminal, and one input terminal is connected to the other input terminal of the resistor R11. The resistor R12 to be connected, the resistor R12 connected at one side of the input terminal between the other input terminal of the resistor R11 and the one input terminal of the resistor R13, and the collector terminal are connected to the capacitor C11. A transistor Q11 to which a emitter terminal is connected to a ground terminal, a base terminal terminal to which a selection signal of the selector 30 is applied through a resistor R20, and a cathode terminal of the transistor Q11. The negative terminal is composed of a capacitor C12 connected to the base terminal.

The L-channel amplifier 26 has a capacitor C2 in which the negative terminal is connected to the other input terminal of the resistor R3, and the one input terminal is the other input terminal of the resistor R3 and the negative terminal of the capacitor C2. The resistor R4 connected to the connection point between the collector terminal and the collector terminal are connected to the ground terminal through the resistor R5, the emitter terminal is connected to the ground terminal, and the base terminal is selected through the resistor R20. Transistor Q2 to which a selection signal is applied, one input terminal is connected to the collector terminal of the transistor Q2, and the other input terminal is connected to the resistor R6 connected to the output terminal of the R-channel amplifier 27. The base terminal is connected to the positive terminal of the capacitor C2, the emitter terminal is connected to the ground terminal through the resistor R9, and the collector terminal is supplied with the reference power source B + through the resistor R8 ( Q3), the resistor R7 connected between the collector terminal of the transistor Q3 and the base terminal, and the anode terminal The negative terminal is composed of a capacitor C3 connected to the collector terminal of the transistor Q3 and connected to the left speaker LS.

The R-channel amplifier 27 has a capacitor C13 in which the negative terminal is connected to the other input terminal of the resistor R13, and one input terminal is the other input terminal of the resistor R13 and the negative terminal of the capacitor C13. The resistor R14 connected to the connection point between the collector terminal and the collector terminal are connected to the ground terminal through the resistor R15, the emitter terminal is connected to the ground terminal, and the base terminal is selected through the resistor R20. Transistor Q12 to which a selection signal of () is applied, and one input terminal is connected to the collector terminal of transistor Q12, and the other input terminal is connected to resistor R16 connected to the output terminal of L-channel amplifier 26. The base terminal is connected to the positive terminal of the capacitor C13, the emitter terminal is connected to the ground terminal through the resistor R19, and the collector terminal is supplied with the reference power source B + through the resistor R18 ( Q13), the resistor R17 connected between the collector terminal and the base terminal of the transistor Q13, and Terminal is connected to the collector terminal of the transistor (Q13), the negative terminal is composed of a capacitor (C14) connected to the right speaker (RS).

The operation of the present invention will now be described with reference to FIG.

When the user does not want to operate the low tone emphasis processing circuit 10 and the surround signal processing circuit 20, the selector 30 is turned off so that the reference power source B + is provided through the resistor R20, respectively. It is applied to the base terminals of Q1, transistor Q2, transistor Q11, and transistor Q12, and transistor Q1, transistor Q2, transistor Q11, and transistor Q12 are turned on. Thus, the collector terminals of transistors Q1, Q2, Q11 and Q12 become zero volt potential, so that the left channel audio signal is only leveled by resistors R1, R2, R3, R4. Only the level is reduced, and the right channel audio signal is similarly reduced in level by the resistors R11, R12, R13, and R14, and applied to the L-channel amplifier 26 and the R-channel amplifier 27, respectively.

In the L-channel amplifier 26 and the R-channel amplifier 27, the transistors Q3 and Q13 respectively output left and right channel audio signals whose level is reduced from the original signal applied from the low tone emphasis processing means 10, respectively. Inverted and outputted to the left and right speakers LS and RS, respectively.

However, when the user wants to operate the low tone emphasis processing circuit 10 and the surround signal processing circuit 20, the selector 30 is turned on and is connected to the base terminals of the transistors Q1 and Q2. Since no signal is applied, the transistors Q1 and Q2 are turned off. Therefore, the collector terminals of the transistors Q1 and Q2 are open, and the left channel audio signal is emphasized by the resistors R1 and R2 and the capacitor C1, and the right channel audio signal is similarly resistanced. The bass is emphasized by the R11 and R12 and the condenser C11, and applied to the L channel amplifier 26 and the R channel amplifier 27, respectively. At this time, the left channel audio signal can adjust the frequency and adjust the boost level according to the values of the resistors R1 and R2 and the capacitor C1, and the right channel audio signal can include the resistors R11 and R12 and the capacitor ( The value of C11) can adjust the frequency and adjust the boost level.

In the surround signal processing circuit 20, since the selector 30 is on, no signal is applied to the base terminals of the transistors Q11 and Q12, and thus the transistors Q11 and Q12 are turned off. Accordingly, the collector terminals of the transistors Q11 and Q12 are open, and the left channel audio signal in which the low tone is emphasized in the L channel low tone emphasis unit 16 is inverted and amplified by the transistor Q3 and left speaker LS At the same time, the signal is applied to the input terminal of the R-channel amplifier 27 through the resistor R16. In addition, the right channel audio signal in which the bass sound is emphasized in the R channel low tone emphasis unit 17 is inverted and amplified by the transistor Q13 and output to the right speaker RS, and at the same time, the L channel amplifier 26 It is applied to the input terminal.

That is, when the left and right channel audio signals are out of phase with each other, the signal applied to the input terminal of the R channel amplifier 27 from the output terminal of the L channel amplifier 26 and the L channel low tone emphasis 16 Since the phase of the left channel audio signal in which bass is emphasized is the same, the input is overlapped with each other, and the signal applied to the input terminal of the L channel amplifying unit 26 and the R channel bass are similarly applied. Since the phase of the right channel audio signal in which the bass tone is emphasized in the emphasis unit 17 is the same, the input is increased so that the output signal is increased. Therefore, it can be seen that the separation of the left and right channels is improved.

In addition, the selector 30 may be configured using a microcomputer or a differential amplifier instead of a switch.

As described above, the method and circuit for processing low tone and surround signals simultaneously according to the present invention can simultaneously process low tone and surround signal functions according to a user's selection in a portable audio device, as well as simplify the circuit. .

Claims (2)

A bass enhancement surround simultaneous processing circuit for simultaneously processing bass enhancement and surround processing of left and right channel audio signals and outputting them to left and right speakers, the left channel bass emphasis unit for introducing the left channel audio signal and emphasizing the bass band, and outputting the same; A right channel bass boost unit for introducing a right channel audio signal and emphasizing a bass band, and outputting the left channel bass emphasis unit and an inverted right channel audio signal, and inverting and amplifying the left channel surround signal for output to the right speaker. And a right channel surround signal processor for adding the output of the signal processor and the right channel bass emphasis unit and the inverted left channel audio signal, inverting and amplifying the left channel audio signal to the right speaker. The display apparatus of claim 1, wherein the left channel surround signal processor further comprises a transistor Q2 bypassing the inverted right channel signal in response to a control signal so that the left channel surround signal processor does not add up to the output of the left channel bass emphasis unit. The right channel surround signal processor further includes a transistor Q12 that bypasses the inverted left channel signal in response to a control signal so that the right channel surround signal is not summed with the output of the right channel low tone emphasis unit. And a selection unit for outputting a control signal for controlling the bypass operation.