KR20000002810U - Automatic Sound Mode Selector of Stereo Sound Equipment - Google Patents

Abstract

The present invention relates to a sound mode automatic selection device of a stereo sound device that can maximize the stereo sound effect by determining whether the input audio signal is a stereo signal or a mono signal and automatically selects a stereo sound mode according to each signal. A stereo sound processor configured to process the input audio signal in stereo stereo mode and stereo mono mode; A signal discriminating unit which determines whether the input audio signal is a stereo signal or a mono signal; And a control unit for automatically selecting and controlling the signal processing of the stereo sound processor in stereo stereo mode or stereo mono mode based on the determination result of the signal discrimination unit, thereby maximizing stereo sound effects according to the input audio signal. It is a useful design to do.

Description

Automatic Sound Mode Selector of Stereo Sound Equipment

The present invention relates to a stereo sound device, and more specifically, to determine whether an input audio signal is a stereo signal or a mono signal, and to automatically stereoscopic stereo mode or stereo mono mode to maximize the stereoscopic sound effect according to each discrimination signal. The present invention relates to a sound mode automatic selection device of a stereo sound device which can be selected by using.

Conventionally, a stereo sound processor developed by SRS (Sound Retrieval System) is widely used as a stereo sound processor for converting a stereo sound field to a mono or stereo signal as an input audio signal.

The stereo sound processing apparatus employing such a stereo sound processor includes an operation unit 10 for setting a stereo sound stereo mode, a stereo sound mono mode, or a stereo sound off mode by the user; A controller 20 which determines whether the mode selection signal input from the operation unit 10 is a stereo stereo mode, a stereo mono mode, or a stereo off mode and outputs a different mode selection control signal according to each mode; And based on the mode selection control signal from the control unit 20, input audio signals A / Lin and A / Rin to stereoscopic stereo signal processing or stereoscopic mono signal processing or stereophonic sound. It is configured to include a stereo sound processor 30 for outputting the signal off.

The stereo sound processor 30 includes a subtractor 31 which subtracts an L input signal A / Lin and an R input signal A / Rin as shown in FIG. An adder 32 for adding the L input signal A / Lin and the R input signal A / Rin; A bypass processing unit 33 for bypassing the L input signal A / Lin and the R input signal A / Rin; The L input signal A / Lin, the R input signal A / Rin, and a subtraction signal of the subtractor 31 are input, and the subtracted signal is subjected to stereo stereo signal processing, and each of the signal processed subtraction signals is inputted to L. A stereo sound stereo processing unit 34 which is added to the signal A / Lin and the R input signal A / Rin and output as the L output signal A / Lout and the R output signal A / Rout; The L input signal A / Lin, the R input signal A / Rin, and the adder signal of the adder 32 are inputted, and the adder signal is processed in stereo mono signal, and the L-signaled adder signal is input to each L. A stereo sound mono processor 35 which adds to the signals A / Lin and the R input signals A / Rin and outputs the L output signals A / Lout and R output signals A / Rout; A signal for selecting and outputting any one of audio L signals output from the bypass processor 33, the stereo sound stereo processor 34, and the stereo sound mono processor 35 according to the control signal of the controller 20; The bypass processing unit 33, the stereo sound stereo processing unit 34, and the stereo sound mono processing unit 35 are interlocked with the first switching element SW1 and the first switching element SW1 in accordance with a control signal of the control unit 20. It includes a switching output unit 36 made of a second switching element (SW2) for selecting any one of the audio R signal output from the ().

In the stereoscopic sound processing apparatus configured as described above, the user directly selects the stereoscopic sound output mode, and the stereoscopic sound effects for each user's selection mode according to the input audio signal are shown in Table 1 below.

Stereo off Stereo mono Stereo stereo Mono - Big effect Same as stereo off mode Hi-fi - Less effective Big effect

As can be seen from Table 1, when a stereo audio mode is input when the user selects the stereo sound mode when the broadcast signal is input through the tuner, when the external audio is input, or when the audio is recorded on the recording medium, the stereo sound is turned off. Similarly, an audio signal without any stereoscopic sound output is output.

Therefore, in the conventional stereo sound processing apparatus, the user may feel the stereo sound effect only when the user changes the stereo sound mode to stereo off mode, stereo mono mode or stereo stereo mode according to the input audio signal. .

That is, when a stereo audio mode is input when a hi-fi (stereo) audio signal is input, the stereoscopic sound effect is greatest when the stereo audio effect is selected. According to the input audio signal, it was inconvenient to select the stereo sound mode in order to feel an excellent stereo sound effect. In addition, when a user selects a stereo sound stereo mode in a state in which a mono audio signal is input, there is a problem in that the stereo sound effect cannot be felt at all.

On the other hand, there is a known technique such as determining whether a broadcast signal input from a conventional tuner is a stereo broadcast signal or a mono broadcast signal and displaying the signal state by an On Screen Display (OSD) method. There is no known technique for determining whether a reproduced signal or an input signal from an external device is a stereo signal or a mono signal, and furthermore, there is no known technique for automatically selecting a mode of a stereo sound processor using these determination results. . Accordingly, it is desirable to develop a device that automatically selects a stereo sound mode in order to maximize the stereo sound effect of the stereo sound processor according to the input audio signal.

Therefore, the present invention was created to solve the above problems, and can determine whether the input audio signal is a stereo signal or a mono signal and can maximize the stereo sound effect by automatically selecting the stereo sound mode according to each signal. It is an object of the present invention to provide a sound mode automatic selection device of a stereo sound device.

1 is a block diagram schematically showing an apparatus for automatically selecting a sound mode of a stereo sound device according to the present invention;

FIG. 2 is a detailed block diagram of the stereo sound processor illustrated in FIG. 1;

FIG. 3 is a block diagram showing an application example of an automatic mode selection apparatus for a stereo sound apparatus shown in FIG. 2;

FIG. 4 is a diagram illustrating an embodiment of a control flow for an automatic mode selection apparatus of a stereo sound apparatus shown in FIG. 3;

5 is a block diagram schematically showing a conventional stereoscopic sound processing apparatus,

FIG. 6 is a detailed block diagram of the stereo sound processor illustrated in FIG. 5.

※ Explanation of code for main part of drawing

10: control panel 20: control unit

30: stereo sound processor 31: subtractor

32: adder 33: bypass processing unit

34: stereo sound processing unit 35: stereo sound mono processing unit

36: switching output unit 200: control unit

400: signal discriminating unit

A sound mode automatic selection apparatus for a stereo sound device according to the present invention for achieving the above object, in the stereo sound device; Stereo sound processing means for processing the input audio signal in stereo stereo mode and stereo mono mode; Signal discriminating means for discriminating whether the input audio signal is a stereo signal or a mono signal; And control means for setting a signal processing mode of the stereo sound processor on the basis of the determination result of the signal discriminating unit.

In the automatic sound mode selection device of the stereo sound device according to the present invention configured as described above, by determining whether the input audio signal is a stereo signal or a mono signal can automatically select a stereo sound mode that can maximize the stereo sound effect. .

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a sound mode automatic selection device of a stereo sound device according to the present invention will be described in detail.

1 is a view schematically showing a three-dimensional sound processing apparatus according to the present invention, Figure 2 is a detailed block diagram of the three-dimensional sound processor shown in FIG. In the drawings, components that perform the same functions as those of FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof will be omitted below.

Reference numeral 400 denotes a signal discrimination unit for determining whether an input audio signal is a stereo signal or a mono signal, and compares the carrier signal of the L signal and the R signal to determine a mono signal if it is the same and a stereo signal if it is different.

The controller 200 automatically selects the output of the stereo sound processor 30 based on the determination signal of the signal discriminator 400 so as to maximize the stereo sound effect of the input audio signal.

FIG. 3 is a view showing an application example in which the stereo sound processing apparatus shown in FIG. 2 is applied to a recording / playback apparatus capable of recording and reproducing an audio signal or an audio signal and a video signal on a recording medium.

Here, the recording medium is a magnetic tape or an optical disk capable of recording and reproducing, and the input audio signal of the recording and reproducing apparatus is a broadcast input signal received through a tuner, a playback input signal reproduced from the recording medium, and a line input terminal from an external device. It is an external input signal. Each input audio signal is input through an L signal line and an R signal line, and when a user selects any one of a broadcast signal mode, a playback mode, and an external input mode through the control unit 10, the control signal of the controller 200 is input. The switching elements SW3, SW4, and SW5 selected according to the switching are input to the input terminals A / Lin and A / Rin of the stereo sound processor 30. In the drawing, only the L signal line and the R signal line are overlapped for the sake of simplicity, and only one switching element SW3, SW4, SW5 is shown.

Next, the operation of the automatic sound mode selection device of the stereo sound device configured as described above will be described with reference to the control flow of FIG. 4.

First, the control unit 200 determines whether there is a broadcast signal mode request through the operation unit 10 (step S11), and if there is a broadcast signal mode request, the controller 200 controls switching of the switching element SW3 so that the broadcast signal from the tuner is stereoscopic. After controlling to be input to the processor 30 (step S13), the signal discrimination unit 400 compares the L signal input and the R signal input of the 3D sound processor 30 and transmits the comparison result signal to the controller 200. It outputs (step S14).

Thereafter, the control unit 200 determines whether the L input signal and the R input signal are the same based on the comparison result signal, and if the input signal is the same, determines that the input broadcast signal is the mono signal (SW1) of the switching output unit 36. SW2 controls to select the L output signal and the R output signal of the stereo sound mono processing unit 35, respectively. On the other hand, when the L input signal and the R input signal are different, the control unit 200 determines that the input broadcast signal is a stereo signal, and the stereo sound stereo processing unit 34 at the switching elements SW1 and SW2 of the switching output unit 36, respectively. Control to select the L output signal and the R output signal (steps S17 to S21).

On the other hand, if there is no broadcast signal mode request in step S11, the controller 200 determines whether there is a play mode request (step S23), and if there is a play mode request, switching control SW4 is reproduced from the recording medium. The reproduction signal is controlled to be input to the stereo sound processor 30 (step S25). Thereafter, the automatic selection routine of the stereo sound mode is performed in the same manner as in the above-described steps S15 to S21 (step S27).

In addition, if there is no playback mode request in step S23, the controller 200 determines whether there is an external input mode request (step S29), and if there is no request, the control returns to step S11 described above, while switching if there is an external input mode request. Switching control of the element SW5 to control the external input signal input from the external input terminal to the stereophonic sound processor 30 (step S31), and then automatically select the stereoscopic sound mode in the same manner as in the above steps S15 to S21. The routine is performed (step S33).

By the control operation described above, the stereoscopic sound effect can be maximized according to whether the input audio signal is a stereo signal or a mono signal.

According to the automatic sound mode selection device of the stereo sound device according to the present invention, the stereo sound mode can be automatically selected to maximize the stereo sound effect according to whether the input audio signal is a stereo signal or a mono signal. Not only can eliminate the hassle of selecting the stereo sound mode according to the input signal, it is a useful design that can always feel the excellent stereo sound effect regardless of the preset stereo sound mode.

Claims (3)

In stereo sound equipment; Stereo sound processing means for processing the input audio signal in stereo stereo mode and stereo mono mode; Signal discriminating means for discriminating whether the input audio signal is a stereo signal or a mono signal; And And a control means for setting a signal processing mode of the stereo sound processor on the basis of the determination result of the signal discriminating unit. The method of claim 1, And the signal discriminating means compares the left and right signals of the input audio signal and discriminates them as mono signals if they are identical, and discriminates them as stereo signals if different. The method of claim 1, The control means sets the signal processing mode of the stereo sound processing means to a stereo sound stereo mode when the determination result of the signal discriminating means is a stereo signal, and sets the stereo sound mono mode when the determination result is a mono signal. Sound mode automatic selector.