KR100252588B1 - Pseudo-surround sound output method - Google Patents

Abstract

PURPOSE: A method for outputting virtual surround sounds is provided which makes a sound signal output through a speaker have the same sound effect as that of a signal output through multiple speakers. CONSTITUTION: Mono sound is generated at an arbitrary reference phase point. A predetermined phase difference is given to the phase of the mono sound to generate stereo sound. A predetermined phase difference is given to the phase at which the stereo sound is generated to generate left and right surround sounds. The mono sound is commonly output through speakers, the left surround sound and the right surround sound are separately output through different speakers simultaneously.

Description

Virtual surround sound output method.

The present invention relates to an audio system, and more particularly, to a virtual surround sound output method capable of allowing a sound signal output through a plurality of speakers to have the same sound effect as output using a plurality of speakers.

An audio system records or reproduces sound of an audible frequency in a predetermined medium. The audio system includes a television, a radio, a tape cassette recorder, a CD player, and the like.

Among the above-mentioned audio systems, a television or a radio receives sound when a broadcast station transmits the sound through air through a predetermined modulation process, demodulates the sound into an audible sound that a user can hear, and transmits the demodulated sound through a predetermined sound output means (hereinafter referred to as a speaker). To print.

There are two methods of outputting sound through the television or radio, a mono method, a stereo method, and a surround method.

The mono system broadcasts a sound signal using one frequency band, and broadcasts sound acquired by a sound acquiring means disposed at a predetermined place irrespective of a sound source, and thus is output through the audio system. The acoustic signal is somewhat different from the original acoustic signal.

The stereo system broadcasts sound signals using a plurality of frequency bands. The stereo signal is divided into a left stereo signal and a right stereo signal according to a sound source, and the left and right stereo signals are respectively divided into the plurality of frequency bands. Since the sound signal is closer to the original sound than the mono method, the sound signal is output through the audio system. The surround method is an example of the stereo method. The reverberation signal reflected by an arbitrary object is output together.

Due to the increase in leisure time due to the technological advancement and economical abundance of the audio system, the audio system has recently been transformed into an era of simply listening to the sound output from the audio system and feeling the sound output from the audio system. Users enjoyed near-original sound in listening to music and watching movies, as well as inexpensive products with superior sound output performance.

1 is a block diagram illustrating the above-described surround audio system.

The audio system includes a sound processor 10 for removing noise from an airwave signal input from an antenna ANT and outputting an audio signal, and a signal output from the sound processor 10 and peripheral devices 20 of the audio system. Switch unit 30 for selecting a predetermined signal from the signal output from the) and the sound signal separation unit 40 for performing a predetermined process so that a plurality of sound signals output from the switch unit 30 is divided into And a speaker (50a, 50b, 50c, 50d, 50e) for outputting the signal output from the sound signal separation unit 40.

In more detail, the signal output from the sound signal separation unit 40 is a plurality of speakers (50a, 50b, 50c, 50d, 50e) arranged in a plurality of predetermined places in the room to deliver a sound corresponding to the original sound to the user Distributed output through

In more detail, the plurality of speakers 50a, 50b, 50c, 50d, and 50e are described in detail. The center speaker 50a outputs a mono signal L + R and the left stereo signal L is output. Left speaker 50b, Right speaker 50c that outputs the right stereo signal R, and Left rear sound (that is, a sound heard from the rear of the user, that is, a reverberation signal; Lsur). It is divided into a left rear speaker 50d and a right rear speaker 50e which outputs a right rear Rsur.

In FIG. 2, a speaker arrangement for allowing a user to feel maximum satisfaction with sound listening in the audio system configured as described above is illustrated.

In the arrangement of the speaker, it is important to arrange the left and right speakers symmetrically.

The center speaker 50a is disposed at a position spaced apart from the user 60 by a predetermined distance from the front of the user 60 to output sound in all directions, and the light speaker 50c is used to connect the center speaker 50a to the center speaker 50a. It is disposed so as to face the user 60 at a position having a predetermined angle (45 °) to the right of the user 60 as a center, and outputs an acoustic signal only in front of the user, and the left speaker 50b controls the center speaker 50a. It is disposed to face the user 60 at a position having a predetermined angle (45 °) to the left of the user 60 as a center and outputs sound forward.

The left rear speaker 50d is positioned at a position having a predetermined angle (45 °) to the left of the user 60 at the rear of the user 60 to output a left rear sound, and the light rear speaker 50e is The rear side of the user 60 is disposed at a position having a predetermined angle (45 °) to the right with respect to the user 60 to output a right rear sound.

Therefore, the signals output from the plurality of speakers 50a, 50b, 50c, 50d, 50e are placed at the center of the user, and the arrangement positions of the speakers 50a, 50b, 50c, 50d, 50e. Due to the difference between the mono signal (L + R), the left and right signals (L, R), and the left and right back signals (Lsur, Rsur) have a phase difference, respectively.

However, in the conventional audio system as described above, in order for the user to listen to the surround sound corresponding to the original sound, as described above, a plurality of speakers must be accurately positioned at a predetermined position in a room having a specific angle with respect to the user. In the arrangement of the speaker, there is a problem in that it is not easy to add accuracy to the arrangement position of the speaker.

In addition, since the plurality of rear speakers are disposed at a substantially spaced position from the main body of the audio system, the length of the wire connecting the speaker and the main body becomes long, so that the processing of the wires is not easy, and as described above, There was a problem that the attenuation of the signal occurs as the length is passed through the wire.

The present invention for solving the above problems is to provide a virtual surround sound output method that can make the sound signal output through the plurality of speakers have the same sound effect as the output using the plurality of speakers. There is a purpose.

1 is a block diagram showing a conventional surround audio system.

2 is a view showing an optimum arrangement position of a plurality of conventional speakers.

3 is a block diagram illustrating an audio system according to the present invention.

Explanation of symbols on the main parts of the drawings

10: sound processor 20: peripheral device

30: switch unit 40: sound signal separation unit

50b: left speaker 50c: right speaker

70: phase delay unit

A feature of the present invention for achieving the above object is an acoustic signal separation unit for separating and outputting a sound signal into a plurality of signals and the audio output of the audio system including a left and right speaker disposed in a predetermined position in front of the user to output sound A method comprising: a first process of generating a mono sound at an arbitrary reference phase point, a second process of generating a left and right stereo sound by giving a predetermined phase difference with respect to the phase of the mono sound generated in the first process, and In the third process of generating a left and right rear sound by giving a predetermined phase difference with respect to the phase in which the stereo sound is generated in the second process, and the sounds generated by the first to third processes, the mono sound is transmitted through the left and right speakers. If it occurs in common and the left and right sounds are separated into different speakers, Is to ensure that each of the sound output by mistake to a fourth process, the simultaneous sound.

According to an additional aspect of the present invention, in the second process, the left stereo signal has a phase difference of + 45 ° with respect to the mono signal, and the right stereo signal has a phase difference of -45 ° with respect to the mono signal. In step 3, the left trailing signal has a phase difference of + 90 ° with respect to the left stereo signal, and the right trailing signal has a phase difference of -90 ° with respect to the right stereo signal.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a block diagram of an audio system according to the present invention.

The audio system includes a sound processor 10 for removing noise from an airwave signal input from an antenna ANT and outputting an audio signal, and a signal output from the sound processor 10 and peripheral devices 20 of the audio system. The switch unit 30 for selecting a predetermined signal among the signals output from the signal, and the mono signal (L + R) and the right stereo signal (R) having a predetermined intensity, respectively, the sound signal output from the switch unit 30 ) And a sound signal separation unit 40 for performing a predetermined process to be divided into a left stereo signal L, a left rear signal Lsur and a right rear signal Rsur, and the sound signal separation unit 40. A phase delay unit 70 for delaying and outputting a phase of a signal output from the left side, a left stereo signal L, a mono signal L + R, and a left rear signal with a delayed phase output from the phase delay unit 70; (Lsur) A left speaker 50b to be output, a right stereo signal R having a delayed phase output from the phase delay unit 70, a right speaker 50c to output a mono signal L + R, and a right rear sound signal Rsur ).

In detail, the phase delay unit 70 has a phase difference in which the right stereo signal R has a phase difference of −45 ° with the mono signal L + R output from the sound signal separation unit 40 as a reference signal. The delay means D1, the phase delay means D2 for causing the left stereo signal R to have a phase difference of + 45 ° by using the mono signal L + R as a reference signal, and the left trailing signal Lsur. A phase delay means D3 to have a phase difference of + 90 ° with respect to the left stereo signal L, and a right rear sound signal Rsur to have a phase difference of -90 ° with respect to the right stereo signal R Phase delay means (D4).

The right phase stereo signal R, the mono signal L + R, and the right rear sound signal among a plurality of signals R, L, L + R, Rsur, and Lsur having a predetermined phase difference by the phase delay unit 70. Rsur is output through the right speaker 50c and the left stereo signal L and the mono signal L + R and the left rear signal Lsur are output through the left speaker 50b, respectively. In the case of the signals output to the speakers 50b and 50c, for example, the signals output to the right speaker 50c, the right stereo signal R, the mono signal L + R and the right rear sound signal Rsur Each has a phase difference of a predetermined value.

Therefore, the signals output through the plurality of speakers are to be listened to by the user with the same phase difference as when the plurality of speakers are arranged at a predetermined point, so that the signals output through the plurality of speakers have a surround sound effect. Will be represented.

The present invention operated as described above is to produce a sound effect of the surround method using a plurality of speakers using a plurality of speakers, there is an effect that the economic efficiency is improved as the number of speakers is reduced, the above-described specific location in the room Since the speaker is not disposed, the convenience of use is greatly improved, and the length of the copper wire between the main body and the speaker is shortened, thereby facilitating the processing of the wire connecting the main body and the speaker.

Claims (3)

In the sound output method of the audio system comprising a sound signal separation unit for separating and outputting the sound signal into a plurality of signals, and left and right speakers disposed in a predetermined position in front of the user to output sound, A first process of generating a mono sound at any reference phase point; A second step of generating a left and right stereo sound by giving a predetermined phase difference with respect to the phase of the mono sound generated in the first step; A third step of generating a left and right rear sound by giving a predetermined phase difference with respect to a phase in which stereo sound is generated in the second step; And In the sounds generated by the first to third processes, the mono sound is generated in common through the left and right speakers, and the left sound and the right sound are respectively separated by different speakers, respectively. Virtual surround sound output method characterized in that the output sound is mistaken for the simultaneous sound. The virtual surround sound output method of claim 1, wherein in the second process, the left stereo signal has a phase difference of + 45 ° with respect to the mono signal, and the right stereo signal has a phase difference of -45 ° with respect to the mono signal. . The virtual surround sound of claim 1, wherein, in the third process, the left rear signal has a phase difference of + 90 ° with respect to the left stereo signal, and the right rear signal has a phase difference of −90 ° with respect to the right stereo signal. Output method.

Images