KR100852642B1 - The 3D Surround System by Signal Delay Time/Level Attenuation and The Realizable Method thereof - Google Patents

Abstract

The present invention relates to a 3D surround stereophonic sound system and a method for implementing the same, which acts as a major factor in engineering the sound attenuation of the reflection and the arrival path of the sound transmitted from the original sound and recognizing the actual situation among the arrival paths of the sound source. By calculating the phase change and attenuation of the arrival sound to be applied when restoring the sound, it is possible to realize the simplification by the path of the minimum sound arrival and to apply the effects of the 3D surround amplifier without using a separate sound effect chip. The present invention relates to a surround stereophonic sound system and a method for implementing the same, which can provide sound delay and level attenuation, which can be realized in a wireless communication system including Bluetooth. Is there.

Sound delay, level attenuation, Bluetooth chipset, signal buffering, stereophonic sound, wireless transmit and receive.

Description

Surround 3D sound system with sound delay and level attenuation and its implementation {The 3D Surround System by Signal Delay Time / Level Attenuation and The Realizable Method

1 is a block diagram conceptually showing a structure of a surround amplifier equipped with a conventional two-way speaker;

2 is a block diagram conceptually showing a structure of a conventional 3.1 channel surround amplifier;

3 is a block diagram showing the internal circuit configuration of a conventional 3D surround chip.

4 is a conceptual diagram schematically illustrating a structure of a surround stereophonic sound system through sound delay and level attenuation;

5 is a block diagram schematically illustrating the structure of a surround stereophonic system with sound delay and level attenuation;

Figure 6a is a block diagram showing an embodiment of the application of a three-dimensional sound system to implement the sound delay according to the wired and wireless characteristics by implementing one side as a wireless system.

Figure 6b is a block diagram showing an embodiment of the application of a three-dimensional sound system by matching the sound delay and attenuation according to the wired and wireless characteristics by generating a sound delay on the wired side of Figure 6a.

 7 is a schematic diagram showing the structure of a buffer method for implementing the sound delay time according to the present invention.

8 is a flow diagram of surround stereophonic system software with sound delay and level attenuation according to the present invention.

※ Explanation of code about main part of drawing ※

100. Master Device

200. Slave Device

10. Bluetooth Chip Set

11, 11 '. Sub RF Chip Set

12, 12 '. Power Management

13, 13 '. Audio Amplifier

14, 14 '. Battery Charger & Supervisor

15, 15 '. Speaker Unit

The present invention relates to a system for implementing three-dimensional stereophonic sound, and more particularly, to a system for providing next-generation stereophonic sound and a technology for implementing the same, without including an expensive 3D surround chip.

In general, the implementation of 3D surround can be reproduced by mathematical calculations of the path of arrival, the time and the change of sound until the sound is released into the space and perceived by the human auditory, which is the space where the actual original sound occurs. It is a product of human cognition and the result of the change of the path of negative arrival in the situation that we listened to in the situation that human beings make the same path of arrival to sound as in the real environment. It can be.

As described above, there may be various paths of sound reaching the listener from the sound source, but the reflected sound perceived by the listener has a slight effect on giving the listener a sense of reality due to the loss of space, and gives the listener a realistic effect. The actual sound that causes the is due to the time difference of the sound reaching the listener's left and right ears without any reflection.

Conventionally, chips or software are provided to provide a variety of sound effects in order to make such a sense of realism, but this requires not only high cost but also the output limit and uniformity of the speaker even when the chip or software is applied in a portable audio device. Depending on the type of arrangement, there is a problem that it is difficult to obtain the desired result.

The present invention was devised to solve the above problems, but there is a deviation, but the distance of both ears of a general person is 250 mm and the time difference of the sound arriving at the two ears is calculated as 706 uS and shown in Table 1 below.

The graph shows the phase change when the sound source is located on the left side. The human body can see that phase reversal occurs at a frequency corresponding to an integer multiple of a specific frequency due to the structure of the hearing. Since the bass band is not so large, it can be seen that the bass band does not have a great effect on the realistic effect of perceiving the actual situation.

According to the present invention, the phase change and the attenuation of the sound, which is a major factor in engineering the analysis of the sound attenuation of the sound reflection and the arrival path and recognizing the actual situation among the arrival path of the sound source, are described. Its purpose is to provide a method and system that can be used to calculate and reconstruct the sound, thereby simplifying the path of minimal sound arrival and providing the effect of a 3D surround amplifier without the use of a separate sound effect chip. It is.

In addition, such a chip or software is relatively expensive, but if a human can clearly distinguish the difference in sound by hearing, such a chip or expensive software is not necessarily required because The aim is to provide a system that can be implemented by technical means that considers the law of arrival.

In addition, by realizing this in a wireless communication system including Bluetooth, the purpose is to enable to easily implement the 3D stereophonic sound system without mounting complicated software or hardware even in conventional portable audio equipment.

A preferred embodiment and its structure will be described in detail below with reference to the accompanying drawings, which include a surround stereoscopic sound system through sound delay and level attenuation according to the present invention for achieving the above object.

1 to 3 are related to the existing 3D surround system, as shown in the drawing, the conventional system is provided with a separate 3D surround chip to implement a three-dimensional stereo sound, which is a software input signal from the sound source The 3D surround chip is relatively expensive, and its structure is highly expensive due to its complex structure, which transmits a signal to a system including left and right amplifiers or a center and a woofer amplifier. There are a lot of restrictions on the installation, and to implement it in hardware, the development cost and the scale of the system are expanded, which causes a problem of portability.

Therefore, in the present invention, as shown in FIG. 4, the digital signal transmitted from the sound source is separated into left and right signals, modulated into an analog signal, and a part of the modulated signal is buffered (delayed) and then level reduced to generate buffer data. Thereafter, by mixing and demodulating the generated data and the other unbuffered modulated signal, and outputting the same, a method and a system for inducing an illusion in which an effect of 3D surround due to a delay time difference is generated are provided.

FIG. 5 illustrates a structure of a surround stereoscopic sound system through sound delay and level attenuation using the above characteristics. The present invention includes a master device 100 and a slave device 200, and a master device 100. Bluetooth chip set 10, which is a main control unit for controlling wireless connection and use with various types of Bluetooth devices by embedding a Bluetooth profile so as to receive a sound source from an external audio device in a Bluetooth manner, The Sub RF Chip Set 11 which manages the Caternet and wirelessly transmits the right signal of the audio signal to the slave device 200 and is controlled according to the control of Bluetooth, and the power management section ( Power management section (P) to separate audio and power used by each part to minimize and optimize mutual effects. ower management 12, an audio amplifier 13 for driving the speaker unit 15 by amplifying a signal received and reproduced wirelessly, and a signal amplified by the audio amplifier 13 Output speaker unit 15 and built-in lithium polymer charging circuit to increase portability, supply power through the charger when the charger is connected while the system is in use, and stop the system to start charging the charger to optimize the efficiency of use A sub-radio, which is composed of a charger and a supervisor 14, the slave device 200 operates as an automatic control to receive a signal transmitted from a sub RF chip set 11 of the master device 100. Sub RF Chip Set (11 ') and power management section to separate audio and power used by each part to minimize mutual influence A power management unit 12 'for adaptation, an audio amplifier 13' for driving the speaker unit 15 'by amplifying a signal received and reproduced wirelessly, and the audio amplifier The speaker unit 15 'which outputs the signal amplified by (13') and the lithium polymer charging circuit are built in to enhance portability. When the system is in use, the power is supplied through the charger. It is characterized by consisting of a battery charger and a supervisor 14 'to start charging to optimize the use efficiency.

Looking at the embodiment of the surround stereo sound system and its implementation method through the sound delay and level attenuation according to the present invention.

The present invention is a slave device that operates as an automatic control to receive a signal transmitted from the speaker unit 15 of the master device 100 and the Sub RF Chip Set 11 of the master device 100. The output sound delay time according to the signal transmission of the speaker unit 15 'of the slave device 200 which outputs the signal transmitted through the sub RF chip set 11' of 200 does not occur. In order to delay the sound transmitted to the speaker unit 15 of the master device 100, the effect of 3D surround may be provided.

In addition, the speaker unit 15 to which the signal amplified by the audio amplifier 13 of the master device 100 is output, and the speaker unit to which the signal amplified by the audio amplifier 13 'of the slave device 200 is output. Sub RF Chip Set which operates as an automatic control to receive a signal transmitted from the Sub RF Chip Set 11 of the master device 100 by the output sound by the 15 '. It is possible to prevent the sound delay time caused by the transmission between the 11 'and 11', and to prevent the speaker unit 15 of the master device 100 from being louder than the slave device 200. ') By the sub-wireless chipset to the volume of the radio transmitted by a certain ratio greater than the volume of the non-transmitted sound, it characterized in that the two output sounds can be felt the same. Will.

6A and 6B illustrate one embodiment of a wireless system to implement sound delay according to wired / wireless characteristics or to generate a sound delay on a wired side to match sound delay according to wired / wireless characteristics and to apply a three-dimensional sound system by attenuation. This is a block diagram showing that, when the signal transmission on the left and the right is different in wired and wireless, respectively, there is a delay of a certain time between transmission and restoration in digital transmission (or wired) and analog transmission (or wireless) in terms of sound configuration. It is possible to generate a 3D surround effect by maintaining such a delay time as an integer multiple, which is illustrated in FIG. 6A.

In this case, it is important to maintain an integer multiple of a certain time for the sound delay occurring during wireless transmission. As described above, the human body has an inversion of phase at a frequency corresponding to an integer multiple of a specific frequency due to the structure of hearing. Because it happens.

In addition, to compensate for the defect that the sound does not form in the middle between the two speakers according to the sound delay, Figure 6b is to compensate (compensate) the occurrence of sound delay between wired and wireless, the delay difference is provided by a separate buffer memory on the wired side It is shown that by delaying by the time that occurs relatively, the sound delay can be eliminated, which makes it possible to wire the signal (sound) of the radio transmission side separately to compensate for the sound that the radio transmission sounds to be less than the wire transmission sound. It is characterized in that it is provided to reproduce a certain ratio louder than the transmitted sound or to attenuate the level of the wired sound by a certain level.

7 is a schematic diagram showing the structure of the buffer method for implementing the sound delay time according to the present invention. In order to adjust the sound delay time to a constant or desired time zone, the wireless transmission data is not reproduced as a sound but buffered a certain amount. When the sound is played back, it is shown that the desired time can be adjusted constantly, and the delay time of the sound can be controlled by the buffer size (buffer memory and buffering data size).

As shown in FIG. 8, a method of implementing a surround stereoscopic sound system using sound delay and level attenuation includes a first step (1) of converting a digital signal from an audio source into an analog signal, and a buffer memory space for temporarily storing the converted signal. The second step (2) to be allocated, the third step (3) of analyzing the converted left signal by separating the converted signal into the left signal and the right signal, and the fourth step of analyzing the converted right signal ( 4) a fifth step (5) of detecting the right signal from the analyzed left signal and buffering it in the buffer memory to create a negative delay time, and detecting the left signal from the analyzed right signal and buffering it in the buffer memory. A sixth step (6), a seventh step (7) of initiating level attenuation with respect to the right signal output through buffering, and a level attenuation of a left signal output through buffering. Is an eighth step (8), a step (9) of mixing the level attenuated right signal and a left signal of the third step, and a step (10) of mixing the level attenuated left signal and a right signal of the fourth step (10). ), And outputting the mixed signal to the left in step 9 (11), and outputting the mixed signal to the right in step 10 (12).

In a method of implementing a surround stereophonic sound system through sound delay and level attenuation according to the present invention, a fifth step (5) of detecting a right signal from the analyzed left signal and buffering it in a buffer memory to create a delay time of a transmitted sound The sixth step (6) of detecting the left signal from the analyzed right signal and buffering it in the buffer memory is to create a negative delay time. The control of the delay time on each output side is based on the buffer memory and the buffer data size. There is a characteristic determined by.

The present invention separates a digital signal transmitted from a sound source into a left and right signal, modulates it into an analog signal, and detects and buffers the other side (right or left) signal from the modulated left or right signal, and then attenuates the buffer data. After generating each of them, by mixing and demodulating the unbuffered signal as the generated data and the same signal, and outputting it, it is possible to provide the effect of 3D surround due to the delay time difference.

Through the present invention, 3D surround system which realizes sound like 3D surround without using sound effect chip or software, and delay time generated by wireless transmission while transmitting only one left or right signal without additional hardware or software Like this, it is possible to provide a system by realizing sound.

In addition, if the output of the left and right speakers is the same, the volume of the two sounds is increased by a certain ratio greater than the volume of the untransmitted sound in order to prevent the relatively unheard of the wireless transmission. It is possible to maintain the same, and it is possible to provide a system that allows only one left or right signal to be transmitted wirelessly and reproduces at the same time without delay of the sound played between the two speakers.

As described above, the present invention has been described in detail with respect to preferred embodiments and specific structures and implementation methods, but within the technical scope of the present invention, various modifications and applications having substantially the same objects, configurations, and functions as those ultimately intended to be implemented are provided. It is obvious that such applications and modifications fall within the scope of the appended claims as long as such applications and modifications have substantial homogeneity in equivalent areas.

Claims (5)

What is claimed is: 1. A method of implementing surround stereophonic sound through sound delay and level attenuation output from a speaker; A first step (1) of converting a digital signal from a sound source into an analog signal; A second step (2) of allocating a buffer memory space for temporarily storing the converted signal; A third step (3) of dividing the converted signal into a left signal and a right signal to analyze the converted left signal; A fourth step (4) of analyzing the converted right signal; A fifth step (5) of detecting the right signal from the analyzed left signal and buffering it in the buffer memory; A sixth step (6) of detecting the left signal from the analyzed right signal and buffering it in the buffer memory; A seventh step (7) of initiating level attenuation for the right signal output through buffering; An eighth step (8) of initiating level attenuation with respect to the left signal output through buffering; Mixing (9) the level attenuated right signal with a left signal of a third step; Mixing (10) the level-attenuated left signal with a right signal of a fourth step; Outputting the mixed signal in step 9 to the left (11); A method of implementing a surround stereophonic sound system through sound delay and level attenuation, characterized in that it comprises a step (12) of outputting the mixed signal to the right in step 10. delete The method according to claim 1; Slave device 200 operating as an automatic control to receive a signal transmitted from a speaker unit 15 of master device 100 and a sub RF chip set 11 of master device 100. The master device does not generate an output sound delay time according to the signal transmission of the speaker unit 15 'of the slave device 200 which outputs a signal transmitted through the Sub RF Chip Set 11' A method of implementing a surround stereophonic sound system by delaying the sound and level attenuation, characterized in that the delayed sound output to the speaker unit 15 of the (100). The method according to claim 1; The speaker unit 15 to which the signal amplified by the audio amplifier 13 of the master device 100 is output, and the speaker unit 15 to which the signal amplified by the audio amplifier 13 'of the slave device 200 is output. Sub RF Chip Set which operates as an automatic control to receive a signal transmitted from the Sub RF Chip Set 11 of the master device 100 11 ') a method of implementing a surround stereophonic sound system through the sound delay and level attenuation, characterized in that the sound delay time does not occur according to the transmission between. The method according to claim 1; In order to prevent the speaker unit 15 of the master device 100 from being louder than the slave device 200, the sound that does not transmit the loudness of the sound wirelessly transmitted by the sub-radio chipset by the audio amplifier 13 '. A method of implementing a surround stereophonic sound system through a sound delay and attenuation, characterized in that a predetermined ratio greater than the size of the sound, so as to feel the same volume of the two output sound.

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