TWI262738B - Expansion method of multi-channel panoramic audio effect - Google Patents

Abstract

An expansion method of multi-channel panoramic audio effect is disclosed, which comprises first reading a two-channel stereo sound source signal and using Hafler technology to expand the stereo sound source signal into audio signals of five channels including a left-front channel, a right-front channel, a front-central channel, a left-rear channel, a right-rear channel; then generating the residual sound like echo from the left-rear channel and the right-rear channel by the residual sound technology; and finally delaying the left-rear channel and the right-rear channel for a first duration, and moving up the front-central channel for the second duration, so as to emphasize the audio effect of the front audio field and human sound significantly, thereby accomplishing the purpose of 3D audio effect for the listener to experience personally.

Description

1262738 . V. INSTRUCTION DESCRIPTION (1) Technical Field of the Invention The present invention relates to a multi-channel ring field sound effect expansion method, and more particularly to a use of an Humf in a video playback software for a personal computer. 1 er) technology, audio filtering technology and sound reverberation technology, the method of expanding the stereo two-channel sound source into a multi-channel ring field sound effect. [Prior Art] Press, with the advancement of information and computer technology, electronic products are constantly improving the effect of entertainment and transportation under the trend of light, short, multi-functional, fast speed, making the personal computer (p C) The dual use of work and entertainment 'based on the innovation of the industry, coupled with the popularity of Dvd ROM in recent years' allows the DVD multi-channel home theater playback system to be implemented in the PC, so as long as the PC has a multi-channel sound card, The DVd *AC3 5. 1 channel output can be played. With the current computing power of the PC, the software has been able to play DVDs smoothly, and the output of 5.1 channels can be divided into: left front, right front, left rear, right rear, center speaker and super bass. The sound field, but not all video media (such as VCD) provide 5 · 1 channel output, generally stereo two-channel sound signal, in order to make multi-channel π eight sound, most of them only provide mixing or The sound mode is copied to the multi-channel, and there is no loop sound effect. Therefore, some sound effects cards in the studio use some sound effect 3D positioning technology, such as HRTF (Head Related Transfer Function) technology, which separates the sound phase of the original two-channel sound source and separates the sounds of different angular orientations.

1262738 V. Invention description (2) and use special mixing decoding function, use DSP to copy the sound that can deceive the human ear, including the sound size difference of IAD-left and right channels, the sound of iTD left and right channels Time difference and frequency response - produces a sense of height and rear sound. However, the use of HRTF technology will involve the issue of royalties, and the additional cost of the HRTF Library will be required. In addition, the HRTF technology requires the use of special audio chips, so that the high-end four-channel sound effects are compliant. not cheap. In the conventional audio amplifiers, most of them use the Hafler technology. The principle is the invention patent of the 3rd, 697, and 6 92. The original two channels are left by hardware. The sound signal of channel L and right channel (eight) is simulated into four-channel or five-channel sound field output, that is, plus left rear sound (LR), right rear channel (R-L) and front The center channel (L + R) /2, the wheel haul (Ha f 1 e ) r is a very practical technology for the traditional sound amplifier to produce the ring field sound.

Due to the aforementioned method of the body to achieve the soft wave technology on the ring PC, sometimes the left and right channels of the left and right channels will use the Hansler (Η 监 4 monitors here, the channel It is inconvenient to use a PC technology to make the stereo mode of the field to make the left sound signal af1er. The use of the case and the lack of use in the traditional audio amplifier, the use of hard sound does not cause any problems, but in the use of The Hafjer technology or audio filter, the right rear channel can not sound, because the same number, (LR) and (RL) will cancel the sound without sound. Therefore, it is generally not technical and audio filtering technology on p C. The Ming people are trying to solve the above-mentioned existing PCs and expand the research and cooperate with the theory of Hafler technology and audio filtering technology.

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V. Description of the invention (3) Sounding the sound, so that the method of stereoscopic two-effect on the PC is a design and sound algorithm. The sound source generated by the feedback delay network can be expanded into a multi-channel ring sound and is effective. The invention of the above missing. SUMMARY OF THE INVENTION The main technical feature of the invention is to provide a multi-channel ring field sound, which is first read from a video medium by a stereo source signal, = 3 has a left sound signal (L) and a right Sound signal (〇, using the Hafl er technology to expand the stereo source signal into a left front channel (Front L), a right front channel (Fr〇nt r), a front center channel (Fron +t M), a left rear channel (Real L) and a right rear channel (Reai R), a five-channel sound signal output, and then the left rear channel (Real L) and the sound reverberation technique The right rear channel (Reai r) produces a reverberant sound like an echo. 'Last delay of the left rear channel (Real L) and the right rear channel (Real R) - the first time value, in advance of the front central sound Road (Fr〇nt Μ) - the second time value to highlight the sound effect of the front sound field and vocals to achieve the effect of the listener's immersive 3D sound effect. The second technical feature of the present invention is to provide the above The multi-channel ring field sound effect expansion method is to add high and high frequency instrument sounds and human voices by audio filtering technology. Separating the left front channel (jrront L) and the right front channel (Front R) with a high-pass filtering operation to remove the low-frequency sound signal, and the front center channel (Front M) is filtered by low-pass filtering. In addition to the sound signal of the instrument, the left rear channel (Real L) and the right rear channel (Reai R) also filter the high frequency sound signal by low-pass filtering operation to achieve different music in the sound signal.

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The dog shows the effect of the sound effect of the stereoscopic 3D scene sound that the listener is immersed in.弋 ί ί tf $ · 术 特征 在于 提供 提供 提供 提供 提供 提供 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 种 多 多 多 多 多 多 多, the right front channel (Fr〇nt R) = the right sound signal minus the left sound money (R_L) signal output, the left channel (Real L) is directly rotated by the left sound signal (L), and the Right rear = j (Real R) is directly output by the right sound signal (R), and finally the front = center channel (Front M) is also the average value of the left sound signal and the right sound signal 彳 5 5 tiger (L + R) / 2 output, so that the sound of the high-frequency instrument can be highlighted behind the listener or the left and right, not the front, so that the listener = placed on the stage to achieve another experience The sound field of its environment sees its effect. 〜 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施The purpose, features, and characteristics of the present invention are to be understood as being in the nature of the invention. — Clear is shown in the first figure, which is the system architecture diagram of the present invention, and the second figure is a schematic diagram of the expansion process of the multi-channel ring field sound effect of the present invention. When the main I B + ^ is used on the personal computer (PC) 10, the audio and video media can be played. ^ The stereo two-channel sound is softly expanded into a multi-channel surround sound.

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Secondly, most of the PC10 on the PC10 is equipped with a CD player media, such as a VCD or DVD video media disc, or can be accessed by ^H^ft30^WAV ^MIDI ^AUD ^MP3 ^MPEG^ ^ ' Ring field sound mode. When the invention is used on PC1Q, the PciQf is equipped with multi-channel] sound 2: U:, and the multi-channel sound card can be output to multiple speakers, such as 4· ear t · 良良道, 6.1 The channel, the 8.1 channel, and even more channels, etc., the present invention expands the original two-channel source into a multi-channel ring field in the form of audio-visual playback software. The channel is implemented for the second month, and the 5th and 5th channels are as shown in the third figure. The listener is located at the center of each channel as the reference point, and mainly includes the left front channel (Fr〇nt L). The right month ij channel (Front R) 13, the front center channel (Fr〇nt M) 14, the left rear channel (Real L) 15, and the right rear channel (Reai R) i6. The present invention needs to first acquire a stereo sound source signal (100) from an audio-visual medium such as a VCD disc 20 or an MP3 file 30. The stereo sound source signal includes a left sound signal (L) and a right sound signal (1, the present invention The stereo sound source signal is expanded into a five-channel sound signal output (101) by using Hafler technology. The left front channel (Fr〇nt l) 12 is directly output by the left sound signal (L). The right front channel (Fr〇n1; R) 13 is directly output by the right sound signal (R), and the front center channel (Fr〇nt M) i4 is an average signal of the left sound signal and the right sound signal ( L + R) / 2 output, the left rear channel (Real L) 15 is output by the left sound signal minus the right sound signal (LR) and the right rear channel (Rea! R) 16 is derived from the right sound signal Subtract the left sound

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Signal (R-L) output. It can be seen from the above-mentioned prior art that the left rear channel (Real L) 15 and the right rear channel (Real R) 16 are generated by the difference signal between the left sound signal (L) and the right sound signal (R). However, if the left sound signal (L) is the same as the right sound signal (R), the left rear channel (reai L) 丨 5 and the right rear channel (Real R) 16 cancel each other to produce a silent clear shape. Therefore, the present invention utilizes a sound reverberation technique to generate a reverberant sound such as an echo through the sound reverberation operation of each of the left rear channel (Real L) 15 and the right rear channel (Real R) 16 (102). In order to avoid the left rear channel (Real L) 15 and the right rear channel Re (Real R) 16 cancel each other, thereby achieving a relatively wide auditory space. The Delay network technology matrix 42 has two kinds of delays and a constant delay. The moment of the moment is the moment of the sounder 41 and the intention. The sound sound reverberation network is attached to each of the signals, and the different delay values 43 are set to be non-phase-arrayed in the feedback signal. The fifth-order invention is the arithmetic system of the sound signal. , FDN) 40 technology one channel provides the sound signal of the channel, and the delay is different, and the delay can be formed into the continuous array 42 respectively, as shown in the figure, which highlights the different instruments back. Delayed network (Feedback, as shown in Figure 4, the feedback delay has two delays of the array 41 and a column of the number 4 input to the delay of the stator 4 to produce each delay array 41 The delay time generated by the column 4 1 can be set between 2 and 10 ms, and then the input end of the column 4 1 is used to finally add the reverberation sound. The software is generated by the operation. The sound of each channel of the invention is filtered to show the stereoscopic 3D sound of the channel, so the sound is separated, for example, the sound is high.

!262738 V. Invention description ^ ' " -------- The sound of the music, the voice of the front or the front right channel, the voice of the person is declared by the front center: 兮 + : sound The lower instrument sound is emitted by the rear channel, so the speech, the front channel (Front) 12 and the front front channel (Front R) 13 filter the low frequency sound signal (103) by the wave operation, and the high pass filter The different filter and wave frequency response are around -10dB, around 6 KHz. The p/v heart, the center channel (Front M) 14 is used as a low-pass filter to calculate the sound signal (104), and the filter frequency response is about -30 dB, near the HZ, and the left rear sound Real L 15 and the right rear channel (Reai and 16 also filter the high frequency sound signal (丨〇5) with low-pass filtering operation, and the filter response is about -3〇dB, around 10KHz. In this way, the sounds of different market states can be separated, and the high-pass filtering operation and the low-pass wave operation can be achieved by software. Then, in order to further highlight the sound of the instrument and the part of the human voice of the front channel, the present invention is Delaying the sound signals of the left rear channel (Real l) 15 and the right rear channel (Real R) i6 by a first time value (1〇6), such as 1〇~2〇 milliseconds (ms), and The front center channel (Fr〇nt m) 14 is advanced by a second time value (107), such as 2 to 4 milliseconds (ms), so that the listener can enjoy the 3D sound effect of the concert in person. The multi-channel sound effect of the invention further includes a subwoofer channel, and the subwoofer channel is the same as the conventional mode, and a low pass is utilized. The filtering operation filters out the high-frequency sound signals of the left sound signal (L) and the right sound signal (R), and the filtered frequency response is about -3OdB, near 120Hz, so that the 5.1 channel can be formed. The channel is added with a rear center channel at the center of the listener, and the rear center channel is the left rear channel.

Page 10 1262738 V. Inventive Note (8) (Real L) 15 and the average signal of the right rear channel (Real R) 16, that is, the signal output of (RL + RR)/2. Also, '8 channels are suitable for occasions where the listening environment is large. Add a left channel (Middle L) and a right channel (Middle R) to the left and right sides of the listener. The left channel (kiddie L) may be a copy channel of the left rear sound (Real L), and the right channel (MidcUe R) may be a copy channel of the right rear channel (Real R). For the same reason, if you are in a larger listening environment, you can add more left and right channels to average the sound volume of the entire listening environment. The eye is shown in the sixth figure, which is a schematic diagram of the sound field arrangement and sound filtering of the ring field according to the second embodiment of the present invention. In this embodiment, the stereo source signal is also expanded into a five-channel sound signal output by using the Hafler technology, but the output mode is different, and the left front channel (Fr〇nt L) 12 is The left sound signal is subtracted from the signal output of the right sound signal, and the right front channel (Front R) 13 is outputted by the right sound signal minus the signal of the left sound signal (RL), and the left rear channel (Reai) 15 Direct output by the left sound signal (L) and direct output of the right rear channel (Real R) 16 by the right sound signal (R). Finally, the front center channel (Front M) 14 is also left by the left The sound signal and the average signal of the right sound signal (L + R)/2 are output. Similarly, the present invention has the left front channel (F r ο nt L ) 1 2 and the right front channel (Front F013 is filtered by a low-pass filtering operation to filter high-frequency sound signals) whose filter frequency response is about -30 dB. , 1 near OKHz, the left rear channel (Real L) 15 and the right rear channel (Real R) 16 are subjected to a high-pass chopping operation

Page 11 1262738 V. INSTRUCTIONS (9) Filtering and removing low frequency sound signals, the filtering frequency response is about -丨〇dB, around 6KHz. And the sound signal of the left rear channel (Real L) 15 and the right rear channel (Reai R) 16 is also delayed by 1 〇 2 〇 milliseconds (ms), and the front center channel (Front M 14 rules 2 to 4 milliseconds (ms), this arrangement can be different from the traditional listening effect, highlighting the high-frequency instrument sound behind the listener rather than the front, so that the listener is placed on the stage, very Suitable for some Karaoke K or KTV occasions, creating an immersive sound field feel.

, the job of 'the invention can indeed use the above-disclosed technology to provide a design that is different from the well-known person, can improve the overall use value, and it has not been seen in the publication or publicly used before the application, since the invention has been invented The patent requirements, 提出 filed an invention patent application in accordance with the law. However, the above-mentioned drawings and descriptions are merely examples of the present invention. Those skilled in the art can make other various changes according to the above description, which still belong to the inventive spirit of the present invention and the following boundaries.

Page 12 1262738 Brief description of the drawing [Simple description of the schema] (1) Schematic description: The first diagram is the system architecture diagram of the present invention; the second diagram is the schematic diagram of the multi-channel sound effect expansion process of the present invention; The three figures are schematic diagrams of the position distribution of the five-channel embodiment of the present invention; the fourth figure is the schematic diagram of the structure of the feedback delay network (FDN) of the present invention.

The fifth figure is a schematic diagram of the sound filtering of each channel of the present invention; and the sixth figure is a schematic diagram of the sound field arrangement and sound filtering of the ring field according to the second embodiment of the present invention. (2) Representative symbols of the main part:

Personal computer (PC) 10 Audio card 11 Left front channel (Front L) 12 Right front channel (Front R) 13 Front center channel (Front Μ) 14 Left rear channel (Real L) 15 Right rear channel (Real R) 16 Disc playback media 20 Video media files 30 Feedback delay network 40 Delay queue 41 Array matrix 42

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Claims (1)

1262738 —— ----; _ /, 申 凊 patent scope 1 · A multi-channel ring field sound effect expansion method, comprising the following steps: reading a stereo sound source signal, including a left sound signal (L) and a Right sound signal (R); Extended side stereo source signal is a left front channel (Front L), a right channel (Front R), a front center channel (Front M), a left rear channel (Real) L) and a right rear channel (Real R) multi-channel sound signal; The sound signal of the left front channel (Front L), the right front channel (Front R) or the left rear channel (Real L) and the right rear channel (Real R) is subjected to a voice reverberation operation to generate an echo residual. Sounds the sound; delays the left rear channel (Real L) and the right rear channel (Real R) - the first time value; and advances the front center channel (Front M) - the second time value. 2. The multi-channel ring field sound effect expansion method as described in claim 1, wherein the step of expanding the stereo sound source signal into a multi-channel sound signal uses a Hafler technique to make the left front sound The front (Front L) is directly output by the left sound signal (L), and the right front channel (Front R) is directly outputted by the right sound signal (R), and the left rear channel (Real L) is subtracted from the left sound signal. The right sound signal (LR) is output, and the right rear channel (Real R) is output by the right sound signal minus the left sound signal (RL). 3. The multi-channel ring field sound effect expansion method as described in claim 2, wherein the left front channel (Front L) and the right front channel (FrontR) are filtered by a high-pass filter to filter out low frequency sound signals. . 4. Multi-channel ring field sound effect extension as described in item 3 of the patent application scope. Page 15 1262738 Patent application scope, service, back » ' /, the filter frequency response of the high-pass filter operation is about -1 〇 dB, around 6KHz. 5 · The multi-channel surround sound effect expansion method described in the second paragraph of the patent scope of the patent. The front center channel (Front M) is filtered by a low-pass filter to filter high-frequency sound signals. 6. The multi-channel ring field sound effect extension/description as described in claim 5, wherein the filter frequency response of the low-pass filtering operation is approximately -30 dB, 6 KHz. 7 · The multi-channel ring field sound effect expansion method described in the second paragraph of the patent scope of the patent, wherein the left rear channel (Real L) and the right rear channel (Real R) are subjected to a low-pass wave operation Filter out high frequency sound signals. 8. The multi-channel ring field sound effect expansion method as described in claim 7 wherein the filter frequency response of the low-pass filter operation is approximately -30 dB, near ΙΟΚΗζ. 9. The multi-channel surround sound effect expansion method as described in claim 1 wherein the step of expanding the stereo sound source signal into a multi-channel sound signal uses a round of Hafler technique to the left front channel (Front L) minus the signal output of the right sound signal (L - R) by the left-handed sound 彳 § 'The front right channel (Front R) subtracts the signal of the left sound signal (RL) from the right sound signal Output, the left rear channel (Real L) is directly output by the left sound signal (L), and the right rear channel (Real R) is directly output by the right sound signal (R). 1 0. The multi-channel surround sound effect expansion method according to claim 9, wherein the left front channel (Front L) and the right front channel (Front R) system 1262738 Six' patent application scope ~---- Filter the high-frequency sound signal through a low-pass filter operation. The multi-channel ring field sound effect expansion method described in item 10 of the patent scope, and the filter frequency response of the low-pass filter operation in the middle is about _3 〇ά β, 1 Ο Κ Η z. 1 2. The multi-channel ring field sound effect expansion method according to claim 9, wherein the front center channel (Fr〇nt Μ) filters out the high frequency sound signal through a low pass filtering operation. 1 3 · The multi-channel ring field sound effect expansion method as described in claim 12 of the patent application, wherein the filter frequency response of the low-pass filter operation is approximately -30 dB, 6 KHz. 14. The multi-channel ring field sound effect expansion method as described in claim 9 wherein the left rear channel (Reai L) and the right rear channel (Real R) are filtered by a high-pass filter to filter out low frequencies. Sound signal. 1 5 · The multi-channel ring field sound effect expansion method as described in claim 4, wherein the filter frequency response of the low-pass filter operation is about -10 dB, 6 KHz. The multi-channel ring field sound effect expansion method of claim 1, wherein the multi-channel sound signal further comprises a subwoofer channel. The multi-channel ring field sound effect expansion method according to claim 16, wherein the subwoofer channel uses at least one low-pass filtering operation to convert the left sound signal (L) and the right sound signal ( The high frequency sound signal of R) is filtered out. 1 8. The multi-channel ring field sound effect expansion method according to claim 1, wherein the front center channel (j?r〇nt M) is the left sound heart number (1〇 and the right) The average signal of the sound signal (R) is the signal of (L + R)/2 1262738 Out. 19. The multi-channel surround sound method as described in the scope of the patent application, wherein the multi-channel acoustic signal further comprises a rear central channel exhibitor 20. As described in claim 19, The channel ring field sound expansion method bites, and the rear center channel is the average signal of the left rear channel (Reai L) and the right rear channel (Real R), that is, (RL + RR)/ The signal transmission of 2 is 0. The multi-channel surround sound effect expansion method as described in claim 1, wherein the multi-channel sound signal further includes at least one left channel (M^die L) and At least one right channel (Middle R). 2 2. The multi-channel ring field sound effect expansion method according to claim 21, wherein the left channel (Middle L) is a copy channel of the left rear channel (R=al L), The right channel (Middle R) is the copy channel of the right rear channel (Real R). 23. The multi-channel ring field sound effect expansion method of claim 1, wherein the delaying the first time value may be 10 to 20 milliseconds (ms). 24. The multi-channel surround sound effect expansion method of claim 1, wherein the delaying the second time value may be 2 to 4 milliseconds (ms). The multi-channel surround sound effect expansion method described in claim 1, wherein the sound reverberation operation is a Feedback Delay Networks (FDN) technology. 2 6 . The multi-channel ring field sound effect expansion method as described in claim 25, wherein the feedback delay network technology is to provide a complex delay 伫 器 and a 伫 column matrix, The sound signal is input to the delay queue Page 18 1262738 VI. Applying for a patent range device, generating a complex delay signal, and then feeding back to the delay queue by the matrix of the array, and finally adding the sound signal to the channel to form a continuously-returned residual Sounds loud. 2 7. The multi-channel ring field sound effect expansion method according to claim 26, wherein the delay signal generated by the delay register is set by a delay constant value of the delay 伫 所The delay time. 2 8. The multi-channel ring field sound effect expansion method according to claim 26, wherein the delay time generated by the delay trainer is different. Page 19