TW576121B - Automobile sound system and method of sound reproduction - Google Patents

Description

576121 A7

V. Description of the invention Background of the invention 1) Field of the invention The field of the invention is related to sound reproduction, especially to the speaker configuration and phase used in the sound system of cars or vehicles. 2) Yili audio system is common in cars and other vehicles. . Such systems generally use multi-channel systems ranging from simple broadcasts to fairly complex stereo program sources, or CD and audio record players, and are used with multiple equalizers, preamps, and power amplifiers. Although the configuration and components of conventional car audio systems vary widely, most of them face the existing problems of providing the highest sound quality to varying degrees. These problems are due to the special car sound environment compared to good audiovisual rooms. The shortcomings are as follows: • The internal volume is too low, which results in a decrease in reflection time, and the low modal density at low frequencies causes a low atmosphere and unstable bass response. • The proximity of the radon reflecting surface (such as a car window) and the radon absorbing surface (such as the car interior or clothing) results in a large frequency difference and the position of the head of the direct or indirect sound that reaches the listener. So even slight changes in head or seat position can lead to significant and unexpected changes in music sound quality. • The listening position needs to be limited by the seat position (typically 4 or 5) and they are also very asymmetric with respect to the speaker position. Space is often a priority in the car, so speakers are often placed for convenience, such as at the pedals and the bottom of the front and rear side doors. Most of them are not good from an audio point of view. As a result, the listener ’s head is often very close to the left or right speaker, resulting in a direct large internal channel time difference and sound. -5-: This paper size applies to China National Standard (CNS) A4 (210X 297 mm) 576121 A7

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The effect of thinking ”does not provide a stable f image, because the problems related to the aforementioned stability have not been resolved. The considerable additional costs of such design orientations are often undesirable in the automotive industry with high cost sensitivity and competitiveness. In addition, as mentioned above, the internal space of a car is often a priority consideration, which limits the optimal speaker position. Therefore, the advantage is that how to provide an improved car sound system can overcome-or more of the aforementioned problems or disadvantages, and provide Improve the sound quality while minimizing the cost of the audio system. SUMMARY OF THE INVENTION The present invention, which is generally directed to a car sound system, includes a speaker configuration, a speaker position, and a sound processing combination. In the embodiment, the undesired sound effect due to the undefined position of the listener and the speaker is minimized, and more uniform sound effects are provided to all passengers. In one or more specific embodiments, the car sound regeneration system includes _ For speakers that are closely adjacent and located in front of the console or dashboard, the geometric center is on the symmetrical center axis of the vehicle (or as close as possible). The sound reproduction system also includes an audio signal to the speaker pair. The sound processor is better. Since the left and right center speakers are effectively adjacent to each other, the sound information can be arrived at The time difference is minimized, and the relative volume of the two speakers remains nearly the same. In addition, both left and right passengers can feel from the center speaker pair, with almost the same volume, and the direct to indirect sound ratio is minimized. According to a preferred embodiment The sound processor uses the interactive cancellation technology to "extend" the sound and image produced by two closely spaced speakers. For example: the cancellation signal is estimated from the difference between the left and right channels. The difference signal is added to the left of the paper. Standard (CNS) M specifications (21〇297 public love) -------

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5. Description of the invention (

In front of the right channel with the opposite polarity, the channel is scaled, delayed (if necessary), and changed in spectrum. This spectrum change of differential channels is better for low-frequency boosting within a specific frequency range. After correcting the difference (when the low-frequency signals of each channel are similar, it will cause bass loss), and restore the correct tone contrast. . Can add phase compensation all-pass network in the difference channel, and correct the extra phase offset often caused by the lowest phase offset spectrum changing circuit, so that the correct phase relationship between the cancelling signal and the direct signal can be at the desired frequency The range remains unchanged.

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576121 A7 B7 V. Description of the Invention (5) luxury car), a pair of front center speakers can be used in the driver's and passenger compartments, the latter can be used in rear seats, music videos or movies with multi-channel surround sound effects Audiovisual performances. Further specific embodiments, changes and enhancements are also described here. Description of the Drawings Figure i is a preferred car sound system diagram according to one or more embodiments disclosed herein. Figure 2A is a front sectional view of a preferred speaker box for a pair of stereo speakers. Fig. 2B is a cross-sectional view of the speaker box shown in Fig. 2A. Fig. 2C is an oblique front view of the speaker box shown in Figs. 2A and 2B. FIG. 2D is an explanatory diagram of sound reflection from a downward-facing speaker, such as the speaker in the speaker box of FIGS. 2A-2C. FIG. 3 is a block diagram of a sound processing system according to one or more embodiments disclosed herein. Figure 4 is a more detailed illustration of a sound processing system. Fig. 5 is a diagram of a sound processing system for explaining a transfer function. Fig. 6 is a sound system diagram according to the general principles of the systems shown in Figs. 4 and 5, and is applicable to the organization of a ring field sound system. Figures 7A and 7B are examples of frequency response and phase conversion functions in the sound processing system according to Figure 5, which also have spectral weight, equalization, and phase compensation characteristics. Figure 8 is a diagram of the sound field system of a car or other vehicle. 9A, 9B and 9C are diagrams illustrating possible placement positions of a pair of center speakers. Figure 10 is a diagram of a sound processor using a linear spectral weighting filter. Figure 11 is a car sound system that provides greatly improved extreme left / right sound. -9-This paper size is in accordance with China National Standard (CNS) A4 (210X 297 mm)

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Line 576121 A7 B7 V. Description of the invention (

An example block diagram of a system connected to closely-spaced pairs of CPUs. FIG. 12 is a diagram for explaining the relationship between the loud cry interval and the difference channel gain in the specific embodiments disclosed herein. One stomach = 1 Fig. 13) · Qi 4 M U-pass tool ring field sound system is another-specific embodiment diagram. , And UA and 14B are used to compare the speaker position and the audio effect diagram of the sound processing among the previous embodiments of the specific embodiments disclosed herein. Figures 15-1, 15-2, and 15-3 are examples of gain and / or phase transfer functions of the sound processing system according to Figure 16. Figure 6 is a diagram of the sound processing system with the layout shown in Figure 4, and it also shows the possible transfer function characteristics for some processing blocks. Detailed Description of the Preferred Embodiment FIG. 1 is a diagram of a preferred car sound system 100 according to one or more embodiments disclosed herein. In FIG. 1, two speakers 114, 115 are closely adjacent and receive and respond to audio signals 132 and 133 from the sound processor 108, respectively. Loudspeaker states 114 and 115 are better for left and right speakers, which can be basically (but not necessarily) the same, and as further described here, the spacing is' in addition, it can be of any appropriate size and model, which can be obtained in accordance with Car area or other space size restrictions. Furthermore, the speakers 114, 115 may be located on or near the center axis of the interior of the car, such as above the center of a center console or dashboard, or on a central island between the driver and passenger seats. The sound processor 108 receives audio input signals 102 and 103 from a suitable audio signal source 05, which is from any typical car audio component (eg, CD player, cassette player, radio, etc.). Audio input signal 102, -10- This paper standard is applicable to China Standard (CNS) A4 specification (21C) χ 297 公 董-) —

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Line V. Description of the invention (7 A7 B7 can be derived from any audio product, including any media received by the audio system (such as audio tapes, CDs, or any digital audio building or Ho ...), Quan (such as (Code wire) broadcast. The sound processor 108 is described in more detail here. The technical processing of the body sound signal n 103 is more detailed, and provides processed L f 1/2, 133 (in any desired After amplification or level shift) to closely spaced speaker pairs 114, U5. If necessary, the stereo signal 102, 103 can also be processed directly or, `` two sounds '' to 118 (if some additional Or complementary sound processing) is fed to its L-added speaker states, such as left speaker 124 and right speaker 125 shown in Figure 丨. In a preferred embodiment, the sound processor 108 is used to "extend, The sound image is in the wider sensing area, which is taken from the difference between the two audio channels 102 and 103, and the frequency difference crosses the middle difference signal, and then after the size adjustment, it is added to the left and right channels with appropriate polarity. When the speaker When the positions of n4 and 115 are different, the obtained phenomenon makes the stereo sound and video display , Even if the speakers 114, 115 are closely adjacent. The bass boost or spectral weighting performed by the sound processor 108 may cause phase shifts, which can be compensated using phase equalization. It can be used along the audio before mixing (that is, interactive cancellation). Channels 102 and 103 perform complementary phase compensation, so that the left and right audio channels 102 and 103 are approximately in phase with the difference signal of the spectrum change. Linear phase filtering is used to make bass boost or spectrum weighting unnecessary or undesired. However, equal delay is added. The left and right audio channel paths are better, 俾 compensate for the additional delay caused by the linear phase equalizer in the difference channels. The main purpose of the speakers 114, 115 is not to provide mono information only as is the case with conventional center speakers (although Mono information can be fed to the speakers 114, 115), and when processed and mixed with the appropriate mid-high frequency (by the sound processor 108), -11-This paper size applies to the Chinese National Standard (CNS ) A4 size (210 X 297 mm) 576121 A7 ___ —_ B7 V. Description of the invention ^ ^ ^ Body presentation, has nothing to do with the listening axis. An Because the two central speakers U4, 115 are closely spaced, the time difference between the sound information arriving at each listener is the lowest, and the relative perception of each listener from the two speakers: the amount is also nearly the same In addition, the left and right passengers feel that they are almost the same from the center speaker, and the amount of 1151 is almost the same. In the situation that the closely adjacent speakers cannot emit powerful large reverse and low-frequency components due to interactive cancellation processing, low-pass filtering can be used The device isolates too low frequencies and leads it to the isolated subwoofer. At the same time, the corresponding high-pass filter can be used to avoid high-level and low-frequency signals overloading smaller speakers. For the relatively small center speakers 1M and U5, any low-head audio section is not easy to control. The left and right audio channels 10 and 10 can be fed to the left and right low-g wheel speakers 121 and 122, and can be combined. Any other suitable device provided by the sound processor mg Ge provides medium / high frequency attenuation and / or low / low audio boost. In the specific embodiment where the middle / high frequency is output from the closely-spaced center speaker pair, and the bass or low frequency is output from the speaker inlaid on the left and right door, the louder volume can be achieved with a lower% source, so it is amplified. Efficiency advantages. When the speakers 114 and 115 are located on the front console or dashboard, or on or near the center axis of the car, they can be fixed (but not necessarily) high enough to be relatively undisturbed from the ears of the listener It eliminates the wrapping or mitigation of obstacles such as seats and passengers. In such a specific embodiment, the speakers 114, 115 are located at an ideal or at least better audio position, which has lower obstacles and reflections, and can make the sound spreading space larger. Details of preferred technical aspects of a sound processor connected to closely spaced speakers will be described. Figure 3 is the sound processing system according to the specific embodiment disclosed here. -12- This paper size is suitable for towels, S Standards (CNS) A4 specifications (210 X 297 public love 1 —

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Line 576121 A7 __B7_ V. Description of the invention (9) System 300 block diagram, for example, can be connected to the car sound system 100 and speaker configuration of Figure 1, or more broadly, to provide stereo source signals in any multi-audio channel Sound system. As shown in Fig. 3, a left-frequency signal 311 and a right-audio signal 312 are supplied to the sound processor 310, and then supplied to closely spaced speaker pairs 324, 325. The left-frequency signal 311 and the right audio signal 312 can also be supplied to the left and right (ring field or non-ring field) speakers, which are not shown in FIG. 3. In a preferred embodiment, the sound processor 310 generates the spectrum weight difference signals from the left and right channel audio signals 311 and 312, and sends the spectrum weight difference signals before sending the obtained signals to the speaker pairs 324 and 325. (Adjusted with proper polarity) Mix with left and right channel audio signals 311 and 312 to provide interactive cancellation effect, thereby expanding the sound image produced by speakers 324 and 325, even if the speaker pairs 324 and 325 are closely adjacent, it can also Provides stereo effect. FIG. 4 is a detailed illustration of a sound processing system 400 according to the principles disclosed herein. For example, it can be used in conjunction with the car sound system 100 of FIG. 1 and the speaker configuration, or more broadly, to provide a stereo source in any multi-audio channel. Signal sound system. In the sound processing system 400 of Fig. 4, a left audio signal 411 and a right audio signal 412 are provided from an audio source and can be fed to other speakers (not shown in Fig. 4). The difference between the left audio signal 411 and the right audio signal 412 is obtained by the subtractor 440, and the difference signal 441 is fed to the spectrum weight filter 442, where the difference signal 441 is given a spectrum weight (which may be a gain factor). The characteristics of the spectral weighting filter 442 may vary depending on several factors, including the desired auditory effect, the spacing of the speakers 424, 425, and the likes and dislikes of the listener. The spectral weight filter 442 can be output to a phase equalizer 445 to compensate for a phase offset (such as non-linearity) caused by the spectral weight filter 442. -13- This paper size applies to China National Standard (CNS) A4 (210X 297mm)

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Line 576121 A7 B7 V. Description of the Invention (Π) In a preferred embodiment, the input signals XI and χ2 are the ZO-conversion of the left and right audio channel inputs, while Υ1 and Υ2 are the table and feed closely adjacent The left and right channel outputs of a speaker pair (such as left and right speakers) correspond to Z-conversion. The conversion functions A, A, and B can be expressed in terms of ζ terms, and are partially determined by the sampling frequency Fs related to processing in the digital domain. According to a specific embodiment, blocks 555 and 556 are second-stage all-pass filters with f = 3200Hz and Q = 0.12. In one example, the following transfer function characteristics can be present according to a representative example of the sampling frequency Fs. : For Fs = 48 KHz, 0.2578123-0.6780222Z · 1 + f2 A (z) 1-0.6780222 ^^-0.2578123 ^ For Fs = 44.1 KHz, A (z): 0.2944196-0.633509 Factory 1 + Factory 2 1- 0.633509Z * 1-0.2944196ζ'2 for Fs = 32 KHz, 0.4201395-0.469117 1-0.469117 Factory 1-0.4201395 Factory 2 In this specific embodiment, the block 560 may be 0 dB at low frequency and The first stage with cut-off frequencies of 200 Hz and 2 KHz is connected in series with the second-stage all-pass filter (f = 125 Hz, Q = 0.12). In one example, it can be based on the representativeness of the sampling frequency Fs. For example, the following conversion function characteristics exist: For Fs = 48 KHz,…, 0.1116288-0.0857871 factory 1 0.8723543-1.872104 factory + z_2 B (z) = G χ-: -χ l-0.9741583z · 1-1.872104 factory 1 + 0.8723543 Factory 2 pairs of Fs = 44.1 KHz, -17- This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm) 576121 A7 B7 Description of the invention 1 0.814462-1.813915 ^ 1 + factory 2 B (z) -Gx ---; -x-; -Γ Bu 0.9614863 factory 1 1-1.813915 factory 1 + 0.814462 ^ 2 may also include a gain term in block 560, or It can be in the same path as different blocks or components. The gain value can be determined by experiments on a specific application, but the average period is generally optimized in the range of 10-15 dB. For example, a specific In the embodiment, the gain term is 12 dB. Figs. 7A and 7B are examples of frequency response and phase conversion functions of the sound processing system according to Fig. 5, and they have special spectral weighting, equalization, and phase compensation characteristics. FIG. 7A illustrates a frequency response conversion function 702 and a phase conversion function 705 for a B / A, which are conversion functions of a difference channel (−B) and a first input channel (XI) with a gain of + 12 dB. As shown in FIG. 7A, the frequency response conversion function 702 has a relatively smooth gain in the first region 710 of the fundamental frequency (in this example, up to about 200 Hz), and the gain decreases in the second region 711 of the intermediate frequency (in In this example, from about 2000 Hz to about 2 KHz) 'and the gain in the third region 712 of the high frequency is quite flat again (up to about 2 KHz in this example). The phase response transfer function 705 refers to that in the second region 711 of the intermediate frequency (that is, between about 200 Hz and about 2 KHz), the output signal remains substantially in phase. Fig. 7B illustrates the frequency response conversion function 727 and phase conversion function 725 'for -b / -a, which are the conversion functions of the difference channel (a) and the first input channel (X2) with a gain of + 12 dB. In FIG. 7B, as shown in FIG. 7A, the frequency response conversion function 727 has a fairly flat gain in the first region 720 of the fundamental frequency (up to about 200 Hz in this example), and a gain in the second region 721 of the intermediate frequency. Decrease (in this example, -18- this paper size applies to China National Standard (CNS) A4 specifications (21 × 297 mm)

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576121 A7 B7 V. Description of the invention (15) From about 200 Hz to about 2 KHz), and the gain in the third region 722 of the high frequency is quite smooth again (in this example, higher than 2 KHz). The phase response transfer function 725 means that in the second region 721 of the intermediate frequency (that is, between about 200 Hz and about 2 KHz), the output signal remains approximately inverted (that is, 180 degrees). As mentioned above, it is better to send the output signals Y1, Y2 to the closely adjacent speaker pairs. The transfer functions A, A and B are examples selected under the condition that the speakers are approximately adjacent. However, it may be profitable from the system 500 of FIG. 5 or other specific embodiments described herein, in which the speaker pairs are not directly connected, but are closely adjacent. FIG. 10 is a sound processing system 1000 according to another embodiment described herein, which can be used in a linear spectral weight filter. In the sound processing system 1000 of FIG. 10, a left audio signal 1011 and a right audio signal 1012 are processed and pushed, and a pair of processed audio signals 1048 and 1049 is sent to a pair of closely spaced speakers 1024 and 1025 (for example, left and right speakers). ). The left and right audio signals 1011 and 1012 are operated by a subtractor 1040 to output a difference signal 1041 representing the difference between the left and right audio signals 1011 and 1012. The difference signal 1041 is fed to a spectral weight filter 1042 having a linear phase characteristic. The frequency response characteristic of the spectral weight filter 1042 is generally determined by a transfer function as shown in Fig. 7A or 7B. Because the spectral weight filter 1042 has a linear phase characteristic, phase equalization and compensation are not required. Therefore, the spectral weight filter 1042 can be directly output to the cross-cancellation circuit 1046, which then mixes the spectral weight signal with the left and right audio channels before feeding the spectral weight signal to the speakers 1024, 1025. To compensate for the delay caused by the spectral weight filter 1042, delay components 1055 and 1056 can be added along the left and right channel paths, respectively. The delay components 1055 and 1056 have better delay characteristics which are equal to the latency of the linear spectral weight filter 1042. The amount of interactive offset provided by sound processing in each specific embodiment is generally -19- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

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Line 576121 A7 B7 V. Description of the invention (Π) A back plate 23 can be used to realize the isolation between two speakers 214 and 215. An inner wall 216 as shown in FIGS. 2A and 2B can be placed between the speakers 214 and 215, thereby generating Two isolated speaker cavities respectively cover the two speakers 214 and 215. The speaker pairs 214, 215 may face directly forward, but in this example, the speakers 214, 215 are facing down, as shown in Figure 2A. When placed in this direction, the slit 219 may be located at the bottom of the speaker box 201, so that the sound of the speakers 214, 215 is emitted toward the listener in the car. Then the speakers 214, 215 effectively occupy only the surface space of the size of the slit 219. In an in-vehicle environment, the front console / dashboard space needs to be cherished because of insufficient space. Therefore, two speakers 214 and 215 can be placed in the front console / dashboard space while minimizing the surface space consumed. This is a great advantage. . The audio system control / display or other conventional operation console equipment (control, LCD or other display, vents, etc.) can be joined or integrated on the front panel 232 of the speaker box 201, so that the surface space of the front panel 232 can be fully utilized. In addition, when placed in this direction, the speakers 214, 215 can be larger (assuming the space of the console is limited); for example: each speaker can be about 4 ”(total 8”), suitable for 8 ”DIN space, but if The front speakers are generally less than 2% '', which is suitable for DIN space. Therefore, placing a larger speaker in the center speaker unit will not reduce the ability of bass reproduction or the visible side (such as door inlay) woofer implementation. The bass information of the left and right channels need to be eliminated. The concept of the downward-direction amplitude effect of the speakers 214 and 215 is illustrated in FIG. 2D, which shows a general speaker 290 facing down to a surface 291. The sound of the speaker 290 is output from the center point along the surface 291 It is emitted in all directions (that is, a complete 360 degrees). Therefore, as shown in FIGS. 2A and 2C, the slit 219 is preferably located at the bottom of the speaker box 201, so that the sound of the speakers 214 and 215 is emitted toward the listener in the car. Speaker 214 -21-This paper size applies to China National Standard (CNS) A4 (210X 297 mm)

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Line V. Description of the invention (18, 215 is equipped with an insulation layer 212 (such as foam material) on the periphery, such as. ', It can be located in the speaker box 201 so that the sound is not raised. °] == 背板 231 (If any) reflection. In the resulting speaker box configuration, the sound emitted by 'from ^ 214, 215 is clearly projected to the listener in the car through the slit 219. In another specific embodiment, the speakers 214, 215 may be upward and It is not downward, and the slit 2i9 is located above the speaker box 201. To achieve a similar effect, i.e., speakers 214, 215 can be placed on the side if necessary, facing each other or facing away from the slit 219. For the slits (one for each speaker 2 and 4 and 215), the direction is vertical rather than horizontal. In this specific embodiment, the speaker box may be taller but more somewhat: under certain circumstances, Figure 2A The high frequency (such as more than 2 KHz) part of the speaker box with f.2C may be lost or reduced. Therefore, place one or more additional speakers 217 of small size in the "flare," above the speakers 214, 215, above In the front panel 232 of the loudspeaker box 201, there is an advantage that higher frequencies can be transmitted. However, the speaker box 201 shown in FIGS. 2A-2C has some advantages of being placed in a standard DIN space in the car. It should be understood whether the closely spaced speakers 丨 4 and 丨 5 are placed in the speaker box 201, which can also be Located in other areas of the car, such as the front dashboard, over the back of the back seat, or in the center console or in the island between the front seat or the front and rear seats. The closely spaced speakers 114, 115 are located on or near the center axis of the car The sound quality is limited to two sides in the car. The size of the center speakers (such as speakers 114 and 115 in Figure 1) is limited. However, the smaller speakers have a loss at low frequencies. To compensate The damage to the low-frequency part of the small central speaker can be placed in an appropriate position, such as a speaker, 124, 125, such as built in the car door. The left and right audio channels fed to the left and right low-frequency audio section can be used. Processing, so that the medium / high frequency attenuation and range-22 · This paper is suitable for a country's standard (CNS) A4 specification (21G x -------- 576121 A7 --_________ B7 V. Description of the invention (θ ) ^ Lift bass audio section. Provided via door speaker The bass frequency will not be detrimental to the middle / high-frequency stereo sound provided by the center speaker pair. This is generally not known as low frequencies below 100 Hz. In addition, if you add a comment, you can add it once in the appropriate place in the car Bass amplifier, and then strengthen the low-frequency bass audio section. For example, this bass amplifier can be located in the rear console above the rear, or in any other appropriate position. In some cases, passengers in the rear seat area of the car may The actual sound quality is better than the front passenger. This is because it has a stereo source (that is, the center front speaker pair). The car is back. Various modifications can be made to make the front passenger sound quality even better. Similar, closely spaced speakers located on other consoles or areas are placed behind the car, such as on or in a rear rack. The same signal used to feed the front f close phase speaker pair can be fed to the rear close phase speaker pair. If necessary, the speaker box 201 containing the closely spaced speaker pair can be placed behind the x-pass tool, and the rear speaker is covered, as shown in Figure 2A-2C. FIG. 9A is a schematic top view of a car 900 for explaining an example of the position of the closely spaced speaker pair 905 (for example, in the front console or the front dashboard) in the front section of the car 900, with door-mounted speakers 907, 908 added,俾 Provides such as additional bass or low frequency audio section. Figure 9B illustrates a similar example from the figure, but with a pair of closely spaced speakers 93o (located in the speaker box or not) behind the car 92o. FIG. 9C illustrates an example of speaker placement in a large vehicle such as a large limousine, which is isolated from driving and passengers. In the driving and passenger compartment 941, its layout is similar to that of FIG. Console, instrument, or the like), a pair of closely spaced speakers 945, and a pair of left and right speakers 947, 948 inlaid on the door. The layout in passenger compartment 942 is similar to Figure 9B, -23- 576121

There are two pairs of closely spaced speakers 960 "in the front and rear areas of the passenger compartment 942, and a pair of left and right door inlaid speakers 957, 958. Of course, in any of these examples, it is possible to limit space in the car, cost, etc. Under consideration, add any number of speakers and audio components according to individual needs and preferences. In some applications, you want to have ring-field sound or other multi-sound remote functions in the car system, and the tightly-spaced speaker configuration previously described here For example: A box-type car with DVD system or other large vehicles that can display digital audiovisual media to passengers in the car, with sound played by the car audio system. In other situations, if you want to have extreme left and right sound, you can There are left and right ring field channels on the recording medium, or extreme and deliberate asymmetry only in the relative volume of the left and right channels. An example block diagram of a car sound system 1100 is illustrated in FIG. Sound, and closely spaced center speaker pair m4, 1115. The operation of the system lio shown here is mostly similar to that in Figure 1 The central speaker has the same sound system 100 related to 1114 and 1115, which can generate the illusion of a wider stereoscopic field image for passengers in the car. In addition, the sound system 丨 100 explains the left and right audio signals 1102 and 1103 are fed to the left and right door mosaic Speakers 丨 丨 24, 1125, which can be fed through low-pass filters 1181 and 1182, respectively, to enhance the bass tone. In order to produce extreme left / right sound, it is not easy for the closely spaced speakers 1 ^, 1115, left and right audio sound Part of the gap between channels 1102 and 1103 (indicated by the gain factor k) is mixed by the signal fed to the left and right door mosaic speakers 1124 and 1125. However, as the gap between the left and right audio channels 1102 and 1103 increases , The signal fed to the left and right channels (depending on which channel is larger) will also increase (linear or non-linear depending on preferences). The gap between the left and right audio channels 1102 and 1103 is large -24- This paper scale applies to China Standard (CNS) A4 size (210 X 297 mm) Staple

Line 576121 A7 B7 V. Description of the invention (21) refers to the extremely left or right sound. Among them, in the system 1100 of FIG. 11, the left and right door mosaic speakers 1124 and 1125 can be successfully reproduced. Another specific embodiment is a ring field or multi-channel sound system 800 that can be used by a vehicle, as shown in the block type of FIG. 8. As shown there, the sound system 800 may include an audio signal source 805, which is the source of the left and right audio channels 802, 803, and is then fed to a sound processor 808 having functions similar to the sound processor 108 shown in FIG. Or various other specific embodiments of the sound processor related to the closely spaced left / right center speakers described herein. In this example, the left and right audio channels 802, 803 may include left and right audio signals before the ring field sound formatting medium. The central audio signal of the surround sound format medium can be mixed with the signals 832, 833 and fed to the close-spaced speakers 814, 815, or to an additional central speaker 817 (for example, if it has a tweeter). Closely spaced speakers 814, 815 and additional speakers 817 can be embedded in or configured in the speaker box type and configuration as shown in Figures 2A-2C. The ring field left and ring field right audio channels 871 and 872 can be fed to the ring field left and right speakers 824 and 825 (can be dipole or monopole). Surround speakers left and right speakers 824, 825—general security can be used to provide ambient sound. When the left and right audio channels 871 and 872 are mono, the adjustable isolation known by those skilled in the art can be used to avoid signal cancellation or similar sound deterioration. The left and right speakers 834, 835 can be like door mosaic speakers, and can directly feed left and right audio channels 802, 803, or can only feed bass / low-frequency tones, and can be mixed with the extreme right or left sound parts, such as the sound previously shown in Figure 11 System related narrative. In addition, the sound system 800 of FIG. 8 may be further disposed at the rear of the vehicle, and a pair of closely spaced speaker pairs (not shown) may be added. If the audio product is 7.1 ring field or similar -25- This paper size is bound to Chinese National Standard (CNS) A4 (210 X 297 mm) binding

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The range of sound quality improvement stability is wider than experience, such as no loudspeaker between comparative sound processing. As a result, audio products (such as soundtracks) have the best or improved sound effects in a wider sound field, and can improve sound quality even when the listener is not in the center of the speaker configuration. Therefore, for example, the home theater surround sound system can provide more listeners with high-quality sound. They do not need to be in the center of the speaker configuration to enjoy the playback of special audio products. Incumbent-the foregoing specific implementation, in the transmission of audio products from each audio source signal to each speaker or other system or system components, are estimated to include any essential audio content, such as virtual audio creation (such as DVDs or other digital recording media), audio tracks, or any other source or content with audio. Audio products such as, cassettes, CDs, CD-ROMs can be read from the recording medium, or they can be received wirelessly and exist in any available format, not to mention broadcast or point-to-point transmission. The audio product preferably has at least left and right channel information (whether decoded or not), but can already include additional channels, such as ring-field sound or other multi-channel format codes, such as Dolby_AC3, DTS, DVD-Audio, etc. Audio products may also include digital files that are temporarily or permanently stored in a format for audio playback, such as MP3 format or digital multimedia format. Each of the implementation examples described herein can be implemented using digital or analog techniques and bit combinations. The “circuits” described herein include analog components, discrete digital components, microprocessor-based or digital signal processing (DSP), or any combination thereof. The present invention is not specifically implemented in terms of the sound processing performed. The special method in the example operation is limited. Although some better or exemplary filter characteristics and conversion functions have been used here. 27- This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm).

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576,121 V. described invention (to provide examples, will be aware of any system, one thousand Bu ^ _ special visual characteristics and special her Ding, type speaker, a speaker relative spacing, v special master hand, brother clothing and other such factors condition Therefore, any of the characteristics of 1 n 疋 < are mentioned here for explanation, but not limited to it. In addition, specific departments, T 疋 han, such as spectrum weight filtering related to specific embodiments The devices are all variable external tones, and they can be adjusted according to individual sound preferences. ° Although the specific system components described are "connected to each other," it should be understood that such terms include any type of data communication or transfer # , Whether the components are interconnected or intervening components are present or not. It will be understood that additional circuits or system components may be added without departing from the teachings shown here. In any of the specific embodiments described herein, The speakers used in the car sound system can basically be passive or active (that is, with built-in or on-board amplification). Each audio channel of each speaker or speaker pair can be individually amplified Level shift, lift or appropriate adjustment. Although the preferred embodiments of the present invention have been described herein, many changes can be made without departing from the concept and scope of the present invention. After reviewing this specification and drawings, Those skilled in the art can further enhance the understanding of such changes. Therefore, the present invention is not limited by the spirit and scope of any accompanying patent application scope. -28- This paper standard applies to Chinese national standards (CNS) A4 specification (21〇X 297 male)

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Claims (1)

576121: > Patent Application No. 091102644 Yizhong X Application Patent Scope Replacement (December 1992) g88 6. Patent Application Scope 1. A car sound system, which includes: a left speaker and a closely adjacent speaker A right speaker; a left channel audio signal; a right channel audio signal; and a bone processor for receiving the left channel audio signal and the right audio signal as inputs, the sound processor is configured to: Before the left channel bone frequency signal and the right channel frequency signal are sent to the left speaker and the M right speaker, respectively, the left channel frequency signal and the right sound are weighted with a spectrally weighted stereo difference signal. The audio signals are mutually canceled. 2. The automobile sound system according to item i of the patent application, wherein the left speaker and the right speaker are located at or near the center axis of the vehicle. 3. The automobile sound system according to the scope of the patent application, wherein the left speaker and the right speaker are adjacent to each other. 4. The automobile sound system of item 3 in the scope of patent application, wherein the left speaker and the right speaker are fixed in a common housing. 5. The automotive sound system according to item 4 of the patent application, wherein the left speaker and the right speaker are directed downward or upward toward the flat surface of the common cover, and wherein the common cover defines at least one narrow edge near the edge of the flat surface. Sew, so that the sound from the left speaker and the right speaker is not hindered by the inside of the common cover. 6. The automotive sound system as claimed in item 5 of the patent application, further comprising an insulating material existing in the common cover and opposite to the position of the slit, the insulating material substantially conforming to the periphery of the left speaker and the right speaker. 7 · If the car sound system in the fourth item of the scope of patent application, it also includes one or more -1 " This paper size is suitable] ϋΤϊ «豕 标 半 (CNS) M specifications (210X297 public love)-: --- 576121 '. A ^, The patent application surrounds the A8 B8 C8 D8 additional speakers, which are fixed in or on the common housing, and the one or more additional speakers are oriented toward the interior of the vehicle. 8. The car sound system as claimed in item 1 of the patent application, which includes a pair of left and right speakers installed on the door. 9. The automobile sound system according to item 8 of the patent application scope, wherein the left and right speakers of the pair of doors receive the low-pass filtered left-channel audio signal and the right-channel audio signal, respectively. 10. The car sound system of item 8 in the scope of the patent #, wherein the left speaker installed on the door receives at least a part of the difference between the left channel audio signal and the right channel audio signal ', and the right speaker is installed on the right side of the door. The speaker receives at least part of the difference between the left channel b-band h number and the right channel audio signal. 11. For example, the automobile sound system of the scope of patent application, wherein the sound processor is configured to generate a difference signal representing the difference between the left channel audio signal and the right channel audio signal, and apply a spectral weight to the difference signal. , Thereby generating a spectrum weight signal, and using the spectrum weight signal to interactively cancel the left channel audio signal and the right channel audio signal, thereby generating a first speaker signal to the left speaker and a first speaker signal to the right speaker Two speaker signals. 12. A method suitable for sound reproduction of a parent tool, the method includes the following steps: positioning in a pair of speakers closely adjacent to each other; receiving a left channel audio signal and a right channel audio signal from an audio source, The left-channel audio signal and the right-channel audio signal are essentially stereo; and -2-This paper size applies to China National Standard (CNS) Α4 specification (210X 297 male diamond) Hold η 576121 A8 B8 C8 D8 VI. Patent application Fan Park Interactively process the left channel audio signal and the right channel audio signal to generate the effect of widening the sound image produced by the pair of speakers. 13. The method according to item 12 of the patent application, wherein the step of interactively processing the left channel audio signal and the right channel audio signal includes obtaining a difference between the left vocal audio signal and the right channel audio signal. The difference signal, the spectrum weight is applied to the difference signal, and before the left channel audio signal and the right channel audio signal are applied to the pair of closely adjacent speakers, the left channel audio signal and the right channel audio are interactively cancelled Signal's spectral weight difference signal. ^ -3- This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 576121 Patent Application No. 0911〇2644 Chinese Schematic Replacement Page (November 1992) -300 Left audio signal j ;; 312 ^ 310- (〇) Sound processor (5), 324, 325 Figure 3 Right audio signal -500 555 Y1 Y2 5 -34- 576121 Uv l; I Patent Application No. 089127087 t— · ....: Chinese Schematic Copy (December 1992) s 1QS , 1624, 1625 -45-