TWI238671B - Sound system and method of sound reproduction - Google Patents

Abstract

A sound reproduction system comprises a left and right speakers located in close proximity, and a sound processor which provides audio signals to the pair of speakers. The sound processor preferably derives a cancellation signal from the difference between the left and right channels. The resulting difference signal is scaled, delayed (if necessary), and spectrally modified before being added to the left channel and, in opposite polarity, to the right channel. The spectral modification to the difference channel preferably takes the form of a low-frequency boost over a specified frequency range, in order to restore the correct timbral balance after the differencing process. Additional phase-compensating all-pass networks may be inserted in the difference channel to correct for any extra phase shift contributed by the spectral modifying circuit. The technique may be used in a surround sound system.

Description

1238671 A7 B7 V. Description of the Invention (! Related Applications This application claims priority to US Provisional Application No. 60 / 267,952 filed on February 9, 2001, and the entire text is hereby incorporated by reference 0 Background of the Invention 1) Field of the Invention The field of the invention relates to sound reproduction, and in particular to the configuration of loudspeakers used in sound systems and related sound processing. 2) Background It is very challenging to get the best sound quality in the ring sound or multi-channel sound system. The difficulty of achieving the best sound quality in such systems is due to the variety of different ring-field sounds, multi-channel sound formats, and loudspeaker configurations, so that a particular system may have one or two sound formats Relevant and highly satisfying sound effects, but sub-optimal sound effects for other audio formats. Therefore, as far as consumers are concerned, they may face, for example, the use of a single sound system to play sounds in different formats and different sounds. Some of them are even poor or damaged. Although users can improve the sound quality by adjusting the position or contrast of the loudspeaker, such technologies still involve a lot of effort and inconvenience. 'It is not easy to reproduce consistently, and may only be enough to benefit one of the relatively small listening areas or Some listeners. Existing ring-field sound record formats include formats such as 5.1, 6.1, and 7.1. The 5.1 ring field format includes a five-channel compressed data stream. It is generally designed as left, center, right, ring field left, and ring field right. It is named after the position of the loudspeaker for the channel information. A low-frequency effect channel is a combination of five other channels, and this paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm) 1238671 A7 B7 V. Description of the invention (2) Yes Supplied to a primary bass amplifier. The 61 ring field format contains the same five channels as the 51 ring field format, but adds a ring field back channel and feeds it to one or more back speakers in the ring field sound system. The 71 ring field format is similar to the 6.1 ring field format, but it has two ring field back channels (ring field back left and ring field back right) instead of having a single back channel, with a total of seven channels. Therefore, the 51 ring field format has two ring field channels (ring fields left and right), the 61 ring field format has three ring field channels (ring fields left, right, and back), and the 71 ring field format has four ring field channels ( Around the field and around the back). The general basic configuration of the ring field system loudspeaker includes six to eight loudspeakers placed in a suitable position, which depends on the type of ring field format to be played. A 6-amplifier ring field system generally includes left, right and center loudspeakers (left and right loudspeakers have a large spacing), a primary bass loudspeaker, and ring field left and right loudspeakers (basically can be monopole or even Pole) ^ 7 _ Loudspeaker ring field system generally contains the same loudspeaker configuration as the 6-speaker ring field system, only one back ring field speaker is added. An 8-speaker ring field system generally contains the same speaker configuration as a 6-speaker ring field system, with the addition of a back left ring field loudspeaker and a back right ring field loudspeaker. ^ The listener's pleasure in the ring sound system is affected by several factors, including the relative physical position of the listener and each loudspeaker, and the special format of the audio ^ track played by the system. For example: · When playing a 5.1 ring format audio track in an 8-speaker (71) ring field system, an exception may occur. An example of this is as follows: if the left and right field audio signals are 4 mono, the left and right ring field effect disappears, and it is replaced by a single central "ghost" on the back, replaced by sound and image. Another phenomenon is as the listener It is located in the center of the ring field left and ring field right loudspeakers, then it can be 1238671 V. Invention description (A7 B7

This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm). You can feel the volume of the left or right sound (if mono) in the ring field is high. This is mainly because the sound waves Caused by the additive effect (known as the 'ascension,' effect). If you consider the sound swing from side to side (for example, from left to right), the volume may increase with the realization of the left / right contrast, and then decrease with the continuous swing of the sound, even if the sound output level is maintained The same is true, and it is also due to the "ascension, effect. The sound quality also appears to be" unstable. If the listener moves from the central position, the sound may look from one side to the other. " beat". The above effects in the 5.1 ring-field sound system can be mitigated by adjusting isolation from the left and right loudspeakers of the ring field. It is estimated from the two signals that are generally isolated when the left and right signals of the ring field are mono.俾 Provide improved sealing ring field effect. When playing a 61-ring format audio track in an 8-speaker (7.1) ring-field system, it may face anomalies. Because the two rear ring field loudspeakers (left and right) each feed the same mono signal (that is, the same ring field back signal), when the listener is almost equidistant from the loudspeaker, a centrally located " Ghost, image. Side effects of this configuration have been reported to include "distortion," (for example, the sound may sound "unnatural") associated with ghost images, when the listener leaves the center, which is caused by the instability of the sound image. "Desserts, and comb-like filtering effects (in other words, 'zero noise may occur due to the sound wave offset effect). In addition to ring-field systems, there are also various multi-channel recording and playback systems. Some common multi-channel Examples of sound systems are D0% ac_3, DTS and DVD_

Audio, which has a unique digital decoding format. Unlike movie sound effects, for most multi-channel audio formats, there is generally no speaker type (eg __-6-

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1238671 A7 B7 V. Description of the invention (4) Single standard such as full-frequency, satellite and subwoofer amplifiers, dipole, monopole or amplifier layout. Therefore, any listener who wants to hear multi-channel soundtracks and / or any ring-field format (5.1, 6.1, and 7.1) must accept the layout of the amplifier optimized for a particular audio format and Compromise the other parts, or reconnect the amplifiers to begin with an audio format suitable for a particular soundtrack. In the environment of ring-field sound, other sound systems also face similar challenges, such as obtaining a sensational "sweetness" with an appropriate breadth, and maximizing the stability of a stereo shirt. In most traditional sound systems, It is customary to place the left and right loudspeakers away from each other. Under this theory, the human ear is better able to perceive the brilliance of the sound theme. However, in many left / right loudspeaker configurations, the sound at the off-axis listening position may be secondary. The sound quality at a certain off-axis listening position may not only be affected by the left and right volume difference caused by the difference between the left and right loudspeaker distances, but also related to the slight time difference in the arrival of auditory information to the listener. Accordingly, providing one or more can be overcome The sound system of the aforementioned problems or shortcomings has its function. SUMMARY OF THE INVENTION The present invention generally refers to improvements in sound reproduction systems and methods, including loudspeaker configuration and / or cloth f, and related corpse sound processing. The stability of the sound and image produced by the left and right source signals. 1. In the aspect, the sound reproduction system includes a pair of closely adjacent loudspeakers (left and right), and a pair of loudspeakers is provided. The sound processor of the audio signal. The "broadcast" sound image produced by two closely adjacent loudspeakers. The offset signal is obtained by freely estimating the difference between the left and right channels. The resulting differential signal is proportionally adjusted before it is added to the left-paper-size standard (CNS) A4 specification (210X297 public director) 1238671 A7 _____B7 V. Description of the invention (5) The right channel with the opposite polarity to the channel is adjusted by proportion , Delay (if required), and spectrum corrected. This pair of differential channel's spectrum correction is better for low-frequency boost within a specific frequency range. It is beneficial to restore the correct tone contrast after differential processing (when the low-frequency signals of each channel are similar, it will cause bass loss). . Can add phase compensation all-pass network in the differential channel, 修正 make corrections to the extra phase offset often caused by the lowest phase offset spectrum correction circuit, so that the correct phase relationship between the offset signal and the direct signal can be as desired The frequency range remains the same. Alternatively, a linear phase network can be used to provide spectrum correction for the differential channels, in which an appropriate, approximately identical frequency can be applied to independently delay the left and right channels to provide compensation. Various types of loudspeaker configurations and specific embodiments of sound processing described herein can be used in connection with the %% sound system 'to improve sound reproduction. A sound reproduction system used in a ring field sound stereo sound system may include a set of loudspeakers (such as front, left, center, ring field left and ring field right), including a pair of closely adjacent ring field back amplifiers And a sound processor. The sound processor receives the left and right ring field channel signals (side or rear ring field signals) and generates a differential signal from there. The resulting differential signal can be processed as described above, that is, before adding the left channel to the right channel with the opposite polarity, scaled, delayed (if required), and spectrally corrected. Can add the phase compensation all-pass network in the differential channel as described above, to correct the extra phase offset caused by the usually lowest phase offset spectrum correction circuit, so that the correct relationship between the offset signal and the direct signal It is maintained in the desired frequency range. Further specific embodiments, changes and enhancements are also described here. …. _-8-This paper size is in accordance with Chinese National Standard (CNS) A4 (210X 297 mm) 1238671 A7 B7 V. Description of the invention (6 Schematic description Figure 5: Sound track playback in a 5: 1 ring field system Device diagram. Figure 2 Series 7.1 ring field sound system 51 ring field format sound track playback device diagram. Figure 3 Series 7.1 ring field sound system 61 ring field format sound track playback device diagram. Figure 4 System 7.1 ring field sound The concept of "sweet desserts" in the organization of the 61-round field format sound track playback device of the system. Figure 5 is a moving image of a ghost image related to the movement of the listener. Figure 6 is a preferred embodiment according to this description. Figure 7 shows the configuration of the loudspeaker of the ring field sound system. Figure 7 is a diagram of the 61 ring field format playback device in the direction of rotation in the ring field sound system shown in Figure 6. Figure 8 is one or more of the described here A block diagram of a sound processing system in a specific embodiment, for example, can be used in conjunction with the loudspeaker configuration shown in Figure 6. Figure 9-1 is a detailed illustration of a sound processing system that can be used in conjunction with the system shown in Figure 6 Figure 9-2 is a diagram of the sound processing system according to the layout shown in Figure 9-1. An example of the possible transfer function characteristics of a block. Figure 10 is a diagram of a sound processing system to illustrate a representative transfer function. Figure 11 is a diagram of a sound system according to the general principles of the system shown in Figures 8 and 9, applicable to the ring field Sound system organization. Figure 12 is a conceptual diagram for explaining the processing / operation of a 5.1 ring field format playback device in a ring field sound system organization, such as shown in Figure 6 or Figure 1. Figures 13 and 14 are used to explain Examples of frequency response and phase conversion functions for sound processing systems with special spectral weights and other characteristics.

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^^ Zhang scale is suitable for the national standard of the country (where) ^ Specifications (21 ()) < 297 public directors) -9 '-------- 1238671 A7 ______ B7 V. Description of the invention (7) Figure 15- 1. 15-2 and 15-3 are examples of gain and / or phase conversion functions of the sound processing system according to FIG. 9-2. Figure 16 is a diagram of a sound processor using a linear spectral weighting filter. Detailed Description of the Preferred Embodiments According to the specific embodiments described herein, in one aspect, a preferred sound reproduction system includes a pair of closely adjacent loudspeakers, and a method of providing a loudspeaker to an acoustic signal. Sound processor. The sound processor is based on the use of cross-offset technology to "spread" the sound and image produced by two closely adjacent loudspeakers. The offset signal is obtained by freely estimating the difference between the left and right channels. The resulting differential signal is added to the left. In front of the right channel with opposite polarity, the channel is scaled, delayed (if necessary), and spectrum corrected to expand the sensing area and the stability of the stereo sound and image. The sound processing technology will be described later. Details. The comparison and comparison here with the conventional ring-field / multi-channel sound system reveals some advantages of the specific embodiments. For example, the ring-field decoding sound track playback device in 51 ring-field system 100 in Figure i. As shown in Figure 丨, the 51 ring field system 100 includes a left-handed loudspeaker 104, a front right-handed loudspeaker 105, a center loudspeaker, a subwoofer 109, and a ring-field left loudspeaker. 114 and a ring field 'right loudspeaker 115. In the example shown in Figure 1, the left and right ring field loudspeakers 114, 115 are dipole loudspeakers, which spread the sound in multiple directions (generally opposite directions) and borrow This provides improved ambient sound. Typical ring field left The loudspeakers 114 and 15 are located in opposite positions in the room (or other audiovisual space), and are relatively far away, and their positions are slightly behind the desired listening position. 5.1 Loudspeaker 10 in the ring field system 100 , 104, 105, 10, U4, and ⑴ The general configuration is used to provide the listener 107 near the center of the loudspeaker configuration. 107 -----------10- This paper standard applies to China National Standard (CNS) A4 specifications (210X297 male |) _--------- 1238671 A7 B7 V. Description of the invention (8) Jiashengjin. But the 5.1 ring field system is lacking for the listener. The effective direction of the side and the rear is divided into I. Therefore, the 6.1 or 7.1 ring field system has a rear loudspeaker component, which can provide excellent sound and sound effects in a full organization. As described in the previous 6.1 ring field system, after adding a single Ring-field loudspeaker, and 71 ring-field systems are added two rear ring-field amplifiers, which are generally quite far away. Figure 2 is a 7.1 ring-field sound system 200-5. As shown in FIG. 2, the 7.1 ring-field sound system 200 includes front and left loudspeakers 204 and 205, a central loudspeaker 202, and a primary bass loudspeaker 2. 9. A ring field left loudspeaker 214, a ring field right loudspeaker 215, a ring field back left loudspeaker 224 and a ring field back right loudspeaker 225. In the special example shown in Figure 2, as shown in Figure 1 'ring The left and right loudspeakers 214 and 215 are naturally dipoles. Typical ring back and left and right loudspeakers 224 and 225 are far away from each other behind the listener 207. When playing in a 7.1 ring field system 200 such as shown in Figure 2 · When the sound track is decoded, the ring field left and right microphones 214 and 215 receive the left and right ring field channel information, and the ring field back left and right microphones 224 and 225 are designed by the user with or without the left and right. Ring field channel information. In any of these cases, abnormalities may occur. For example, if the left and right ring field channels are mono, the left / right ring field effect appears to disappear and is replaced by a single center, phantom, and sound image 230 behind the listener 207. This effect can be mitigated by adjusting the isolation, which is estimated from the approximate isolation signal of a single mono channel, and provides an improved sealing ring field effect. Figure 3 is a diagram of the ring field format playback device of the 7.1 ring field sound system. In FIG. 3, the loudspeaker labeled 3 × χ corresponds to the same loudspeaker labeled 2 × χ in FIG. 2. When playing a 6.1 ring field in the 7.1 ring field system 300 shown in Figure 3

1238671

When performing the vocal performance, the ring field back speakers 324 and 325 are fed the same mono signal (derived from the single ring field back channel in the 6.1 decoding format), which may or may not be The listening position is not equidistant to compensate for the delay. As shown in Fig. 3 ', when the listener is nearly equidistant from the ring back loudspeaker 324'325, the identical mono signal played by the listener generates a central, phantom, and sound image. The reported side effects include distortions related to ghost sound image 330, which can cause the listener to confuse or unnatural sound, when the listener and the two-ring field back loudspeakers 324, 325 (see Figure 5) When the equidistant axis moves from the center to the outside, there are “desserts” caused by inadequate sound and image (see Figure 4), and offsets caused by the “comb filtering” effect of sound waves interfering with each other (that is, the point of zero silence) ) Caused a certain frequency range suppression. As a result, when the 6.1 ring field format sound track is played in the 7.1 ring field system 300, its sound quality will be quite significant and special for a listener who is not in the best listening position. As mentioned in the previous background section, replays of other multi-channel format soundtracks (such as Dolby AC-3, DTS, or DVD-Audio) may also experience similar problems, depending on the left / right and back loop field speakers. The signal depends on the nature of the signal. Figure 6 is a loudspeaker configuration diagram of the ring field sound system 600 in a preferred embodiment described herein. The ring field sound system 600 of Figure 6 is shown in Figures 2 and 3 respectively. The display system 200 is similar to 300, including left and right loudspeakers 604, 605, A loudspeaker 602, a subwoofer 609, a ring field left amplifier 614 and a ring field right loudspeaker 615. The sound system 600 further includes a ring field back left loudspeaker 624 and a ring field back right loudspeaker 625 It is better to be close to each other, even in the same loudspeaker packet. The ring field back and left and right loudspeakers 624, 625 are all the same, basically dipole or unipolar, but as shown in Figure 6 For single -12- This paper scale applies Chinese National Standard (CNS) A4 specification (210X 297 mm) 1238671

. Figure 6 ψ · ^ Virtual, so the 7F sound and bone system 6 ⑻ loudspeaker configuration, with the better sound %%, such as when playing in any ring field sound or multi-channel format recording: when the track is loud, both can Provides improved sound quality. When the Tiantu 6 Hot Sound System 600 plays the sound track recorded in the 71 ring field format, the left, seven fire,, right, center, and ring field left / right channel audio signals are fed to the appropriate, ° 'as Generally, in the typical 7.1 ring field loudspeaker configuration, the% left and right loudspeakers 624, 625 are used to receive the sound signal of the right sound of the clothes field and the left channel sound effect of the ring field after sound processing. Preferably, it will be detailed later. ,change. When the sound system 600 shown in FIG. 6 is played and recorded in the 6.1 ring field format, the left, right, center, and ring field left / right channel audio signals are again fed to the appropriate amplifiers. This is typical of a 71-ring field loudspeaker configuration. It is generally assumed that the ring field Εχ (S_ndE々) has been selected for playback (for example, a ring field Εχ flag appears), then the left and right loudspeakers 624, 625 of the ring field receive and directly respond to the sound signal of the channel behind the ring field. The mono signals that are extremely stable in the sound field (that is, the sound signals of the rear field of the ring field) are the central rear sound images generated by the closely adjacent ring fields and the left and right loudspeakers 624 and 625, which are widely dispersed Compared with the left and right loudspeakers of the ring field, the sound produced by the ring field loudspeaker after such a distance is significantly, distorted, or unnaturally significantly reduced. In some examples, such as 6.1 ring field sound When the track system is in matrix decoding form, or when no SurroundEX processing is used, it may be perceived as a slightly different playback form. In this situation, the sound system can effectively process 51 sound tracks, and can surround the left and right channels. Acoustic signal is transmitted to the ring field

1238671 A7 _____B7____ 5. Description of the invention (U) devices 624, 625, which can be mixed with at least part of the mono information (such as sound track matrix decoding). According to one of the preferred sound systems disclosed here, the left and right loudspeakers 624, 625 of the ring field receive and directly respond to the sound signals of the channel behind the ring field. If such information exists, as described further herein, the left / right channel audio signals of the ring field are processed after appropriate sound processing. FIG. 7 is a diagram of a 6.1 ring field decoding track playing device in the sound system 600 shown in FIG. As shown in FIG. 7, the left and right loudspeakers 624 and 625 project a wide-area mono sound image. The sound signals of the left and right channels of the ring field are fed to the left and right speakers 614 and 615 of the ring field, and after the sound processing to be described later, they are fed to the left and right speakers 624 and 625 of the ring field. When the sound track recorded in the 5.1 ring field format is played by the sound system 600 of FIG. 6, the sound signals of each of the left, right, and center channels are fed to the appropriate amplifiers, as is generally the case in the typical 7.1 ring field amplification. Device configuration. The preferred operations related to the ring field left and right loudspeakers 614, 615 and ring field back left and right loudspeakers 624, 625 are dependent on the left / right channel sound signals of the ring field. Basically, when the left / right channel sound signal of the ring field is mono, the sound system 600 uses the offset adjustment to provide the offset signal to the ring field amplifiers 614, 615, and provides a direct feed to the ring The back and right loudspeakers 624 and 625 on the back of the field produce a good center; the image is better. But basically when the ring field left / right channel sound signal is stereo, the ring field left / right channel sound signal is directly fed to the ring field amplifiers 614, 615 'without offset, and as further here Describe, after proper voice processing, 'feed to ring field back left and right loudspeakers 624, 625. The surround left / right channel audio signals are processed to significantly increase the size of the post-sound image and its stability in the off-axis listening position is improved. Rings on both sides -14- This paper size applies to Chinese National Standard (CNS) A4 specifications (210 X 297 mm) --- 1238671 A7 B7 V. Description of the invention (12) Field loudspeakers 614, 615 and two ring fields The back loudspeakers 624, 625 are appropriately allocated and added together to produce a nearly continuous second half sound field, thereby improving a wide-area listener's perceived sound. FIG. 12 is a conceptual diagram for explaining a 5.1 ring field format sound track playback device in the sound system 600 of FIG. 6. As shown in Figure 12, when the left and right channel audio signals 1211 and 1212 are mono, the adjustment cancellation process is started (listed in blocks 1271 and 1272), and when it is basically stereo, Then adjust the sound processing for the rear ring field loudspeakers 1224, 1225 (listed in block 1201). Broadly speaking, the techniques described herein can greatly improve the sound of a stereo signal connected to a loudspeaker configuration comprising two closely adjacent loudspeakers. Whenever stereo signals from any decoding design (such as ring field sound or multi-channel sound track) or any audio product or source are directly fed to the appropriate left and right loudspeakers (such as left and right ring field loudspeakers), and then pass through After proper sound processing, as further described herein, is fed to closely adjacent loudspeaker pairs (such as ring field back loudspeakers). The pair of closely adjacent loudspeakers can thereby generate a sound image with improved wide area, stability, and quality, expanding the optimal listening area and providing better comfort for the listener. Details regarding better sound processing of closely adjacent loudspeakers (such as ring field loudspeakers 624, 625 after FIG. 6) will be described. FIG. 8 is a block diagram of a sound processing system 800 according to the specific embodiment described herein. For example, it can be used in conjunction with the loudspeaker configuration shown in FIG. 6, or in a broad sense, can be used with any multi-audio channel. Provide a sound system with stereo source signals. As shown in FIG. 8, the left audio signal 811 and the right audio signal 812 are provided to the sound processor 810, and then to a pair of closely adjacent loudspeakers 824, 825. You can also send the left audio letter -15- this paper size is applicable to Chinese National Standard (CNS) A4 specification (210 X 297 mm) 1238671 A7 B7 V. Description of the invention (No. 13 811 and right audio signal 812 to the left and right sides (circle Field or non-circle field), not shown in Figure 8. In a preferred embodiment, the sound processor 810 uses cross-off and offset techniques to propagate, by two closely adjacent loudspeakers 824, The sound and image produced by 825 'is in which the offset signal is estimated from the difference between the left and right audio signals 81 丨 and 812. Then the difference signal obtained is added to the left channel and the right channel of the opposite polarity, and its proportion is adjusted and delayed. (If necessary) and spectrum correction. This pair of differential channel spectrum correction is better for low frequency finger-ups within a specific frequency range. It is beneficial for differential processing (when the low frequency signals of each channel are similar, it will Lead to a loss of bass), restore the correct tone color contrast. The effect of the sound processor 810 is to expand the sound sensing area and stability of the sound produced by the speakers 324, 325, and even when the speakers 324, 325 are tight Raised before the adjacent, also It has a stereo sound effect. Figure 9-1 is a detailed illustration of the sound processing system 900 (established in accordance with the principles here), which can be used in conjunction with the sound system 600 shown in Figure 6, or widely, in any In a sound system using multiple sound channels to provide a stereo source signal. In the sound processing system 900 of FIG. 9-1, two left sound signals 911 and right sound signals 912 are provided from one sound source, and can be fed to other amplifiers. (Not shown in Figure 9-1). The difference between the left sound signal 911 and the right sound signal 912 is obtained by the subtractor 940, and the difference signal 941 is fed to the spectrum weight filter 942, where the difference signal is 941 applies spectrum weights to 21 states). The characteristics of the spectral weighting filter 942 can be changed depending on several factors, including the desired auditory effect, the loudspeaker 924, 925 spacing, and the listener's goodness. The weighting filter 942 can be output to the phase equalizer 945 to compensate the frequency. = > Phase shift (such as non-linearity) caused by the heavy filter 942. ~ Duo

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1238671 A7 B7 V. Description of the invention (14) In FIG. 9-1, the phase equalizer 945 is output to the cross-offset circuit 947. The cross-offset circuit 947 also receives the left acoustic signal 911 and the right acoustic signal 912, which are adjusted by the phase compensation circuits 955 and 956, respectively. The phase compensation circuits 955 and 956 can be like all-pass filters. The phase equalizer 945 performs a phase offset (phase distortion caused by merging the spectral weight filter 924) in a complementary manner, and offsets individual input signals (ie, left and right). The acoustic signals 911, 912) are preferably such that the phase characteristics of the center channel are approximately 180 degrees opposite to the phase characteristics of the left and right channels of the desired frequency band range. The cross-offset circuit 947 may include a pair of summing circuits (one for each channel), and then after adjusting to the proper polarity, the differential signal of the spectrum weight and phase balance is mixed with the phase-compensated left audio signal 911 and right audio Signal 912. The amplitude of the sound level induced by the loudspeaker pairs 924 and 925 can be adjusted by the gain change of the differential signal path, and / or the shape of the spectral weight filter 942 can be changed. Fig. 9-2 is a diagram of a sound processing system 900 'according to the layout principle shown in Fig. 9-1, further showing an example of the possible transfer function characteristics for a certain processing block. As shown in FIG. 9-1, in the sound processing system 900 ', a left sound signal 911' and a right sound signal 912 'are provided from a sound source (not shown), and representative left sound signals 911' and right sound signals are obtained. 912 'difference difference signal 94Γ. The differential signal 941 'is fed to the spectrum weight filter 942'. In this example, the spectrum weight of the differential signal 941 'is given, and its characteristic diagram is shown in Figure 9-2. The details of the transfer function characteristics (gain and phase) of the spectral weight filter 942 ’in the example are shown in Figure 15-1. As described above, the spectral weight filter 942 'is a first-stage filter with a low-frequency gain of OdB, and the cut-off frequencies are about 200 Hz and 2000 Hz. If necessary, the gain and spectrum weight filter 942 'applied by the gain / amplifier block 946' can be used. _-17- _ This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 1238671 A7 _______ B7 V. Description of the invention (15) Integrated into-, or apply downward gain, as shown in Figure 9 under any of the above conditions, 'cut-off frequency, gain amount, slope, and other transfer function characteristics may be based on the desired application and / or Adjustment of overall system characteristics. There is a phase equalizer state in the central processing channel, and a phase compensation circuit is added to the right and left channels. The state and the state ensure that the phase between the center channel and the right and left channels is maintained. relationship. As shown in Figure 15-1 and the more detailed Figure 15-1, the spectrum weight filter 舛 2 in this example causes phase distortion in the range of at least 200 Hz to 2000 Hz. The phase equalizer state does not have gain, but it can modify the overall frequency characteristics of the center channel. Class ㈣, phase compensation circuits 955, and 956 are used to modify the phase characteristics of the left and right channels, respectively. In this example, the phase compensation is selected in the desired frequency range (in this example, from 2000 to 2000 Hz) so that the center channel phase characteristic (ie, the spectral weight filter 942) The integrated phase effect with the phase equalizer 945) is almost 180 degrees out of phase with the left and right channel phase characteristics. At the same time, the phase characteristics of the left and right channels remain unchanged, so that in other events, the mono signal played on the left and right channels will have the same phase processing on the two channels (and thus maintain the proper sound characteristics) ). Therefore, the phase compensation circuit of 9%, and 956, is configured to apply the same phase processing to the left and right channels. For the center channel phase equalizer 945 in FIG. 15-2 and the gain and phase conversion functions of the phase compensation circuits 955 'and 956' around the left and right in FIG. 15-3 (in the case that this component is built in an all-pass filter, Its gain is zero) explained in more detail. In these examples, the phase equalizer 945 is built as a second-stage full-pass chirper (F = 125 Hz, Q = 0.12), and the phase compensation circuits 955 and 956 are each built as a second-stage full-pass Pass filter (F = 3200 Hz, Q = 〇.i2). Q value is more than _ _ -18- This paper size applies Chinese National Standard (CNS) A4 specification (210X297 public director) 1238671 A7

1238671 A7 B7 V. Description of the invention (17

In a preferred embodiment, the transfer function -B of processing block 1060 represents a comprehensive conversion function of a spectral weight filter and a phase equalizer of a desired characteristic, such as the differential path shown in the sound processing system 400 of FIG. In a preferred specific embodiment, the conversion functions A and -A of processing blocks 1055 and 1056 also represent the conversion functions of the phase compensation network, respectively, which perform complementary phase offsets and compensate for the phase effects caused by processing block 1060. The polarity is selected in Figure 10 to obtain the appropriate cross offset. In a preferred embodiment, the input signals XI and X2 are the Z-transformation of the left and right audio channel inputs, while Y1 and Y2 are the meters and feeds to closely adjacent pairs of speakers (such as left and right speakers). The left and right channel outputs correspond to the Z-transform. The transfer functions A,-A and B can be represented by z terms, and are determined in part by the sampling frequency F s related to processing in the digital domain. According to a special embodiment, blocks 1055 and 1056 are second-stage all-pass filters with f = 3200 Hz and Q = 0.12. In one example, the following conversions can be made according to a representative example of the sampling frequency F s Function characteristics: For Fs = 48 KHz A⑵ =-0.2578123-0.6780222 Factory 1 + Factory 2; 1-0.6780222,-0.2578123 Factory 2 For Fs = 44.1 KHz male) = -0.2944196-0.633509 ^ + ^) 1 0.633509 Factory 1- 0.2944196Z-2 for Fs = 32 KHz male) =-0.4201395-0.469117 / + ^; 1-0.469117 factory 丨 -0.4201395, 2 -20- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ) 1238671 A7 B7 V. Description of the invention (18 In this particular embodiment, the block 1060 may be a first-stage rack with a gain of 0 dB at low frequencies and a cut-off frequency of 200 Hz and 2 KHz. All-pass filters (125 Hz, Q = 0.12) are connected in series. In an example, the following transfer function characteristics can be present according to a representative example of the sampling frequency F s: For Fs = 48 KHz B (z) = Gx 0.1116288 _0.0857871 Corps 丨 Γ 0.9741583 Factory 1 0.8723543-1.872104 ^ + ^ 2 1 1.872104 Factory ^ 0.8723543 Factory 2 Pair Fs = 44.1KHz 0.8618468 -1.86155 2% plant 2 2 ^ 1.861552 / + 0.8618468z-2 0.814462-1.813915 factory, 1 1 1.813915 factory ^ 0.814462 (2 λ ^ 0.1126427 — 0 · 0845478ζ_1 B (z) = Gx-:-1-0.9719051 ^ to Fs = 32 KHz ^ 0.1173312-0.0788175 factory 1 B (z) = Gx-:-1 — 0.9614863 corpse 1 can also include a gain term in block 1060, or it can be in the same path as a different block or component The gain value can be determined through experiments on a specific application, but the average period is generally optimized in the range of 10-15 dB. For example, in a specific embodiment, the gain term is 12 dB. Figure 1 3 and 1 Figure 4 is an example of the frequency response and phase conversion function of a sound processing system according to Figure 10. It also has special spectral weighting, equalization and phase compensation characteristics. Figure 13 illustrates the frequency response conversion function 1302 and phase for -B / A The transfer function 1305 is a transfer function of a differential channel (-B) and a first input channel (X 1) added with a + 12d B gain. As shown in FIG. 13, the frequency response transfer function 1302 has a relatively smooth gain in the first region 1320 of the fundamental frequency (in this example, up to about 200 Hz), and the gain decreases in the second region 1321 of the intermediate frequency (in this example) (From about 200 Hz to about 2 KHz), and the gain in the third region 1322 of the high frequency is quite flat again (in this example, up to about 2 KHz). Phase response transfer -21-This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) 1238671 A7 B7 V. Description of the invention (19) The transfer function 1305 refers to the second region 1321 of the intermediate frequency (also That is, between about 200 Hz and about 2 KHz), the output signal remains approximately in-phase. Figure 14 illustrates the frequency response conversion function 1402 and phase conversion function 1405 for -B / -A, which are the conversion functions of the differential channel (-B) and the first input channel (X2) with + 12d B gain . In FIG. 14, as shown in FIG. 13, the frequency response conversion function 1402 has a fairly flat gain in the first region 1420 of the fundamental frequency (up to about 200 Hz in this example), and a gain in the second region 1421 of the intermediate frequency. The drop (in this example, from about 200 Hz to about 2 KHz), and the gain is again quite flat again in the third region 1422 at high frequencies (in this example, above 2 KHz). The phase response transfer function 1405 refers to the second region 1421 of the intermediate frequency (that is, between about 200 Hz and about 2 KHz), and the output signal remains approximately inverting (that is, 180 degrees). As described above, it is better to send the output signals Y1, Y2 to the closely adjacent pair of loudspeakers. The transfer functions A,-A and B are selected examples where the self-speakers are approximately adjacent. However, it may be profitable from the system 1000 of FIG. 10 or other specific embodiments described herein, in which the loudspeaker pairs are not directly connected, but are closely adjacent. FIG. 16 is a sound processing system 1600 according to another embodiment described herein, which can be used in a linear spectral weight filter. In the sound processing system 1600 of FIG. 16, a left acoustic signal 1611 and a right acoustic signal 1612 are processed and pushed, and a pair of processed acoustic signals 1648 and 1649 is sent to a pair of closely spaced loudspeakers 1624 and 1625 ( Such as left and right loudspeakers). The left and right acoustic signals 1611 and 1612 are operated by a subtractor 1642 to output a differential signal 1641 representing the difference between the left and right acoustic signals 1611 and 1612. The differential signal 1641 is fed to have a linear phase. The paper size applies to the Chinese National Standard (CNS) A4 specification (210X 297 mm).

Binding

k -22-1238671 A7 B7 V. Description of the invention (20) Spectrum weight filter 1642 with characteristics. The frequency response characteristics of the spectral weighted wavelet 1642 are generally determined by the transfer function as shown in Fig. 7A or 7B. Because the spectral weight filter 1642 has a linear phase characteristic, phase equalization and compensation are not required. Therefore, the spectrum weighting filter 1642 can be directly output to the cross-off cancellation circuit 1646, which then mixes the spectrum weighting signal with the left and right audio channels before feeding the spectrum weighting signals to the loudspeakers 1624, 1625. To compensate for the delay caused by the spectral weight filter 1642, delay components 1655 and 1656 can be added along the left and right channel paths, respectively. The delay components 1655 and 1656 have better delay characteristics equal to the latency of the linear spectral weight filter 1642. The cross-offset sales volume provided by sound processing in each specific embodiment is generally determined by the amount of "spread" of sound images. If too much cross-off is given, the resulting sound will be dull or echoed. In other words, if a small amount of traffic is given and offset, the sound image may not be wide enough or stable enough. A pair of loudspeakers for receiving sound processing information (such as loudspeakers 824 and 825 in FIG. 8 or closely spaced loudspeakers in other embodiments described herein) is preferably directly adjacent to each other; Actually, there are still effects such as sound and image expansion and high stability. In summary, the maximum acceptable isolation of a loudspeaker pair can be determined experimentally, but performance may gradually degrade as the distance between loudspeakers increases. The distance between the two loudspeakers should not exceed the highest frequency corresponding to the loudspeaker playback wavelength. For a maximum frequency of 2 KHz, this isolation corresponds to a center-to-center spacing of approximately 6 inches between the two loudspeakers. Ideally, however, the two loudspeakers are directly connected, and the greatest benefit is gained from the sound processing techniques described here. In the specific embodiments described here, caused by stereo sound images _-23- _ This paper size applies to China National Standard (CNS) A4 specifications (210 X 297 mm) 1238671

The range of sound quality improvement is wider than that in experience. For example, there is no loudspeaker between comparative sound processing. As a result, audio products (such as sound tracks) have better or improved sound effects in a wider sound field. When the listener is not in the center of the loudspeaker configuration, the sound quality can be improved. Therefore, for example, a home theater; the field sound system can provide more sounds for the listener. They can be located at the center of the loudspeaker configuration. Enjoy the playback of the special sound # product. Before any of the foregoing specific implementations, before propagating the audio products from each audio source signal to each amplifier or other system component, it is estimated that it can include any essential audio creation , Such as music pieces, soundtracks, or any other source or content with a sound department for virtual audio creation (such as a DVD or other digital recording medium). Audio products such as DVDs, cassettes, CDs, CD_R can be read from the recording medium 〇M, or can be received wirelessly, exist in any available format 'not to mention from broadcasting or point-to-point transmission. Audio products with at least left and right channel information is better (regardless of Code or not), but it can already include additional channels' for example, it can be a ring sound or other multi-channel format codes, such as Dolby-AC3, DTS, DVD_Audi0, etc. Audio properties can include temporary or permanent storage in A digital file in a format for audio playback, such as Mp3 format or digital multimedia format. The specific embodiments described herein can be implemented using digital or analog technology, or a combination thereof. As described herein, circuits, items Widely include analog components, discrete digital components, microprocessor-based or digital signal processing (Dsp), or any combination thereof. The present invention is not limited to the specific ways in which the specific embodiments of sound processing are performed. Although Here are some better or exemplified filter characteristics and transfer functions ------- ---- 24- This paper size applies Chinese National Standard (CNS) A4 specifications (210 X 297 public directors) 1238671 Five invention descriptions (22 A7, B7, etc. provide examples, you can understand the implementation of any system department, loudspeaker type, loudspeaker poetry spacing, circularity, etc., depending on the specific category: Therefore, any specific mention here ::: 二:: 〈Use instead of In addition, the specific section :: For: Explain that the spectrum weight filters related to the examples are all adjustable and have only sound preferences.… Type complaints can be seen in the specific spectrum of each specific embodiment described here. The weight filter may have spectral weight in the frequency band less than or greater than the range of version 2. ^ If you choose (the band is too large, saturation or clamping may occur, but if the selected band is too small, improper spreading effects may occur. Furthermore, if the spectrum-weighted chirp waver in the specific embodiment herein does not mitigate the cross-offset at higher frequencies, it may cause a chirp rate wave effect, leading to a zero noise point at a particular frequency. Therefore, the spectral weighted frequency band and special spectral weighted outer centroids are selected to take into account the actual limitations of the amplifier and electronic components, as well as the overall quality and effect of the amplifier output. Although the specific system components described are "connected, connected", such terms should be interpreted to imply any type of data communication or transfer, regardless of whether the components are actually connected to each other, or whether intermediary components exist or not. It will be understood without departing from this In addition to the teachings shown, various additional circuits or system components can be added. The present invention can be applied to a variety of conditions outside the home theater or surround sound system. For example, in certain circumstances, the implementation of the present invention can be applied. In personal computer systems (eg for playing audio tracks, multimedia shows or 2D “video games or multichannel sound”), automatic or media audio and video systems, portable stereo, television, radio and any other sound 25 The size of this paper mark applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) 1238671 A7 B7 5. Description of the invention (23) The state of sound reproduction. Specific embodiments find special applications depending on the conditions, where the available loudspeaker position is limited and / or the maximum distance between the left and right loudspeakers are each limited, but two adjacent or closely spaced loudspeakers are realized. For example, closely spaced pairs of left and right loudspeakers can be part of an overall portable stereo unit, or can be located above or below a computer monitor or the like. In some embodiments, the close-coupled microphones can be made to work harder without cross-offset. This is because the cross-mixing of the left and right signals requires the microphones to reproduce the inverted sound waves. To compensate for this effect, for example, it can increase the size of the amplifier that feeds the acoustic signal to the close-phase amplifier pair in some embodiments. Although the preferred embodiment of the present invention has been described herein, many changes can be made without departing from the concept and scope of the present invention. After reviewing this manual and the drawings, those who are familiar with the art can better understand such changes. Therefore, the present invention is not limited except by the spirit and scope of any accompanying patent application scope. This paper size applies to China National Standard (CNS) A4 (210X297 mm)

Claims (1)

1238671 L—A sound system including: a left speaker and a right speaker immediately adjacent to it; a left channel sound signal; a right channel sound signal; and a sound processor for receiving The left channel sound signal and the right channel bone sound signal are input, and the sound processor is configured to send the left channel sound signal and the right channel sound signal to the left amplifier and the right amplifier, respectively. The device 'intersects and offsets the left-channel audio signal and the right-channel audio signal's spectral weighted stereo differential signal (cr0ss-cancd). 2. The sound system as described in claim 1 of the patent scope, wherein the sound processor is configured to generate a difference signal representing the difference between the left channel sound signal and the right channel sound signal, and apply the spectrum weight to the difference Signal, thereby generating the spectrally weighted signal. 3. The sound system according to item 2 of the patent application, wherein the sound processor includes a subtractor for generating the differential signal. 4. If the sound system of the second scope of the patent application, the sound processor includes a spectrum weight filter for applying the spectrum weight to the differential signal, the spectrum weight filter is characterized by a considerable level of gain A first filter region, a second filter region where the gain decreases with increasing frequency, and a third filter region with a substantially horizontal gain. 5. The sound system according to item 4 of the patent application, wherein the spectral weight filter is further characterized by a roll-off of about 200 Hz from the first filter region to the second filter region. 6. For the sound system in the scope of patent application No. 5, in which the spectrum weight filtering is -27- this paper size suitable for wealth ® ® Home Standard (CNS) A4 specification (210X297 mm) AB c D 1238671 The wave filter is further characterized in that the boundary between the second filter region and the third filter region is about 2 KHz. 7. The sound system of claim 2, wherein the sound processor includes a linear filter for applying the spectral weight to the differential signal. 8. For example, the sound system of the first patent application range, wherein the sound processor further includes a phase equalizer, which equalizes the phase of the spectrum weighted differential signal before offsetting, and a plurality of phase compensators, which Within the range of the desired cross-offset frequency band, the phase characteristics of the phase equalizer and the spectral weight filter are complementary, and they are connected in series with the left channel audio signal and the right channel audio signal before they cross and cancel each other. . 9. The sound system as claimed in claim 8, wherein the phase equalizer includes a plurality of all-pass filters, which has a first phase conversion function as a whole, and wherein the phase compensator each includes a plurality of all-pass filters. It has a second phase conversion function as a whole to complement the comprehensive phase characteristics of the phase equalizer and the spectrum weighted waver in the desired frequency band range that is offset. 10. The sound system according to item 8 of the patent application, wherein the phase includes a second-stage filter. D u. The sound system according to item i of the patent application scope, wherein the left-channel sound signal includes a ring-field left-channel sound signal coupled with a ring-field left microphone. The right loudspeaker's ring γ response signal 'and the left loudspeaker and the right loudspeaker:] The left field loudspeaker and the right loudspeaker of the back field are used to facilitate the sound of the ring field. -28- 1238671 A8 B8 Used in stereo systems. 12. The sound system according to item 丨 of the patent application, where the sound processor can magnify the detection area and the whole or part of the stereo system and execute it digitally. 13. —A system for adapting sound reproduction, the stability of its sound image, including:-the left amplifier and-the right amplifier next to it; a left channel sound signal; a right channel sound Signals; and, the sound is processed to receive the left-channel audio signal and the right-channel audio signal as input, and output a differential signal representing a difference between the left-channel audio signal and the right-channel audio signal; a spectrum A weighting filter for receiving the differential signal as an input and outputting a spectrum weighting signal; and a cross-offset circuit for mixing the spectrum weighting signal and the left channel boost signal with the right channel audio signal, This generates a first loudspeaker signal to the left loudspeaker and a second loudspeaker signal to the right loudspeaker. 14. The system according to item 13 of the scope of patent application, wherein the spectral weight filter is characterized by a first filter region with a considerable level of gain, a second filter region with decreasing gain as frequency increases, and a A third filter region with considerable horizontal gain. 15. The system according to item i 4 of the patent application range, wherein the spectral weight filter is further characterized by a change from the first filter region to the second filter region of about 200 Hz. -29- The size of this paper applies to Chinese National Standard (CNS) A4 (210 X 297 mm) 1238671 A8 B8 C8 ————————— D8 _____ VI. Patent Application Range 16. The system of item 5, wherein the spectral weight filter is further characterized in that the boundary between the second filter region and the third filter region is about 2 KHz. 17. The system according to item 3 of the patent application scope further includes a phase equalizer between the spectrum weight filter and the cross-offset circuit. 18. The system according to item 17 of the scope of patent application, further comprising a first phase compensator between the left channel audio signal and the cross-offset circuit. The first phase compensator has a phase equalizer and The spectrum weighting filter is complementary to one of the integrated phase characteristics; and a second phase compensator between the right sound signal and the cross-off circuit, the second phase compensator has a phase with the integrated phase Phase characteristics are complementary. 19. The system as claimed in claim 18, wherein the phase equalizer includes a plurality of all-pass filters, and wherein the first phase compensator and the first phase compensator each include a complex number having substantially the same phase conversion function. All-pass filters. 20. The system of claim 17 wherein the phase compensator includes a second-stage filter. 2L The system according to item 13 of the patent application, wherein the spectral weight filter includes a linear filter. 22. The system according to item 13 of the patent application, wherein the left channel sound signal includes a ring field left channel sound signal electrically connected to the ring field left amplifier, wherein the right channel sound signal includes-electrical The right channel sound signal of the ring field connected to the ring = speaker, and the first speaker and -30- This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) 1238671 A8 B8 C8 ^ The second expansion shirt includes a ring field back left loudspeaker and a ring field back right loudspeaker. "Yi: 13 items of the system" wherein the subtractor circuit, frequency 4 coin counter and cross-offset circuit are implemented in whole or in part digitally. 8-24.-A sound reproduction method, which includes the following steps: Place a left loudspeaker and a right loudspeaker in close proximity; receive a left channel audio signal; receive a right channel audio signal; and generate a difference between the left channel audio signal and the right channel audio signal The differential weight signal; the spectral weight of the far-differential signal is violated, thereby generating a spectral weight signal; and the spectral weight signal and the left channel acoustic signal and the right sound boost signal are cross-offset, thereby generating the left expansion signal The first loudspeaker signal of the loudspeaker and the second loudspeaker signal of the right loudspeaker. 25. The method of claim 24 in the scope of patent application, wherein the step of generating the differential signal uses a subtractor. 26. If the method according to item 24 of the scope of patent application is applied, the step of applying the spectral weight of the differential signal is performed using a spectral weight filter, which is characterized by a A first filter region with a corresponding horizontal gain, a second filter region with a decreasing gain as the frequency increases, and a third filter region with a corresponding horizontal gain. 27. If the method of item 26 of the patent application range, Among them, the spectrum weight filter -31-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 1238671 A8 B8 C8 ________ D8 6. The scope of patent application is even more characteristic from the first filter area to the The variation of the second filter area is about 200 Hz. 28. The method according to item 27 of the patent application range, wherein the spectral weight filter is further characterized by a boundary between the second filter area and the third filter area. It is 2 KHz. 29. If the method of claim 24 of the patent application scope further includes the following steps: Before the parent offsets the spectrum weight signal and the left channel audio signal and the right channel audio signal, Perform phase equalization of the differential signal first; and perform phase compensation on each of the left channel audio signal and the right channel audio signal to compensate for the spectral weight and phase balance of the differential signal 30. The method according to item 29 of the scope of patent application, wherein the phase equalization step performed on the differential signal is performed by using a first plurality of weighted pass filters having a first phase conversion function as a whole, and wherein The phase compensation steps performed on each of the left channel audio signal and the right channel audio signal are performed by using a second and third plurality of all-pass filters, the second plurality of all-pass filters and the third The plurality of all-pass filters each have an overall phase conversion function, which can be complementary to the overall phase conversion function of the first phase conversion function and the spectral weight phase conversion function related to the step of applying the spectral weight of the differential signal. The method of item 29, wherein the phase equalizer step is performed using a second-stage filter. 32. The method according to item 24 of the scope of patent application, wherein the step of applying the far-spectrum weighting of the differential signal is performed using a linear chirped piano -32- ^ Paper size applies Chinese National Standard (CNS) A4 specification (210X297) ^) ^ --------- A8 = The method of claim 24 of the patent scope, wherein the left channel acoustic signal I includes the ring field left channel acoustic signal coupled to the ring field left amplifier, and the 4 right acoustic signal includes a coupling to the ring The ring field of the right field loudspeaker = the sound signal, and the first and second loudspeakers: the knife includes J Ai field back left loudspeaker and ring field back right loudspeaker to facilitate Ring field sound stereo system is used. 34. If the method according to item 24 of the scope of patent application is applied, one or more of the method for generating the differential knife number, the spectral weight of the differential signal, and cross offsetting the frequency weight signal and the left channel audio signal with The steps of the right channel acoustic signal are performed in whole or in part digitally. 35 · ^ A method for adjusting sound reproduction, which can enlarge the detection area and the stability of the stereo sound image. The method includes the following steps: placing a left loudspeaker and a right loudspeaker in close proximity; receiving A left-channel audio signal; receiving a right-channel audio signal; and passing the left-channel audio signal and the right-channel audio signal to the left amplifier and the right amplifier respectively The spectral weighted stereo differential signal and the left channel acoustic signal and the right channel acoustic signal are estimated from the left channel audio signal and the right channel acoustic signal. 36. The method of claim 35, wherein the spectrum weighted stereo differential signal is generated by obtaining a differential signal representing the difference between the left channel audio signal and the right channel audio signal, and the differential signal is supplied to To the spectral weighting filter. q -33- This paper is suitable for standard paper ® ϋ 鲜 (CNS) A4 size (21GX 297 public love) ~~ '---- 1238671 A BCD patent application scope 37 · If the method of patent application scope item 36, where The spectral weighting cap < is characterized by a first filter region with a fairly horizontal gain, a second filter region with an increase in name that decreases with frequency, and a third filter region with a considerable bucket gain. 38. The method according to item 37 of the patent application range, wherein the special breaking of the spectral weight is that the performance from the first filter area to the second filter area is about 200 Hz. 39. The method according to item 38 of the claim range, wherein the spectral weight filter is further characterized by the sum of the second filter area and the third filter area being approximately 2 KHz. 40. If the method according to item 36 of the scope of patent application is included, the method includes performing the steps of the bass-enhanced stereo differential signal and the left-channel audio signal and the right-channel audio signal. The phase weighting step of the spectrum weight 遽 wave plug output. The method for applying item 4G of the scope of patent application further includes performing a phase compensation step for each of the left and right audio signals to perform the phase equalization step for the output of the driving spectrum weight m. Pay. 42. If the method of applying for the scope of patent scope item No. 40, the phase equalization step of the output of the spectrum weight reduction device is to use the first plurality of all-pass chirpers, and to each of the left The phase compensation step of the channel sound signal and the reputation sound signal is performed by using the second and third complex urge all-pass filters. 43. As for the method of applying for item 4G of the patent scope, the phase equalization step -3 cores 1238671 A8 B8 ___ C8 uses a second-stage filter for this. 4 The method in item 36 of the patent application range, wherein the spectrum weighted wave filter includes a linear filter. 45 · The method according to item 35 of the patent application, wherein the left channel sound signal includes a ring field left channel sound signal coupled to a ring field left amplifier, and the 4 right sound card sound signal includes a feed to the ring The ring right sound ring signal of the field right loudspeaker, and the first loudspeaker and the second loudspeaker respectively include a ring back loudspeaker and a ring back loudspeaker to facilitate the ring. Field sound stereo system is used. 46 · —A sound reproduction system used in the stereo sound effect system of framed field sound, including: a ring field left amplifier; a ring field right amplifier; a pair of closely adjacent ring field back speakers; and A ring field left channel sound signal electrically connected to the ring field left amplifier; a ring field right channel sound signal electrically connected to the ring field right amplifier; and a sound processor for receiving the left sound The audio signal of the channel and the audio signal of the right channel are input. The configuration of the sound processor is to generate a differential signal representing the difference between the left channel audio signal of the ring field and the right channel audio signal of the ring field, and apply the differential signal. Spectrum weighting, thereby generating a spectrum weighting signal, and cross offsetting the spectrum weighting signal with the ring field left channel audio signal and the ring field right channel audio signal, thereby generating the ring field back-35- Again applicable to China National Standard (CNS) A4 specification (210 X 297 public directors) A BCD 1238671 Sixth, the first loudspeaker signal and the second loudspeaker signal of the patent-applicable loudspeaker. 47. The sound reproduction system according to item 46 of the patent application, wherein the pair of ring field back loudspeakers includes a ring field left back loudspeaker and a ring field right back loudspeaker. Every 48. The sound reproduction system according to item 46 of the patent application range, wherein the pair of ring field back loudspeakers are located in a single loudspeaker cover. 49. The sound reproduction system of the 46th scope of the patent application further includes a left speaker, a right speaker, and a center speaker. 2. For example, the sound reproduction system of item 46 of the scope of patent application further includes a first decorrelation circuit between the audio signal of the left channel of the ring field and the left amplifier of the ring field, and—between the The second adjusting isolation circuit between the ring field right channel audio signal and the ring field right amplifier. 51. The sound reproduction system according to item 46 of the patent application, wherein the sound processing module includes a spectrum weighting filter to apply the spectrum weighting to the differential signal, and the spectrum weighting filter is characterized by a considerable level gain & lt A first wave filter section, a second filter section where the gain decreases with increasing frequency, and a third filter section with a considerable level of gain. 52. The sound reproduction system according to item 51 of the patent application range, wherein the spectral weighted wave filter is further characterized by a change from the first filter region to the second filter region of about 200 Hz. 53. The sound reproduction system according to item 52 of the patent application range, wherein the spectral weighted wavelet is further characterized by a boundary between the second filter region and the third filter region of about 2 KHz. 54. The sound reproduction system according to item 46 of the patent application scope, wherein the sound processor further includes a phase equalizer to equalize the difference before cross-offset. -36- This paper standard applies Chinese National Standard (CNS) A4 size (210 X 297 mm) AB c D 1238671 夂, patent application range, signal phase division, and multiple phase compensators whose phase characteristics are complementary to the comprehensive phase characteristics of the phase equalizer and the spectral weight filter. The phase compensator Pin the ring field left channel audio signal and the ring field right channel audio signal in series with it. 55. The sound reproduction system according to claim 54 in the patent application scope, wherein the phase equalizer includes a plurality of all-pass filters, and each of the phase compensators includes a plurality of all-pass phase filters. 56. The sound reproduction system according to item 46 of the patent application range, wherein the sound processor includes a linear filter to give the differential signal spectral weight. 57. For example, the sound reproduction system of item 46 of the patent scope, wherein the ring field left amplifier and the ring field right amplifier are both dipole amplifiers. 58 · —A sound reproduction system including: a left loudspeaker and a right loudspeaker, the distance of which corresponds to the highest frequency wavelength emitted from the left and right loudspeakers; and a sound processor for receiving a Left-channel audio signal and a right-channel audio signal. The configuration of the sound processor can mix the polarities before the left-channel audio signal and the right-channel audio signal are respectively supplied to the left amplifier and the right amplifier. Conversely, the crossover of the spectrum weights cancels out the signal, the left channel audio signal, and the right channel audio signal, thereby amplifying the correct sound image produced by the left and right speakers. -37- This paper size applies to Chinese National Standard (CNS) A4 (210X297 mm)