This year, mentioning the sound quality enjoyment, I am afraid no one does not know the surround sound. When it comes to surround sound, I believe many users can say a few words. Well, the multi-channel digital surround sound system has accurate sound image localization, which can create a large sound field and realistic sense of space, so that we can be in the presence of In the cinema.
But the big guys have to be aware of this. It’s not easy to really have a multi-channel surround sound system in the home. Multi-channel surround amplifiers and up to five speakers are essential, and each The placement of the parts is also very particular. And the cost of this set of items is also very expensive, and most families still can't spend so many tickets to build a true multi-channel surround sound system.
Therefore, the author introduces the digital virtual surround sound technology to the majority of audio-visual users, which is mainly aimed at ordinary home users. With this technology, we only need to configure two speakers or a thin speaker built into the motor to play a sound similar to multi-channel surround sound.
Compared with the real multi-channel surround sound system, this digital virtual technology is still a bit worse, but we know that the cost is much less, and we don't need to ask professionals to put the speakers. Whether it is human or material, we can save a lot, and if everyone can be in the best position of the virtual system, the feeling is also not bad.
Please understand the virtual surround sound
The full name of virtual surround sound is Virtual Surround, also known as Simulated Surround, which is called non-standard surround sound technology. This type of technology uses the signal processing technology of the human head sound transfer function (HRTF) to perform complex operations on the decoded multi-channel signal with HRTF, and processes the sound in three-dimensional space according to the HRTF. The sound of the human ear conforms to the binaural effect and the auricle effect of the human, so the use of two speakers can produce a surround effect that is very close to the multi-channel. The disadvantage is that the listening position is higher.
Currently more common are Dolby Virtual Surround VSS, SRS Tru Surround from SRS, Qsur-round from Qsound, A3D from Aureal, S-Force pre-virtual surround sound system from Sony, VMAX and Spatializer from Harman The company's N-2-2DVS and more.
Below, the author will briefly introduce you to the five virtual surround sound systems: Dolby VSS virtual surround sound
To give everyone a better sound field performance, Dolby has introduced the VSS (Virtual Surround Sound) system, which is designed to fully conform to human physiology and psychoacoustic principles, and to "virtualize" surround sound for decoding The rear center and surround information are sent to the left and right channels through attenuation and virtual, respectively, which is a very cost-effective system.
It also applies the HRTF sound localization algorithm, which can simulate the human brain through computer simulation technology, and calculate the delay according to the time of the sound through the left and right ear canal, thus achieving more realistic analog surround sound.
In terms of space, orientation, envelopment and balance, VSS virtual surround sounds are done well, and the sound is not humming, the user sounds very comfortable, and the spot feels better.
Qsurround virtual surround sound
The QSurround to be introduced here is a Dolby-certified virtual multi-channel technology that performs virtual processing on both front and surround channel signals, and also performs surround sound processing during synthesis. When performing virtual positioning of speakers, sound effects Positioning is quite accurate and has a high fidelity.
In addition, Qsound's QSurround virtual technology solution also has two modes: one is phantom mode, suitable for two audio situations, mainly to convert the center and surround after being superimposed on the main channel to achieve two-speaker playback. many
The function of the channel, which allows the audience to produce illusions, achieves the effect of surround sound; the other is the real mode, suitable for multiple speaker systems, and then the main channel and surround channel are processed, directly input Their own speakers for better surround sound.
SRS virtual surround sound
SRS virtual surround sound includes multiple virtual environment technologies such as Tru Surround XT, Tru Surround HD and Tru Surround HD4. The TV needs two or four small speakers built in. With this virtual technology, they can achieve a full range of surround sound fields, which can achieve subwoofer shock.
SRS virtual surround sound is a representative 3D stereo technology that caters to the user's feeling. It can create a virtual “three-dimensional sound fieldâ€, that is, using technical means to transform two-dimensional things into more A true three-dimensional image.
It retains the original multi-channel audio information from many sound sources, which forms an additional virtual sound source, which gives the listener excellent surround sound. Another feature of the system is compatibility, which can also adapt to Dolby. Surround, Dolby Pro-Logic, Dolby AC-3 surround, THX home surround and more, and with the DTS and MPEG-2 audio systems, the compatibility is excellent.
A3D virtual surround sound
A3D is a 3D sound technology developed by Aureal Semiconductor, which uses a simple sound to create a better surround sound effect. The surround sound technology also includes A3D Surround and A3D Interactive, and A3D Surroun is certified by Dolby "Virtual Dolby".
This analog surround sound system utilizes the theory of A3D sound source tracking technology. It can create five sound streams created by two sets of audio streams. The surround sound effect is very good. The audience feels very good on the spot and the positioning effect is good. . .
In addition, the A3D analog surround sound system also uses Wavetracing algorithms technology to accurately reproduce the real environment sound, no matter at any angle, everyone can get good sound effects.
More importantly, this A3D surround sound uses the computational filtering method, and has no special effect on the sound source. Even if it moves multiple positions, the sound effect will not appear empty, which is what the general two-channel sound system can. And.
S-Force front virtual surround sound
The S-Force front-end virtual surround sound system was introduced by Sony and used in Sony's BRAVIA LCD TV. The system uses the inertia of the human ear to receive sound, providing 5.1-channel surround sound with two speakers, allowing people to feel immersive when watching large movies.
In general, the five virtual surround sound systems are still quite good in terms of sound fluency and accuracy, accuracy of sound image localization and spatial sense. If you can sit in a better position, these virtual surround sound systems will feel as much as real surround sound. I believe everyone should be able to accept these virtual systems.
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