What is the meaning of the DSP sound field effect of the amplifier

In addition, the concert hall live performance due to the orchestra and the audience face to face, playing the atmosphere of the scene and the effect of the scene with the use of audio equipment to appreciate the music is different, in the performance of the scene is very easy to cause the audience's **** ming, along with the music of the climax of the ups and downs of the audience will produce a certain amount of emotional input. The audio equipment is used to record music program software for playback, when the original music recording process, due to the recording of each recording personnel on a variety of sound frequencies feel different, different aesthetics and different music and their preferences for music is different, so in the music recording process intentionally or unintentionally added to the individual's subjective ideas. When the audio equipment playback recorded music, due to a variety of equipment technical indicators, equipment with each other, the listening environment, equipment debugging and other factors, will also directly affect the effect of playback music. Although the playback sound of audio equipment can not fully reproduce the effect of the concert hall scene, but through technical means of music playback sound modification, complementary and other beautification processing, so that the playback sound of the equipment close to the effect of the scene, or to produce some of the scene in the scene does not have something, so that it is more beautiful and pleasant to listen to. "DSP" system known as "digital sound field processing technology" (DigitalSoundFieldProcessing). It is developed and produced by the Japanese company Yamaha in the eighties, specializing in the generation of new sound field processing system similar to the effect of live performance. Yamaha sound field in the research mainly for the performance of the various elements of the sound field, they found that in addition to the performance of the size and shape of the space of the scene, the sound of a variety of reflections is a pivotal role, generally there are mainly the following kinds. (1) direct sound and reflected sound: from the sound source directly to the listener's ear of the sound wave is called direct sound. As sound waves have a certain direction of the diffusion effect, and thus most of the sound waves from the sound source is through the listening environment of the walls and ceiling reflections to the listener's ear, the sound waves transmitted through the reflection is known as the reflected sound. (2) Reflected sound: When sound waves are reflected, the first reflected sound that reaches the listener's ear is called reflected sound. The shape of the sound wave is almost the same as the direct sound because of the short time of the sound wave reflection. (3) Delayed reverberation: Delayed reverberation refers to the reflected sound that reaches the listener's ear after the primary reflected sound, and its transmission is not directional, so if there is too much delayed reverberation, it will affect the clarity of the playback sound. The amount of delayed reverberation and listening to the shape of the environment, size and building materials. (4) Damping factor: the so-called damping factor refers to the total amount of high-frequency reverberation sound attenuation, which plays a leading role in the performance of the sound field characteristics of the source, adjusting the damping factor can make the depth of the sound field reproduction sense of change. For the above factors, Yamaha adopts the special "Single Point Quad Microphone Measurement" (SingPointQuadMiking) method to collect sound field data such as direct sound, reflected sound and reverberant sound from theaters, large stadiums, churches, and dance halls, and then analyzes the collected data through a computer. The computer analyzes the collected data, gets the system software of sound field processing, and then solidifies it into the DSP processing chip. When the equipment playback, the appreciator as long as the corresponding program content of the performance of the live sound field data, you can more easily simulate a variety of live effects. Therefore, in the signal has a Dolby directional logic decoder, and then join the DSP sense of the scene of the signal, the creation of the sound field will be more rose, so that the enjoyment of the immersive enjoyment of the appreciator, for example: in the simulation of pop/rock concerts, the sound field playback sound field lively, with a sense of movement; in the simulation of the 70 mm thriller movie sound field, playback of the sound field spatial sense of a strong sense of depth, wide characteristics. Yamaha digital sound field processing technology can generally produce the following simulated sound field. (1) HallAinEurope: European Concert Hall A (2,500 seats) Characteristics: A fan-shaped concert hall with low indoor reflection of sound waves, which produces a more detailed playback sound. (2) HallBinEurope: European Concert Hall B (2,000 seats) features: box-type concert halls, the stage is equipped with a special sound reflection board, which can produce a more powerful reflection to strengthen the sound field of the stage, so that the playback of sound mixed thick, strong. (3) HallCinEurope: European Concert Hall C (1,700 seats) Features: a box-type concert hall, the interior has a variety of devices used to produce sound wave reflection, so that the playback sound is more mellow. (4) HallDinU.S.A: U.S. Concert Hall D (2,600 seats) features: interior design with American style, can produce strong mid-range and high-frequency playback sound. (5) HallEinEurope: European Concert Hall E (round 2200 seats) Features: Interior with a round stage, reverb effect is more obvious. (6) LiveConcert: Live Concert features: a large circular concert hall, from the reflection of the surrounding sound waves to produce a better surround sound effect, in the playback of karaoke effect is better. (7) CHURCH: Church effect features: with the traditional church sound environment, can reproduce the organ and other instruments to create the atmosphere of the church. (8) LargeChapel: large chapel effect characteristics: to produce a large church long sound echo of the acoustic environment. (9) ROCKCONCERT: rock concert features: the ability to reproduce the United States of America Los Angeles rock music club scene with dynamic effects. (10) JAZZCLUB: Jazz Club features: a small jazz club, ceiling and floor distance of ten close to the playback sound more intimate, delicate. (11) CONCERTVIDEO1: Concert Video 1 (CLassical/Opera: Classical/Opera) Features: In the replay of the opera program, can be played on the scene of the main hall backseat and the stage ideally combined, so that appreciators are in an environment full of music. This mode can provide a strong orchestral sound and a loud singing voice. (12) CONCERTVIDEO1: Concert Video 1 (Recital: Solo Recital) Characteristics: It can produce an environment with good surround sound, replay sound with appropriate reverb, and has a good performance on reproducing the inner meaning of music. (13) CONCERTVIDEO2: Concert Video 2 (Pop/Rock: Pop/Rock Music) Features: This mode creates a strong dynamic atmosphere, expanding the image space and sound space around the screen, as if the appreciator is in the midst of a large crowd. (14) CncertVideo2: Concert Video 2 (Pavilion: medium-sized stadium) Features: Can produce a huge in the playback sound space, with a certain echo effect. (15) TVTHEATER: TV Theater (MonoMovie: MonoMovie) Features: This mode can reproduce the sound characteristics of mono movies, the use of the center speaker can clearly express the picture of the characters in the dialogue, so that the picture and the characters of the dialogue into one. (16) TVTHEATER: TV Theatre (Variety/Sports: Sports Programs) Features: can produce a strong competitive atmosphere of the stadium, playback of the sports commentator's voice is located in the middle of the soundstage, and athletes and the audience's shouts all over the soundstage, it is very easy to mobilize the emotions of the appreciators. (17) MOVIETHEATER1: Cinema 1 (70mm Spectacle: 70mm thriller) Features: This mode of playback, can reproduce the effect of 70mm cinema, it can accurately reproduce the sound of the sound source, with a high degree of realism. (18) MOVIETHEATER1: Cinema 1 (70mmMusical: 70mm Musical Movie) Features: This mode mainly reproduces the playback characteristics of the concert hall scene, with a certain reverberation effect, the positioning of the various instruments is more accurate, and it can reproduce the depth of the sound field and the background reflections. (19) MOVIETHEATER2: Cinema 2 (70mmAdventure: 10mm action movie) Features: This playback mode is mainly used for playback of 70mm / AC-3 multi-channel film programs, the entire soundstage is clear and majestic. (20) MOVIETHEATER2: Cinema 2 (70mmGeneral: 70mm Drama Movie) Features: This mode highlights the three-dimensionality of the playback soundstage, especially the dialogue of the characters in the plot, so that the audience is very easy to put into the feelings. (21) DOLBYPROLOGICSURROUND: Dolby Directional Surround Features: This mode is mainly used for accurate Dolby decoding and digital sound field processing, which improves the phase of the playback sound and the separation between the channels, so that the sound and image position is more accurate. It is important to note that there is a difference between a typical DSP processor and Yamaha's DSP digital sound field processing technology. General DSP processor can only simulate a few such as: churches, concert halls and concert halls of the sound field effect, as it relies only on the circuitry of the signal to carry out a relatively simple processing, so playback simulation of the sound field effect is more general, with or without the DSP processor is not much difference. Yamaha DSP digital sound field processor simulation of the sound field is very clinical atmosphere, such as simulation of the church effect of the sound field, the church has a depth of echo effect is very obvious, so that appreciators seem to be in the church in the remote, ethereal environment. Another example: when the simulation of medium-sized stadium sound effects, stadium wide sound field, with a stimulating effect of the athletic atmosphere, so that people are emotionally excited.