Midi recruitment

Sampling value? Or a sample value. It is used to measure the fluctuation of sound parameters, and it is a sound card with resolution, which can also be understood as the resolution of sound card processing sound. The larger the value, the higher the resolution, and the more realistic the sound recording and playback. A two-bit sound card is a sound card that uses digital voice signals to collect and play sound files, and a one-bit sound card objectively reflects the accuracy of digital voice signal description. Common 8-bit and 16-bit sound cards, now the mainstream products on the market are 16 and above sound cards. about

Sampling frequency: sampling frequency refers to the number of times sound samples are obtained per second. The higher the sampling frequency, the better the sound quality and the more realistic the sound reproduction. The sampling frequencies are 8KHz, 1 1.025KHz, 22.05kHz, 16KHz, 37.8KHz, 44. 1KHz, 48KHz, etc. There are 22KHz and 44KHz 16-bit sound cards, which are equivalent to the sound quality of ordinary FM radio, and 22KHZ and 44KHZ are equivalent to the sound quality of CD.

MIDI:MIDI (Musical Instrument Digital Interface) is used for musical instrument digital interface. This is a unified exchange protocol between electronic musical instruments and computers, and it is synonymous with MIDI computer music. MIDI files are very small. Computer music synthesis. FM synthesis commonly used in early ISA sound cards, namely "FM", is a MIDI synthesis process based on sound oscillation. Due to the limitations of the technology itself, its effect is far from satisfactory.

At present, most sound cards adopt wave table synthesis (wave table). First of all, it samples all sounds (including various ranges and sounds) that can be produced by various real musical instruments and stores them as wave table files. When playing music, according to the issued command, find the corresponding audio information from the "form" in the form of waves, and process and play the information recorded in the synthesized MIDI file. Because it is a real instrument sample, this effect is naturally better than FM.

The recording accuracy of musical instrument sound information of universal wave table is 44. 1 and 16 bits, so as to achieve the most realistic playback. Theoretically speaking, the larger the capacity of wave table synthesis, the better the effect. Wave table synthesis is usually divided into different special microprocessors or CPUs, which are used to place and process sampling files, soft wave tables and hard wave tables.

Polyphony: "Polyphony" refers to the maximum sound produced by the number of MIDI songs in a few seconds. storehouse

Wave table: The wave table library (DLS loadable sample) is quite similar. Its principle and the soft wave table sound and color library are also stored in the hard disk and transferred to the system memory for playback. But the difference is that using DLS technology to synthesize MIDI depends on the audio processing chip of the sound card, not CPU calculation. This wave table library can be updated at any time, and DLS timbre editing software can be used.

Audio API: the programming interface of API, which contains various meanings such as voice localization and processing instructions and specifications. Its performance will directly affect the expressive force of three-dimensional sound effects. The popular APIs are Direct Sound 3D, A3D and EAX.

Aureal's 3D (A3D): A3D is a proud recruitment company that has developed interactive 3D sound technology. The application of this technology can lead to the sound of the surrounding 3D positioning monitor and real listening experience according to the user's input and sound changes. A3D is divided into 1.0 and 2.0 versions. The 1.0 version includes two main application fields: A3D surround and A3D interaction. With special emphasis on the stereo hardware environment, the real sound field simulation 2.0 1.0 acoustic tracking technology can be obtained to further improve the performance. It is the best 3D audio positioning technology at present.