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How to distinguish different sound module?

Author:    Source:vire    Release time: 2016-06-23 16:36:54


Sound module, that tone of resources, a total is divided into two categories. The first groups are hardware audio, presentation to the electronic musical instrument is most common, internal hardware has a huge sound library support, in general, has the market's most prominent voices sampled; second source software groups is that such source to the computer MIDI interface running on, needs the support of the host software, a common format for the VST, loading use by the host, the merits of pure tone to the developers decided to sampling standards and fair evaluation, excellent sources can achieve real results.

What is the analog audio and digital audio? The main difference?

Time in a row, and the amplitude of the signal changes continuously over time, known as analog signals (analog signals such as sound waves, sound transmission system current, voltage signal is analog signal), the recording and processing of analog signals is an analog audio source, such as a tape / deck, LP / LP player; the time is not continuous, by only 0 and 1 two changes of signal called digital signal, recording and processing digital audio signals, called digital audio sources such as CD / CD machine, DVD-a / DVD-A player, SACD / SACD players.

Analog audio signals are recorded and processed sound (to be exact conversion from electrical signals from the voice) true colors, you can directly use the conventional amplifier, easy to deal with them directly;

Digital audio recording, processing are 0 and 1 of binary data stream abstract arrangement formed by combining, very intuitive. Sonic is analog, digital audio can not be used directly by the conversion device must be converted digital signals to be recorded on digital audio carrier. During playback, digital audio device data can not be directly read out from the traditional amplifier, it must be converted to analog signals for the job. Visible, digital audio signal processing process is much more complex. However, very prominent advantages of digital audio sources: SNR and dynamic range is far better than analog source, the signal quality after repeated copying and a plurality of transmission links is not decreased, and this analog sources in any case impossible.

Why digital audio sources to have such a good performance? The key lies in digital signal only 0,1 two states, no matter how strong outside interference, they do not affect the identification of these two logic states 0, 1, and finally the interference can be removed by the shaping circuit, 100% recovery the original signal. The message of the analog signal directly carried on the amplitude changes, if outside interference by one o'clock, it is possible to change the amplitude, it distorted the message, the message of this damage is permanent and can not be repaired.

sound module

What is CD specifications?

The audio CD specification is Sony and Philips jointly developed. Sound signal using the sampling frequency of 44.1kHz, 16bit quantify each sampling point, then LPCM (linear pulse code modulation) encoded into a digital signal, digital signal using a modular approach saved in a special disc, made of the CD. CD film base sheet is generally made of plastic, in which a surface layer is molded signals, there is one out of the pits on the pressure signal layer, which pits represents the 0 and 1 message. Enhanced laser reflection signals outside layer and then coated with a layer of very thin aluminum film (also gold-plated), when the signal for reading. The CD in two sizes, one of the most common diameter of 12cm, the data capacity of 650MB, approximately to 74 minutes of music; the other is called the Mini CD, a diameter of 8cm, the data capacity of about 185MB, can store about 20 minutes of music.



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