sound source, that is, tone resources, is divided into two categories in total.
The first group is a hardware sound source, and the presentation method is electronic instrument . The internal hardware has a huge sound library support, and generally has the most outstanding tone sampling on the market;
The second group is a software sound source. To run on the MIDI interface on the computer, it needs to have the support of the host software. The common format is VST, which is loaded by the host. The quality of the tone is simply determined by the developer's sampling level. Fair evaluation is made, and excellent sound sources can achieve the effect of fake and real.
1. Technical means
1. Digital audio: It is a technology that uses digital means to record, store, edit, compress or play sound.
2. Analog audio: a technology that transmits, records, plays and processes sound signals in an analog state.
2. Different characteristics
1. Digital audio: First, convert the audio file, then convert these level signals into binary data to save. When playing, convert these data into analog level signals and send them to the speaker for broadcast.
2. Analog audio: After the sound picking process, it is recorded in a magnetic recording or mechanical scale. At this time, the changes in the remaining magnetic or dense patterns on the tape and the fluctuations in the recording sound slot are all corresponding to and proportional to the changes in the sound signal.
3. Two layers of meaning
Another layer of meaning of the sound source refers to the device that plays the sound source carrier. The signal that changes continuously in time and the amplitude continuously over time is called an analog signal (for example, sound waves are analog signals, and the current and voltage signals transmitted in the audio system are also analog signals). The sound source that records and processes the analog signals is an analog source, such as tape/cart, LP/LP phonograph. The signals recorded and processed by analog audio sources are the true nature of sound (to be precise, the signal converted from sound). They can be directly amplified by the traditional amplifier , which is convenient and direct to processing; the digital audio sources record and process are abstract binary data streams formed by the combination of 0 and 1, which is very unintuitive.
sound waves are analog and cannot be used directly for digital audio sources. They must be converted into digital signals through the conversion device before they can be recorded on the digital audio source carrier. During playback, the data read by the digital audio source device cannot be directly amplified by traditional amplifiers and must be converted into an analog signal first.
is visible, and the digital audio source signal processing process is much more complicated. However, the advantages of digital audio sources are very outstanding: the signal-to-noise ratio and dynamic range are far superior to that of analog audio sources. The quality of the signal does not decrease after multiple replication and multiple transmission links. This cannot be done by analog audio sources in any case.
Why can digital audio sources have such excellent performance? The key is that there are only two states in the digital signal. No matter how strong the external interference is, as long as it does not affect the difference between the two logical states such as 0 and 1, the interference can be removed through the plastic shaping circuit and restored the original signal 100%. The message of the analog signal is directly carried on the amplitude change. If it is affected by some external interference, the amplitude may change and the message will be distorted. The damage to this message is permanent and cannot be repaired.
simulated sound is continuous in time. The basic number system in a computer is binary, quantization and encoding. The microphone converts mechanical vibration into electrical signals. Digital audio is a data sequence. In analog audio technology, the amplitude of the analog voltage indicates the sound strength. The stronger the vibration, we should also write the sound data into the computer data format, involving sampling analog and digital audio of audio. The signals recorded and processed by analog audio sources are the true nature of sound (to be precise, the signal converted from sound). They can be directly amplified with traditional amplifiers, which is convenient and direct to processing;
digital audio sources record and process abstract binary data streams formed by 0 and 1 arrangement, which are very unintuitive. Sound waves are analog and cannot be used directly as digital audio sources. They must be converted into digital signals through the conversion device before they can be recorded on the digital audio source carrier.During playback, the data read by the digital audio source device cannot be directly amplified by traditional amplifiers and must be converted into an analog signal first.
is visible, and the digital audio source signal processing process is much more complicated. However, the advantages of digital audio sources are very outstanding: the signal-to-noise ratio and dynamic range are far superior to that of analog audio sources. The quality of the signal does not decrease after multiple replication and multiple transmission links. This cannot be done by analog audio sources in any case. The biggest difference between
is that analog audio is continuous in time, digital audio is a data sequence, which is discontinuous in time, which is what we call nonlinearity.
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