What is the difference between a digital amplifier and an analog amplifier

With the technological progress and the continuous maturity of power amplifier technology, digital power amplifier chips have been widely used in home theater and TV or surveillance TV, mooring multimedia room speakers, projectors and other products, so digital power amplifier and analog power amplifier-TDO type power amplifier comparison, which one is better? What are the differences, what are each difference, and why are digital power amplifiers slowly replacing traditional analog power amplifiers?

In fact, for power amplifiers, the final criterion is still the quality of sound quality. So how did you get started? Let me introduce the differences between digital power amplifiers and analog power amplifiers.

First of all, before understanding the differences between digital power amplifiers and analog power amplifiers, you must first know what is a digital power amplifier and what is an analog power amplifier?

Digital power amplifiers are amplifiers with low distortion, low noise, and large dynamic range, analog power amplifiers are devices that take a low-power analog signal as input and output a more powerful version of the same signal.

Well-known audio power amplifiers include Class A amplifiers, Class B amplifiers, Class A and B amplifiers, and Class D amplifiers. In terms of signal form, the first three types of amplifiers handle all that is analog signals, i.e. analog audio power amplifiers, that is, analog power amplifiers. The latter is a digital audio power amplifier that processes digital signals, that is, digital power amplifiers.

In the first decade of the 21st century, although the underlying technology dates back to the 20s of the 50th century. More precisely, Class D amplifiers, which differ from pure analog amplifiers, are capable of taking a pure digital signal and amplifying it to produce an analog speaker-level output. On the other hand, using analog-to-digital converters, they can also take analog signals and amplify them. The main advantage of digital amplifiers over analog amplifiers is higher power, allowing cheaper digital circuits to produce amplifications as large as more elaborate and expensive Class AB analog amplifiers.

And... The difference between digital power amplifiers is that most people don't notice analog power amplifiers.

1. Digital power amplifiers are divided into power mode digital power amplifiers and sound quality mode digital power amplifiers. Digital power amplifiers in power mode are linear and use digital signal amplification to make the output and input signals identical. During the transmission of digital signals, the sound is closer to the real (hi-fidelity) and closer to the human ear. The sound quality mode is custom circuitry for 4/4 surround speakers and, of course, analog power amplifiers that reduce the use of low-power playback devices such as 13-43 watts, so I won't go into detail here.

2. Digital power amplifier with large analog-to-digital. For adjustment, you usually need to make sure that the power of the signal is about 150 watts, which is relatively smooth, and that the number of ordinary analog outputs is enough for usual. When it is too large or too small, there will be obvious noise or overload.

3. The weight size of the digital power amplifier is lighter, the cost is lower, and the power is higher. Digital power amplifiers typically use switching power supplies for power, and analog power amplifiers use transformers. The advantages of digital power amplifiers are high efficiency and low heat dissipation requirements, simple peripheral circuitry and low cost. The advantages of analog power amplifiers are better sound than digital power amplifiers, but the disadvantages are high cost, HIGH heat dissipation requirements, heavy weight, complex circuit structure, and high maintenance difficulty.

4. The position of the converted digital power amplifier channel is similar to the audio interface. You need to determine the sampling rate of the input signal, for example about 24 bits. The analog power amplifier input is a 20-bit signal. Digital power amplifiers can output 24-bit signals by coding. This needs to be adjusted by yourself. All in all, the advantage of digital power amplifiers is to adjust the volume by themselves, but the advantage is that the noise is not easy to handle and sounds smoother. The advantages of analog power amplifiers are that the noise is easy to handle and the sound is messy.

Power amplifier matching needs to consider the power of all signals, and choosing the right side can make the sound better. The matching of sample rate, bit rate, and channel is also critical for signal noise. For debugging, the digital power amplifier can adjust the volume directly using the power amplifier line control board. Good way. Since a normal power amplifier obtains data from another device through a signal, it also needs to be adjusted according to the sampling rate of the power amplifier line control board, so it requires a lot of learning to debug.