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Because digital amplifiers work entirely differently from conventional analog amplifiers, they overcome some of their inherent shortcomings of analog amplifiers and have some exceptional capabilities. The next introduces the gap between electronic power amplifier and power amplifier that is analog.
The overload capacity of digital power amplifier circuits is much higher than that of analog power amplifiers. When the energy amplifier tube operates in the terminal region during normal operation, once the energy amplifier tube operates in the projection area, harmonic distortion happens and the level of stimulation increases exponentially. The sound quality is rapidly deteriorating. The electronic power is obviously in the saturation zone and the cut-off zone when the power is amplified. Provided that the power amplifier tube isn't damaged, the distortion won't grow rapidly. Since the electronic power amplifier uses a switching amplifier circuit, the performance is extremely high, as much as 75~90 (the analog power amplifier efficiency is only 30~50), and basically does not create heat during operation. Because of this, it does not mimic the static current consumption of this power amplifier. All the energy is almost reserved for the sound output. After adding the analog amplification without negative feedback, it's better"energy" characteristics, and the transient response is great. Feeling is extremely powerful. Difference 2, crossover distortion and mismatch distortion Analog Class B power amplifiers are placed in zero-crossing distortion because of the nonlinearity of the transistor at low currents. Distortion in the positive and negative intersections of the output waveform (the transistor will operate from the cut-off region for small signals, no current will pass, resulting in output Severe distortion). The electronic amplifier just works in the switching state and does not create crossover distortion. The analog power amplifier includes a mismatched distortion of the output waveform as a result of inconsistent push-pull characteristics. Therefore, when designing the push-pull amplifier circuit, the requirements for the power amplifier tube are very rigorous. The digital power amplifier does not have any particular prerequisites for its pairing of the switch tube, and essentially doesn't need to be strictly chosen to be utilized. Difference 3, power amplifier and speaker matching Since the internal resistance of the power amplifier tube in the analog power amplifier is large, once the speakers using different resistance values are matched, the functioning condition of the analog power amplifier circuit is affected by the magnitude of the load (speaker). The internal resistance of the digital power amplifier doesn't exceed 0.2 Ω (the internal resistance of the change tubing plus the inner resistance of this filter), and the resistance value (4~8 Ω) relative to the load (speaker) is completely negligible, so there is no matching problem with the speaker. Difference 4, transient intermodulation distortion Analog power amplifiers use nearly all negative feedback circuits to ensure that their electroacoustic parameters. From the negative feedback circuit, in order to suppress parasitic oscillations, phase compensation circuits are utilized, which will generate transient intermodulation distortion. The digital power amplifier does not use any analog amplification feedback circuit for electricity conversion, thus avoiding transient intermodulation distortion. Difference 5, solid image localization For analog power amplifiers, there is normally a phase difference between the output signal and the input signal, and also the phase distortion is different once the output is different. The digital power amplifier employs digital signal amplification to make the output and the input phase exactly the same, and the phase shift is zero, so the audio image is positioned right. Length 6, update The electronic amplifier can achieve high power by simply replacing the switch amplification module. The high-power switch amplification module has a low price and has wide prospects in the professional area. Difference 7, manufacturing debugging Analog power amplifiers have debugging problems at all levels of work, which isn't conducive to mass production. The digital power amplification component is an electronic circuit, and generally functions normally with no debugging, and is particularly suitable for mass production. During the above introduction, I think that everyone has already understood the difference between digital power amplifier and professional power amplifiers.
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