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19.数字式直接放大器在Yamaha公司研制的一种带DAC的放大器器中,DAC的输出电平被增加,后几级大的增益被等量减小,改善了信噪比如。如果增加DAC的输出,减小后几级放大器的增益,就能获得等量功率输出的话,相应地可以通过增加DAC的输出,减少放大器的级数达到这一目的。因此,信噪比可能减小的量等于减少放大器的级数产生的噪声。
19. Digital Direct Amplifier In a DAC with DAC developed by Yamaha, the output level of the DAC is increased, and the large gains of the last few stages are reduced by the same amount to improve the signal-to-noise ratio. Increasing the output of the DAC and reducing the gain of the latter stage of amplifier will result in equal power output, which can be achieved by increasing the output of the DAC and reducing the number of stages of the amplifier accordingly. Therefore, the signal to noise ratio may be reduced by an amount equal to the noise generated by reducing the number of stages of the amplifier.