| 主权项 |
1. An audio amplifier comprising:
a mode controller configured to generate a control signal based on a bandwidth of an audio input signal, wherein the control signal has a first state in response to the bandwidth being a first bandwidth value and a second state in response to the bandwidth being a second bandwidth value, and wherein the second bandwidth value is greater than the first bandwidth value; and a variable-length finite impulse response (FIR) filter comprising
a first fixed-length FIR filter configured to generate a first filtered signal based on a first digital audio signal, wherein the first digital audio signal is based on the audio input signal,a second fixed-length FIR filter configured to generate a second filtered signal based on the first digital audio signal, wherein a length of the second fixed-length FIR filter is greater than a length of the first fixed-length FIR filter, andan output module configured to
select the first filtered signal in response to the control signal having the first state,select the second filtered signal in response to the control signal having the second state, andprovide the selected one of the first filtered signal or the second filtered signal as an output signal; and an analog module configured to generate, based on the output signal, an amplified analog signal. |
