Systems and methods for reduction of audio artifacts in an audio system with dynamic range enhancement

摘要

In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.;A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

主权项

1. An apparatus for providing an output signal to an audio transducer, comprising:
a signal path comprising:
an analog signal path portion having an audio input for receiving an analog input signal, an audio output for providing the output signal, and a selectable analog gain, and configured to generate the output signal based on the analog input signal and in conformity with the selectable analog gain; anda digital signal path portion having a selectable digital gain and configured to convert a digital audio input signal into the analog input signal in conformity with the selectable digital gain;wherein a transfer function of the signal path causes an effective digital gain applied at the analog input signal to have a transient response; and a control circuit configured to, responsive to an indication to switch between gain modes of the signal path:
switch the selectable analog gain between a first analog gain and a second analog gain;switch the selectable digital gain between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain; andcontrol an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path by switching from the first analog gain to the second analog gain at a duration of time after switching from the first digital gain to the second digital gain and at a point in time during a duration of the transient response.