公开(公告)号：US11658620B2

公开(公告)日：2023-05-23

申请号：US17459050

申请日：2021-08-27

Applicant: NXP B.V.

Inventor： Robert van Veldhoven ,  Khalid Mabtoul ,  Dmitrij Andreevits Sjwed

IPC: H03F3/181

CPC classification number: H03F3/181 ,  H03F2200/03 ,  H03F2200/264

Abstract: A digital signal generator apparatus and method is described. The digital signal generator includes a counter, an integrator and a comparator. The counter counts up or down from an initial counter value dependent on a counter control input. The comparator has a first input coupled to the counter output, a threshold input and a comparator output coupled to the counter control input. The integrator has an input coupled to the counter output and an output coupled to the digital signal generator output. The digital signal generator determines the count direction after the initial direction dependent on the comparison between a threshold value applied to the threshold input and the counter output value. The digital signal generator may implement the generation of a waveform having an approximation to a raised cosine function. The generated waveform may be used for audio artefact reduction in an audio amplifier during mute or unmute operations or during power up power down operations.

公开(公告)号：US20220123696A1

公开(公告)日：2022-04-21

申请号：US17459050

申请日：2021-08-27

Applicant: NXP B.V.

Inventor： Robert van Veldhoven ,  Khalid Mabtoul ,  Dmitrij Andreevits Sjwed

IPC: H03F3/181

Abstract: A digital signal generator apparatus and method is described. The digital signal generator includes a counter, an integrator and a comparator. The counter counts up or down from an initial counter value dependent on a counter control input. The comparator has a first input coupled to the counter output, a threshold input and a comparator output coupled to the counter control input. The integrator has an input coupled to the counter output and an output coupled to the digital signal generator output. The digital signal generator determines the count direction after the initial direction dependent on the comparison between a threshold value applied to the threshold input and the counter output value. The digital signal generator may implement the generation of a waveform having an approximation to a raised cosine function. The generated waveform may be used for audio artefact reduction in an audio amplifier during mute or unmute operations or during power up power down operations.