Patent ID: 11881821
Assignee: SPREADTRUM COMMUNICATIONS (SHENZHEN) CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An audio processing device, comprising: a digital-to-analog converter, a power amplifier circuit, and a signal generation circuit;
the signal generation circuit comprising: a switch module, a voltage generation module, and a signal generation module, wherein,
the switch module connected with the voltage generation module comprises at least one control switch, the switch module configured to receive a frequency-divided signal to cause the at least one control switch to open or close based on the frequency-divided signal;
the voltage generation module is respectively connected with the switch module and the signal generation module, configured to generate a first voltage and a second voltage, wherein the at least one control switch controls the first voltage and the second voltage to change;
the signal generation module is connected with the voltage generation module and configured to generate, based on the received first voltage and second voltage, a carrier signal having a frequency consistent with a frequency of the frequency-divided signal;

the digital-to-analog converter connected with the power amplifier circuit, configured to receive a digital audio signal, convert the digital audio signal received into an analog audio signal, and input the analog audio signal into the power amplifier circuit;
the signal generation circuit is connected with the power amplifier circuit and configured to generate a carrier signal with a preset frequency and to output the generated carrier signal to the power amplifier circuit;
the power amplifier circuit is respectively connected with the digital-to-analog converter and the signal generation module, configured to receive the analog audio signal, amplify the analog audio signal based on the carrier signal, and output the amplified signal, wherein a frequency of the amplified signal is consistent with a frequency of the carrier signal, and a clock frequency of the digital-to-analog converter is an integral multiple of the frequency of the carrier signal.