Abstract: Disclosed are a power supply circuit, power supply method, audio power amplifier and integrated circuit. The power supply circuit applied to an audio power amplifier may include: a measurement sub-circuit used for measuring a voltage of an audio signal input to the audio power amplifier, which corresponds to output power of the audio power amplifier; a control sub-circuit used for determining a target reference voltage range according to a voltage range of the audio signal within a predetermined time period, which is selected from a plurality of predetermined reference voltage ranges, wherein the voltage range of audio signal within the predetermined time period is included in the target reference voltage range; and a power supply sub-circuit used for generating, based on the target reference voltage range, a power supply voltage that matches the output power of the audio power amplifier, so as to supply power to the audio power amplifier.

Abstract: A method implemented on a computing device having at least one processor, storage, and a communication platform connected to a network for determining blood pressure includes: receiving a request to determine a blood pressure of a first subject from a terminal, obtaining data relating to the first subject, the data relating to the first subject including data relating to heart activity of the first subject and personal information relating to the first subject, extracting target features relating to the first subject from the data relating to the first subject, determining a preliminary blood pressure of the first subject using a prediction model based on the target features relating to the first subject, determining a predicted blood pressure of the first subject using an optimization model based on the preliminary blood pressure and sending the predicted blood pressure of the first subject to the terminal in response to the request.