Abstract: Embodiments of this application provide a speaker module and a portable electronic device. The speaker module includes a first speaker module and a second speaker module. The first speaker module includes a first housing and a first speaker monomer accommodated in the first housing, and the first speaker monomer has a first diaphragm. The second speaker module includes a second housing and a second speaker monomer accommodated in the second housing, and the second speaker monomer has a second diaphragm. The first speaker module and the second speaker module are sequentially disposed in a vertical direction, and a vibration direction of the first diaphragm is opposite to a vibration direction of the second diaphragm, so that momentum variations (mv) ? of the speaker module are offset against each other, thereby resolving a problem that a vibration feeling is strong when the speaker module works.

Abstract: Embodiments of this application provide a speaker module and a portable electronic device. The speaker module includes a first speaker module and a second speaker module. The first speaker module includes a first housing and a first speaker monomer accommodated in the first housing, and the first speaker monomer has a first diaphragm. The second speaker module includes a second housing and a second speaker monomer accommodated in the second housing, and the second speaker monomer has a second diaphragm. The first speaker module and the second speaker module are sequentially disposed in a vertical direction, and a vibration direction of the first diaphragm is opposite to a vibration direction of the second diaphragm, so that momentum variations (mv) ? of the speaker module are offset against each other, thereby resolving a problem that a vibration feeling is strong when the speaker module works.

Abstract: A method for controlling a supply voltage of a power amplifier, and an electronic device are provided. The method includes acquiring a state of an envelope of a to-be-amplified signal, where the state of the envelope includes a rising edge and a falling edge; acquiring a first voltage corresponding to the envelope when the state of the envelope is the falling edge, and controlling the supply voltage of the power amplifier according to the first voltage. The method also includes acquiring a second voltage corresponding to a maximum peak value of the to-be-amplified signal in a first preset time when the state of the envelope is the rising edge, and controlling, according to the second voltage, the supply voltage of the power amplifier in the first preset time.

Abstract: An electronic product protective case includes a rear housing and a holder which further includes a magnet assembly, and the magnet assembly includes a first magnet group and a second magnet group. The first magnet group includes a first magnet and a third magnet that have opposite polarities. The second magnet group includes a second magnet and a fourth magnet that have opposite polarities. The first magnet and the second magnet have opposite polarities. The third magnet and the fourth magnet have opposite polarities. The first magnet and the second magnet are mutually absorbed, and the third magnet and the fourth magnet are mutually absorbed.

Abstract: An electronic product protective case includes a rear housing and a holder which further includes a magnet assembly, and the magnet assembly includes a first magnet group and a second magnet group. The first magnet group includes a first magnet and a third magnet that have opposite polarities. The second magnet group includes a second magnet and a fourth magnet that have opposite polarities. The first magnet and the second magnet have opposite polarities. The third magnet and the fourth magnet have opposite polarities. The first magnet and the second magnet are mutually absorbed, and the third magnet and the fourth magnet are mutually absorbed.

Abstract: A method for controlling a supply voltage of a power amplifier, and an electronic device are provided. The method includes acquiring a state of an envelope of a to-be-amplified signal, where the state of the envelope includes a rising edge and a falling edge; acquiring a first voltage corresponding to the envelope when the state of the envelope is the falling edge, and controlling the supply voltage of the power amplifier according to the first voltage. The method also includes acquiring a second voltage corresponding to a maximum peak value of the to-be-amplified signal in a first preset time when the state of the envelope is the rising edge, and controlling, according to the second voltage, the supply voltage of the power amplifier in the first preset time.