Power amplifier circuit

Abstract

The invention provides a power amplifier circuit which comprises a pre-amplifying circuit with two output ends, a low-pass filtering circuit connected at one output end of the pre-amplifying circuit, a high frequency portion used for filtering audio signals higher than a first frequency, a high-pass filtering circuit connected at the other output end of the pre-amplifying circuit, a low frequency portion used for filtering audio signals lower than a second frequency and a power amplifying circuit used for merging signals output by the low-pass filtering circuit and signals output by the high-pass filtering circuit to differential signals, amplifying the differential signals and sending the differential signals to a loudspeaker. The power amplifier circuit has the advantages of being capable of effectively saving hardware and simultaneously capable of well restoring sound.

Description

technical field [0001] The invention belongs to the audio field, in particular to a power amplifier circuit. Background technique [0002] At present, various portable electronic products (portable) such as mobile phone, MP3, MP4 have entered people's life widely, and for the convenience of users, manufacturers have provided audio modules in most portable electronic products, such as figure 1 As shown, the audio module includes a pre-amplification circuit 11 , a power amplification circuit 13 and a speaker 15 . However, limited by the volume of portable electronic products, the volume and thickness of the speaker 15 are relatively small, thus causing its frequency response curve to attenuate severely at the low frequency end, such as figure 2 As shown, the attenuation usually begins at 700 Hz to 800 Hz; in addition, due to the resonance of the cavity of the speaker 15 itself, a second resonance point will appear in the frequency response curve of the speaker 15 at 6000 Hz ...

AI Technical Summary

Problems solved by technology

However, limited by the volume of portable electronic products, the volume and thickness of the speaker 15 are relatively small, thus causing its frequency response curve to attenuate severely at the low frequency end, such as figure 2 As shown, the attenuation usually begins at 700 Hz to 800 Hz; in addition, due to the resonance of the cavity of the speaker 15 itself, a second resonance point will appear in the frequency response curve of the speaker 15 at 6000 Hz to 8000 Hz (for details, see figure 1 ), thus affecting the restoration of the sound

Images