Audio playback circuit and terminal
An audio playback and circuit technology, applied in stereo circuit arrangements, sensor protection circuits, stereo communication earphones, etc., can solve problems such as voltage difference, left and right channel isolation, and achieve the effect of improving isolation
Active Publication Date: 2021-03-09
HONOR DEVICE CO LTD
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Problems solved by technology
Therefore, when the absolute value of the voltage of the signal received by a channel playback circuit from the processor is greater than the signal of the sound source of the main board, the common ground point and the sound source of the main board will exist due to the aforementioned wiring impedance, magnetic bead impedance, etc. Voltage difference
The voltage difference causes current to flow through the earphone of the other channel, thereby generating sound playback on the other channel, resulting in poor isolation between the left and right channels
Method used
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Embodiment Construction
[0051] The application scenarios and concepts involved in the embodiments of the present application are introduced below. In a stereo scene, the left and right channels are played independently. When the terminal plays stereo, the stereo earphone and the audio chip can form a sound playback loop. Wherein, the audio chip may be integrated in the terminal, or may be an independent chip. The audio chip may be, for example, an audio codec (coder-decoder, CODEC) chip, or may be a high-fidelity (high-fidelity, HiFi) chip. The audio chip can support audio compression (coder) and decompression (decoder). The audio chip can use hardware to complete audio compression and decompression, which can save CPU resources and improve terminal operating efficiency. The audio chip involved in the embodiment of the present application may be a CODEC chip, a HiFi chip, or other chips for audio codec, or a new chip for audio codec that will appear in the future. No limit.
[0052] Wherein, the...
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Embodiments of the present application provide an audio playback circuit and a terminal. The audio playback circuit includes: a first current path, which is used to divide the current output by the left channel circuit when the left channel circuit outputs the left channel audio signal, so as to adjust the second channel fed back to the first end of the right channel earphone. Voltage; when the left channel circuit outputs the left channel audio signal and the right channel circuit does not output the right channel audio signal, the second voltage is equal to the voltage at the second end of the right channel earphone; the second current path is used for When the right channel circuit outputs the right channel audio signal, the current output by the right channel circuit is shunted to adjust the first voltage fed back to the first end of the left channel earphone; the right channel circuit outputs the right channel audio signal and When the left channel circuit does not output the left channel audio signal, the first voltage is equal to the voltage of the second terminal of the left channel earphone. The audio playback circuit of the embodiment of the present application can improve the isolation between the left and right audio channels.
Description
technical field [0001] The present application relates to the technical field of terminals, in particular to an audio playback circuit and a terminal. Background technique [0002] When the terminal plays stereo audio, the left and right channel playback loops play independently. The left and right channels can be played differently or simultaneously. In order to ensure that the left and right channels are independently played without affecting each other, the isolation problem needs to be considered, that is, the playback loops of the two channels must be isolated to avoid the mutual influence of the left and right channels. [0003] The two headphones in the two channels are usually connected to a common ground point. The common ground point needs to be connected to the audio source ground on the main board, and there are wiring impedance, magnetic bead impedance, etc. between the common ground point and the audio source ground on the main board. Therefore, when the abs...
Claims
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IPC IPC(8): H04R5/033H04R3/12
CPCH04R3/12H04R5/033H04R3/007H04R5/04
Inventor 黄停邱钰鹏冯英群
Owner HONOR DEVICE CO LTD