A method, circuit and device for eliminating crosstalk between audio signal playback channels
An audio signal and audio playback technology, applied in the circuit field, can solve the problems that the audio signal crosstalk in the earphone cannot be eliminated, and the ground impedance of the transfer line cannot be sampled by the PA reference.
Active Publication Date: 2021-06-15
HUAWEI DEVICE CO LTD
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Problems solved by technology
[0010] In addition, when a mobile phone that supports a USB Type-C headset is connected to an OMTP headset or a CTIA headset through a USB Type-C headset to OMTP headset and CTIA headset adapter cable, since the ground impedance of the adapter cable cannot be sampled by the PA reference, here In one scenario, existing technologies cannot eliminate the problem of audio signal crosstalk in headphones
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[0066] When the audio signal in the terminal is divided into two channels (such as the left channel and the right channel) and are respectively played through two audio signal playback devices (such as earphones, speakers, etc.), the two corresponding audio signal playback devices Crosstalk occurs between audio signal playback channels, which affects the playback quality of audio signals. In the prior art, the upper end of the resistor connected in series between the ground terminal of the audio signal player and the ground terminal of the terminal is used as a feedback point to pull back the power amplifier of the two audio signals of the terminal as a reference source to eliminate the two Crosstalk will occur between audio signal playback paths, but when the gain of the two audio signals changes, the amplitude of the crosstalk signal will also change, and this method cannot effectively suppress the crosstalk signal.
[0067] In order to effectively suppress the crosstalk bet...
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A method, circuit, and device for eliminating crosstalk between audio signal playback paths, the circuit comprising: a first load, a second load, and a candidate load module; the candidate load module includes multiple third loads, and the impedance matching module It is used to select at least one third load in the candidate load module, so that the selected third load satisfies a≤|I when the selected third load cooperates with the first load and the second load N1 -I C1 |≤b, a≤|I N2 -I C2 |≤b,I N1 Indicates the magnitude of the interference signal generated by the audio signal on the first audio signal playback path on the ground impedance of the terminal, I C1 Represents the magnitude of the cancellation signal generated by the audio signal on the first audio signal playback path on the selected third load, I N2 Indicates the magnitude of the interference signal generated by the audio signal on the second audio signal playback path on the ground impedance of the terminal, I C2 Indicates the magnitude of the cancellation signal generated by the audio signal on the second audio signal playback channel on the selected third load.
Description
technical field [0001] The present application relates to the field of circuit technology, and in particular to a method, circuit and device for eliminating crosstalk between audio signal playback channels. Background technique [0002] The earphones used in mobile phones mainly include earphones based on the open mobile terminal platform (open mobile terminal platform, OMTP) standard, earphones based on the cellular telecommunications industry association (CTIA) standard, and universal serial bus (universal serial bus) based earphones. bus, USB) Type-C headset. Among them, since the order of the microphone and the ground wire of the OMTP earphone and the CTIA earphone plug is reversed, in order to be compatible with the OMTP earphone and the CTIA earphone, it is necessary to add a circuit for identifying the OMTP earphone and the CTIA earphone and replace the connection between the microphone and the ground wire in the mobile phone. The analog switch of the USB Type-C head...
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IPC IPC(8): H04R3/00
CPCH04R3/00
Inventor 张洵杨江涛况火根徐建国
Owner HUAWEI DEVICE CO LTD