US 12,069,446 B2
Audio processing circuit, car-mounted player, and wireless playback system
Pan Xiong, Shenzhen (CN)
Assigned to SHENZHEN JIEMEISI INDUSTRIAL CO., LTD., Shenzhen (CN)
Filed by SHENZHEN JIEMEISI INDUSTRIAL CO., LTD., Shenzhen (CN)
Filed on Jan. 17, 2023, as Appl. No. 18/098,084.
Claims priority of application No. 202211444357.X (CN), filed on Nov. 18, 2022.
Prior Publication US 2024/0171906 A1, May 23, 2024
Int. Cl. H04R 3/00 (2006.01); H04B 1/034 (2006.01); H04B 1/3822 (2015.01)
CPC H04R 3/00 (2013.01) [H04B 1/034 (2013.01); H04B 1/3822 (2013.01); H04R 2420/07 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An audio processing circuit comprising:
a signal acquisition module comprising a wireless input module and/or a wired input module, wherein the wireless input module is configured to receive an audio signal based on a wireless technology, and the wired input module is configured to receive the audio signal based on a wired technology;
an audio processing module, configured to process the audio signal received by the signal acquisition module to improve sound quality of the audio signal;
a frequency modulation (FM) transmitter module, configured to perform FM transmission on the audio signal output by the audio processing module;
a power supply module, configured to supply power to the signal acquisition module, the audio processing module and the FM transmitter module;
wherein the wireless input module includes a wireless module, and the wireless module is configured to receive the audio signal based on a wireless technology;
the audio processing module comprises a first processing submodule;
the first processing submodule comprises a signal frequency division unit, a frequency division adjustment unit, and an amplification and combination unit;
the signal frequency division unit is electrically connected to the power supply module and the wireless module, and the signal frequency division unit is configured to perform frequency division of the audio signal received by the wireless module;
the frequency division adjustment unit comprises at least one of a treble adjustment subunit, a bass adjustment subunit, and a midrange adjustment subunit; the treble adjustment subunit is configured to adjust a high frequency signal obtained by a frequency division of the signal frequency division unit, and the bass adjustment subunit is configured to adjust a low frequency signal obtained by the frequency division of the signal frequency division unit, and the midrange adjustment subunit is configured to adjust an intermediate frequency signal obtained by the frequency division of the signal frequency division unit;
the amplification and combination unit comprises an amplification and combination chip and a voltage division subunit, the amplification and combination chip is electrically connected to the frequency division adjustment unit, the FM transmitter module, and the power supply module; the amplification and combination chip is configured to amplify and combine signals output by the frequency division adjustment unit, and output the signals to the FM transmitter module;
the voltage division subunit comprises a first resistor, an eighth pin of the amplification and combination chip is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to the power supply module, the eighth pin of the amplification and combination chip is configured to provide a reference power supply.