| 摘要 |
<p>A downlink transmission device for an audio signal and an electronic signature tool comprising same. The downlink transmission device for an audio signal comprises: an audio interface (101), the audio interface (101) comprising a first pin (1), a second pin (2) and a third pin (3), the first pin (1) being one of a microphone pin and a ground pin, the second pin (2) being the other one of the microphone pin and the ground pin, the third pin (3) being a single-track audio output pin or one of multi-track audio output pins, and the audio signal being transmitted via the third pin (3); and an impedance circuit (102), one end of the impedance circuit (102) being coupled with the third pin (3), and the other end of the impedance circuit (102) being coupled with the first pin (1) and the second pin (2) separately. The downlink transmission device for an audio signal can ensure smooth downlink transmission of an audio signal, and ensure the data transmission quality.</p> |
