Signal processing system and terminal device
A signal processing system includes: an interference source; and a band-stop filter. A first terminal of the band-stop filter is electrically connected to the interference source, a second terminal of the band-stop filter is grounded, and the band-stop filter is configured to filter a baseband signal output by the interference source. The interference source includes a first main board; or the interference source includes a target module and a metal frame used for fastening the target module, and the target module is a display module or a camera module.
1. A signal processing system, applied to a terminal device and comprising:
an interference source; and
a band-stop filter, wherein a first terminal of the band-stop filter is electrically connected to the interference source, a second terminal of the band-stop filter is grounded, and the band-stop filter is configured to filter a baseband signal output by the interference source; wherein
the interference source comprises a target module and a metal frame used for fastening the target module, and the target module is a display module; the first terminal of the band-stop filter is electrically connected to the metal frame, and the band-stop filter is configured to filter a display signal that is output by the metal frame.
2. The signal processing system according to claim 1 , wherein the signal processing system further comprises:
a second main board, wherein a second terminal of the band-stop filter is electrically connected to a grounded member on the second main board.
3. The signal processing system according to claim 2 , wherein the band-stop filter comprises:
a second capacitor, wherein a first terminal of the second capacitor is electrically connected to the metal frame, and a second terminal of the second capacitor is electrically connected to the grounded member; and
a second inductor, wherein the second inductor is connected in parallel to the second capacitor.
4. The signal processing system according to claim 3 , wherein
an inductance value of the second inductor is greater than or equal to 1 nH and less than or equal to 200 nH; and
a capacitance value of the second capacitor is greater than or equal to 0.1 pF and less than or equal to 100 pF.
5. A terminal device, comprising a signal processing system, wherein the signal processing system comprises:
an interference source; and
a band-stop filter, wherein a first terminal of the band-stop filter is electrically connected to the interference source, a second terminal of the band-stop filter is grounded, and the band-stop filter is configured to filter a baseband signal output by the interference source; wherein
the interference source comprises a target module and a metal frame used for fastening the target module, and the target module is a display module; the first terminal of the band-stop filter is electrically connected to the metal frame, and the band-stop filter is configured to filter a display signal that is output by the metal frame.
6. The terminal device according to claim 5 , wherein the signal processing system further comprises:
a second main board, wherein a second terminal of the band-stop filter is electrically connected to a grounded member on the second main board.
7. The terminal device according to claim 6 , wherein the band-stop filter comprises:
a second capacitor, wherein a first terminal of the second capacitor is electrically connected to the metal frame, and a second terminal of the second capacitor is electrically connected to the grounded member; and
a second inductor, wherein the second inductor is connected in parallel to the second capacitor.
8. The terminal device according to claim 7 , wherein
an inductance value of the second inductor is greater than or equal to 1 nH and less than or equal to 200 nH; and
a capacitance value of the second capacitor is greater than or equal to 0.1 pF and less than or equal to 100 pF.