Circuit for using speaker cable for radio frequency signal transmission

Patent metadata

Field	Value
Publication number	US-12593171-B2
Application number	US-202318507897-A
Country	US
Kind code	B2
Filing date	Nov 13, 2023
Priority date	Sep 27, 2023
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

Various embodiments described herein support or provide for using speaker cables for radio frequency signal transmission, including generating, via an audio hardware component included in a circuit, a differential audio signal; generating, via a radio frequency hardware component included in the circuit, a radio frequency signal; and outputting the differential audio signal and the radio frequency signal via a speaker cable communicatively coupled to the circuit, the speaker cable being configured to operate as a Planar Inverted F-Antenna (PIFA).

First claim

What is claimed is:

1 . A circuit comprising: an audio hardware component configured to output a differential audio signal; a radio frequency hardware component configured to output a radio frequency signal; an audio power amplifier output matching network communicatively coupled to the audio hardware component and a first capacitor, a positive audio signal output pad, and a first inductor that is communicatively coupled to a negative signal output pad and a second capacitor; a radio frequency matching network communicatively coupled to the radio frequency hardware component and a third capacitor that is communicatively coupled to the audio power amplifier output matching network, the first capacitor, and the first inductor; and a speaker communicatively coupled to a speaker cable configured to operate as an antenna for radio frequency signal transmission, that comprises plural wires communicatively coupled to the positive audio signal output pad and the negative signal output pad.

2 . The circuit of claim 1 , wherein the audio power amplifier output matching network comprises a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a second inductor, and a third inductor, the fourth capacitor communicatively coupled to the first resistor and the second inductor, the fifth capacitor communicatively coupled to the second resistor and the third inductor.

3 . The circuit of claim 2 , wherein the first resistor and the second resistor are communicatively coupled to ground.

4 . The circuit of claim 1 , wherein a frequency range of the radio frequency signal is between 2.4 GHz and 2.5 GHz, and wherein the audio power amplifier output matching network comprises a hardware component that matches impedance of the audio hardware component to impedance of the speaker, and wherein the radio frequency matching network comprises a hardware component that matches impedance of the radio frequency hardware component to the impedance of the speaker.

5 . The circuit of claim 1 , wherein the positive audio signal output pad is communicatively coupled to a positive wire included in the speaker cable, and wherein the negative signal output pad is communicatively coupled to a negative wire included in the speaker cable.

6 . The circuit of claim 5 , wherein the speaker cable functions as an antenna for radio frequency signal transmission during operation.

7 . The circuit of claim 5 , wherein energy of the radio frequency signal passes through the first capacitor with little or no energy passing through the first inductor, causing the speaker cable to operate as an antenna for radio frequency signal transmission.

8 . The circuit of claim 6 , wherein the antenna for radio frequency signal transmission is a Planar Inverted F-Antenna (PIFA).

9 . The circuit of claim 1 , wherein the first inductor is communicatively coupled to the negative signal output pad and directly to ground without including the second capacitor.

10 . The circuit of claim 9 , wherein the speaker cable functions as a monopole antenna for radio frequency signal transmission during operation.

11 . A method comprising:
generating, via an audio hardware component included in a circuit, a differential audio signal; generating, via a radio frequency hardware component included in the circuit, a radio frequency signal; and outputting the differential audio signal and the radio frequency signal via a speaker cable communicatively coupled to the circuit, the speaker cable being configured to operate as a Planar Inverted F-Antenna (PIFA).

12 . The method of claim 11 , wherein the circuit comprises an audio power amplifier output matching network, a radio frequency matching network, the audio power amplifier output matching network being communicatively coupled to the audio hardware component and a first capacitor, a positive audio signal output pad, and a first inductor that is communicatively coupled to a negative signal output pad and a second capacitor, the radio frequency matching network being communicatively coupled to the radio frequency hardware component and a third capacitor that is communicatively coupled to the audio power amplifier output matching network, the first capacitor, and the first inductor.

13 . The method of claim 12 , wherein the audio power amplifier output matching network comprises a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a second inductor and a third inductor, the fourth capacitor communicatively coupled to the first resistor and the second inductor, the fifth capacitor communicatively coupled to the second resistor and the third inductor.

14 . The method of claim 13 , wherein the first resistor and the second resistor are communicatively coupled to ground.

15 . The method of claim 12 , wherein the positive audio signal output pad is communicatively coupled to a positive wire included in the speaker cable, and wherein the negative signal output pad is communicatively coupled to a negative wire included in the speaker cable.

16 . The method of claim 12 , wherein energy of the radio frequency signal passes through the first capacitor with little or no energy passing through the first inductor, causing the speaker cable to operate as an antenna for radio frequency signal transmission.

17 . The method of claim 12 , wherein the first inductor is communicatively coupled to the negative signal output pad and directly to ground without the second capacitor.

18 . The method of claim 17 , wherein the speaker cable functions as a monopole antenna for radio frequency signal transmission during operation.

19 . The method of claim 11 , wherein a frequency range of the radio frequency signal is between 2.4 GHz and 2.5 GHz.

20 . A system comprising:
an audio hardware component configured to output a differential audio signal; a radio frequency hardware component configured to output a radio frequency signal; an audio power amplifier output matching network communicatively coupled to the audio hardware component and a first capacitor, a positive audio signal output pad, and a first inductor that is communicatively coupled to a negative signal output pad and a second capacitor; a radio frequency matching network communicatively coupled to the radio frequency hardware component and a third capacitor that is communicatively coupled to the audio power amplifier output matching network, the first capacitor, and the first inductor; and a speaker communicatively coupled to a speaker cable that comprises plural wires communicatively coupled to the positive audio signal output pad and the negative signal output pad, the speaker cable is configured to operate as a Planar Inverted F-Antenna (PIFA) or a monopole antenna for radio frequency signal transmission.

Assignees

• Beken Corp

Inventors

• Xia Siqing
• Wang Ruimin
• Xu Qunshan
• Zhang Shuguang

Classifications

• H03F1/56

  Modifications of input or output impedances, not otherwise provided for · CPC title

• H03F2200/03

  the amplifier being designed for audio applications · CPC title

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03F2200/423

  Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation · CPC title

• H03F3/20

  Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) · CPC title