Transmission of time sensitive signal

A circuitry, comprising:

• a first circuit comprising a power supply pin;
• and
• a second circuit comprising a power receiving pin and a current pulse amplitude modulation (PAM) encoder, wherein the current PAM encoder is configured to modulate a plurality of time-sensitive signals into a current PAM signal, and a plurality of different amplitudes in the current PAM signal is associated with occurrence of high level of a plurality of different combinations of time-sensitive signals in the plurality of time-sensitive signals;
• wherein the first circuit further comprises a current PAM decoder configured to receive the current PAM signal via the power supply pin from the power receiving pin and demodulate the current PAM signal to obtain a digital signal representing one or more of the plurality of time-sensitive signals transmitted from the second circuit to the first circuit.

A method, comprising:

• modulating a plurality of time-sensitive signals into a current pulse amplitude modulation (PAM) signal by a current PAM encoder provided on a Universal Serial Bus (USB) device, wherein a plurality of different amplitudes in the current PAM signal is associated with occurrence of high level of a plurality of different combinations of time-sensitive signals in the plurality of time-sensitive signals, and the USB device further comprises a power receiving pin and operates at the same frequency as an access point (AP);
• receiving the current PAM signal via a power supply pin of the AP from the power receiving pin;
• and
• demodulating the current PAM signal by a current PAM decoder provided on the AP to obtain a digital signal representing one or more of the plurality of time-sensitive signals transmitted from the USB device to the AP.