Signal process method, signal process circuit and LED dimming circuit thereof

摘要

In one embodiment, method of signal processing can include: (i) determining a high level sampling pulse amount by counting a number of pulses of a first clock signal during a high level portion of a period of a first PWM; (ii) generating a first pulse signal based on a second clock signal and the high level sampling pulse amount; (iii) determining a low level sampling pulse amount by counting a number of pulses of the first clock signal during a low level portion of the period of the first PWM signal; (iv) generating a second pulse signal based on the second clock signal and the low level sampling pulse amount; and (v) generating a second PWM signal based on the first and second pulse signals.

主权项

1. A method of signal processing, the method comprising:
a) determining a high level sampling pulse amount by counting a number of pulses of a first clock signal during a high level portion of a period of a first pulse-width modulation (PWM) signal; b) generating a first pulse signal based on a second clock signal and said high level sampling pulse amount, wherein a frequency of said second clock signal is higher than a frequency of said first clock signal; c) determining a low level sampling pulse amount by counting a number of pulses of said first clock signal during a low level portion of said period of said first PWM signal; d) generating a second pulse signal based on said second clock signal and said low level sampling pulse amount; and e) generating a second PWM signal based on said first and second pulse signals, wherein a period of said second PWM signal is less than a period of said first PWM signal, and wherein a duty cycle of said first PWM signal matches a duty cycle of said second PWM signal.