Industrial Technology Research Institute

Realtek Semiconductor Inc.

Hsin-Pei Lee

Wei-Zen Chen

Wen-Yu Huang

An estimation method suitable for a receiver and includes the following steps: calculating a relative signal-to-noise ratio, and determining whether the relative signal-to-noise ratio is higher than, lower than or within a threshold range; in response to determining that the relative signal-to-noise ratio is higher than the threshold range, estimating the signal quality indicator as a first preset value, wherein the first preset value represents a best signal quality; in response to determining that the relative signal-to-noise ratio is higher than the threshold range, estimating the signal quality indicator as a first preset value, wherein the first preset value represents a best signal quality; in response to determining that the relative signal-to-noise ratio is within the threshold range, estimating the signal quality indicator as an output value of a function according to a bit error rate, wherein an input value of the function is the relative signal-to-noise ratio.

Estimation method for signal quality indicator of advanced television systems committee standards

A frequency synthesizer and a method for frequency synthesis are provided. The frequency synthesizer includes a subband phase-locked loop (PLL) and a main PLL. A divisor of an adjustable non-integer frequency divider in the subband PLL is adjusted, and a channel frequency of a maximum frequency band of all frequency bands is output. A divisor of an adjustable integer frequency divider in the main PLL is adjusted, and a center frequency required for each frequency band of the all frequency bands is output. The center frequency and the channel frequency are mixed by a mixer to produce a band frequency. A quantization noise generated by the adjustable non-integer frequency divider is filtered out by the subband PLL to reduce the impact of the quantization noise on the main PLL.

Growing community of inventors

Hsinchu, Taiwan

Hsin-Pei Lee