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提出了一种适用于数字视频编码器的直接数字频率合成器 DDFS(Direct Digital Frequency Synthesizer)新结构 .通过采用相位截断噪声整形技术 ,使所需要的 ROM面积下降为传统结构的 1/ 8.同时采用了其它优化策略进一步减少了 ROM的面积 ,整个 DDFS仅需要 115 2 bit的 ROM.DDFS输出在 PAL 制式下信噪比为 6 9d B,NTSC制式下为 70 .7d B
A new DDFS (Direct Digital Frequency Synthesizer) architecture for digital video encoder is proposed, which reduces the required ROM area to 1/8 of the traditional one by adopting phase-cut noise shaping technique. Other optimization strategies are used to further reduce the ROM area, requiring only 115 2 bits of ROM for the entire DDFS. The SDR output has a signal-to-noise ratio of 6 9 dB in PAL mode and 70.7 dB in NTSC mode