| 抗阻塞干扰的低速率语音编码传输算法 |
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| 引用本文： | 张鑫,崔慧娟,唐昆. 抗阻塞干扰的低速率语音编码传输算法[J]. 清华大学学报(自然科学版), 2005, 45(1): 25-27 |
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| 作者姓名： | 张鑫 崔慧娟 唐昆 |
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| 作者单位： | 清华大学,电子工程系,微波与数字通信技术国家重点实验室,北京,100084;清华大学,电子工程系,微波与数字通信技术国家重点实验室,北京,100084;清华大学,电子工程系,微波与数字通信技术国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目(60272020) |
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| 摘 要： | 为满足在跳频信道上的语音传输需求,研究了一种抗阻塞干扰的"滑动窗"语音传输算法。将传输码流均匀地分成若干片段,用定长的"滑动窗"在码流上滑动并截取其中的一段连续片段作为某跳频点的数据。接收端比较连续若干跳的重叠部分,判断并恢复出"坏跳"数据。对每个片段进行差错控制保护,通过"联合最大后验概率译码"的方法抵抗更高误码率的影响。测试表明:在有阻塞干扰的跳频信道上,"滑动窗"算法的分段信噪比平均高出传统的连续可变斜率增量调制算法20dB。
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| 关 键 词： | 语音信号处理 阻塞式干扰 滑动窗 低速率语音 |
| 文章编号： | 1000-0054(2005)01-0025-03 |
| 修稿时间： | 2004-01-06 |
Low-bit-rate speech coding and transmission algorithm for defending the wideband rejective interference |
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| ZHANG Xin,Cui Huijuan,TANG Kun. Low-bit-rate speech coding and transmission algorithm for defending the wideband rejective interference[J]. Journal of Tsinghua University(Science and Technology), 2005, 45(1): 25-27 |
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| Authors: | ZHANG Xin Cui Huijuan TANG Kun |
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| Abstract: | A sliding window algorithm was developed for speech communications on Frequency-Hopping (FH) channels with wideband rejective interference. The transmitted bit stream is divided into equal slices with a fixed length "sliding window". Several slices are transmitted as the data in one hop. The overlapped parts of the data of consecutive hops are compared to make a bad hop decision at the receiver. Each slice is error protected using Joint Maximum Posterior Probability decoding. Simulations show that the average segmental signal-to-noise ratio of the sliding window algorithm exceeds that of the continuously variable slope delta algorithm by more than 20 dB for the same channel conditions. |
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| Keywords: | speech signal processing rejective interference sliding window low-bit-rate speech coding |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
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