计算机系统应用
計算機繫統應用
계산궤계통응용
APPLICATIONS OF THE COMPUTER SYSTEMS
2013年
7期
81-84,94
,共5页
雷鸣%王新房%刘侨%孙鑫
雷鳴%王新房%劉僑%孫鑫
뢰명%왕신방%류교%손흠
回声隐藏%短时能量%能量阈值%功率倒谱
迴聲隱藏%短時能量%能量閾值%功率倒譜
회성은장%단시능량%능량역치%공솔도보
echo hiding%short-time energy%energy threshold%power cepstrum
在前后向双核回声隐藏思想的基础上，提出了一种基于回声隐藏的改进算法。根据设定的水印的嵌入率来确定音频段的能量阈值，选择短时能量高于此阈值的音频段嵌入水印信息，并且引入功率倒谱检测法来检测水印信息。仿真结果表明改进后的算法具有不可感知性更高，隐藏效果好并且显著降低了水印信息检测的误码率。
在前後嚮雙覈迴聲隱藏思想的基礎上，提齣瞭一種基于迴聲隱藏的改進算法。根據設定的水印的嵌入率來確定音頻段的能量閾值，選擇短時能量高于此閾值的音頻段嵌入水印信息，併且引入功率倒譜檢測法來檢測水印信息。倣真結果錶明改進後的算法具有不可感知性更高，隱藏效果好併且顯著降低瞭水印信息檢測的誤碼率。
재전후향쌍핵회성은장사상적기출상，제출료일충기우회성은장적개진산법。근거설정적수인적감입솔래학정음빈단적능량역치，선택단시능량고우차역치적음빈단감입수인신식，병차인입공솔도보검측법래검측수인신식。방진결과표명개진후적산법구유불가감지성경고，은장효과호병차현저강저료수인신식검측적오마솔。
Based on the method of dual backward and forward delay kernels, an improved algorithm of echo hiding in which watermark codes embedded the audio signal is proposed in this paper. The energy of each segment into which the original audio is first divided was computed. The energy threshold of audio segments is set by the given rate of embedding watermark codes. Then the audio segments whose energy value above the energy threshold are embedded with the watermark codes and the secret information is detected with a power cepstrum computing method. The simulation results show that the improved algorithm has a significant improvement in imperceptibility and can remarkably decrease the bit error rate of detected watermark codes.
