Subjective testing indicates that the quality of cs - acelp is equivalent to that of the 32kbit / s adaptive differential pulse code modulation ( adpcm ) under error - free conditions and it outperforms g . 726 under error condition . in this paper , standard c is adopted in realization of the algorithm , presents program strategies and steps of algorithm of each module . the coder and decoder is tested by utterances with noise 用標(biāo)準(zhǔn)c語(yǔ)言仿真實(shí)現(xiàn)了該算法,計(jì)算了mos分值,女聲: 4 . 180497 ,男聲: 4 . 199782 ,并在相同的測(cè)試語(yǔ)句中加入噪聲進(jìn)行測(cè)試,含噪語(yǔ)句通過該編解碼器,輸出的合成語(yǔ)音用主、客觀評(píng)價(jià)標(biāo)準(zhǔn)評(píng)價(jià),與原始不含噪語(yǔ)音效果差別不大,平均mos分值為:女聲4 . 1375 ,男聲4 . 1668 ,說明該算法是優(yōu)秀的編解碼算法。
2g : in 1989 , two technologies from the " world of sound studio " are combined on a pc expansion card for the first time : fm synthesis made famous by yamaha synthesizers and 8 - bit pcm pulse code modulation at 11 . 25 khz . for a long time , " soundblaster " becomes synonymous with the term sound card , and the first step toward the pc as " multimedia machine " was taken 11989年,兩項(xiàng)由world of sound studio發(fā)展出來(lái)的新科技首次被結(jié)合在個(gè)人電腦的擴(kuò)充卡上:因?yàn)閥amaha音源合成器以及8 - bit pcm pulse code modulation at 11 . 25 khz的興起,使得fm音源成為這時(shí)期的主流,使用fm音源的聲卡聲霸卡soundblaster幾乎成了該產(chǎn)品的代名詞。
We made an improvement in overcoming the defects in speech signal adaptive delta modulation ( abbr . adm ) , such as slope overloading and grain noise . in this method , numerical sliding average filtering was used for filtering decoding speech signal . experiments and analyses indicate that the method makes waveforms in good agreement between the decoding of adm and the original pulse coding modulation ( abbr . pcm ) signal , and considerably improves , the playback speech quality in naturalness , legibility and under standability 針對(duì)語(yǔ)音信號(hào)自適應(yīng)增量調(diào)制( adm )方式中斜率過載和顆粒噪聲缺點(diǎn),提出了一種改進(jìn)方法,它利用滑動(dòng)平均方法對(duì)解碼后的信號(hào)進(jìn)行數(shù)字濾波.試驗(yàn)和分析表明,該方法使解碼后的信號(hào)波形與原脈沖編碼調(diào)制( pcm )波形具有很好的一致性,使再生語(yǔ)音質(zhì)量在自然度、清晰度和可懂度方面比改進(jìn)前均有較大提高