音頻信號處理基礎(chǔ)篇(編輯修改稿)
2025-08-28 14:30 本頁面
【文章內(nèi)容簡介】 bits 線性量化 /非線性量化 量化信噪比： 6b dB。 + 復(fù)讀機(jī)規(guī)范：聲音從磁帶上復(fù)讀到芯片上，再用耳機(jī)聽芯片上的聲音時(shí)有用信號和噪聲之間的幅度差，標(biāo)準(zhǔn)規(guī)定 ≥34dB。 Listen to the sounds… keep_friends_with(16k_mono).wav keep_friends_with(16k_mono) 8bit線性量化的文件，明顯帶了背景噪聲。 從經(jīng)驗(yàn)出發(fā)，可接受的量化 bit，應(yīng)該是？ 入手：實(shí)驗(yàn)的原材料 16kHz or 8kHz采樣率的語音文件； 16bit or 14bit 線性量化； ； 3 我 常用的音頻處理的工具 , using c。 matlab cooledit Matlab (Mathworks) ? Math. environment ? Signal processing toolbox : filterdesign, spectral analysis, waveform generation, linear prediction ? voicebox Matlab (Mathworks) ? pros: open, powerful, scripting, excellent plotting ? cons: poor speech munity, standards, not designed for big files 其它的語音分析工具？ ? Goldwave (audio editor) ? Esps Xwaves (routines + visual.) ? Praat (speech analysis) ? Wavesurfer (speech editor) ? Transcriber (annotation tool) ? OGI speech tools (routines + app. dev.) ? … winpitch, pitchworks, phonedit… .. Goldwave ? selfdefined as “top rated, professional digital audio editor” Goldwave ? pros : edition (good gestion of memory for big files), many FX, noise reduction, realtime spectrum and VU meters, various formats, batch conversion, chain effects, easy interface ? cons: nothing for speech (pitch, formant), windows only, no scrip
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