--- Forwarded Message from John de Szendeffy <[log in to unmask]> --- >In-Reply-To: <[log in to unmask]> >References: <[log in to unmask]> >From: John de Szendeffy <[log in to unmask]> >Subject: Re: #8321 Creating MP3s >Date: Mon, 18 Sep 2006 09:36:41 -0400 >To: Language Learning and Technology International Information International Information <[log in to unmask]> On Sep 15, 2006, at 11:38 AM, [log in to unmask] wrote: > > Language study at the University of Chicago is moving (fairly > abruptly) > into digital delivery. I have captured audio from tapes as .wav files > (40 kHz, 16- or 24-bit). I want to convert these to mp3s files, but I > find that iTunes (which I am using right now) gives me three pre-set > options and then I can customize as I choose. Can anyone tell me what > perceptible differences they have noticed among these various options? > Good (128 kbps) and Higher (192) (both mono and 48 kHz) sound > basically > the same to me, with a 13 MB difference in size for the same material. > What would 320 kbps get me? (Is there anyone out there doing phonetic > analysis of language audio?) > > Barbara iTunes allows you to extensively customize the conversion of imported audio. Go to iTunes Preferences, choose Advanced and click on the Importing tab. You can customize the codecs for MP3, AAC, WAV and others. For digitized voice, such as textbook audio, we use MP3 encoding at a 48kbps mono bitrate and 22.050 kHz sample. To our ear, textbook audio thus encoded produces a very small file that is indistinguishable from 128kbps (or higher) stereo with a sample of 44.100 kHz. -John ___________________________________________ John de Szendeffy Multimedia Language Lab Center for English Language and Orientation Programs Boston University 890 Commonwealth Ave., 2nd floor Boston, MA 02215 USA ph 617.353.7957 fx 617.353.6195 lab http://www.bu.edu/celop/mll/ personal http://people.bu.edu/johndesz/ "A Practical Guide to Using Computers in Language Teaching" http://www.press.umich.edu/titleDetailDesc.do?id=97662 --------------------------- CELOP is accredited by the Commission on English Language Program Accreditation. Accreditation by CEA signifies that an English language program or institution has met nationally accepted standards of excellence and assures students and their sponsors that the English language instruction and related services will be of the highest quality. --------------------------- *********************************************** LLTI is a service of IALLT, the International Association for Language Learning (http://iallt.org/), and The Consortium for Language Teaching and Learning (http://www.languageconsortium.org/). Join IALLT at http://iallt.org. Otmar Foelsche, LLTI-Editor ([log in to unmask]) ***********************************************