gmark@ihlpf.ATT.COM (Stewart) (04/24/88)
I am currently trying to convert sounds that a friend has playing on his Apple Macintosh to the format used by the UNIX-PC (3B1/7300) VoicePower board. The Mac has a program to convert the file to numeric form, and the result SEEMS to be PCM. The program seems to allow sampling rates of 11KHz and 22KHz, which I assume is higher than the sampling rate of the VoicePower board, which seems to be intended for answering-machine-type applications. I have written several programs to translate these files to and from decimal numbers to binary, remove each Nth sample, scale what I believe is the amplitude, and had fun but no success in translating. Anyway, conjecture aside, what I'm interested in is: ** What are the sound storage formats of the two systems: 1) PCM, linear or companded, and if so, 2) what formula? 3) what "word" size (a byte = an amplitude? 16 bits?) 4) any header or trailer information in the files that needs to be generated or preserved? 5) If it turns out that the best way is a direct audio hookup (LEAST desirable, as it is not in the least as much fun) what are the details on the audio I/O jacks on the two machines -- what's necessary? Any and all help/info./musings appreciated. - Mark G. Mark Stewart ATT-BTL, Naperville, ix1g266 ixlpq!gms 979-0914