BreakingNews.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz I wanted to convert it to this format: BreakingNews.wav: RIFF (little-endian) data, WAVE audio, ITU G.711 A-law, mono 8000 Hz
This drove the audio format for a lot of early audio-capable DOS applications and games. The original Sound Blaster could only play mono, unsigned 8-bit PCM data. Later Sound Blaster cards were capable of playing back 16-bit audio data. However, while these cards still played unsigned 8-bit PCM data, 16-bit data needed be signed.
avconv -i input.mp4 -ar 8000 -acodec pcm_u8 -ac 1 output.wav. WAV is the container format for the PCM codec so if you MUST have PCM then get into a binary file editor (wxHexEditor is a nice one) and delete the first 44 bytes (its header) of that WAV file. So above gives you 8000 samples per second and a bit depth of 8 bits, and mono.
Following a reboot, the IP Office will try using TFTP to download a file called holdmusic.wav. The file properties should be: PCM, 8kHz 16-bit, mono, maximum length 30 seconds. The initial source for download is the system's configured TFTP server (System | System | TFTP Server IP Address).
This page will show how to convert your sound file(s) into PCM 16-bit Mono WAV files at 22KHz sample rate, which is usually best for the current crop of microcontrollers which take WAV files and play them on a speaker. Currently, we are recommending two ways to convert the files: via use of the program Audacity or via iTunes.
8 bit export is not an option with above (Audacity 2.03, snow leopard latest updates, even java working). (Recorded in mono, 44.1 16 bit pcm sampling, 8000 in project window bottom left corner, export, other uncompressed formats, microsoft wav and U-law selected) . U-Law and A-Law are 8-bit formats, as explained in the Manual.
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convert mp3 to pcm 8khz 16 bit mono
