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Dialogic ADPCM - Wikipedia
https://en.wikipedia.org/wiki/Dialogic_ADPCM#:~:text=Dialogic%20ADPCM%20or%20VOX%20is%20an%20audio%20file,compression%20algorithm%2C%20optimized%20for%20voice%2C%20not%20high%20fidelity.
ADPCM Overview - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/xaudio2/adpcm-overview
ADPCM - Just Solve the File Format Problem
http://fileformats.archiveteam.org/wiki/ADPCM
ADPCM stands for Adaptive Differential Pulse Code Modulation, which is quite a mouthful. It is a method for encoding audio that improves on DPCM by adapting the step size of the quantization. The encoder keeps track of the current step size. The difference of consecutive input samples is linearly quantized as a multiple of the current step size.
Implementing the ADPCM algorithm in high-density ...
https://www.st.com/resource/en/application_note/cd00224093-implementing-the-adpcm-algorithm-in-highdensity-stm32f103xx-microcontrollers-stmicroelectronics.pdf
Audio format: PCM Audio sample size: 16 bits Channels: 1 (mono) Audio sample rate: from 8 kHz to 44.1 kHz Each 16-bit PCM sample is encoded into a 4-bit ADPCM sample, which gives a compression rate equal to ¼. The implementation of the IMA ADPCM algorithm consists in two functions, one that codes
ADPCM - Playing Clips from Sound Files
http://www.silogic.com/trains/ADPCM.html
Audio samples are 4bit ADPCM (i.e. 512 bytes = 1024 samples). All calculated offsets for audio records are in reference to the beginning of the audio data which is at 0x8000 in the .mth file. //1st audio record 0x0100: 01 // Frame (Start) 0x0101: 00 00 // Offset sample count into frame for start of audio data (16bit big endian)
Dialogic ADPCM - Wikipedia
https://en.wikipedia.org/wiki/Dialogic_ADPCM
Dialogic ADPCM or VOX is an audio file format, optimized for storing digitized voice data at a low sampling rate. VOX files are most commonly found in telephony applications, as well as an occasional arcade redemption game. [citation needed] It uses a lossy compression algorithm, optimized for voice, not high fidelity.
Open rif file - Rockwell ADPCM format
https://www.file-extensions.org/rif-file-extension-rockwell-adpcm-format
The rif file extension is associated with the ADPCM audio format developed by Rockwell. 2, 3, 4-bit ADPCM mono sound format. Frequency 7200 Hz. Most likely some old format without support. No further information could be found. This rif file type entry was marked as obsolete and no longer supported file format.
AU - Audio File Format - The Open Group
https://pubs.opengroup.org/external/auformat.html
The floating-point formats are signed, zero-centered, and normalized to the unit value ( -1.0 <= x <= 1.0 ). The sample_rate field contains the audio sampling rate, in samples per second. Common sample rates include 8000, 11025, 16000, 22050, 32000, 44100, and 48000 samples per second.
Audio File Formats for Phone Systems - HOLDCOM
https://www.holdcom.com/support/telephony-audio-file-formats/
A standard for ADPCM files was developed by Interactive Media Association in the form of the IMA ADPCM format. IMA ADPCM (.wav) 8 kHz, 4 bit would be the most commonly seen version of this file type. Occasionally, other containers such as .vox might be used with this encoder. Dialogic ADPCM
Stream and loop MS ADPCM (WAVE_FORMAT_ADPCM) - …
https://stackoverflow.com/questions/31029775/stream-and-loop-ms-adpcm-wave-format-adpcm
The file is encoded with ADPCMEncode.exe, this gives a WAV file with a format tag of WAVE_FORMAT_ADPCM. Like any stream, I create a IXAudio2SourceVoice (with the full ADPCMWAVEFORMAT from the start of the file) and feed it block-aligned buffers as it requests them. The data appears to be playing fine, until the time comes to loop.
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