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Adaptive differential pulse-code modulation - Wikipedia
https://en.wikipedia.org/wiki/Adaptive_differential_pulse-code_modulation#:~:text=An%20ADPCM%20algorithm%20is%20used%20to%20map%20a,techniques%20are%20used%20in%20voice%20over%20IP%20communications.
Implementing the ADPCM algorithm in STM32L1xx ...
https://www.st.com/resource/en/application_note/dm00109192-implementing-the-adpcm-algorithm-in-stm32l1xx-microcontrollers-stmicroelectronics.pdf
The IMA ADPCM compression algorithm encoder calculates a difference (d) between a 16-bit input linear sample (Sin) and a predicted linear sample (SL). The difference is quantized to a 4-bit compressed output sample (Sq) by using an adapted quantization step (q). This step is the same one as that used by the decoder. Figure 2 provides a flowchart of the ADPCM encoder. It also …
Design and Implementation of ADPCM Based Audio …
http://ipcsit.com/vol37/045-ICINT2012-I3213.pdf
2. ADPCM Algorithm The DVI Audio compression using ADPCM (ADPCM) algorithm was first described in an IMA recommendation on audio formats and conversion practices. ADPCM is a transformation that encodes 16-bit audio as 4 bits (a 4:1 compression ratio). In order to achieve this level of compression, the algorithm
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
1.2 ADPCM algorithm implementation The IMA ADPCM algorithm provided in this application note is used to encode audio files that have the following specification: 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.
Digital Audio Compression - Columbia University
https://www.ee.columbia.edu/~dpwe/papers/Pan93-acomp.pdf
Other ADPCM audio compression schemes include the CCITT Recommendation G.721 (32 kilobits per second compressed data rate) and Recommendation G.723 (24 kilobits per second compressed data rate) standards and the compact disc interactive audio compression algorithm.[7,8] The IMA ADPCM Algorithm. The IMA is a consor-
A Tutorial on MPEG/Audio Compression
https://web.media.mit.edu/~tristan/Classes/MAS.945/Papers/Technical/pan96tutorial.pdf
Differential Pulse Code Modulation (ADPCM) are relatively simple compression algorithms that can provide medium fidelity audio compression. To contrast the complexity of the MPEG/audio algorithm with that of some simpler, generic audio compression algorithms, the annex of this paper presents the details of µ-law and the ADPCM algorithm adopted by the Interactive …
Speech and Sound Compression and Decompression …
https://www.ti.com/lit/pdf/slaa361
Adaptive differential pulse code modulation (ADPCM) is a compression algorithm. Various ADPCM algorithms exist, all of which use differential codes and adaptation of the step-size of the quantizer. Section 2.1 describes differential pulse code modulation (DPCM), and Section 2.2 describes the IMA ADPCM algorithm, which is used in the associated code.
Recommended Practices for Enhancing Digital Audio ...
https://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf
mono 4-bit ADPCM DVI® algorithm m/s 8-bit Linear PCM Macintosh & MPC support 11.025 kHz m/s 4-bit ADPCM DVI® algorithm m/s 8-bit Linear PCM Macintosh & MPC support 22.05 kHz m/s 4-bit ADPCM DVI® algorithm m/s 16-bit Linear PCM (Least Significant Byte first) 44.10 kHz m/s 16-bit Linear PCM (Most Significant Byte first) m/s 4-bit ADPCM DVI® algorithm
Audio compression - SlideShare
https://www.slideshare.net/MadhawaKasun/audio-compression-23398426
Adaptive Differential PCM Audio Compression - AS2010377 17 • An ADPCM algorithm is used to map a series of 8 bit µ-law (or a-law) PCM samples into a series of 4 bit ADPCM samples. In this way, the capacity of the line is doubled. • Some ADPCM techniques are used in Voice over IP communications.
Simple Audio Compression Methods
https://users.ece.utexas.edu/~ryerraballi/MSB/pdfs/M4L4.pdf
(Uncompressed CD audio is 44,100 samples/sec * 16 bits/sample * 2 channels > 1.4 Mbits/sec) Compression factor ranging from 2.7 to 24. With Compression rate 6:1 (16 bits stereo sampled at 48 KHz is reduced to 256 kbits/sec) Under optimal listening conditions, expert listeners could not distinguish between coded and original audio clips.
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