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Audio Codecs Explained for Non-Audiophiles | Audioholics
https://www.audioholics.com/audio-technologies/codecs
The most common values for sample rate are 44.1kHz (most common for music CDs), and 48kHz (most common for audio tracks in movies). Sample depth: The second most important variable affecting audio resolution is sample depth. Also known as sample size or sample precision, it refers to the quality of a sample.
Quality Measurement of Perceptual Audio Codecs | …
https://link.springer.com/chapter/10.1007/978-1-4615-0327-9_10
While audio quality is a fundamental concept in audio coding, it remains very difficult to describe it in objective terms.
FLAC7.1 Implementation and Audio Quality …
https://www.nxp.com/docs/en/application-note/AN13291.pdf
to measure the audio quality after audio card's adc processing, perform the following steps: 1.apx525’s analog output 1 and analog output 2 connect to cs42448 audio card’s stereo input1 and stereo input2. 2.cs42448 audio card’s sai interface (mclk, adc_lrclk, adc_sclk, adc_sdout1, adc _sdout2) connect to apx525’s digital serial i/o (mclk, lrclk, …
Video Codec Testing and Quality Measurement
https://netvc.github.io/testing/
1. Introduction 2. Subjective quality tests 2.1. Still Image Pair Comparison 2.2. Video Pair Comparison 2.3. Subjective viewing test 3. Objective Metrics 3.1. Overall PSNR 3.2. Frame-averaged PSNR 3.3. PSNR-HVS-M 3.4. SSIM 3.5. Multi-Scale SSIM 3.6. Fast Multi-Scale SSIM 3.7. CIEDE2000 3.8. VMAF 4. Comparing and Interpreting Results 4.1. Graphing
The reference for audio quality - SoundExpert
Such measurements: • correlate well to human perception of sound quality • are valid for digital audio • do not contradict traditional audio metric but extend it • are understandable to people without technical background • can be performed at home using any recording device
AUDio MEasurement System download | SourceForge.net
https://sourceforge.net/projects/audmes/
AUDio MEasurement System - multi-platfrom system for audio measurement through sound card in the PC. Incorporates generator, oscilloscope, audio spectrum analyzer (FFT) and frequency sweep characteristic. Now it can be compiled and works under Linux, Windows and MacOS. Features Display audio spectrum (FFT) Show wave form Generate tones
1 Voice over LTE (VoLTE) Speech Quality Measurements ...
https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_application/application_notes/1ma204/1MA204_9e.pdf
1 Voice over LTE (VoLTE) Speech Quality Measurements Application Note Products: ıR&S®CMW500 ıR&S®CMWrun ıR&S®UPV ı R&S®UPV66 This application note and associated application software may be used to conduct psychoacoustic speech quality evaluation for Voice over LTE (VoLTE) connections.
Why not use audio codec chip as measurement ADC/DAC?
https://electronics.stackexchange.com/questions/139325/why-not-use-audio-codec-chip-as-measurement-adc-dac
Audio codecs are very linear and very low noise, but they are usually AC-coupled to eliminate DC offsets, and their absolute accuracy (scale factor) is not very tightly controlled, since these aspects are not as important in audio work. This makes them less suitable for general ADC/DAC applications.
VoIP Codecs Explained - How to Improve Call Audio Quality
https://telnyx.com/resources/codecs-affect-voip-sound-quality
The G.711 codec offers some of the best sound quality. However, it also requires the most bandwidth. This codec requires at least 96Kbps of bandwidth per line. If you want slightly better audio quality, you can use this codec with less compression. But that will require 112Kbps or 128Kbps of bandwidth per line.
perceptual voice perceptual audio quality test - OPTICOM
https://www.opticom.de/technology/peaq.php
The ODG indicates the measured basic audio quality of the signal under test on a continuous scale from -4 (very annoying impairment) to 0 (imperceptible impairment). Besides the ODG the model outputs a complementary quality value – the Distortion Index (DI).
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