Audio Compression Techniques
a type of lossy or lossless compression in which the amount of data in a recorded waveform is reduced to differing extents for transmission respectively with or without some loss of quality, used in CD and MP3 encoding, Internet radio.
Dynamic range compression, also called audio level compression, in which the dynamic range, the difference between loud and quiet, of an audio waveform is reduced
Intro to Compression: Audio and Video Optimization for LearningNick Floro
Learn how to compress audio and video for delivery to desktop and mobile devices today. Learn how to use HTML5 and Flash as well as best practices from editing, compression and delivery of content.
Design in Motion: Video Production Workflowgoodfriday
Creating high quality video is a combination of art and science. Learn the tips from the pros on how to optimize video compression to deliver the best quality at the smallest sizes with Expression Media Encoder, a feature of Microsoft Expression Media.
In this presentation, production of digital audio is discussed. Also brief introduction about digital audio broadcast, recording techniques and stereo phony is given.
Audio Compression Techniques
a type of lossy or lossless compression in which the amount of data in a recorded waveform is reduced to differing extents for transmission respectively with or without some loss of quality, used in CD and MP3 encoding, Internet radio.
Dynamic range compression, also called audio level compression, in which the dynamic range, the difference between loud and quiet, of an audio waveform is reduced
Intro to Compression: Audio and Video Optimization for LearningNick Floro
Learn how to compress audio and video for delivery to desktop and mobile devices today. Learn how to use HTML5 and Flash as well as best practices from editing, compression and delivery of content.
Design in Motion: Video Production Workflowgoodfriday
Creating high quality video is a combination of art and science. Learn the tips from the pros on how to optimize video compression to deliver the best quality at the smallest sizes with Expression Media Encoder, a feature of Microsoft Expression Media.
In this presentation, production of digital audio is discussed. Also brief introduction about digital audio broadcast, recording techniques and stereo phony is given.
Audio Essentials for Broadcast and MultiscreenEllis Reid
This wall chart highlights the key terms and standards required for the delivery of premium audio across broadcast and multiscreen workflows. It is designed as a quick reference for people who are responsible for delivering rich media experiences acress broadcast and over the top networks
What’s audio bitrate? What are the supported, recommended, common, maximum, and minimum audio bitrates of different environments? How to convert audio bitrate?
Latest manual of AQuA - Audio Quality Analyzer, a tool for end-to-end voice quality analysis and scoring. AQuA is a competitive technology for POLQA and ViSQOL.
QualTest mobile test probe for VoIP and mobile call testing and monitoringSevana Oü
Sevana QualTest is a mobile test probe application that checks
current network conditions and estimates voice quality in mobile and VoIP networks
The platform is designed for end-to-end and single-end call testing, as well as for gathering and analyzing call audio quality metrics. Measure network metrics for VoIP calls and use waveform analysis to correlate audio problems with network conditions.
Real-time monitoring of 5G network. Reliable MOS and other KPIs for messenger-to-messenger and voice calls. Automated mobile-to-mobile testing in 5G networks. Flexible integration and drive testing.
Powerful tool to #analyze voice #streams recorded in PCAP files. On top of network metrics and standard E-model MOS one receives waveform analysis of all the audio streams and metrics related to reasons for audio quality degradation.
Administration manual for Sevana Voice Quality Monitoring solution based on Asterisk PBX. This solutions makes end-to-end voice quality testing and monitoring easy. Various test scenarios for echo or conference birdge testing are already included. AQuA and PVQA impairments analysis together with full VoIP statistics make it suitable for use in any type of network.
Integrate QualTest GSM with desktop or Raspberry Pi. Application receives notification from QualTest test probes about call events, copies recorded calls to desktop, limits time of call, runs pvqa and aqua utilities to estimate voice quality.
Hardware requirements.
QualTest GSM is an Android application that turns your mobile phone into mobile test probe that can make mobile-to-mobile test calls returing AQuA and PVQA call quality metrics including MOS score and audio impairments information.
Sevana QualTest suit is a set of applications to fully automate mobile to mobile call quality testing for rooted and non-rooted mobile phones. Schedule tests and let the system run them using ADB commands directly from your phone, make test call, analyze call audio quality, pack test results in JSON report and deliver to the backend selected.
Real time call quality analysis for mobile operatorsSevana Oü
Real waveform analysis for mobile service and solution providers to easily enable:
- Silent call detection
- Audio impairments patterns analysis
- Problem root cause detection
- Fraud detection
- Customized RTP stream interaction
Sevana QualTest is a mobile test probe application which checks current network conditions and estimates voice quality in mobile networks. QualTest is a mobile application for Android
powered devices that can work in both VoIP and cellular networks.
Powerful tool to non-intrusively evaluate
voice quality. Quick and easy setup up of single-ended
voice quality testing. Objective MOS score prediction. Call quality impairments detection.
Sevana PVQA Server is a multipurpose tool for call quality analysis. One can use it as core of their quality analysis and monitoring system to detect and investigate QoE and QoS related issues. PVQA server combines the force of audio waveform analysis using PVQA technology with continuous network monitoring.
Sevana AQuA - Your powerful tool for perceptual voice and audio quality analysis:
• Quick and easy setup up of end-to-end voice quality testing
• Reliable objective MOS score
• Comprehensive waveform analysis
This presentation describe use of Sevana AQuA for end-to-end drive testing in mobile networks. Compares AQuA with PESQ and POLQA feature and provides information on how Sevana passive voice quality waveform analysis (PVQA) can detect voice quality impairments and their patterns that can be used to ease root cause analysis of quality issues.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
State of ICS and IoT Cyber Threat Landscape Report 2024 preview
Ogg vorbis compression optimization
1. AQuA Music
AQuA is the tool that will help you to save up to 40% on bitrate and
up to 50% on audio size when encoding your audio files!
AQuA for music quality testing is basically the same AQuA Wideband
product, which is devoted to perceptual testing of audio signal quality.
When considering digital recording and digital playback, sound quality
depends on the range of sound signal, the rate at which it is sampled,
and various conversions that occur in sound reproduction system.
In lossy codecs like MP3, sound quality is a factor that determines
how much of the sound signal data the encoder is allowed to loose
in order to reduce file size. In MP3-encoded signals for instance the
quality is defined by its bitrate, in kilobits per second (kbps).
The frequency range of sound (in Hertz) which equipment is capable
to sample and reproduce affects sound quality. Humans can hear
frequencies ranging from about 20 Hz to approximately 20 kHz, so
sampling that does not extend far enough will take effect on the
sound quality.
Sound signal wave is continuous and has some real value at every
instant. The digital quantization of the analogue sound wave means
that much of the continuous sound wave is not recorded. The rate
at which the sound is sampled refers to the amount of information
the detection equipment records for each second of the sound. The
higher the sampling frequency, the more accurate the final samples
will be. However, there is a mathematical proof that in order to
preserve all frequencies in the original sound it's enough that the
sampling frequency is two times higher than the highest frequency
in the sound signal spectrum. Thus for example when dealing with
speech one can easily use sampling frequency of 8kHz, because
human speech spectrum is limited by 4kHz and telephone channel
spectrum by 3.4kHz.
When recording a podcast, grabbing music from your CD into MP3,
2. OGG or AAC, uploading an audio book to your iPhone or dumping
your favorite tracks on a memory stick to play while driving, we
always face the same problem - we want to make the file smaller
but sound as good as ithe original. In many cases when one usess
MP3 encoder the choice he or she makes is simple - to use 320kbps
and that will surely preserve the quality. In many cases it may work,
but what if you store thousands of tracks? What if millions? What
if you are going to transmit your podcast over the Internet? What
if your audio is transmitted over a mobile network? In such cases
every megabyte saved turns into real money saving and the lower
the bitrate preserving desired audio quality the better performance of
your service.
The way it works is very simple. AQuA has a perceptual audio quality
model that acts as a very well trained human ear that can hear even
tiny changes in audio quality and tell how much quality was lost due
to audio processing. AQuA returns two types of scores:
- percentage of quality similarity compared to the original audio
- MOS (Mean Opinion Score), which is a value between 1 and 5
MOS Quality Impairment
5 Excellent Imperceptible
4 Good Perceptible but not annoying
3 Fair Slightly annoying
2 Poor Annoying
1 Bad Very annoying
So, the process of choosing the best audio compression parameters
(OGG, MP3, AAC compression optimization) when optimizing f.e.
bitrate with Lame MP3 encoder is split into the following phases:
1. set minimal bitrate = X
2. set bitrate incremental step = S
3. compress original audio into MP3 with bitrate X
4. decompress MP3 into uncompressed WAV
5. test quality comparing original WAV and uncompressed MP3 using
AQuA Wideband
6. if the quality is lower than MOS 5 increase bitrate so that new
3. bitrate = X + S and go to step 3
7. if the quality is higher or equals MOS 5 then we have found optimal
bitrate for this audio
Let's use MP3_Torture_Test.wav taken from this location: http://
recording.org/daw-pro-audio/28203-mp3-encoder-torture-test.html
We are going to use mp3opt.bat file to automate bitrate optimization
and the result we get is:
"% = 97.59"
"MOS = 5.00"
"Bitrate = 104"
"Passes=13"
So, we preserve 97.59% of original file quality if encode
MP3_Torture_Test.wav using Lame encoder with the following
parameters:
lame.exe -b 104 MP3_Torture_Test.wav MP3_Torture_Test.wav.mp3
In the post where we took the MP3_Torture_Test.wav from 128kbps
gives a very good quality according to the poster, but we could save
24kbps on bandwidth and about 400K on the file size!
lame.exe -b 128 MP3_Torture_Test.wav MP3_Torture_Test-
128kbps.wav.mp3
WAV 15882228 Bytes Bytes Ratio
128kbps 1441122 11
104kbps 1080842 15
Now it's time to check how much quality was preserved in the audio
compressed with 128kbps, so we use AQuA again:
aqua-wb tst.lic -mode files -src file MP3_Torture_Test.wav -tstf
MP3_Torture_Test-128kbps.wav -acr auto -npnt auto -miter 1 -enorm
on -grad on -mprio on -tmc on -ratem %m
4. Here is the output:
Sevana Audio Quality Analyzer - AQuA-Wideband v.5.3.11.720.
Copyright (c) 2009 by Sevana Oy, Finland. All rights reserved.
---------------------------------------------------------------
test license
---------------------------------------------------------------
File Quality is
Percent value 97.52
MOS value 5.00
Amazingly, but the quality is the same as at 104kbps! And if it sounds
the same (you are welcome to download these files and listen to
them yourself) why to spend extra space and bandwidth?
And now another application of AQuA Wideband – audio transcoding.
Let's compress MP3_Torture_Test.wav using Lame with 320kbps
keeping in mind that this is a typical choice of those who want to
preserve maximum of quality.
AQuA shows us that at 320kbps we preserved
aqua-wb tst.lic -mode files -src file MP3_Torture_Test.wav -tstf
MP3_Torture_Test_320kbps_mp3.wav -acr auto -npnt auto -miter 1 -
enorm on -grad on -mprio on -tmc on -ratem %m
Sevana Audio Quality Analyzer - AQuA-Wideband v.5.3.11.720.
Copyright (c) 2009 by Sevana Oy, Finland. All rights reserved.
---------------------------------------------------------------
test license
---------------------------------------------------------------
File Quality is
Percent value 99.50
MOS value 5.00
almost 100% of audio quality. Let's now transcode this audio file and
check what lowest bitrate we can use and how much quality we'll
preseve from 99.5%
5. "% = 97.53"
"MOS = 5.00"
"Bitrate = 104"
"Passes=13"
And we got a pretty much the same result from tanscoding. Of
course when dealing with uncompressed original audio we have a
better chance to avoid compression artifacts, but still it is possible to
transcode with a lower bitrate and audibly the same quality. Of course
compared to the original uncompressed audio we may get a different
result:
Sevana Audio Quality Analyzer - AQuA-Wideband v.5.3.11.720.
Copyright (c) 2009 by Sevana Oy, Finland. All rights reserved.
---------------------------------------------------------------
Valeri, test license
---------------------------------------------------------------
File Quality is
Percent value 97.41
MOS value 5.00
But it is still of a high quality level.
WAV 15882228 Bytes Bytes Ratio
320kbps 3602807 4.4
104kbps 1081469 15
After transcoding we saved 216kbps bandwidth and 70% of space!
What's in it for me?
Private customer (AQuA service) Corporate customer (AQuA Server)
Optimized audio CD grabbing Tremendous space saving on large
audio files
6. Increased storage on MP3 player, Space and bandwidth saving on
iPod and mobile devices podcasts, tunes, audio books hosting
and streaming
More audiobooks to fit the same Optimized audio for transmission
storage over communication channels
More tracks to fit the same Bandwidth saving on mobile network
memory stick audio streaming
Automated audio encoding with user
defined quality level
Optimize bitrate for Internet radio
broadcasting