This article is also available in Russian / Эта статья также доступна на русском языке

The mass market of smartphones without the 3.5 mm audio jack changed headphones industry, wireless Bluetooth headphones have become the main way to listen to music and communicate in headset mode for many users.
Bluetooth device manufacturers rarely disclose detailed product specifications, and Bluetooth audio articles on the Internet are contradictory and sometimes incorrect. They do not tell about all the features, and often publish the same false information.
Let's try to understand the protocol, the capabilities of Bluetooth stacks, headphones and speakers, Bluetooth codecs for music and speech, find out what affects the quality of the transmitted audio and the delay, learn how to capture and decode information about supported codecs and other device features.

TL;DR:

• SBC codec is OK
• Headphones have their own per-codec equalizer and post processing configuration
• aptX is not as good as the advertisements say
• LDAC is a marketing fluff
• Voice audio quality is still low
• Browsers are able to execute audio encoders compiled to WebAssembly from C using emscripten, and they won't even lag.

Hello, dear Habr users! This article is about Web 3.0 — the decentralized Internet. Web 3.0 introduces the concept of decentralization as the foundation of the modern Internet. Many computer systems and networks require security and decentralization features to meet their needs. A distributed registry using blockchain technology provides efficient solutions for decentralization.

RUVDS and Habr continue the series of interviews with interesting people in IT field. Last time we talked to Richard «Levelord» Gray, level designer of popular games Duke Nukem, American McGee’s Alice, Heavy Metal F.A.K.K.2, SiN, Serious Sam, author of well-known «You’re not supposed to be here» phrase.

Today we welcome Randall Steward «Randy» Pitchford II, president, CEO and co-founder of Gearbox Software video game development company.

Randy started in 3D Realms where contributed to Duke Nukem 3D Atomic Edition and Shadow Warrior. Then he founded Gearbox Software and made Half-Life: Opposing Force, which won D.I.C.E in 2000. Other Gearbox titles include Half-Life: Blue Shift, Half-Life: Decay, Counter-Strike: Condition Zero, James Bond 007: Nightfire, Tony Hawk's Pro Skater 3, Halo: Combat Evolved and of course Borderlands.

The interview team also includes editor of Habr Nikolay Zemlyanskiy, Richard «Levelord» Gray, Randy’s wife Kristy Pitchford and Randy’s son Randy Jr.

We’re excited to announce the preview availability of the new Azure IoT Edge Tools Extension (Preview) for Visual Studio 2019. The extension provides a rich set of functionalities to support development of IoT Edge solutions with Visual Studio 2019:

The role of project management is becoming more and more relevant no matter in which area or industry it is implemented. In fact, it balances all project processes and steps and helps project teams meet their goals and objectives.

Project management helps to reach goals faster, cheaper and avoid risks thereby contributing greatly to business strategy execution. More companies cannot imagine their performance success without project management as one of the key business competencies. Since this competence is actively developing, professional project management software is also evolving with it in the same way.

The animation is at the heart of mobile app User experience (UX). Truth be told, energized changes quietly impart an assortment of messages and show the client the best way to explore through the mobile app by just coordinating the client's consideration.

For instance, liveliness can signify a connection between shared components. They can likewise be fundamental in demonstrating the progression between two states or direct the client's thoughtfulness regarding a suggestion to take action catch.

Such powerful development in mobile apps is dependably a utilitarian segment as opposed to adornments like structure components. Thus, movement in the UX configuration ought to be approached from the earliest starting point when the group designs the client's voyage.

At the point when the impact and ease of use of enlivened components are broken down during the QA testing stage, these changes can likewise be wiped out on the off chance that they neglect to convey a positive effect.

Vivified connections can make consistent cooperative energy between screens or realize a snapshot of progress. For instance, these activities can be any or the majority of the accompanying:

• Check the container
• Explore to another page
• Open settings
• Give framework status
• Communicate something specific

The above is only a glimpse of something larger. So as we quickly approach the finish of 2018, we should investigate the three most blazing mobile app movement inclines that are upgrading UX no matter how you look at it.

What is 3D printing?

3D printing is a new way of manufacturing solid objects based on the principle of discrete-stacking.
With the evolution of the trend, 3D printing has become a way to promote smart manufacturing, flexible manufacturing and green manufacturing. It can realize the integrated formation of complex structures that are difficult to process or even cannot be processed by traditional manufacturing technologies, greatly enhancing the process realization capability. Subversive advancement in equipment design and manufacturing.

From the past used to manufacture models, and now gradually realize the direct manufacturing of products, 3D printing manufacturing technology is developing towards the integration of “design-material-manufacturing”. According to research, the size of the world 3D printing market in 2017 was 3.86 billion US dollars. In 2018, the scale of China's 3D printing market was as high as 7.75 billion US dollars, which has more than doubled in two years. From behind the scenes to the forefront of the industry, the development of the 3D printing industry has moved from the concept introduction period to the rapid development period, all thanks to: "application." Members of the World 3D Printing Association have said:

“When 3D printing technology goes out of the lab,
Its development motivation lies in its application”

The San Juan Math, Science, and Technology center in Puerto Rico is using game-based learning to pave the way for a new level of engagement among their students. The institution is part of San Juan’s municipal education system and is recognized by Microsoft alongside a global community of other schools engaged in K-12 education transformation. The school decided to integrate Minecraft: Education Edition into their curriculum and have seen exciting results in STEM learning.

When I used to start a conversation about neural networks over a bottle of beer, people were casting glances at me of what seemed to be fear; they grew sad, sometimes with their eyelid twitching. In rare cases, they were even eager to take refuge under the table. Why? These networks are simple and instinctive, actually. Yes, believe me, they are! Just let me prove this is true!

Suppose there are two things I’m aware of about the girl: she looks pretty to my taste or not, and I have lots to talk about with her or I haven’t. True and false will be one and zero respectively. We’ll take similar principle for appearance. The question is: “What girl I’ll fall in love with, and why?”

We also can think it straight and uncompromisingly: “If she looks pretty and there’s plenty to talk about, then I will fall in love. If neither is true, then I quit”.

But what if I like the lady but there’s nothing to talk about with her? Or vice versa?

What is my advice for people who want to become game developers? After 25 years in the industry, I do have some advice to offer.

The Worlds Leading Real-time Messaging, Audio & Video Chat Solutions That Made Biggest Impact In 2019


With the growing trend of digitalization, most enterprises have transformed their communication methodology from mainstream to digital. In order to keep up with competitors, companies regularly upgrade their services, specially the way they relay information to their customers as well as their employees. Today, seamless real-time networking plays a critical role in engaging with individuals and enterprises, and the best way to implement such a feat is onboarding a Real-Time Chat, Voice & Video Calling SDK/API providers.

Hi guys,

Before you is an article guide to open data sets for machine learning. In it, I, for a start, will collect a selection of interesting and fresh (relatively) datasets. And as a bonus, at the end of the article, I will attach useful links on independent search of datasets.

Less words, more data.

A selection of datasets for machine learning:

• Data deaths and battles from the game of thrones — This data set combines three data sources, each based on information from a series of books.
• Global Terrorism Database — Over 180,000 terrorist attacks worldwide, 1970-2017.
• Bitcoin, historical data — Bitcoin data with an interval of 1 minute from selected exchanges, January 2012 — March 2019

This week I spent coding my very first public pet-app based on Telegram chat bot which acts as a Bitcoin wallet and allows to send and receive tips between Telegram users and other so-called “Lightning Apps”. I assume that you are familiar with Bitcoin & Telegram in general, i’ll try to post short and without deep jump into details. More resources about Bitcoin can be found here and Telegram is simply an instant messenger that allows you to create your custom apps (chat-bots) using their platform.

What are the key points of such app?

• Allows to rate other users ideas and answers with real value instead of
  ‘virtual likes’. This brings online conversation to completely new level
• Real example of working micro-payment app which can act with other entities
  over internet using open protocol
• All the modules are open-source projects and can be easy re-used and adjusted
  for your own project. App does not relay on third-party commercial services.
  Even it falls under e-commerce field, which is currently almost closed, the app
  is based on open solutions.

What are the use-cases?

something like this…

Introduction

In early March 2019, Intersoft Eurasia team completed work on a test batch of DO-RA gadgets — personal, cross-platform dosimeters-radiometers to monitor the radiation situation at the measurement site, compatible with iOS and Android smartphones and tablets.

By buying such a device, the user receives the following: reliable electronics which have undergone radiation testing in the factory laboratory, stylish colored case in the spirit of Malevich ;) for every taste, gift packaging, color insert instructions in Russian and English, special USB charging cable, a free updateable DO-RA.Pro application from the App Store and Google Play.

The next step in our project implementation is to find the best sales channels for Made in Russia products in the challenging environment of stagnant purchasing power.

(This is the translation of the original article performed by baragol)

We had a bunch of photographs of the main PCB, a YouTube video with drain-voltage waveforms of MOSFETs, a forum post with a breakdown of the capacitance values of LC circuit capacitors and also a number of unboxing videos showing the heating-up of the soldering tip. The only thing that really worried me was the video with the measurement of the peak power consumption during the heating-up. There is nothing in the world more helpless and irresponsible and depraved than burned cartridge newly bought for 60 bucks from Amazon. But let me start from the beginning.

App builders that are looking to achieve a greater level of success will often look to areas that have yet to be explored. Augmented reality and virtual reality are opening up whole new worlds to app builders. For example, there are a number of app builders who are already looking to the NBA in this regard.

The NBA has established a reputation for themselves as a progressive league from a technological standpoint. Teams are already participating in competitive gaming, as numerous franchises have created their own e-sports teams. Now, the league is partnering with app builders to find out more about how they can leverage augmented reality and virtual reality to their benefit.

In addition to quite a rich content Indeema delivers with regard to the various IoT topics, the present post aims at figuring out the venal or even down-to-earth aspect of a minimum viable product in the segment of the IoT. We mean the cost.

I would like to share main points of my Skolkovo application for Startup Village 2019 pitch.

Indibiome labs

Project Executive Summary indicating current developments and basic goals of the Project

Indibiome labs for kids are franchise network food labs providing safe environment where kids (13+) will learn how to analyse the food content and study influence of foods on health and will spread this knowledge through social networks, therefore educating other kids and adults in the field of healthy nutrition.



1. Transporting prototypes

The idea of the DO-RA project originated in March 2011 after a nuclear disaster on the Fukushima Daiichi nuclear power plant in Japan. This gadget was conceived as a personal dosimeter/radiometer working with eponymous software (DO-RA.Soft) on mobile platforms (iOS, Android, WP) as well as on desktop platforms—Windows/Linux/MacOS.

At the end of 2017, a tourist from China brought in his backpack ten long-awaited prototypes from the DO-RA.Q test batch. They were manufactured in China based on our design documents and then transported from Shenzhen to Moscow. By the way, the development of design documents was assigned to the largest Design Centre in Eastern Europe—the PROMWAD company. The documents were clear and plain—prepared in IPC format and written in proper English—to enable the automated production of electronic devices in a foreign country.

NodeMCU is an interactive firmware, which allows running Lua interpreter on the ESP8266 microcontroller (ESP32 support is in development). Alongside with all the regular hardware interfaces, it has WiFi module and SPIFFS file system.

This article describes the new module for the NodeMCU — sdm. SDM stands for simple driver model and it provides device-driver model abstraction for the system. In the first part of this article we will discuss the model itself and in the second part will be a showcase of dynamically created web user interface using sdm with some commentaries.