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Latest from Seewo Tech Circle

15 recent articles

Seewo Tech Circle

Sep 12, 2019 · Fundamentals

Understanding Speech Coding: Phonation Models and Linear Predictive Coding Explained

This article explains how speech codecs based on phonation models work, covering voiced and unvoiced sound generation, glottal pulse modeling, vocal tract and radiation models, and the linear predictive coding (LPC) technique used to reconstruct speech waveforms from acoustic parameters.

audio signal processinglinear predictive codingphonation model

0 likes · 7 min read

Understanding Speech Coding: Phonation Models and Linear Predictive Coding Explained

Seewo Tech Circle

Sep 10, 2019 · Fundamentals

Why G711 and MPEG‑1 Audio Codecs Compress Sound Efficiently

This article explores the acoustic foundations of audio compression, detailing how human perception models enable non‑uniform quantization in G711 (PCMA/PCMU) and how MPEG‑1 layer‑III (MP3) leverages frequency‑domain subband analysis, masking effects, and psychoacoustic thresholds to achieve high compression ratios without sacrificing perceived audio quality.

Audio CompressionG711MPEG-1

0 likes · 7 min read

Why G711 and MPEG‑1 Audio Codecs Compress Sound Efficiently

Seewo Tech Circle

Sep 3, 2019 · Fundamentals

Why C# Char '\x1d11e' Is Invalid and How Code Pages Influence Encoding

This article explains why a C# char literal like '\x1d11e' is illegal, how Unicode code points map to glyphs, the role of code pages on Windows and Linux, and practical tips to avoid encoding mishaps across different programming languages.

C++C++Java

0 likes · 8 min read

$Why C# Char '\x1d11e' Is Invalid and How Code Pages Influence Encoding$

Seewo Tech Circle

Aug 30, 2019 · Fundamentals

Demystifying Character Encoding: From ASCII to Unicode and Beyond

This article explains the fundamentals of character encoding, covering concepts such as information, symbols, character sets, various encoding schemes like ASCII, GB2312, UTF‑8, Unicode planes, common pitfalls, and practical examples to help developers avoid garbled text.

FundamentalsGB2312UTF-8

0 likes · 9 min read

Demystifying Character Encoding: From ASCII to Unicode and Beyond

Seewo Tech Circle

Aug 9, 2019 · Backend Development

Ensuring Reliable, Ordered, and Duplicate‑Free Messaging in IM Systems

This article explains the stringent reliability requirements of instant messaging—ordered delivery, low latency, no loss, and deduplication—analyzes causes of disorder such as multi‑process and multi‑thread architectures, and presents practical solutions including hash‑based routing, sequential IDs, push‑pull mechanisms, ACK optimization, and distributed ID generation.

DeduplicationInstant MessagingMessage Reliability

0 likes · 9 min read

Ensuring Reliable, Ordered, and Duplicate‑Free Messaging in IM Systems

Seewo Tech Circle

Aug 7, 2019 · Fundamentals

Mastering TCP: Avoid Sticky Packets, Implement Heartbeats, and Ensure Data Integrity

This article explains common TCP pitfalls such as sticky packets, how to handle them with proper framing, the importance of heartbeat mechanisms for detecting broken connections, and reliable data validation techniques like length prefixes and MD5 checksums to build robust network applications.

HeartbeatSocketSticky Packets

0 likes · 16 min read

Mastering TCP: Avoid Sticky Packets, Implement Heartbeats, and Ensure Data Integrity

Seewo Tech Circle

Aug 2, 2019 · Frontend Development

Master Frontend Component Architecture: From State Lifting to Scalable Containers

This article examines the challenges of component coupling and state sharing in growing frontend projects and proposes a clear container‑presentational component standard, outlining when to lift state, use a store, or rely on events.

Component ArchitectureFrontendState Management

0 likes · 6 min read

Master Frontend Component Architecture: From State Lifting to Scalable Containers

Seewo Tech Circle

Jul 30, 2019 · Frontend Development

Create Smooth Parabolic Drop Animations with Dynamic Blur in JavaScript

This article explains how to calculate object positions using a parabolic formula, generate multiple translucent shadows to simulate motion blur, and implement the entire effect with JavaScript, covering parameter selection, acceleration calculations, and practical code examples for smooth front‑end animations.

FrontendJavaScriptanimation

0 likes · 11 min read

Create Smooth Parabolic Drop Animations with Dynamic Blur in JavaScript

Seewo Tech Circle

Jul 26, 2019 · Frontend Development

WPF Rendering Explained: From OnRender to Screen

This article walks developers through the complete WPF rendering pipeline, detailing the three-layer architecture, message loop handling, Dispatcher processing, DirectX integration, and how drawing commands travel from OnRender to the screen, while providing code examples and references to deepen understanding.

DirectXDispatcherRendering

0 likes · 19 min read

WPF Rendering Explained: From OnRender to Screen

Seewo Tech Circle

Jul 10, 2019 · Fundamentals

Re‑engineering a Live Desktop App: How EasiNote Evolved Its Architecture

This article chronicles how a one‑person development team at Seewo built and continuously refactored their WPF‑based desktop suite—EasiShow, EasiMeeting, and EasiNote—by adopting MVVM, Prism, pre‑compilation, DAG startup, and other techniques to improve modularity and performance while the product kept evolving.

MVVMWPFnet

0 likes · 10 min read

Re‑engineering a Live Desktop App: How EasiNote Evolved Its Architecture