Book excerpt: This book details a number of electrocardiogram (ECG) denoising techniques based on total variation denoising and different wavelet transforms. The transforms covered include Lifting Wavelet Transform (LWT) and the Stationary Bionic Wavelet Transform (SBWT). The book includes three chapters that are wavelets and wavelet transforms, a denoising technique based on SBWT and WATV, and an ECG denoising technique based on LWT and TVM. The book is relevant to researchers, students, and academics in signal processing and biomedical engineering.