This inventor holds 1 USPTO granted patent and 1 published patent application. Top assignee: Industrial Technology Research Institute. Active years: 2000.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
Years Active: 2000
Title: Wen-Whei Chang and Bark-Spectrum Vocoder Innovation.
Introduction
Wen-Whei Chang is an inventor associated with Taoyuan, Taiwan, and the Industrial Technology Research Institute. Her work includes a patent for a low-bit-rate sinusoidal transform vocoder designed to encode speech with high audio quality.
Latest Patents
Chang’s listed patent is “Method of Amplitude Coding for Low Bit Rate Sinusoidal Transform Vocoder.” The invention transforms harmonic sine waves from a frequency spectrum into a perception-based Bark spectrum. It applies equal-loudness pre-emphasis and converts loudness into subjective loudness, which is quantized using pulse code modulation. During synthesis, the Bark spectrum is inversely processed to produce an excitation pattern, from which sine-wave amplitudes are estimated by treating amplitudes within the same critical band as equal. Chang is credited with 1 patent in the information provided.
Career Highlights
The patent addresses efficient speech coding by combining perceptual frequency analysis with quantization techniques. Its approach aims to achieve a low coding bit rate while maintaining high-quality audio. Chang is associated with the Industrial Technology Research Institute.
Collaborations
The listed coworkers are Hwai-Tsu Chang and Huang-Lin Yang. The available information identifies them as coworkers but does not specify their roles in the patent.
Conclusion
Wen-Whei Chang’s listed invention applies Bark-spectrum processing and amplitude coding to support efficient, high-quality speech transmission.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile