Maurizio Copperi

Title: Maurizio Copperi: Innovator in Speech Signal Processing

Introduction

Maurizio Copperi is a notable inventor based in Venaria, Italy. He has made significant contributions to the field of speech signal processing, holding a total of 5 patents. His work focuses on innovative methods for coding and decoding speech signals, which have applications in various telecommunications technologies.

Latest Patents

Copperi's latest patents include a "Method of and device for speech signal coding and decoding by parameter." This method involves filtering blocks of digital samples of speech signals using a linear-prediction inverse filter followed by a shaping filter. The coefficients for these filters are selected from a codebook of quantized filter coefficient vectors, resulting in a residual signal that is subdivided into vectors. Each vector is classified by an index based on the zero-crossing frequency and root mean square (r.m.s.) value. The process normalizes the vectors based on quantized values, ultimately forming excitation waveforms with minimized mean-square error.

Another significant patent is the "Method of and device for speech signal coding and decoding by subband." In this method, the digital speech signal is divided into subbands, with each subband coded independently. The first two subbands undergo adaptive linear prediction operations, while the third subband samples are quantized directly. The coded signal comprises indices for subband signal quantization levels, r.m.s. value quantization levels, and linear prediction filter coefficient vector indices.

Career Highlights

Maurizio Copperi is associated with Cselt-Centro Studi e Laboratori Telecomunicazioni S.p.a., where he has been instrumental in advancing telecommunications research. His innovative approaches to speech signal processing have positioned him as a key figure in the industry.

Collaborations

Copperi has collaborated with notable colleagues, including Daniele Sereno and Roberto Billi. Their combined expertise has contributed to the development of advanced technologies in speech signal processing.

Conclusion

Maurizio Copperi's contributions to speech signal processing through his patents and collaborations highlight his role as an influential inventor in the telecommunications field. His innovative methods continue to shape the future of communication technologies.