Company Filing History:
10 out of 25,543 
1 out of 22 Years Active: 1993-1997
Title: The Innovations of Shuichi Yoshikawa
Introduction
Shuichi Yoshikawa is a prominent inventor based in Nara, Japan. He has made significant contributions to the field of signal processing, particularly in voice signal reproduction technologies. With a total of 11 patents to his name, Yoshikawa's work has had a lasting impact on the industry.
Latest Patents
Yoshikawa's latest patents include a signal reproducing device designed for reproducing voice signals from vector-quantized coded data. This device extracts coded data one by one and uses them as initial values in a recurrence equation to generate a pattern composed of a predetermined number of data for each initial value. The generated patterns are then sequentially output as reproduction data. Another notable patent is the DTMF signal judging apparatus, which includes a first power calculator and a second power calculator. The first calculator assesses the overall power of an input signal, while the second focuses on the power within the DTMF frequency band. The judging apparatus compares the outputs from both calculators to determine whether the input signal is a DTMF signal.
Career Highlights
Throughout his career, Yoshikawa has worked with notable companies, including Sharp Corporation. His innovative work has contributed to advancements in signal processing technologies, enhancing the quality and efficiency of voice signal reproduction.
Collaborations
Yoshikawa has collaborated with esteemed colleagues such as Yasumoto Murata and Yuji Nishiwaki. These partnerships have fostered a creative environment that has led to groundbreaking innovations in their respective fields.
Conclusion
Shuichi Yoshikawa's contributions to signal processing and voice signal reproduction are noteworthy. His patents reflect a deep understanding of technology and innovation, making him a significant figure in the industry.