Location History:
- London, EN (1976 - 1978)
- Ipswich, GB (1980 - 1991)
Company Filing History:
7 out of 159 
2 out of 1,874 
Years Active: 1976-1991
Title: The Innovations of John Mortimer Rollett
Introduction
John Mortimer Rollett is a notable inventor based in London, GB. He has made significant contributions to the field of technology, holding a total of 9 patents. His work primarily focuses on advancements in transmission systems and pattern recognition.
Latest Patents
One of Rollett's latest patents involves pattern recognition using stored n-tuple occurrence frequencies. This innovative transmission system describes a stereo coding method where 7 kHz bandwidth sum (L+R) and difference (L-R) signals are converted to digital form. The difference signal is bandlimited to 2 kHz and downsampled to 4K samples/sec before encoding. Both signals are multiplexed together for transmission. Upon reception, the signal is demultiplexed, and the difference signal is decoded and upsampled to its original bit rate. The sum signal is delayed in a digital buffer and decoded before being converted back to analogue form. This process ensures that the delay introduced by the digital buffer equalizes the excess delay in the difference signal.
Career Highlights
Throughout his career, Rollett has worked with prominent organizations such as the Post Office and British Telecommunications Public Limited Company. His experience in these companies has allowed him to develop and refine his innovative ideas.
Collaborations
Rollett has collaborated with notable individuals in his field, including Alan J Greaves and Phillip Ernest Greenaway. These partnerships have contributed to the advancement of his projects and patents.
Conclusion
John Mortimer Rollett's contributions to technology through his patents and collaborations highlight his innovative spirit and dedication to advancing the field. His work continues to influence the development of transmission systems and pattern recognition technologies.