Mohamed S Sabri

Title: Innovations of Mohamed S Sabri

Introduction

Mohamed S Sabri is a notable inventor based in Beaconsfield, CA. He has made significant contributions to the field of digital signal processing, particularly in video coding technologies. With a total of 2 patents, his work has had a considerable impact on the efficiency of video transmission.

Latest Patents

One of his latest patents is focused on two-channel coding of digital signals. This innovative video codec is designed to reduce the bandwidth required for storage and transmission of video signals. Typically, transmitting an uncoded quality color NTSC television signal in digitized form requires a channel bandwidth of 90-120 Mb/s for composite format and 216 Mb/s for component format. The proposed video codec achieves a remarkable reduction of the required transmission bandwidth by a factor of 2-3. This is accomplished by splitting the input signal into two channels: a main channel and a complementary channel. Different coding techniques are applied in each channel to optimize performance. In the main channel, the input signal is subsampled and DPCM encoded using fixed-rate companded quantization. Meanwhile, the complementary channel utilizes VWL and block coding to encode the interpolation error signal. This arrangement ensures high picture quality while being adaptable to various transmission rates and signal formats. In bandwidth-on-demand applications, the main channel can be used alone to provide a lesser quality signal, such as CATV quality at 35 Mb/s, which also reduces system complexity.

Another patent involves a method and apparatus for mitigating degradations caused by temporal filtering in a transmitted DPCM encoded video signal. This innovation conditions the signal in the receiver by applying the inverse temporal filtering function without the disadvantageous use of video frame memory.

Career Highlights

Mohamed S Sabri is currently associated with Northern Telecom Limited, where he continues to develop and refine his innovative technologies. His work has been instrumental in advancing the capabilities of video transmission systems.

Collaborations

Throughout his career, he has collaborated with notable colleagues such as Albert Golembiowski and Birendra Prasada. These collaborations have further enriched his contributions to the field.

Conclusion

In summary, Mohamed S Sabri is a distinguished inventor whose work in video coding and digital signal processing has led to significant advancements in the industry. His innovative patents reflect his commitment to improving video transmission technologies.