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Abstract
Low bit rate digital transmission of speech signals continues to hold the attention of engineers and scientists working in the area of communications. This paper examines the basic issues involved in band-width compression techniques. The maximum information rate in speech signals has been reviewed and an upper limit for low bit rate digitization arrived at. Some of the existing low bit rate speech digitization systems are reviewed and discussed.
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Notes on contributors
K.D. Pavate
Pavate (K D) was born in Benaras (UP) in 1930. He studied Physics at Fergusson College, Poona, the Institute of Science, Bombay, and the Cambridge University (UK). He later worked for 2½ years in the research laboratories of Associated Electrical Industries (now GEC) in Manchester. He joined CEERI in 1957 as a Junior Scientific Officer and is currently Scientist ‘F’ and Incharge of the CEERI Extention Centre in New Delhi. His areas of interest include Electroacoustics, Speech Communication and Audio Visual Systems.
K.V. Ramakrishnan
Ramakrishnan (K V) Dr. was born in 1939. He graduated from Fergusson College, Poona University in 1959 and did his Postgraduation in Physics at Poona University in 1961. He joined CEERI in 1962 as a Senior Scientific Assistant. He was deputed to ENSEEIHT (Toulouse) France for advanced training in Digital Electronics. He obtained his Doctorate from University Paul Sabatier, Toulouse in 1972. He is currently working as Scientist ‘E’ at CEERI Extension Centre in Delhi. His areas of interest include Speech Communication, Speech Signal Processing, Digital Electronics and Microprocessor Applications in Speech.