LINEAR PREDICTIVE CODING
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 2015, Vol 4, Issue 4
Abstract
Linear predictive coding (LPC) is defined as a digital method for encoding an analog signal in which a particular value is predicted by a linear function of the past values of the signal. It was first proposed as a method for encoding human speech by the United States Department of Defense in federal standard 1015, published in 1984. Human speech is produced in the vocal tract which can be approximated as a variable diameter tube. The linear predictive coding (LPC) model is based on a mathematical approximation of the vocal tract represented by this tube of a varying diameter. At a Particular time, t, the speech sample s(t) is represented as a linear sum of the p previous samples. The most important aspect of LPC is the linear predictive filter which allows the value of the next sample to be determined by a linear combination of previous samples. Under normal circumstances, speech is sampled at 8000 samples/second with 8 bits used to represent each sample. This provides a rate of 64000 bits/second. Linear predictive coding reduces this to 2400 bits/second. At this reduced rate the speech has a distinctive synthetic sound and there is a noticeable loss of quality. However, the speech is still audible and it can still be easily understood. Since there is information loss in linear predictive coding, it is a lossy form of compression.
Authors and Affiliations
Mohit Narayanbhai Raja , Priyanka Richhpal Jangid, , Dr. Sanjay M. Gulhane
Keywords
Related Articles
- EP ID EP158472
- DOI -
- Views 96
- Downloads 0
INTRODUCTION OF FINGERPRINT BIOMETRIC TECHNOLOGY IN NIGERIA BANKING SYSTEM: A KNOWLEDGE-BASED SECURITY PERSPECTIVE
Web-based and cash-point/automated teller machine (ATM) fraud has become a common occurrence where third parties gain unauthorized access to customer’s fund. A Knowledge management (KM) transformation principles,...
WATER QUALITY ANALYSIS AND SIMULATION OF PANCHAGANGA RIVER USING MATLAB
Panchaganga River is now facing serious problem of pollution and in present situation continuous analysis is needed to control pollution of Panchaganga River. Pollution of Panchaganga River is observed because of d...
A STUDY ON NETWORK SECURITY TECHNIQUES
Internet plays a vital role in our day today life. Data security in web application has become very crucial. The usage of internet becomes more and more in recent years. Through internet the information’s can be s...
ASSESSMENT OF POWER POTENTIAL FROM CAJAN PEA AND PEANUT BIOMASS AND MIXED OF COAL & BIOMASS
Due to high energy potential and less pollutants, power generation from biomass is becoming an attractive way for energy generation. In the present work briquette of coal and biomass is prepared for power generati...
ONTOLOGY BASED ASPECT LEVEL OPINION MINING
In recent years, opinion mining has been investigated mainly in three level of granularity (document, sentence or aspect(feature)). However both document and sentence level analysis do not discover what exactly customers...