An Overview: Comparative Analysis between CELP and ACELP Encoder for Wireless Communication

Abstract

Speech coding is categorized by way of the process of sinking the bit rate of digital Speech representation for
transmission or storage, while preserving a speech quality that is acceptable for the application [2]. Speech coding is an
important feature of modern telecommunications. The primary impartial of speech coding is to represent the speech signal
with the least number of bits, while keeping a satisfactory level of quality of the retrieved or synthesized speech with
reasonable computational complexity [9].To attain great quality speech at a little bit rate, coding algorithms put on
sophisticated methods to reduce the redundancies, that means to eliminate the irrelevant information from the speech signal.
In addition, a lower bit rate suggests that a lesser bandwidth is required for transmission [10]. Code excited linear
prediction and algebraic code excited linear prediction speech coding techniques useful in wireless communication for
compression of speech signal to improve the data rate. The CELP coding operated under 8kbps exploited to transmit the
minimum amount of speech signal in Codeword with minimum error is formed to synthesis the speech signal.In ACELP coder
the speech signal transmit with minimum 4kbps speed so we have to reduce the bit rate more & more compare to CELP
coder.