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Compression of speech signal is an important field in digital signal processing. Because of limited bandwidth in many fields especially in the field of military speech compression has a significant importance in the present world. The other reasons for speech compression are limited transmission and storage capacity. The process of converting human speech signals into encoded representation then converting back into original signal by decoding back to produce a close approximation of the original signal. This paper presents a speech compression by designing a low bit rate Vocoder board. The process includes component selection for doing schematic followed by PCB design. The final board is tested by giving speech input of different languages and then calculating PESQ of both input and compressed speech.

“Development of vocoder board for speech compression at three different rates”