Implementation of Speech Companding Technique in Blackfin Digital Signal Processor for Digital Telephone Systems
| Main Authors: | T. Veeramanikandasamy, M. Venkatachalam |
|---|---|
| Format: | Article eJournal |
| Bahasa: | eng |
| Terbitan: |
, 2019
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3543628 |
Daftar Isi:
- The companding is a Pulse Code Modulation technique which can be effectively used in different applications, especially in digital telephone systems. A digital telephone system gets an analog speech input signal and it is converted into a digital signal usually it is considered as a linear signal. In order to reduce the transmission bandwidth, the signal is compressed before transmission which would become a non-linear signal. The non-linear digital signal is converted back to a linear digital signal in digital reception. The international standard A-law (G.711) is a speech companding technique, to compress 13-bits linear PCM data down to 8-bits of logarithmic data and expands 8-bits of logarithmic data back to 13-bits linear PCM data that allowing for a bit rate of 64 kbps. This A-law companding technique is implemented by using ADSP BF533 processor which is an enhanced member of the Analog Device Blackfin family that offers significantly higher performance in lower power for new product development.