G.728 LD-CELP vocoder
G.728 LD-CELP Vocoder
GAO's G.728 vocoder implements the low delay code-excited linear prediction (LD-CELP) speech compression technique specified in the ITU-T standard and provides approximately 4 kHz of speech bandwidth. The software encodes 5 sample frames of 16-bit linear PCM data into 10-bit code words. GAO's G.728 software employs backward-adaptive linear predictive coding analysis to achieve a low transcoding delay. Applications for GAO G.728 include digital circuit multiplication equipment, videoconferencing, digital telephony, and multimedia products.
The ITU-T G.728 standard specifies the encoding of 8 kHz sampled speech signals for transmission over a 16 Kbps channel. This recommendation contains the description of an algorithm for the coding of speech signals at 16 Kbps using low-delay code excited linear prediction (LD-CELP).
Features of G.728 Vocoder
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Operates at 16 Kbps.
Adaptive post filter enhances performance for multiple transcodings.(VAD).
User-selectable procesing frame size.
2 ms transcoding delay.
For a complete list of GAO's Speech Vocoders Software products, please see GAO's Speech Vocoders List.
G.728 Product Sheet Printable PDF Version
