MELPe - Mixed-Excitation Linear Predictive enhanced

ADT MELPe C54x

SPEECH CODER

Adaptive Digital's enhanced-MELP (MELPe) is a low bit rate vocoder supporting 2400 and 1200 bps. It can operate at half the rate of the MELP standard.

Enhancements include: Improved encoding/decoding, transcoding between 2400 and 1200 bps bit streams, and noise preprocessing for removing background noise.

MELPe provides better quality than all older military standards, especially in noisy environments such as battlefield, vehicles and aircraft. MELPe is suitable for use by OEM customers for VoIP, telecom, military, secure voice & radio, and other low bit-rate compressed speech applications.

Data sheet: .pdf

Coding Rate: 2.4, 1.2 kbps

Sampling Rate: 8 kHz

FEATURES

Functions are C-callable
Multiple channel capable

AVAILABILITY

ADT MELPe is available on the TMS320™ DSP Family

C54x™ DSP Generation

SPECIFICATIONS

MELPe C54x

All Memory usage is given in units of 16 bit word.

Function	MIPS	Program Memory	Data Memory
Encode	20.75	-	-
Decode	17.4	-	-
Encode + Decode	38.15	12997	16245
Noise Preprocessor (NPP)	19.59	4376	9534

Last update: 05/17/2006

FUNCTION

InitializeMelpEncoderChannel (. . .) Initializes the MELPe encoder

InitializeMelpDecoderChannel (. . .) Initializes the MELPe decoder

EncodeMelp (. . .) Executes the MELPe encoder

DecodeMelp (. . .) Executes the MELPe decoder

APPLICATIONS

Military communications requiring a lower bit rate, used in narrow band channels.