MELPe - enhanced Mixed-Excitation Linear Predictive

enhanced-MELP Federal Standard, is a low bit rate vocoder supporting 2400, 1200 and 600 bps.

Enhancements include: Noise preprocessing for removing background noise.

AVAILABILITY

ADT MELPe is available on the following Platforms: Other configurations are available upon request.

Product Number	Platform
ADT_melp-e_c64x	TI TMS320C64x
ADT_melp-e_c64xp	TI TMS320C64x+
ADT_melp-e_c6416	TI TMS320C6416
ADT_melp-e_c674	OMAP

FRAME SIZE

The Melpe coder frame size is dependent on the Encode/Decode rate

Rate	Frame Size (Samples)	Frame Size (msec.)
600 bps	720	90 .0
1200 bps	540	67.5
2400 bps	180	22.5

SPECIFICATIONS

Note: All CPU usage given in MIPS (also known as MCPS or MHz)

TI TMS320C6000

MELPe C64x

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

C64	Program	Channel	Scratch	Tables	Data
Encoder	188.4k	6560	5672	148k	63k
Decoder		1376
NPP		11968

MELPe C64x +

MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

C64+	Program	Channel	Scratch	Tables	Data
Encoder	191k	6560	6984	163k	70k
Decoder		1376
NPP		11968

MELPe C6416

CPU UTILIZATION

MIPS (C6416)	MIPS (600bps)	MIPS (1200 bps)	MIPS (2400 bps)
Nonlinear Preprocessor (NPP)	12.2	12.2	13.3
Encoder	23.7	27.5	23.4
Decoder	15.7	22.5	17.9

MELPe C64x+

CPU UTILIZATION

MIPS (C64+)	MIPS (600bps)	MIPS (1200 bps)	MIPS (2400 bps)
Nonlinear Preprocessor (NPP)	11.4	11.5	13.7
Encoder	23.4	23.5	24.8
Decoder	15.1	15.1	17.4

 

MIPS (C674 OMAP) Cache Enabled	MIPS (600bps)	MIPS (1200 bps)	MIPS (2400 bps)
Nonlinear Preprocessor (NPP)	11.4	11.5	13.7
Encoder	23.4	23.5	24.8
Decoder	15.1	15.1	17.4