Speex Codec - Audio Speech Compression

Sampling Rate: Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream.

AVAILABILITY

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

Product Number	Platform
ADT_speex_c64xp	TI TMS320C64x+
ADT_speex_c674x	TI TMS320C674x

 

DESCRIPTION

The Speex codec is a flexible speech compression algorithm that can be used in a wide variety of voice applications including Voice Over IP (VoIP).

The following features are included in the Speex codec. These features can be configured by the
host application.

Data sheet: .pdf  

FEATURES

1. Perceptual Enhancement
2. Packet loss concealment
3. Constant, Average, and Variable bitrate operation
4. Configurable complexity AND quality enables user to tradeoff between CPU utilization and voice quality
5. Wide variety of user-specified bit rates
6. Voice Activity Detection (VAD)
7. Discontinuous Transmission (DTX)

SPECIFICATIONS

MIPS (Peak) CPU Resource and Memory Resource Requirements

TI TMS320C6000

C674x

MEMORY REQUIREMENTS

All Memory usage is given in units of byte. 

Software	Program Memory	Data Mem	Tables	Scratch
Encode	170K	1508	19256	64080
Decode				32080

- PER CHANNEL

 All Memory usage is given in units of byte. 

Mode	Encoder	Decoder
Narrowband	6461	5773
Wideband	7709	6840
Ultra-Wideband	9117	8067

C674x

CPU UTILIZATION

Narrowband Mode CPU Requirements (MIPS = MHz)

			Current		Target
Quality	Complexity	Bit Rate	Encode MIPS	Decode MIPS	Encode MIPS	Decode MIPS
10	10	24600	175	8.3	58	3
10	4	24600	69	8.3	23	3
4	10	8000	75	7.5	25	3
4	4	8000	42	7.5	14	3

 

Wideband Mode CPU Requirements (MIPS = MHz)

			Current		Target
Quality	Complexity	Bit Rate	Encode MIPS	Decode MIPS	Encode MIPS	Decode MIPS
10	10	42400	363	14	121	4
10	4	42400	156	14	52	4
4	10	12800	129	14	43	4
4	4	12800	71	14	23	4

 

Ultra-Wideband Mode CPU Requirements (MIPS = MHz)

			Current		Target
Quality	Complexity	Bit Rate	Encode MIPS	Decode MIPS	Encode MIPS	Decode MIPS
10	10	44000	375	23	125	8
10	4	44000	167	23	55	8
4	10	22375	164	22	55	8
4	4	22375	85	22	28	8

API function call summary

SPEEX_ADT_initEncoder()

SPEEX_ADT_initDecoder()

SPEEX_ADT_encode()

SPEEX_ADT_decode()

SPEEX_ADT_deleteEncoder()

SPEEX_ADT_deleteDecoder()

SPEEX_ADT_getStatus()