L&H.smc350
by Lernout & Hauspie Speech Products

Software Overview

L&H.smc350 Coder provides the ability to compress (encode) and decompress (decode) speech for more 
efficient storage and faster transmission. The product utilizes proprietary codebook excited linear 
prediction algorithms. The quality is estimated at 3.5 MOS (mean opinion score).

Features and Benefits

•	Coding rates of 4.8 kbps - 9.6 kbps
•	Silence management allows 20% extra savings.
•	Transmission savings of up to 27 times compared to regular m-law or A-law PCM.
•	Real-time compression and decompression.
•	Storage savings of up to 54 times compared to linear sampling.

Processor and System Specifications

•	Devices supported: TMS320C25, TMS320C30, TMS320C50
•	Algorithm category: Vocoder
•	Requirements: Program memory (in words): `C25 encode: 6000
						         decode: 1750
`C30 encode: 6475–6750
						         decode: 5850–58751
`C50 encode: 4000–43001
						         decode: 1300
Data memory (in words):
`C25 encode: 2000
				         decode: 1250
`C30 encode: 1475–16001
			         decode: 925–10501
`C50 encode: 2000–21501
			         decode: 1150–13001
Processor loading:
`C25 encode:  14
						         decode: 2.5
`C30 encode: 9.0–121
						         decode: 1.5
`C50 encode: 10.25–14.01
         decode: 1.0 –2.61

•	Data rate (Kbps):
`C25: 4.8
`C30: 4.8, 7.2, 9.6
`C50: 4.8, 7.2
Sampling rate: 8 kHz

Availability

•	Now

Company Background and Contact Information

Lernout & Hauspie Speech Products is the international leader in the development of speech 
technology for commercial products in four markets: Telecommunications, Computers & Multimedia, 
Automotive Electronics, and Business Electronics. The company offers more speech processing 
products, for more worldwide markets, than any other company. Its integrated products are built on 
its core speech recognition, text-to-speech, and speech-coding technologies. Available in multiple 
languages and multiple platforms.

Contact:	Scott Garlick
		Sint-Krispijnstraat 7
		8900 Ieper, Belgium
		32-2-456-0500
		Fax: 32-2-460-0172
Contact:		Burr Tupper
		800 West Cummings Park 
		Suite 3100
		Woburn, MA 01801
		USA
		(617) 932-4118
		Fax: (617) 932-9209

Contact:		G. K. Chen
		RM 9, 4F, No. 6, Lane 609
		Section 5
		Chung Hsing Rd, SanChung
		Taipei Hsien, Taiwan R.O.C.
		886-2-999-2415
		Fax: 886-2-999-2416

		WWW homepage address: 
		www@lhs.com