L&H.smc250
by Lernout & Hauspie Speech Products

Software Overview

L&H.smc250 Coder provides the ability to compress (encode) and decompress (decode) speech for more 
efficient storage and faster transmission. The product is based on the combination of multi-band 
excitation and codebook excited linear prediction with propriety improvements. L&H.smc250 is 
designed to cover the range between 1.0 to 4.0 kbps. The quality is estimated at 3.0 MOS (Mean 
Opinion Score).

Features and Benefits

•	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.
•	Enhanced perceptual and dynamic filtering techniques maintains speech quality at low bit rates.
•	Silence management allows 20% extra savings.

Processor and System Specifications

•	Devices supported: TMS320C25
•	Algorithm category: Vocoder
•	Requirements:
Program memory (in words): encode: 7500  decode: 5000
Data memory (in words): encode: 3000  decode: 4000
Processor loading (MIPS): encode:  20  decode:  20

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