Analog TV Vestigial
Side Band Modulator
by M.B. International S.r.l.

Software Overview

The Analogue TV Vestigial Side Band (VSB) modulator algorithm create an RF carrier modulated with a 
video signal according to CCIR specifications.
The input is a digital component or composite video signal.
The output signal has high precision band shaping and phase pre-distortion.
Spurious are lower then in analog circuits with SAW filters.
Black level, sync level, white level have absolute stability giving superior video quality.
Linearity pre-distortion can be applied if used to drive power stages.
Teletext, ITS, and ghost canceling signals can be added.

Features and Benefits

•	Cost comparable to analog
•	Program is downloaded to internal RAM for fast execution
•	Absolute stability—no re-tuning or balance adjustment
•	White level, black level, sync level, and subcarrier phase can be changed at run time
•	First-class IMD, noise-level differential phase, and differential gain
•	Available for PAL and NTSC for all         standard
•	Spurious response lower than analog
•	Precision coder has 16-bit dynamic range
•	Very efficient assembly-optimized language code

Processor and System Requirements

•	Supported on custom hardware with four to six TMS320C80 processors
•	Optional parameters are stored in external RAM
•	Input sampling rate is 13.5 MHz as per CCIR 601
•	Output Sampling rate 108 MHz @ 16 bit
•	Only 1k-word RAM required

Usage Limitations or Performance Considerations

•	-65-dBc, 2-tone intermodulation
•	-70-dB, 3-tone intermodulation and spurious
•	0.1-dB frequency-response tolerance
•	2-ns group delay error
•	No differential gain or phase
•	Positive or negative modulation
•	Precision offset possible

Algorithm Verification

•	All CCIR test signals
•	15-tone THD test signal supplied
•	Pulse for frequency and group delay measurement supplied
•	Conform to ITU-R BT.470-3

Availability

Available 2Q96

Company Background and Contact Information

M.B. International is a research and design company serving mainly broadcasting equipment 
manufacturers. Our lab has 20 years of experience and has contributed to the big development of the 
Italian broadcasting industry. We are now an international company, serving customers worldwide. 
Several patents certify our involvement in new technologies.
Contact:	Mike Bargauan
		M.B. International srl
		Via Beolchi 1
		20151, Milano
		Italy
		+39 2 4091 0570
		Fax: +39 2 4091 0582
		e-mail: 100522.2272@compuserve.com