AM Mono/Stereo
Transmitter
by M.B. International S.r.l.

Software Overview

This software converts an AES/EBU audio input into a modulated AM MW stereo signal.
The software can be configured for operation as mono, stereo with independent side bands method or 
stereo with C-QUAM method.
The output signal complies to all FCC specifications, including modified emphasis, multiple setup 
for different operating conditions, and asymmetrical modulation depth.

Features and Benefits

•	Cost comparable to analog
•	Very efficient assembly-optimized language code
•	Absolute stability—no re-tuning or balance adjustment
•	Program is downloaded to internal RAM for fast execution
•	Top class IMD, noise level, and spurious
•	Instant switchable between mono and stereo
•	Out-of-band response lower than analog
•	Instant change to different set of para-meters

Processor and System Requirements

•	Supported on `C3x @ 50 and 60 MHz
•	Optional parameters are stored in external RAM
•	Input sampling rate is 32, 44.1, or 48 kHz @ 16 to 24 bit
•	Output sampling rate up to 8 MHz @ 16 bit
•	Only 1 k word data RAM required
•	1 k word program RAM
•	External program memory (ROM): 4 k word

Usage Limitations or Performance Considerations

•	External program memory (ROM): 4k words
•	External optional parameters memory (RAM): 6 word
•	Internal data memory: 1k words
•	Internal program memory: 1k words
•	Processor loading: requires exclusive use of processor

Algorithm Verification

•	15-tone THD test signal supplied
•	Single-tone suprious test signal supplied
•	Pulse for frequency and group delay measurement supplied
•	Conforms to NRSC standard

Availability

Available now

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