Belar DSD-1A Digital Stereo Decoder




The Belar DSD-1A is a precision FM stereo decoder. It produces 48 kHz AES/EBU digital stereo audio by digitally demodulating analog stereo composite signals. The DSD-1A also provides balanced analog Left, Right, L + R, and L – R outputs on XLR connectors.


The DSD-1A features two front-panel peak level indicators to maintain constant transmission levels. The user adjustable ACTIVITY LED monitors composite activity, while the fixed OVERLOAD LED warns of possible overload.

The DSD-1A is suitable for applications that require digital stereo signals or precision analog left and right stereo signals. Such applications include: obtaining a digital input for use with digital FM exciters, demodulating composite STL’s for AM stereo, obtaining digital audio for digital transmission of house monitors, etc.

Technical Specification

Technical Specification

Input Level     
2.8V- 5.7V P-P composite

Input Impedance    
100 kohm, unbalanced, BNC connector

Digital, Left and Right
AES/EBU, 48 kHz

Analog Left, Right, L+R, L-R

Active 50 ohm Differential Output
Level: +10 dBm into 600 , XLR connector

flat, 50 or 75 µsec (selectable)

Left to Right  

80 dB, 10 Hz to 15 kHz

Right to Left  
80 dB, 10 Hz to 15 kHz

L + R to L – R (matrix)
80 dB min

L – R to L + R (matrix) 
80 dB min

L + R to L – R (direct)
90 dB min

L + R to L – R (direct)
90 dB min

SCA to L + R
90 dB min

SCA to L – R 
90 dB min

SCA Interference  
90 dB min

Analog Audio Output Specifications

Frequency Response, Left and Right 
±0.05 dB flat, 50 to 15 kHz
±0.25 dB de-emphasized

Signal-to-Noise Ratio, with de-emphasis
Left and Right
90 dB

Harmonic Distortion   
< 0.01% 50 to 15 kHz

Intermodulation Distortion    
< 0.01% (SMPTE)

100-240 VAC, 50-60 Hz

New in 2015 – 3 Year Factory Warranty to all Belar Products

© Copyright 2000 Belar Electronics Laboratory, Inc. All rights reserved.

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