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DSD-1A Photo


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.


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

    Audio                               Active 50 ohm Differential Output

                                        Level: +10 dBm into 600 , XLR connector

    De-emphasis                         flat, 50 or 75 Ásec (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%


Power                                   100-240 VAC, 50-60 Hz

© Copyright 2000 Belar Electronics Laboratory, Inc. All rights reserved. Specifications subject to change without prior notice.

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