AdvancedA-005-007-002
Speech compression associated with SSB transmission implies:
A
Answer
Antennas and transmission lines
Type
A
full amplification of low level signals and reducing or eliminating amplification of high level signals
B
full amplification of high level signals and reducing or eliminating signals amplification of low level
C
circuit level instability
D
a lower signal-to-noise ratio
Answer Notes
Speech compression in an SSB transmitter is designed to increase the average power of the transmitted signal without exceeding the peak power limits of the amplifier. It achieves this by reducing the overall dynamic range of the human voice.
To compress the speech, the circuit provides full amplification to the softer, low-level voice components while reducing or clipping the amplification of the louder, high-level peaks. This results in a "punchier" signal that is much easier for the receiving station to hear over background noise.
Reversing this logic by amplifying high-level signals and reducing low-level ones would actually expand the dynamic range, making the softer parts of speech even harder to hear and completely defeating the purpose of a speech processor.
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Maintaining the peak RF output of a SSB transmitter at a relatively constant level requires a circuit called the:
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Which of the following functions is not included in a typical digital signal processor?