December 2023
Intermediate to advanced
846 pages
26h 46m
English
Content preview from Small Signal Audio Design, 4th Edition
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CHAPTER 23 Level indication and metering
Signal-present indication
Some amplifiers and the more sophisticated mixers are fitted with a ‘signal-present’ indicator that illuminates to give reassurance that a channel is receiving a signal and doing something with it. The level at which it triggers must be well above the noise floor, but also well below the peak indication or clipping levels. Signal-present indicators are usually provided for each channel and are commonly set up to illuminate when the channel output level exceeds a threshold something like 20 or 30 dB below the nominal signal level, though there is a wide variation in this.
A simple signal-present detector is shown in Figure 23.1, based ...
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