The AM penalty scheme appears in Guidance Note 4 of the scheme and is reproduced in Fig 1 below: Fig 1 The Penalty Scheme Contained in the RenewableUK Planning Condition for AM The interpretation of this penalty scheme is as follows: • for AM with a peak to trough level of < 3 dB there is no AM penalty • for AM with a peak to trough level of 3 – 10 dB there is a sliding scale of penalties ranging. [...] 1 ‘Modulation depth’ was defined, in the context of these tests, as the difference between the mean peak level and the mean trough level in the A- ‐weighted, RMS time series over the length of the test stimulus. [...] 2 ABBS: Adapted Broadband Stimulus – see [4] for further details 2 | P a g e [A PENALTY SCHEME FOR AM WIND FARM NOISE] December 2013 This last point suggests that it is possible to separate out the annoyance due to the overall level of noise from that due to modulation depth, and this may be achieved by ‘normalising’ (or differencing) the results for a particular overall leve. [...] 3 It is possible that the 45 dB(A) results indicate that, at high overall noise levels, the impact of a given level of modulation is reduced, although more experiments would be needed to verify this. [...] 4 Note sign difference due to the design of the experiment.
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