When the Link Harmonics control is set to Odd/Even, a separate control appears that affords independent control over the slope for both odd and even harmonics. As the harmonic order increases, the gain level resolves closer to 0 dB. SLOPE: When harmonics are linked, this controls the harmonic slope of the gain nodes for each overtone. NONE: presents individual gain nodes for the fundamental and each harmonic.ODD/EVEN: presents two nodes on the display, one for controlling the gain of the fundamental frequency and even harmonics, and another for controlling the 1st harmonic and any following odd harmonics.ALL: presents a single node on the display for controlling the gain of all the notch filters.LINK HARMONICS: Connects the gain controls of the notch filters. After selecting the number of harmonics, use the Slope control to set how aggressively the higher harmonics are attenuated. The spectrogram display can make it easy to identify the harmonics. Using the Number of Harmonics control, you can select up to 7 harmonics above the fundamental. NUMBER OF HARMONICS: Because harmonics often accompany the fundamental frequency of a hum, De-hum can also attenuate these overtones with notch filters. That resonance can be mitigated by engaging the Linear-phase filters. In the default IIR filter mode with a high Q setting, you may notice a resonance at the cutoff frequency characteristic of traditional analog filters. Q: Sets the bandwidth of the filter (or dB/octave cut).FREQUENCY : sets the cutoff frequency for the filter.These can be useful for tackling extreme hum or buzz. HIGH/LOW-PASS FILTERS: These traditional filters come ahead of the De-hum notch filters, and allow for frequencies to pass above or below a certain cutoff point. Latency Consideration: Disabling Linear Phase Filters will reduce the latency used by De-hum when it is being used as a real-time plug-in.These are also very accurate, and are only susceptible to post-ringing, which is usually less noticeable than the pre-ringing introduced by FIR filters. When Linear Phase is disabled, De-hum will use minimum-phase IIR filters.These filters provide very accurate frequency response with no change in phase at the expense of latency and filter pre-ringing. LINEAR-PHASE FILTERS: Linear-phase enables FIR (Finite Impulse Response) filters with a high FFT size.
Make a selection containing the hum in isolation, and click the Suggest button.
SUGGEST: De-hum can intelligently identify the noise profile of the hum in your audio.You can also use the Spectrum Analyzer to help identify the base frequency of the hum.
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