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The HumBug Noise Eliminator is the ideal piece of biological research technology, aiding in reducing contamination in signal readings from biological sensors and high impedance devices.
Need to remove noise from more than one channel?
Those of you wanting to remove mains interference from multiple channels can use more than one Humbug, but they are not inexpensive devices. Fortunately, Digitimer have developed the our new D400 Two and Four Channel Main Noise Eliminators for cost-effective mains noise removal in multi-channel recording applications. The D400-2 and D400-4 remove mains noise from signals using a similar approach to the Humbug, but do so independently for several channels, even making it possible to share a single D400 across multiple rigs.
The Traditional Approach
A New Solution – 50 or 60Hz Noise Removal without Filtering
Publications which cite use of the Humbug can be found on Google Scholar.
The HumBug is NOT a mains noise filter, making this the main reason it is a special, perhaps unique product. Filtering often results in phase shifts, frequency loss, amplitude errors, DC shifts, time delays or digital distortion. The HumBug will eliminate 50/60Hz electrical interference (and harmonics) without altering your signal of interest.
A noisy waveform is the summation of two separate components. One component is the biological signal of interest and the other is noise of various forms. These forms of noise include random fluctuations generated by the sensor, amplifier and background biological noise in the vicinity of an experimental setup. The HumBug is designed to cancel electrical interference. It constructs a replica of noise embedded within the input signal and subtracts this replica from the noisy signal as it passes through the device. The end result is an output which contains only the signal of interest – mains noise removal without filtering.
The HumBug adapts rapidly when the input signal is dominated by noise and proceeds more slowly when low amplitude noise is embedded within continuous physiological activity. Adaptation is also slower for harmonics with frequencies greater than 1kHz.
Yes, but please remember that the HumBug is a single channel device, therefore you will need one HumBug for each channel of interest.
First you should check that the HumBug is configured to remove noise of the appropriate frequency. You can check this as it should be indicated next to the power connection socket on the back of the unit. It may be possible that the noise you are experiencing is not picked up from the mains supply. If the peak to peak noise is too large for the HumBug to completely cancel. If so, the indicator will continue to flash red. The HumBug cannot eliminate noise greater that 1V peak to peak. Likewise, low amplitude noise (<15mv) can be difficult to remove, so it is suggested that you increase the gain of your signal to ensure that the amplitude is greater than 15mV peak to peak.
It is possible, but not as easy as it seems to be at first glance. The problem is, that the EPC 10 has no Current In AD channel. The current signal from the amplifier board is hard wired with the AD converter inside the housing of the amplifier. Therefore it is not possible to connect the output of Filter 1 or Filter 2 via the HumBug and a Current In AD.
One would have to use one of the free AD inputs of the EPC 10 for reading the current signal. This has some drawbacks: the “real” current AD is automatically scaled by the “gain” that is set in the amplifier dialog. This is not the case for other AD inputs. As a consequence, you would have to scale the AD input manually (in the configuration dialog). This is no problem as long the gain is kept at the same value during an experiment. However, if the gain is changed frequently, then it might become annoying to change the AD scaling in the configuration many times.
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