![]() This DC offset can apply to the noise and sweep type signals only when the periodic signal type is switched on. – In the Signal Generator tool, DC offset can be applied independently to left and right output channels in the periodic signal generator. The Mac version also properly recognizes changes in the list of connected devices, such as when a device is connected to or disconnected from the Mac. On the Mac, the improvements to audio handling also eliminate some bugs that could cause the app to crash or hang. – Enhanced real-time audio processing for better performance and better measurements at higher sample rates. – Improved support for audio interfaces with DC-coupled inputs, including optional DC offset correction and DC blocking filters per input channel. As always, take care to avoid applying too high a voltage to the input channels, as well. It is also best to avoid connecting a load to the output of your DC-coupled audio device that would draw too much current, which could potentially cause damage. It has the potential to damage sensitive audio components, like loudspeakers. Note: Take care not to send DC output to any connected hardware that won’t tolerate it. Input and output channel waveforms with DC offsets This allows for measurements to be made using an ES interface with ballpark accuracy without any manual calibration. SignalScope X will recognize the ES-8 or ES-9 and automatically set the device units to Volts and the device sensitivity to 10 V/FS, since the nominal input range of the ES devices is +/- 10V. When calibrating the input channel for DC measurements, it is best to enter the DC correction factor before performing the sensitivity calibration. The DC blocking filter and DC correction options are mutually exclusive–only one may be used at a time. You can tap the “Auto Set” button to have SignalScope X automatically calculate the mean of the input signal and apply that as the DC correction value (make sure the input should be ‘seeing’ a zero mean, or zero DC value, when using the Auto Set function). The value will be subtracted from the input signal before the signal is routed to any of SignalScope X’s analysis or recording tools. The DC correction factor can be used to calibrate the input channel for accurate DC level measurements. Within this submenu, you can choose to enable a DC-blocking filter (cutoff < 0.5 Hz) or enter a DC correction factor. The Input Channels menu in SignalScope X now offers a DC Correction submenu for each input channel. Expert Sleepers ES-9 DC-coupled audio interface in a 4ms Pod34X enclosure In the case of the Expert Sleepers ES-9, which we tested, DC-coupling was not enabled by default. All devices offer configuration software with which DC-coupling can be turned on or off. The ES-8 and ES-9 rely on the standard USB Audio Class drivers, so they can be used with your iPhone or iPad, as well as your Mac. At the present time, we are aware of 3 audio interfaces that do: the Expert Sleepers ES-8 and ES-9 Eurorack modules and Antelope Audio’s Orion Studio Synergy Core. The number of audio interfaces with DC-coupled output channels seems to have been growing for some time, although very few interfaces offer DC-coupled inputs. With the release of version 11.4 of SignalScope X, you can more easily analyze and generate signals with DC content, as long as you have compatible hardware with DC-coupled input and/or output channels.
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