# Shared Features: Calculated Analog or Digital Signals An [Application Signal](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-scripting-and-automation/application-signals) or a [Tx Panel signal](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/transmit-panel/dynamic-transmit-message-bytes) can have a numeric value which can be interpreted as an analog or digital [Signal Type](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type). There are many different ways a signal can be calculated. The different calculations are created with the [Setup Calculated Signal](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/shared-features-in-vehicle-spy/shared-features-calculated-signal-editor) screen. The descriptions for the different options are listed in Table 1 below.\ \ If a signal property has an equation button (![](https://cdn.intrepidcs.net/support/VehicleSpy/assets/spyEQ.gif)) next to it, you can enter an [equation](https://docs.intrepidcs.com/vspy-3-documentation/3.9.12/shared-features-in-vehicle-spy/shared-features-expression-builder) for the signal instead of a static value. This will let you modify signals based on other Vehicle Spy data. For example, you could use a knob to change the frequency of a sine wave. **Table 1: Listing of Numeric Calculated Signal Types**

Calculated Signal Type	Description
Random Data Properties: Min, Max	This signal calculates a random value between the Min and Max properties.
Sinusoidal Wave Properties: Min, Max, Frequency, Phase	This signal creates a sine wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.
Ramp Properties: Min, Max, Frequency, Phase	This signal creates a ramp wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.
Triangle Properties: Min, Max, Frequency, Phase	This signal creates a Triangle wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.
Square Properties: Min, Max, Frequency, Phase, Duty Cycle	This signal creates a square wave between the Min and Max value with the specified frequency and duty cycle. It will also delay the waveform in relation to others using the Phase parameter.
Custom List Properties: List of Points	This calculation will replay a list of values into the signal. After it replays the list it will start over at the first list item.
Equation Based Properties: Min, Max, Equation	This calculation will use an Expression Builder equation to update a signal. The Min and Max properties are optional. Leave them blank if you do not want to use them. If not blank, a Min and/or Max limit will be applied to the result.
Static Value Properties: Value	This calculation will use the static value entered in the value entry.
Remote Signal Properties: Remote Server, Application Signal	This calculation will use an application signal value from another instance of Vehicle Spy on a network. The parameters for this type of application signal are the Remote server to connect to and the application signal to read in. The Update List button will repopulate the dropdown lists.