Signal Description Datatypes

OcaDB

using OcaDB = OcaFloat32 : A ratio expressed in dB. Typically used for gain settings.

OcaDBr

struct OcaDBr

An absolute level expressed in dB above the given absolute reference level.

OcaDB Value: Absolute level in decibels relative to value of Ref property.

OcaDBz Ref: Reference level in dBz. See the definition of OcaDBz for an explanation of the dBz unit.

OcaDBV

using OcaDBV = OcaDB : An absolute analogue level expressed in dB re 1 volt. This datatype may only be used for parameters that reflect analogue signal values, e.g. pre-ADC input signals and post-DAC output signals.

OcaDBu

using OcaDBu = OcaDB : An absolute analogue level expressed in dB re 0.774 volts. This datatype may only be used for parameters that reflect analogue signal values, e.g. pre-ADC input signals and post-DAC output signals.

OcaDBFS

using OcaDBFS = OcaDB : An absolute level value for digital signals, expressed in dB relative to the device maximum internal digital sample value. For example, a digital signal whose peak sample value is 7dB below the maximum digital sample value shall be said to have a peak level of -7 dBFS.

OcaDBz

using OcaDBz = OcaDB : An absolute level expressed in dB relative to the nominal device operating level. The nominal device operating level is a device-specific signal level chosen as a normal or typical signal amplitude for the device.

OcaVoltage

using OcaVoltage = OcaFloat32 : Voltage in volts.

OcaCurrent

using OcaCurrent = OcaFloat32 : Current in amperes

OcaFrequency

using OcaFrequency = OcaFloat32 : Frequency in Hertz.

OcaPresentationUnit

enum OcaPresentationUnit : uint8_t

Enumeration of presentation units that can be used in OCA classes. Property values of OCA objects are always in SI units (unless explicitly documented otherwise), but the presentation unit can also be stored to indicate in which unit the value was presented in a user interface. This way another controller can also present it in that unit (i.e. doing a conversion on the controller before presenting it) to keep the user presentation uniform. Note that the presentation unit may be equal to the unit of the property (in which case of course no conversion is needed).

enumerator dBu = 0: dB(0.775 VRMS) - voltage relative to 0.775 volts.

enumerator dBV = 1: dB(1 VRMS) - voltage relative to 1 volt.

enumerator V = 2: Voltage in plain volts.