Isomet Modular Synthesiser (iMS) API
v1.4.2
iMS API
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Classes for creating and downloading data that is used in the Compensation tables of the Synthesiser. More...
#include "Containers.h"
#include "IMSSystem.h"
#include "IEventHandler.h"
#include "IMSTypeDefs.h"
#include "IBulkTransfer.h"
#include "FileSystem.h"
#include <memory>
#include <deque>
Go to the source code of this file.
Classes | |
class | iMS::CompensationEvents |
All the different types of events that can be triggered by the Compensation and CompensationTableDownload classes. More... | |
class | iMS::CompensationPoint |
Stores 4 data fields containing amplitude, phase, sync analogue and sync digital compensation data. More... | |
class | iMS::CompensationPointSpecification |
Completely specifies the desired compensation at a spot frequency. More... | |
class | iMS::CompensationFunction |
Class for performing Compensation related functions with the Synthesiser. More... | |
class | iMS::CompensationTable |
A table of CompensationPoints storing look-up data that can be transferred to memory in the Synthesiser. More... | |
class | iMS::CompensationTableDownload |
Provides a mechanism for downloading and verifying Compensation Tables to a Synthesiser's Look-Up memory. More... | |
Namespaces | |
iMS | |
The entire API is encapsulated by the iMS namespace. | |
Classes for creating and downloading data that is used in the Compensation tables of the Synthesiser.
The Compensation Tables are a part of the signal chain in the Synthesiser. There are 4 of them, each serving a different purpose. All 4 are indexed by the signal frequency, spanning the lowest to the highest frequency supported by the Synthesiser, each table consisting of a sequence of look-up entries (typically 2,048) spaced equidistantly in frequency.
The 4 tables are:
(1) Amplitude: used to compensate for frequency-dependent inefficiency in the AO device, as well as in the RF Amplifier and the Synthesiser. The signal amplitude passing through the Synthesiser is multiplied by the compensation output to result in a combined amplitude being passed to the Synthesiser DDS device.
(2) Phase: used in beam-steered AO applications where multiple acoustic columns present in the crystal are offset in phase from each other in a way that is linearly dependent on the frequency offset from a central Bragg Angle adjusted frequency.
(3) Analogue Sync: The output of this table can be routed to the Synchronous DAC output which gives a handy analogue reference signal for either test purposes or for driving external custom circuitry. The advantage of driving this from the look-up table is that custom mappings can be generated which allows great flexibility in configuring the analogue signal in relation to the signal frequency that drives it.
(4) Digital Sync: As with the analogue sync, the output of this table is routed to external synchronous outputs which can be used for test purposes or for driving external custom circuitry. The digital output bits could, for example, be used to tune signal conditioning circuitry as the RF signal passes through certain frequency bands.