This version (12 May 2021 12:50) was approved by Prasad Kamath.The Previously approved version (12 May 2021 12:44) is available.
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Sweep Look Up Sine
Description
The Sweep (Lookup/Sine) block generates a sinewave that sweeps from a start to an end frequency. The sweep speed is determined by the number of steps and cycles per step.
Usage
Enter the desired start and stop frequency and step size using the edit controls:
- Initial Freq
- The frequency at which to begin the sweep.
- Ending Freq
- The frequency at which to end the sweep.
- Step
- Determines the number of steps in the sweep.
- Reset
- Resets the current sweep frequency to the “Initial Freq”.
- Sweep
- Starts the frequency sweep.
- Speed
- Sets the sweep speed, the relative duration of each sweep step.
A valid slope range will be computed depending on the step size entered. The ending tone will be held until reset is clicked, which returns to the initial frequency. The plot below shows the correlation for sweep plots with varying step sizes and slopes.
Targets Supported
| Name | ADSP-214xx | ADSP-215xx/SC5xx | ADAU145x/146x |
|---|---|---|---|
| ———————————-- | ———————— | ——————————-- | —————————- |
| Sine Look up Sweep | Not Supported | Not Supported | Sample |
Pins
Output
| Name | Type | Description |
|---|---|---|
| ——————————— | ———————————- | ————————————-- |
| Output | Audio | Output channel |
Configurable Parameters
| GUI Parameter Name | Default Value | Range | Function Description |
|---|---|---|---|
| —————————————- | ———————- | —————————— | —————————————- |
| InitialFrequency | 150 | 0 to 0.5* sample rate | Sets the initial frequency for sinetone sweep |
| EndFrequency | 10000 | 0 to 0.5* sample rate | Sets the final/end frequency for sinetone sweep |
| SlewStep | 16 | 1 to 23 | Slew step |
| Slope | 1 | 0 to 12 | Gain, the sinetone wave to be multiplied in the lookup |
| Sweep | 1 | 0(off)/1(on) | Switch on and off the sine sweep |
DSP Parameters
| Parameter Name | Description | ADAU145x/146x |
|---|---|---|
| —————————-- | ——————————————————————— | ———————————————— |
| increment1 | increment value for initial frequency | FixPoint8d24 |
| increment2 | increment value for endfrequency | FixPoint8d24 |
| slope | Gain, the sinetone wave to be multiplied | FixPoint8d24 |
| step | slew step | FixPoint8d24 |
| ison | Enabled/Disabled the sweep | FixPoint8d24 |
DSP Parameter Computation
increment1= InitialFrequency/(FS/2)
increment2= EndFrequency/(FS/2)
slope= Slope* 2^(SlewStep-23)
step = 2 ^ (-1* SlewStep)
ison = Sweep
FS, Where fs is frequency and FS is the sampling rate
resources/tools-software/sigmastudiov2/modules/sources/sweeplookupsine.txt · Last modified: 12 May 2021 12:50 by Prasad Kamath