This version (01 Apr 2024 13:57) was approved by John Joseph.The Previously approved version (12 May 2021 12:49) is available.
Table of Contents
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Sweep Input
Description
The Sweep block generates a sinewave that sweeps from a start frequency to an end frequency. The sweep rate is determined by the number of sweep steps and cycles per step. In case of the linear sweep, the frequency sweep is linear across time whereas in the case of log sweep input, the frequency sweeps logarithmically cross time. The following variants of the module are available:
- Linear Sweep Input
- Linear Sweep With Input Tone Burst
- Log Sweep Input
- Log Sweep With Input Tone Burst
Usage
Enter the desired start and stop frequency and step size using the edit controls:
- Start Freq
- The frequency at which to begin the sweep.
- Stop Freq
- The frequency at which to end the sweep.
- # Steps
- Determines the number of steps in the sweep.
- # Cycles/Step
- Determines the number of the cycles (sine wave cycles) in each step.
Targets Supported
| Name | ADSP-214xx | ADSP-215xx/ADSP-SC5xx | ADAU145x/1456x |
|---|---|---|---|
| LinearSweep and variants | Not Supported | Not Supported | Sample |
| LogSweep and variants | Not Supported | Not Supported | Sample |
Pins
Input
| Name | Type | Description |
|---|---|---|
| Input | Control | Enable/Disable sweep |
Output
| Name | Type | Description |
|---|---|---|
| Output | Audio | Output channel |
Configurable Parameters
| GUI Parameter Name | Default Value | Range | Function Description |
|---|---|---|---|
| StartFrequency | 20 | 0 to 0.5* sample rate | Sets the initial frequency for sinetone sweep |
| StopFrequency | 20000 | 0 to 0.5* sample rate | Sets the final/end frequency for sinetone sweep |
| Steps | 4 | 2 to 48000 | Number of increments in the range defined by start and stop frequency |
| Cycles | 5 | 1 to 500 | Number of cycles to be rendered of a particular frequency |
DSP Parameters
| Parameter Name | Description | ADAU145x/146x |
|---|---|---|
| start_freq | normalised value of start frequency | FixPoint8d24 |
| stop_freq | normalised value of end frequency | FixPoint8d24 |
| numcycles_per_step | Gain, the sinetone wave to be multiplied | Integer32 |
| numsteps | number of steps between start and stop | Integer32 |
| freq_increment | frequency increment defined by range and numsteps | FixPoint8d24 |
DSP Parameter Computation
start_freq= StartFrequency/(FS/2)
freq_increment= EndFrequency/(FS/2)
numsteps= Steps
numcycles_per_step = Cycles
freq_increment = (StartFrequency-StopFrequency)/(Steps-1)
FS, Where fs is frequency and FS is the sampling rate
resources/tools-software/sigmastudiov2/modules/sources/sweepinput.txt · Last modified: 01 Apr 2024 13:57 by John Joseph