Difference between revisions of "SpectrumChannel (Java)"
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| − | |[[SubscribersNotifier Class|SubscribersNotifier]] | + | |[[SubscribersNotifier Class|SubscribersNotifier]]<Long> |
|[[#dataLengthChanged|'''dataLengthChanged''']] | |[[#dataLengthChanged|'''dataLengthChanged''']] | ||
Subscribe this event to receive notifications about changes of total length of data | Subscribe this event to receive notifications about changes of total length of data | ||
Revision as of 11:09, 25 July 2018
ru.neuromd.neurosdk.channels
Class SpectrumChannel
Contents
Related Classes
ru.neuromd.neurosdk.BaseChannel
ru.neuromd.neurosdk.SignalChannel
Classes hierarchy
- java.lang.Object
- ru.neuromd.neurosdk.channels.BaseChannel
- ru.neuromd.neurosdk.channels.SpectrumChannel
Class definition
public class SpectrumChannel
SpectrumChannel class provides tools to get signal spectrum information through basic schannel interface
Fields Summary
| Modifier and Type | Field and Description |
| SubscribersNotifier<Long> | dataLengthChanged
Subscribe this event to receive notifications about changes of total length of data |
Constructor Summary
| Constructor | Description |
| SpectrumChannel([[BaseChannel<Double>|BaseChannel (Java)]] channel) | Creates new instance of SpectrumChannel for specified data channel |
Methods Summary
| Modifier and Type | Method and Description |
| ChannelInfo | info()
Returns channel information |
| SampleType[] | readData()
Requests spectrum data for underlying channel data with specified offset and length, which must be set in terms of totalLength parameter of passed to constructor data channel. If there is no enough data to read from signal buffer, nonexistent samples will be filled with zeros. CAUTION Length of the result array will not be equal to requested data length. Result array has library-defined spectrum length. To get information about frequency step of spectrum samples call #hzPerSpectrumSample method |
| long | totalLength()
Returns total length of data been added to underlying channel buffer. To get more info see .BaseChannel |
| long | bufferSize()
Returns size in samples of internal channel buffer. If there is no internal buffer or it does not have maximum size this method returns zero |
| float | samplingFrequency()
Returns sampling frequency of underlying data channel. |
| void | setSamplingFrequency(float frequency)
This channel does not support setting of sampling frequency. Throws an exception, |
| Device | underlyingDevice()
Returns device this channel belongs to |
Field Detail
dataLengthChanged
public final SubscribersNotifier<Long> dataLengthChanged
Subscribe this event to receive notifications about changes of total length of data
Method Detail
Example
This example shows how to find devices and list their features
import com.neuromd.common.INotificationCallback; import com.neuromd.neurosdk.Device; import com.neuromd.neurosdk.DeviceScanner; import com.neuromd.neurosdk.channels.ChannelInfo; import com.neuromd.neurosdk.parameters.Command; import com.neuromd.neurosdk.parameters.Parameter; import com.neuromd.neurosdk.parameters.ParameterName; import com.neuromd.neurosdk.parameters.types.DeviceState;
Possible output:
