Added in API level 37

Summary: Inherited Constants | Fields | Ctors | Methods | Inherited Methods

EqualizerBand

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Kotlin |Java

public final class EqualizerBand
extends Object implements Parcelable

java.lang.Object
↳	android.media.quality.EqualizerBand

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Represents a single band in an equalizer.

An equalizer is composed of multiple bands, each targeting a specific frequency range in the audio spectrum. This parcelable defines the properties of one such band.

Summary

Inherited constants

From interface android.os.Parcelable int CONTENTS_FILE_DESCRIPTOR Descriptor bit used with describeContents(): indicates that the Parcelable object's flattened representation includes a file descriptor. int PARCELABLE_WRITE_RETURN_VALUE Flag for use with writeToParcel(Parcel, int): the object being written is a return value, that is the result of a function such as "Parcelable someFunction()", "void someFunction(out Parcelable)", or "void someFunction(inout Parcelable)".

Fields
public static final Creator<EqualizerBand>	CREATOR

Public constructors
EqualizerBand(int frequencyHz, int gainDb, float qFactor) Constructs an EqualizerBand.

Public methods
int	describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
int	getFrequencyHz() Gets the center frequency of the band in Hertz.
int	getGainDb() Gets the gain for the band in decibels (dB).
float	getQFactor() Gets the Quality Factor (Q).
void	writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Inherited methods
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
From interface android.os.Parcelable abstract int describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. abstract void writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Fields

CREATOR

Added in API level 37

public static final Creator<EqualizerBand> CREATOR

Public constructors

EqualizerBand

Added in API level 37

public EqualizerBand (int frequencyHz, 
                int gainDb, 
                float qFactor)

Constructs an EqualizerBand.

Parameters
frequencyHz	int: The center frequency of this band in Hertz (Hz). Value is 1 or greater
gainDb	int: The gain (level) for this band in decibels (dB).
qFactor	float: The Quality Factor (Q). Value is 0.0f or greater

Throws
IllegalArgumentException	if any parameter is out of its supported range.

Public methods

describeContents

Added in API level 37

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(Parcel,int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

Returns
int	a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either 0 or CONTENTS_FILE_DESCRIPTOR

getFrequencyHz

Added in API level 37

public int getFrequencyHz ()

Gets the center frequency of the band in Hertz.

Returns
int	Value is 1 or greater

getGainDb

Added in API level 37

public int getGainDb ()

Gets the gain for the band in decibels (dB). The range is determined by hardware capabilities. (e.g., -50 to 50 or -100 to 100)

Negative means the signal in this frequency band is reduced, so the output is quieter than the input. (This is used to remove unwanted frequencies like "mud" or "hiss")

Positive means the signal in this frequency band is amplified, so the output is louder than the input.

0 means the signal is unchanged and this is the default state of an equalizer.

Returns
int

getQFactor

Added in API level 37

public float getQFactor ()

Gets the Quality Factor (Q).

The Q factor controls the bandwidth (width) of the frequency range affected by this filter It is inversely proportional to bandwidth:

• High Q (e.g., > 2.0): Creates a narrow, sharp curve. Used for precise adjustments (e.g., removing a specific resonant frequency).
• Low Q (e.g., < 0.7): Creates a wide, broad curve. Used for general tonal shaping (e.g., "boosting the bass").

Returns
float	Value is 0.0f or greater

writeToParcel

Added in API level 37

public void writeToParcel (Parcel dest, 
                int flags)

Flatten this object in to a Parcel.

Parameters
dest	Parcel: This value cannot be null.
flags	int: Additional flags about how the object should be written. May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE. Value is either 0 or a combination of the following: Parcelable.PARCELABLE_WRITE_RETURN_VALUE