Minim Frequency ofHertz Description Construct a Frequency that represents the provided Hertz. Signature ```Frequency ofHertz(float hz) ``` Parameters hz — float: the Hz for this Frequency (440 is A4, for instance) Returns a new Frequency object Related Frequency Example ```/* frequencyExample
is an example of using the Frequency class to easily turn keyboard input into the frequency of an Oscil. Simply type on the home row to change the pitch of the tone.

For more information about Minim and additional features, visit http://code.compartmental.net/minim/ */ // import everything necessary to make sound. import ddf.minim.*; import ddf.minim.ugens.*; // create all of the variables that will need to be accessed in // more than one methods (setup(), draw(), stop()). Minim minim; AudioOutput out; Oscil wave; // keep track of the current Frequency so we can display it Frequency currentFreq; // setup is run once at the beginning void setup() { // initialize the drawing window size(512, 200); // initialize the minim and out objects minim = new Minim(this); out = minim.getLineOut(); currentFreq = Frequency.ofPitch( "A4" ); wave = new Oscil( currentFreq, 0.6f, Waves.TRIANGLE ); wave.patch( out ); } // draw is run many times void draw() { // erase the window to brown background( 64, 32, 0 ); // draw using a beige stroke stroke( 255, 238, 192 ); text( "Current Frequency in Hertz: " + currentFreq.asHz(), 5, 15 ); text( "Current Frequency as MIDI note: " + currentFreq.asMidiNote(), 5, 30 ); // draw the waveforms for( int i = 0; i < out.bufferSize() - 1; i++ ) { // find the x position of each buffer value float x1 = map( i, 0, out.bufferSize(), 0, width ); float x2 = map( i+1, 0, out.bufferSize(), 0, width ); // draw a line from one buffer position to the next for both channels line( x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50); line( x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50); } } // change the midi note when pressing keys on the keyboard // we set midiNoteIn directly with the setMidiNoteIn method // but you could also use a Line to lerp to the next note // by patching it to midiNoteIn. void keyPressed() { if ( key == 'a' ) currentFreq = Frequency.ofPitch( "A4" ); if ( key == 's' ) currentFreq = Frequency.ofPitch( "B4" ); if ( key == 'd' ) currentFreq = Frequency.ofPitch( "C#5" ); if ( key == 'f' ) currentFreq = Frequency.ofPitch( "D5" ); if ( key == 'g' ) currentFreq = Frequency.ofPitch( "E5" ); if ( key == 'h' ) currentFreq = Frequency.ofPitch( "F#5" ); if ( key == 'j' ) currentFreq = Frequency.ofPitch( "G#5" ); if ( key == 'k' ) currentFreq = Frequency.ofPitch( "A5" ); if ( key == 'l' ) currentFreq = Frequency.ofPitch( "B5" ); if ( key == ';' ) currentFreq = Frequency.ofPitch( "C#6" ); if ( key == '\'') currentFreq = Frequency.ofPitch( "E6" ); // note that there are two other static methods for constructing Frequency objects // currentFreq = Frequency.ofHertz( 440 ); // currentFreq = Frequency.ofMidiNote( 69 ); wave.setFrequency( currentFreq ); } ``` Usage Web & Application