Tutorials and Topics - Peabody Computer Music

Tutorial 23: Analysis—Viewing signal dataDisplay the value of a signal: number~This chapter demonstrates several MSP objects for observing the numerical value ofsignals, and/ or for translating those values into Max messages.• Turn audio on and send some sound into the input jacks of the computer.Every 250 milliseconds the number~ objects at the top of the Patcher display the currentvalue of the signal coming in each channel, and the meter~ objects show a graphicrepresentation of the peak amplitude value in the past 250 milliseconds, like an analogLED display.Current signal value is shown by number~; peak amplitude is shown by meter~The signal coming into number~ is sent out its right outlet as a float once every time it’sdisplayed. This means it is possible to sample the signal value and send it as a message toother Max objects.The number~ object is actually like two objects in one. In addition to receiving signalvalues and sending them out the right outlet as a float, number~ also functions as afloating-point number box that sends a signal (instead of a float) out its left outlet.185