[{"data":1,"prerenderedAt":27},["ShallowReactive",2],{"content-tone-generator-en":3},{"about":4,"steps":7,"faq":11},[5,6],"The tone generator creates test tones from 20 Hz to 20,000 Hz right in your browser as sine, square, sawtooth or triangle waves, plus white and pink noise. Set the frequency with a logarithmic slider on which every octave has the same width, by typing a number, in semitone and octave steps or with quick buttons such as A4 = 440 Hz and 1 kHz. Next to the frequency it shows the nearest note and the deviation in cents.","The frequency sweep glides linearly or logarithmically from a start to an end frequency – useful for finding resonances, rattles or the limits of speakers and of your own hearing. The channel switch plays the tone on the left only, the right only or both sides. The volume starts at a quiet −24 dBFS. To convert levels, use the [[db-calculator]]; the [[tuner]] also plays a reference tone for tuning.",[8,9,10],"Turn your device volume down and choose a waveform.","Set the frequency with the slider, the number field or a quick button, or enable the sweep with a start and end frequency.","Press Start, raise the volume slowly and pick the left or right channel if needed.",[12,15,18,21,24],{"q":13,"a":14},"What is the difference between white and pink noise?","White noise has the same energy in every hertz and therefore sounds bright and hissy. Pink noise loses 3 dB per octave, so every octave contains the same energy – closer to how we hear. That is why pink noise is used to measure speakers and rooms. The generator derives it from white noise with Paul Kellet’s filter.",{"q":16,"a":17},"Why is the frequency slider logarithmic?","We hear frequencies logarithmically: every doubling sounds like the same step, an octave. On the slider, 20 to 40 Hz therefore takes as much room as 10 to 20 kHz, and the middle is at about 632 Hz. For the same reason a logarithmic sweep sounds more even than a linear one.",{"q":19,"a":20},"Why can’t I hear very low or very high tones?","Small speakers in phones and laptops reproduce hardly anything below about 100–200 Hz, and hearing loses the high frequencies with age – many adults hear nothing above 15–16 kHz. Do not raise the volume without limit at such frequencies: speakers can be damaged even if you hear nothing.",{"q":22,"a":23},"How do I check that the left and right channels are connected correctly?","Set the channel to “Left” or “Right” and press Start. The tone must come only from that speaker or earphone. If it comes from the wrong side, the cables are swapped; if it sounds thin and without bass on “Both”, one speaker is often wired out of phase.",{"q":25,"a":26},"What does dBFS mean for the volume?","dBFS (decibels relative to full scale) refers to the highest level the digital signal can reach: 0 dBFS is full scale, −6 dBFS half the amplitude, −20 dBFS a tenth. How loud that actually sounds depends on the volume of your device and speakers.",1792336935242]