VuMeter

[Tristan SABOURIN]

Hello ! 

What is the function to display the value of a signal on a vumeter ?

I tried something like this : 

a = Input()
...
...
b.out()

c = RMS(b)
d = c.get()
vm = PyoGuiVuMeter(my_panel), nchnls=2)

vm.display(d)

But it doesn't work, vumeter is displayed on my wxPython window, but not the signal.

Thanks a lot

[Tristan SABOURIN]

Nobody can help me ? :(

[Olivier Bélanger]

Hi Tristan,

Take a look in this code how the setRms() function of the PyoGuiVuMeter is bounded to an RMS object:

from pyo import *

s = Server().boot().start()

audioInputs = Input([0,1])

audioRMS = RMS(audioInputs)

class MyFrame(wx.Frame):

def __init__(self, parent, id=-1, title="Frame Title", pos=(25,25), size=(500,400)):

wx.Frame.__init__(self, parent, id, title, pos, size)

self.panel = wx.Panel(self)

self.box = wx.BoxSizer(wx.VERTICAL)

self.vm = PyoGuiVuMeter(self.panel, nchnls=2)

audioRMS.setFunction(self.vm.setRms)

self.panel.SetSizer(self.box)

self.Show()

app = wx.App()

f = MyFrame(None)

app.MainLoop()

Olivier

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[Tristan SABOURIN]

Thanks a lot for your answer, it works ! Is there a mean to set the max value of the VuMeter ? Thanks

[Olivier Bélanger]

Hi,

I don't think so... You hit the red step when you peak at 0 dB.

Olivier

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[Jonathan Jenkins]

Hello Olivier,

I'm using the RMS object for a VU meter application as well, but have a strange dilemma. It seems the input audio stream is not necessarily bounded from -1 to 1.

I am using my MacBook Pro's microphone input as the input stream. Normally the range of values provided by .get() is between -1 and 1. However, on peaks, the value can spike as high as 15 or more! This is affecting my db calculation as dBFS should never be above 0 for digital sources.

Any insights would be greatly appreciated! I'm trying to make a very accurate meter and don't simply want to toss out erroneous values when encountered.

Regards,

Jonathan

[Olivier Bélanger]

Hi,

Pyo's objects (RMS, PeakAmp, Input, ...) don't limit anything. If the signal coming from your mic is very loud, it surely can be higher than 1 within pyo (a linear amplitude of 15 is just about 6 dB over the limit). If you can't be sure of your signal level beforehand, you can either use a Compress object to limit the signal after the Input, or be more radical and put a Clip(your_signal, -1, 1), but be aware that you'll introduce digital distortion in the signal...

Olivier

To view this discussion on the web visit https://groups.google.com/d/msgid/pyo-discuss/7b882cdc-d038-41b7-9799-59cf29b64ca8n%40googlegroups.com.

[Jonathan Jenkins]

I don’t understand how this is possible in the digital domain. How are the input signals quantized in Pyo? If you have a 16bit audio stream, shouldn’t a sample be represented by a signed 16-bit integer for a total range of 2^16 - 1 values? What are the upper and lower bounds of Input()?

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