Home |
Search |
Today's Posts |
#41
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
|
#43
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
In article
, says... "Robert Orban" wrote in message - west.giganews.com In article - west.giganews.com, says... In article Gd- , says... I think that this computer may have some problems with DC offsets in the digital domain. Some of the Orban metering code might not ignore them. The meter doesn't block DC. That gives most accurate peak indications because AC coupling introduces tilt into the waveform unless the cutoff frequency is lower than around 0.15 Hz. Moreover, if the meter blocked DC and there was substantial DC on the audio, the meter would not detect clipping due to the asymmetry. ...that being said, both loudness meters block DC because of the highpass part of their equal-loudness contour weighting filters. It is the VU and PPM meters that do not block DC. I would argue that the reasons for not blocking DC apply equally to all 4 meters. If it is OK to block DC for two of them, then it is OK for all of them. Ther are good reasons for blocking DC to the loudness meters because the ear does not responds to DC, so DC las no loudness level. However, the PPM, absolute peak, and VU meters are level meters. The insidious thing about blocking DC to peak level meters is that you no longer see the correct values of the digital samples so you can't detect clipping accurately. |
#44
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
On Sat, 12 Apr 2008 11:41:58 -0800, Robert Orban
wrote: In article , says... On Fri, 11 Apr 2008 11:33:40 -0800, Robert Orban wrote: In article , says... On Fri, 11 Apr 2008 06:52:15 -0400, "Arny Krueger" wrote: "Robert Orban" wrote in message - west.giganews.com The software accepts two-channel stereo inputs. The VU and PPM meters are split to indicate the left and right channels. The PPM meter also displays the instantaneous peak values of the L and R digital samples. When I started the program, the Vu and PPM meters started reading mid-scale and full-scale respectively, with no music playing. This seems counter-intuitive. Works as expected for me. my only issue is that the PPM isn't scaled as a normal PPM. I spent some time soul-searching about the issue of scales and finally chose to put all of the meters on identical scales to make it easier for users to compare the meters. In future version, we may make scales a user-definable parameter. Bob Orban Can you explain a little more about the variable gain/sensitivity controls available for a couple of the scales? I'm not really too sure how one should be using those. Because the scales are all -30 to 0 dBfs, setup is really somewhat arbitrary. If you set the VU Gain to +10 dB, the VU meter will indicate the same as the peak meter on a sinewave. (We sill probably change this is the next revision so that that this will happen with the VU Gain set to 0.) As for the CBS loudness meter, there was never an "official" calibration published. As stated in the readme, if I want to compare it with the BS.1770 meter, I set the CBS gain to +7 dB if I want to compare the peak excursions of the meter wit BS.1770 and to +10 if I want to compare the experimental long-term CBS loudness to BS.1770. OK. here is what I get. Generate a tone at -18dB in Audition, and it shows -14dB on both VU and PPM, with VU gain set to 10dB. Is that what you would expect? BS 1770 also shows roughly -14dB, and I can make CBS match that if I wind its gain up to 18dB. I am going to try some loudness testing later. I will choose several different music types and change their amplitudes until they are subjectively as loud as each other. Then I will see how the CBS and BS.1770 respond. I presume the tell-tale left behind by the CBS is roughly equivalent to the main bar of the BS1770? d -- d |
#45
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
Our developer is actively working on bug reports and contacting
users who report them. This is hard for USENET posts because many people use phony email addresses to foil spambots. In addition to posting them here, please send bug reports to the email address on the Settings page of the meter. (It's also in the readme.) Bob Orban |
#46
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
|
#47
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
On Sat, 12 Apr 2008 23:38:59 -0800, Robert Orban
wrote: OK. here is what I get. Generate a tone at -18dB in Audition, and it shows -14dB on both VU and PPM, with VU gain set to 10dB. Is that what you would expect? I would expect a sinewave peaking at 0 dBfs to indicate 0 on the loudness meter's PPM and absolute peak meter. I would also expect the VU meter to read 0 dB when its gain is set for +10 dB. Because this is admittedly confusing, the next release will be modified so that when the VU gain is set to 0 dB, the VU meter agrees with the PPM and absolute peak when fed with a sinewave. No, I definitely see a 4dB discrepancy between peak sine wave level and the indications on PPM and VU (+10). The meters read higher than the actual signal level. The sound card is an M-Audio Audiophile 2496 if that is any help. See this screen shot for the situation CBS loudness gain is +18, VU meter gain is +10. http://81.174.169.10/odds/orbanppm.gif -- d |
#48
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
In article ,
says... On Sat, 12 Apr 2008 23:38:59 -0800, Robert Orban wrote: OK. here is what I get. Generate a tone at -18dB in Audition, and it shows -14dB on both VU and PPM, with VU gain set to 10dB. Is that what you would expect? I would expect a sinewave peaking at 0 dBfs to indicate 0 on the loudness meter's PPM and absolute peak meter. I would also expect the VU meter to read 0 dB when its gain is set for +10 dB. Because this is admittedly confusing, the next release will be modified so that when the VU gain is set to 0 dB, the VU meter agrees with the PPM and absolute peak when fed with a sinewave. No, I definitely see a 4dB discrepancy between peak sine wave level and the indications on PPM and VU (+10). The meters read higher than the actual signal level. The sound card is an M-Audio Audiophile 2496 if that is any help. See this screen shot for the situation CBS loudness gain is +18, VU meter gain is +10. http://81.174.169.10/odds/orbanppm.gif I will investigate this. My first guess is that the 4 dB you are seeing is actually 3.922 dB [20 log10 (2/pi)], which is the difference between the peak and average value of a sinewave. If I recall correctly, Audition allows you to scale levels according to the peak or average value of a sinewave, so this is what I would investigate. |
#49
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
On Apr 11, 2:33 pm, Robert Orban wrote:
In article , says... On Fri, 11 Apr 2008 06:52:15 -0400, "Arny Krueger" wrote: "Robert Orban" wrote in message - west.giganews.com The software accepts two-channel stereo inputs. The VU and PPM meters are split to indicate the left and right channels. The PPM meter also displays the instantaneous peak values of the L and R digital samples. When I started the program, the Vu and PPM meters started reading mid-scale and full-scale respectively, with no music playing. This seems counter-intuitive. Works as expected for me. my only issue is that the PPM isn't scaled as a normal PPM. I spent some time soul-searching about the issue of scales and finally chose to put all of the meters on identical scales to make it easier for users to compare the meters. In future version, we may make scales a user-definable parameter. Bob Orban Hey a couple more suggestions: Add sensitivity to the list, and possibly a compensating EQ setting to get it flat with a known measurement mic. Add ASIO drivers to your support list too, I dont know too many serious audio users who use anything else most of the time. |
#50
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
The first update is now available.
Version 1.0.1: --Reduces CPU load caused by refreshing the meter’s display. This allows slower computers to operate at the meter’s maximum 100 Hz refresh rate, minimizing flicker. --Changes the color scheme to improve appearance and to make the meters easier to read. --Changes the graphic design of the single-bar meter display elements like peak hold to make them easier to read and to prevent them from being obscured. --On startup, checks whether the computer’s CPU supports the SSE2 instruction set and exits gracefully if it does not. --Increases the gain of the VU meter by 10 dB for a given setting of the VU Meter Gain control. When the control is set to 0 dB and the meter is fed by a sinewave, the VU meter will now display the same level as the absolute peak meter. --Clarifies the readme to better explain how the meter interacts with your computer’s sound device(s). --Moves the Audio Input selector to the Settings page. The update is available he http://www.orban.com/meter/ |
#51
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
Robert Orban wrote: The first update is now available. Version 1.0.1: --Reduces CPU load caused by refreshing the meter’s display. This allows slower computers to operate at the meter’s maximum 100 Hz refresh rate, minimizing flicker. --Changes the color scheme to improve appearance and to make the meters easier to read. --Changes the graphic design of the single-bar meter display elements like peak hold to make them easier to read and to prevent them from being obscured. --On startup, checks whether the computer’s CPU supports the SSE2 instruction set and exits gracefully if it does not. --Increases the gain of the VU meter by 10 dB for a given setting of the VU Meter Gain control. When the control is set to 0 dB and the meter is fed by a sinewave, the VU meter will now display the same level as the absolute peak meter. --Clarifies the readme to better explain how the meter interacts with your computer’s sound device(s). --Moves the Audio Input selector to the Settings page. The update is available he http://www.orban.com/meter/ Excellent. That now behaves exactly as I would like a meter set to. It is, as you say, useful to have all the meters scaled the same way, but as the PPM is at the bottom of the stack, perhaps you could add a selectable set of normal PPM scales *below* that meter. d |
#52
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
Robert Orban wrote: The first update is now available. Version 1.0.1: --Reduces CPU load caused by refreshing the meter’s display. This allows slower computers to operate at the meter’s maximum 100 Hz refresh rate, minimizing flicker. --Changes the color scheme to improve appearance and to make the meters easier to read. --Changes the graphic design of the single-bar meter display elements like peak hold to make them easier to read and to prevent them from being obscured. --On startup, checks whether the computer’s CPU supports the SSE2 instruction set and exits gracefully if it does not. --Increases the gain of the VU meter by 10 dB for a given setting of the VU Meter Gain control. When the control is set to 0 dB and the meter is fed by a sinewave, the VU meter will now display the same level as the absolute peak meter. --Clarifies the readme to better explain how the meter interacts with your computer’s sound device(s). --Moves the Audio Input selector to the Settings page. The update is available he http://www.orban.com/meter/ And something I forgot. Get rid of the Start/Stop button. Just stop the meters when choosing the settings tab, and restart when returning. d |
#53
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
|
#54
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
Robert Orban wrote: In article ao2dncaCm7psWIvVRVnygwA@plusnet, says... And something I forgot. Get rid of the Start/Stop button. Just stop the meters when choosing the settings tab, and restart when returning. The Start/Stop button is useful for two things: 1. The meter must be stopped for certain settings to be changed, mainly the integration time for the CBS and BS.1770 meters. Doing this on the fly is tricky because the integrators weight all samples equally within the time window, so there is no natural exponential decay for bogus samples that get into the integrator. It's safest just to flush the integrators and set all samples to zero when the integration time is changed. 2. The meter can be to compute the long-term loudness of program elements up to 10 seconds in length. Doing this correctly requires starting the meter at the same time that the program element starts. Bob Orban OK, but you what is wrong with just automatically stopping the meters when you hit the settings tab? I can't see that what you say, while it is clearly correct, has any bearing on this. Now, how about the little boxes for individual instruments. When you remove the cross to disable, the meter just sits wherever it was when you hit the button. Much better to remove the bar and max telltales. d |
#55
Posted to rec.audio.tech,alt.radio.digital,rec.audio.pro,alt.radio.broadcasting
|
|||
|
|||
free Orban loudness meter app now available
In article 0eydncwpV7-CFIrVnZ2dnUVZ8qugnZ2d@plusnet,
says... Now, how about the little boxes for individual instruments. When you remove the cross to disable, the meter just sits wherever it was when you hit the button. Much better to remove the bar and max telltales. I agree. We made this change in v 1.02. |
Reply |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
free Orban loudness meter app now available | Pro Audio | |||
Radio Shack SPL meter ok to estimate acoustic listening room loudness? | Pro Audio | |||
video: I Want to Break Free from Loudness War | Audio Opinions | |||
video: I Want to Break Free from Loudness War | Pro Audio | |||
My mixes, loudness, and the spectrum meter | Pro Audio |