'HD' audio web stream - why is Radio 3 setting levels so low??

[johnb]

Elion,

You might be interested in these threads:

Prom 1 - HD Sound Severely Limited/Clipped

BBC Reply to complaint about limiting on Prom 1 sound

The excessing limiting (during the music only) was almost certainly a test run for the Havergal Brian Prom a few days later, where the same thing happened.

[Elion]

Elion,

You might be interested in these threads:

Prom 1 - HD Sound Severely Limited/Clipped

BBC Reply to complaint about limiting on Prom 1 sound

The excessing limiting (during the music only) was almost certainly a test run for the Havergal Brian Prom a few days later, where the same thing happened.

Thank you for pointing this out - I hadn't been aware of either thread. Depressing that the BBC should be incompetent and/or disingenuous in their response (when the facts are undeniable from the various dB graphs). I assume no further response has been received from the BBC on this?

Elion

[Bryn]

Bryn - sorry to mention this in the public forum but I didn't receive a reply to the second e-mail that I sent you on 10.8; I did receive an initial reply to my first e-mail but then my second e-mail (which was sent to both the e-mail address you gave me and as a PM to you at Radio 3 forums) didn't draw a response. Doubtless various gremlins got involved. But I now have something that I'd like to send you and that I think you might find of interest - a screen shot that establishes beyond any doubt that Radio 3 were applying hard limiting at -11dB in the Liszt 2 in the First Night Prom (so you were entirely right about this). You may want to use this screen shot (which derives from some respected software) to send to the BBC - I don't see how they could argue with such evidence, and would then need to explain why they saw fit to apply hard limiting at -11dB to the HD AAC/320kbps broadcast stream on that occasion.

Elion

Sorry Elion, somehow I missed you email and message at the time. I have just found and read it. I think it might be useful for you to post the comments on the aac codec and the levels it 'expects' to deal with here. I was certainly not aware of the important issues you raised in that message. I would be most grateful if you were able to reference the information. It appears to be something that the iPlayer team need to be challenged on.