hi,all

1. I have tried the nero HE-AAC encoder with nero burning ROM version 6.3.16.

2. It can only provide low bitrate HEAAC encoding: stereo VBR 50-70kbps and stereo CBR xx-80kbps. (if you set a higher bitrate, it switch to AAC-LC mode).

3. if castenats.wav(stereo) is coded by HE-AAC at any bitrate, pre-echo artifacts is quite easy to be listened;
if a mono castenats.wav is coded by HE-AAC at the bitrate which nero can work,
the audio quality is worse too.

My queistion:
1. Can I encode a wave file at higher bitrate with nero HE-AAC(for stereo)?
2. Can I set up a bit rate for mono file with HE-AAC?

Best regards.

HE aac is useful on bitrates < 96 Kbit, that's why NERO encoder automatically switches to LC on higher bitrates...

perhaps.

But i think the relult of nero HE-AAC at non-selective bitrate for mono file provide a poor quality, thus I hope I can set a fitable bitrate for compressing a mono file with a good quality.

how about <=128kbps for stereo mode and <=64 or <=80 kbps for mono(HE-AAC)?


Best regards.

New version of Nero Digital Audio will have improved SBR part, and a new "downsampled SBR" coding mode which will allow HE-AAC to be used up to 128 Kb/s.

Advantage of the downsampled SBR is two times bigger temporal resolution, which will clear out problems with pre-echo that you noticed.

>>New version of Nero Digital Audio will have improved SBR part, and a new "downsampled SBR" coding mode which will allow HE-AAC to be used up to 128 Kb/s.
Sounds interesting.
Just curious, will such a HE AAC encode (downsampled SBR, 128 Kbit) be better than 128 Kbit LC AAC ?
And may I ask to include 8Kbit bitrate settings for mono streams ?
Now I can encode stereo at 16Kbit, but mono file is to be encoded at 16KBit also (minimum setting)...
This can be useful with speach encodes...

EDIT: a bit of text added.

Listening tests are still being done - I can't say - theoretically you'd only get bandwidth - 22 instead of 16 kHz lowpass - and it shouldn't affect lowband quality too much as the base bit rate is only few kb/s less.



Ok, will do.

IVAN:

as if HE-AAC in nero doesnot take full advantage of SBR capability as mpeg standard, it does some canstant parameters as I know at present:

1. a FIXFIX mode for TF grid
2. a fixed sbr header parameters for each audio file, non-adaptive for each frame.

right?

Best regards.

So, Roberto would have one more candidate for 128Kbit listening test soon !


Thanks a lot !!!

I don't think so. It would be very interesting to test this encoding method, I really want to see what people who can hear especially high frequencies think of it, but I think the only AAC encoder that Roberto will test is going to be iTunes, as it was the winner of the latest 128kbit AAC test (and the previous one, too).

Yep
It is already a whole bunch of codecs to be tested.
But I hope, this will not be last 128Kbit listening test !!

Right. It wouldn't be fair to give AAC (as a format) twice the chances to win.

Besides, testing 7 codecs at 128kbps would be painful.



Well, it'll be the last one from me, for the foreseeable future