????Also AAC is made for apple device
????Also AAC is made for apple device
OK, "made for" is not accurate, but it's the de facto BT CODEC of apple devices, and some measurments demonstrate that the performance is optimized on Apple devices or at least have a better implementation.????
Unfortunately, some people here have not been able to distinguish between the signal standards of consumer consumer audio equipment and professional audio equipment.Is this a Denon dn-200r review or another advertisement for Topping? I can't tell.
There's twice as many Topping D70 measurements in this 'Denon' review than Denon measurements.
Good because there was no attempt to advertise Topping. I post those as I noted: without a reference it was impossible to know if the SINAD was good or bad. And without LDAC test, you can't tell how much of that is due to the codec. Also, recently there has been requests to test the bluetooth on newer DACs so I thought I show that and demonstrate that nothing is changed with respect to BT.Is this a Denon dn-200r review or another advertisement for Topping? I can't tell.
SBC could be much better with some proper configuration:I don't think the following statement is correct: "The unit only advertised SBC codec which is better than aptX but not as good as LDAC."
SBC clearly stands at the bottom of the foodchain as far as Bluetooth codecs are concerned. AFAIK, the order is from worst to best SBC < AAC < AptX < LDAC.
Bluetooth Codecs: The Ultimate Guide (2024)
How are Bluetooth codecs different? Which is the best for audio quality or latency? And how to change it on your device.headphonesaddict.com
Understanding Bluetooth codecs
Want to know more about wireless audio? Take our crash course in Bluetooth codecs, bitrate, standards, and uses from SBC to LDAC and more.www.soundguys.com
You wanted to say was Apple does the best AAC decoder in the market.OK, "made for" is not accurate, but it's the de facto BT CODEC of apple devices, and some measurments demonstrate that the performance is optimized on Apple devices or at least have a better implementation.
AAC was developed with the cooperation and contributions of companies including Bell Labs, Fraunhofer IIS, Dolby Laboratories, LG Electronics, NEC, NTT Docomo, Panasonic, Sony Corporation,[1] ETRI, JVC Kenwood, Philips, Microsoft, and NTT.[15] It was officially declared an international standard by the Moving Picture Experts Group in April 1997.
I did not say that apple made the best decoder in the market. Not sure where you got that. Yes thanks for telling me who developped it. But you already said so on a previous post. An I already admitted that, it was not specifically made for Apple.You wanted to say was Apple does the best AAC decoder in the market.
Apple was not even part of the development team. Back in 1997 Apple's CEO was Gilbert Amelio, they were about the buy Next and Steve to make a come back. I don't think they had any resources to affect an international standard. Besides, Apple had no products that utilize AAC for the next four years.
Advanced Audio Coding - Wikipedia
en.wikipedia.org
Really John, I am doing extra work here and you are complaining about that?
I realise that. I was being sarcastic as it seems from reading various comments that Apple devices perform better.I did not say that apple made the best decoder in the market.
I am pretty sure there is no such optimization on Apple platform. Every AAC file is decoded first, then re-encoded into AAC at lower quality due to its real-time nature. It was an error on their part thinking that forcing AAC into a BT device helps them in some ways. Architecturally that just doesn't work since the OS has to mix output from multiple apps so everything has to be decoded first anyway. As I noted earlier, I tested AAC on a Mac and it had the same problem with BT that Android etc. show.Bluetooth has the perfect opportunities to optimise how the AAC codec works between 2 of their devices as there is a negiotation phase. I did briefly do a bluetooth network capture (because I am interested in this type of thing) and I could see significantly different packets between my AirPods Pro and a MacBook (where I was running the network capture) and a non-Apple bluetooth device with AAC enabled and the same MacBook.
I have yet to see this implementation. Who has it?Amirn You really should test aptxHD and adaptive since they are current codecses.
Cheers!
What is sort of different with 2 apple devices connected via bluetooth is that Apple open a second LE bluetooth connection at the same time as the primary bluetooth connection. This connection is used effectively as a control channel with lots of proprietary apple messages (often marketed as 'continuity' , some of these have been decrypted a few years ago e.g.I am pretty sure there is no such optimization on Apple platform. Every AAC file is decoded first, then re-encoded into AAC at lower quality due to its real-time nature. It was an error on their part thinking that forcing AAC into a BT device helps them in some ways. Architecturally that just doesn't work since the OS has to mix output from multiple apps so everything has to be decoded first anyway. As I noted earlier, I tested AAC on a Mac and it had the same problem with BT that Android etc. show.
Not to doubt @amirm, but both products shown in the review exhibit the same distortion at those two frequencies (when using SBC) so it seems to be the case.They are artifacts created by SBC. I have not studied its algorithm to know why it generates those.