minimum 5.5mm^2 is required, so we are talking about 3575 euros here. Besides, it is very rare that you can get a production grade chip on the first try, bug happens all the time, you might need 2 or 3 or even more tries to get a working product.
the devil is in the DAC and ADC. You just can't turn 16bit/24bit data directly to/from analog without much loss. The 1/65536 accuracy voltage divider simply don't exist.
So, you have to up-sample the songs to high rates with less bits, like 1bit to 6bits, then do the conversion, and get the best SNR you can.
In this sense, there's simply a lot of advantage of using 24/196 since the above conversion can result in less loss and higher SNR
There's a big difference in impulse response with different sample rates, any one can see it on a oscilloscope, I bet some one can hear the difference.
If humans were able to hear audio above 22kHz (or what not) in any meaningful way, we'd expect to be be able to demonstrate that effect in carefully controlled studied and then that lack of low-passing may matter; but that isn't what the best evidence so far shows.
The low-passing with a brick wall filter on 44.1KHz audio can be a bad thing sometimes, for example, pre-echo
https://en.wikipedia.org/wiki/Pre-echo
You won't hear the pre-echo on a 2.8MHz DSD audio.
In the real world, it is almost impossible to make a voltage divider with 24bit resolution. So all the DAC makers have to convert 24bit audio into lower bits(6bits to 1bits), this step requires oversampling the original audio. It is a lot easier to oversample a 192KHz/24bit audio than a 44.1K/24bit audio, and the ringing is much less after oversampling the 192KHz/24bit audio.
the point of using number in the domain is, a lot of Chinese people don't know letters, they don't know English words and they can't get "PinYin"(using letters to represent Chinese words) right. How do you make these people type urls in the browser? well, luckily, they all know numbers!
Are there really computer-literate Mandarin speakers in China who don't know pinyin? How do they input text? The only serious non-pinyin IMEs I'm aware of are the bopomofo ones for traditional characters in Taiwan.
Mandarin speakers in some parts of China speak their Mandarin differently, so can't remember the exact pinyin. E.g. around Wuhan people can't remember whether a word ends with -ang or -an, similarly with -eng and -en. As a foreigner, I can't remember nu and nv, similarly lu and lv. Beijingers have trouble with -r endings.
many older people like my dad, don't know pinyin well. he doesn't input texts, but he browses web sites. He uses a default home pages full of links to start exploring the web.
Here's what I want: A cheap text ssh terminal with wifi,or cellular, nice keyboard hardware, with extremely long battery life (or solar powered), which i can just throw it in my car and forget it. Whenever I am away of my computer I can always log in to my cloud server and write codes or do some quick fixes.
This should be possible with a Kindle. The basic Kindle costs $50 or so. And it is a fork of Android. And has a month of battery life. There are some Kindle-roots [Search "root a kindle"]. Would something like this work for you? The keyboard will still be the kindle-keyboard.
The other option is a cheap ipad with a bluetooth keyboard. If you turn off all the unnecessary apps and notifications and put it on airplane mode - it should last a couple of weeks. You turn it on only when you need it. You will still need to get an ssh app [many available].
Most modern smartphones do not hace physical keyboard, and my Kindle has spoiled me to think that anything less than a month is not “long battery life”.
I've been using taobao intensively for our business for quite a long time. we are a hardware start-up, we bought components from taobao, make, assemble PCB prototypes from taobao, It's so much better than ebay, for example, they have a IM client for you to chat with the seller, negotiate price and shipping cost in real time, and once the deal is made, they can change the price instantly for you.
There also sites that buy taobao things for you and ship them to the US, so all you need is a paypal account or a credit card, and the ability to read Chinese.
This kind of work is OK for some simple block level circuit designs. In the real world designs, as circuits grow complicated, and parasitics add in, the SPICE convergence issue kicks in and automation becomes difficult.
In a way, do all these different side effects make automation even more important? Modeling them doesn't sound easy, but I would imagine that our mental capacity for evaluating solutions is the real bottleneck here.
I think even if you don't account for all of the side effects, you can still use these tools to develop useful circuits which you can then use to design real-world circuits.
