Comment on Framework won’t be just a laptop company anymore
xor@lemmy.blahaj.zone 6 months agoWhy not just use type c headphones?
The 3.5mm thing has always baffled me, it feels like complaining your pc doesn’t have a VGA port, except the thing you connect costs like a fiver
Just replace my perfectly good $200 headphones that work in my (old) phone, my Switch, my 3DS, my laptop, my iPod, and my work phone.
It’s so simple!
Seriously, even if you don’t use it, why are you so against others having the choice? The headphone hack was the standard for decades for a reason. If my phone is low on power, I’d like to be able to charge it without disconnecting my music/podcasts…
But like, 3.5 to usbc is a 10 buck conversion. Tbh i see merit in double usb c over usbc and headphone jack, might be more doable too, the DAC prolly takes more space than an additional usbc
A dongle is a workaround. The headphone jacks just works.
I hear you, but a usb-c has more uses than one, the only real problem with a dongle is now is that occasionally you need to charge.
It’s not a work-around, a headphone requires a DAC and an amp. In fact, my phone has a crap DAC causing artifacts in the sound. It’s actually not to my benefit to have the jack because I’d get better sound with the external DAC which is transparent.
So the jack works, but the DAC you get can be whatever the manufacturer considers good enough.
DACs I can hear issues in:
My phone, my tablet, my desktop PC
DACs that are transparent to me:
My laptop, my $12 external DAC
A dongle is a workaround. The headphone jack just works.
Framework also uses a USB-C adapter. It costs 20 Euro: frame.work/products/audio-expansion-card
A dongle is a solution to the problem “I want to use my headphones with a device with only a USB-C port.”
At the time, there weren’t really many good options for replacement devices.
Using the charging port means listening to music and charging at the same time wasn’t possible.
Now we have split-cable dongles for power banks, and we have wireless charging when possible. It’s better but it’s not great; both have downsides, and accessories are more $.
Do they make type C headphones with a powerbank in them? Do I want a lithium battery that large on my head?
There aren’t many upsides for the consumer or the environment. Still seems to me like this isn’t even a lateral move. Internal components have gotten smaller and more efficient since, so that space could be reclaimed. I really don’t need my phone to be that thin, a phono jack next to the charging port would be just fine. The only real downside might be waterproofing but if you can make it work for the type C port…
The only real downside might be waterproofing but if you can make it work for the type C port…
I’ve heard that argument against having a 1/8" TRS port on smartphones before, and I don’t buy it. Yes, there are lots of devices where there’s just air between the connector and the rest of the electronic device…but there is no fundamental requirement imposed that requires devices to be designed like that. It’d be entirely-reasonable to seal it off, have the port external to the rest of the phone, have no way for water to pass from one area to the other.
There are some types of data or electrical connections for which you cannot do that, because there are power connectors and the protocol isn’t designed to handle things being shorted, but that shouldn’t be an issue for 1/8" TRS.
tal@lemmy.today 6 months ago
I can think of several good reasons to use 1/8" TRS headphones (though as I point out in a lower comment, specifically for smartphones, space is at an extreme premium and I think that the majority of people probably don’t want to spend the space on an integrated headphones jack; it’d be better to use a small external adapter there):
But for the general case, not on smartphones, places where I have the space to stick a 1/8" TRS port, I am not very enthusiastic about using USB as an audio port.
1/8" TRS is a well-established standard. I mean, pretty much every device can handle it. USB is in a lot of places, but not at the level of USB.
1/8" TRS has been around forever. It’s electrically-compatible with 1/4" TRS, which has been around even longer.
en.wikipedia.org/wiki/Phone_connector_(audio)
USB is a young pup and already, physical USB-A ports are being phased out in favor of USB-C ports. I very much doubt that USB-C is going to be around ~150 years down the road the way that TRS is.
USB is a lot more complicated than 1/8" TRS. It’s got sleep states, trees, power consumption negotiation. That’s all room for things to break in interesting ways. I have, for example, a USB hygrometer/thermometer that sporadically triggers kernel errors on my computer when plugged in. I have a mouse that, for some reason, when plugged into a USB hub, uses a lower polling rate if plugged in when the system boots up (albeit not if unplugged and replugged). I have a USB audio DAC/ADC that decided to cut out the other day, for God knows what reason. My last computer’s motherboard had a USB controller that supported a more-limited-than-required-by-protocol-USB tree size and had random devices not work if a sufficient number of devices were plugged in.
Security. Same idea. I’ve got enough attack vectors into my devices as-is. People have definitely attacked bugs in USB stacks before; IIRC, that’s historically been part of how they attacked DRM on some consoles. 1/8" TRS is a dumb protocol, but that makes it safe. Same issue with USB for charging, though at least there you can get a “power-only” cable. You can’t have an “audio-safe-only” cable.
USB sticks the DAC on the headphones. Why? Headphones don’t last that long; they’re disposable items. Put the non-disposable bits where they won’t die. A DAC can last pretty much forever. I have gone through many headphones over the years. I have never had a sound card or on-motherboard DAC die. I have two USB-to-1/8"-TRS DAC/ADCs sitting on the shelf by my desk. They’ll probably be perfectly good twenty years from now.
Sampling rate issues. Can’t come up on TRS, because the DAC/ADC is on the device side. One of my USB DACs (this intended for professional audio) only supports a fixed sampling rate, the one at which it does internal processing; that makes sense, as a pro doesn’t want to have some device introducing resampling into their audio chain. Another, consumer one, can’t support a sampling rate as high as the professional one; it relies on the computer to figure out and do resampling if resampling has to happen above that rate. If I have a pair of 1/8" TRS headphones, they work everywhere. It doesn’t matter whether whether they’re new or old or intended for the professional market or consumer market. Plug 'em in, they work.
I have one audio output device – a pair of elderly Logitech USB speakers, not headphones – that has an integrated DAC. For some reason, the engineers who did that appear to have decided to make the volume control on that linear in electrical power rather than in perceptual loudness, which means that the vast majority of the volume scale does very little and there’s a tiny range that has a large impact. I don’t want to deal with that kind of craziness on some cheap pair of headphones.
Latency. 1/8" TRS devices normally – unless you’re intentionally building something into the system – have zero latency, because the DAC on the device is directly electrically driving the membrane on the speaker. Every time one sticks higher-level protocols in, it’s an opportunity for some bright-eyed engineer to start cramming more shit into the pipeline that adds latency. TVs are a great example of this – they used to have no latency, and then someone figured out that they could show ads and do other processing on the feed and that that’d be easier if they had a buffer of some video frames, and so they started inducing latency, unlike a computer monitor. Now you have “gaming modes” on TVs that try to mitigate the problem which had never originally been an actual issue with dumb TVs.
There’s an entirely-separate world of audio software and hardware for professionals who want to do real-time audio processing (on Linux, JACK; I have a USB ADC and some audio cards that permit direct passthrough of input audio to output) to try to avoid all the points in the pipeline that various consumer audio devices and software have inserted latency.
That doesn’t matter for some uses, like an MP3 player. It’s not the end of the world for a phone call. But it’s really obnoxious for some uses. With 1/8" TRS, I have no latency. With USB, I have God-knows-what latency.
There are only three decent reasons that I can see to use USB for the general case:
It provides power. Some people want active noise cancellation on their headsets. If you want to do ANC, you’re gonna need power one way or another. 1/8" TRS doesn’t have a standard for that (with XLR, for condenser mics, there’s a 48 volt phantom power convention that was added, but TRS doesn’t have it). AFAICT, devices that do this with a 1/8" TRS interface either rely on a second USB wire for power or use batteries.
When initially plugging in a 1/8" TRS plug, one shorts connectors and it can make a loud noise on the speaker membrane. Not an issue with USB, because the speaker membrane isn’t in that pipeline.
1/8" TRS doesn’t specify a single impedance everywhere. You can get very-high-impedance headphones that a DAC with limited output power can’t drive at a reasonable volume, even with the volume all the way up. That isn’t usually an issue for most people, but USB avoids the issue.
tal@lemmy.today 6 months ago
Also, regarding the power argument – I’d also add that USB power can be incredibly, mind-bogglingly dirty. I couldn’t believe it the first time I watched some video of some guy with an oscilloscope showing it. I guess it makes sense – I mean, keeps USB controller and hub price cheap – but there’s all kinds of electrical devices that have to deal with it. Anyway, point is, it’s the responsibility of the USB device containing the DAC to have a power supply that cleans that up sufficiently before feeding the DAC. It turns out that…they don’t necessarily do that. I have one USB-powered (not using a USB audio interface, or this wouldn’t be an option) mixer with 1/8" TRS where using the USB power bus off my computer resulted in perceptible audio artifacts.
This appears to be something of a not-uncommon problem, as I see various references to it online.
www.audiosciencereview.com/forum/index.php?thread…
And if I can hear it, then I guarantee that there are USB audio devices that are inserting all kinds of garbage into the signal going out the output.
I wound up avoiding the problem (well, at least to the point where I couldn’t hear it) by sticking it onto a USB charger, not on my PC’s USB tree. Now, yes, you can make a fancy power supply that avoids that, and it’s fair to say that the guys that engineered the mixer should have used a better power supply if they were gonna use USB power. But if you’ve got some guys engineering headphones and are under pressure to try to make the things as cheap as possible, because headphones are a disposable item, not to mention as light as possible because they’re gonna sit on your head, I’m not sure I’d bet on how much expense and weight they’re gonna put into the power supply feeding the DAC.
I haven’t tried quantifying how the power supplies on various USB DACs perform, though I would suggest that in a world where people are using USB audio rather than 1/8" TRS, it’d be interesting to have a device that intentionally screws with the USB input power voltage and then have an oscilloscope or something attached to the leads coming off the magnet driving the speaker’s membrane and see just exactly how much glop from USB power is leaking through to the membrane at various dick-with-the-voltage patterns.
bluetardis@sh.itjust.works 6 months ago
Alas I have but one upvote to give.
iopq@lemmy.world 6 months ago
You forgot that 3.5mm is a stupid connector that makes you pass charged metal pieces over the connector to plug it in. You can’t power an anc chip or a dsp with it because it can’t do power delivery. That’s how you get headphones sounding different based on whether they are turned on
tal@lemmy.today 6 months ago
I have two sections in my above comment talking about power delivery over 1/8" TRS.
Empricorn@feddit.nl 6 months ago
Image