No more dangly headphone wires

[Tinworm]

well, thank you all for your advice about low latency. I now have a really comfy pair of KYGO over-ear headphones (£29.99) and an MPOW BH390A bluetooth transmitter (£13.49) and I have done a quick test with my detector and I am getting really positive, no-delay wireless signals.

Problem solved for £43.48

I also got a cheap pair of on-ear, low latency headphones for a friend to come along

[DiggaDave]

Oh my goodness, can someone put the above into laymans terms - I am a complete techno- phobe and a bit of a luddite when it comes to business end of the technology involved.
So I have a vanquish 540 and a pair of "ordinary" blue tooth headphones.
All seems to be working ok and I have found a couple of nice things but I'm not that confident in what I am doing.
It seems from what you are all saying that the BTooth headphones have to be compatable - is that correct and how would I know if they are.....?
Many thanks
DD.

[Tinworm]

Hi DD
I think I can help, because I started this thread thinking I'd been rather clever, but learned from others here, almost immediately, that my solution would not work.

My metal detector does not have a Bluetooth facility. It does not transmit wireless signals. But I was aware that you can get small transmitters that plug into a headphone socket. The signals they send are picked up by a Bluetooth headset.

What people pointed out, however, is that ordinary bluetooth involves a delay. You will notice this when watching TV with a headset on (so that you can watch TV without disturbing someone doing something else). You will notice that the sound and lip movements won't sync, rather like watching bad dubbing.

The reason this matters to us is that if there is a delay in receiving a signal, we will hear the target sound "after" our detector head has swept over it, making it hard to pinpoint the actual location of the treasure.

People pointed out that what I needed was a transmitter incorporating a sophisticated algorithm called aptX (audio processing technology), which compresses the audio code so that it can be received in near real-time by aptX headphones. When searching for the kit online it is described as "low latency". It is important that both the transmitter (dongle) and the headphones have the low latency technology to work. Ordinary bluetooth headphones won't work.

[Fusion]

Quote:"People pointed out that what I needed was a transmitter incorporating a sophisticated algorithm called aptX (audio processing technology), which compresses the audio code so that it can be received in near real-time by aptX headphones"

I have to point out that "AptX" alone is not sufficient.
There are several variants that Qualcomm have devised:
aptX ( the regular type ) ; aptX-Low Latency (aptX-LL) ; aptX-HD ( super-fi quality ) ; aptX-adaptive; because one is not confusing enough for the end consumer ....
https://www.aptx.com/which-aptx

So you need to ensure transmitter and receiver are aptX-LL to get the benefit of the low lag ( approx 40 msec, they state )

[Nerdy bit: they are not really 'transmitter' and 'receiver', both ends are bidirectional, they chat back and forth between each other.]

[DiggaDave]

Aaaah thanks Tinworm that's some relief. I can just about take in what you are trying to do now and I wish you well.
I'll leave you and Fusion to discuss the matter in peace in that foreign language that you speak!
Thanks again and good hunting.
DD

[Tinworm]

Hi Fusion, so are you saying what I plan on using is not going to work; that I STILL haven't solved it?

I despair!

I won't spend any more. I will just revert to danglies, if necessary.

I did test out the system on a few coins and it did seem to locate in real-time.

[DannyNorfolk]

Hi Fusion, so are you saying what I plan on using is not going to work; that I STILL haven't solved it?

I despair!

I won't spend any more. I will just revert to danglies, if necessary.

I did test out the system on a few coins and it did seem to locate in real-time.

If your headphones and the transmitter both support aptx low latency, you're good to go.

[ChasC]

The August MR250 Bluetooth transmitter should be perfect for your requirements. Just Google August MR250 as they are widely available on the internet.

[Tinworm]

If your headphones and the transmitter both support aptx low latency, you're good to go.

But are you saying it is possible to have aptX which is not low latency?

[frogfoot]

But are you saying it is possible to have aptX which is not low latency?

Yes, aptX comes in several 'flavours'
Original aptX - high latency, quite good audio
aptX HD - hi quality audio but still high latency )
aptX LL - low latency, good for TV and Detecting, not so good for music
aptX Adaptive - high quality audio and supports low latency, Good for all use cases.
One thing to note is that your headphones must support the required aptX codec as well as the transmitter, or it will use the best available codec supported by both codec.

Tom

[Tinworm]

Thanks Tom
what about aptX "AAC"?

[frogfoot]

Thanks Tom
what about aptX "AAC"?

AAC is not aptX, aptX and all of its subtypes are Qualcom codecs, AAC is an Apple codec, it works well on Apple devices but can be very poor on non Apple kit.

SBC it the lowest, most basic codec, all Bluetooth device must support it, but is is very old and not vary good by todays standard.

LDAC is a Sony codec and very power hungry, very good quality for music but I think the latency is quite high.

[Tinworm]

cheers
this headset and TX that I got said they were each low latency and aptX.

On the box the headphones say "sound quality: AAC and aptX codec"

and as I say, I tested them out on lip-syncing with TV and there was no delay, and there seemed to be no delay on the detector