From Newsgroup: uk.rec.audio

I bought these Phillips units as I did not want the latency on bluetooth and others. However because they are analogue you can hear distortion at low levels and hiss going up and down. Would this be normal for such devices, or might it be something interfering with the of signal. It has two frequency settings but not much to chose between them.
Brian
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From Newsgroup: uk.rec.audio

On Wed, 19 Oct 2022 09:19:03 +0100, "Brian Gaff"
<brian1gaff@gmail.com> wrote:

I bought these Phillips units as I did not want the latency on bluetooth and >others. However because they are analogue you can hear distortion at low >levels and hiss going up and down. Would this be normal for such devices, or >might it be something interfering with the of signal. It has two frequency >settings but not much to chose between them.
Brian

I'm not familiar with them, but it is possible they use analogue
companding to keep noise levels low. That would account for the
variable noise level. Also in the UK the 800MHz band is very close to
that used by LTE mobile data. That will do unpleasant things to
signals, particularly analogue ones.

Also possibly, of course, this is just what they do.

d
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From Newsgroup: uk.rec.audio

Yes, but this sort of phones has been around for many years. I can in fact pick them up at around 864Mhz, and the frequency sounds quite clear on my scanner. I think they are using a system like fm radio uses, IE a
subcarrier, and that might explain the his and distorted low levels. If you tune any fm station with a weakish signal on a radio its much more noisy
and suffers more from burbles etc. I suspect I'm expecting a little too much from an analogue device. I have heard a very good set of German design, and they apparently use a system similar to the old Nicam tv sound which is digital, and work well, but are pretty expensive.
Brian
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"Don Pearce" <spam@spam.com> wrote in message news:634fb6db.173375@news.eternal-september.org...

On Wed, 19 Oct 2022 09:19:03 +0100, "Brian Gaff"
<brian1gaff@gmail.com> wrote:

I bought these Phillips units as I did not want the latency on bluetooth >>and
others. However because they are analogue you can hear distortion at low >>levels and hiss going up and down. Would this be normal for such devices, >>or
might it be something interfering with the of signal. It has two frequency >>settings but not much to chose between them.
Brian

I'm not familiar with them, but it is possible they use analogue
companding to keep noise levels low. That would account for the
variable noise level. Also in the UK the 800MHz band is very close to
that used by LTE mobile data. That will do unpleasant things to
signals, particularly analogue ones.

Also possibly, of course, this is just what they do.

d

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