earphones and microphones

[RichD]

Every earphone manufactured nowadays (the type that inserts
into the ear canal), seems to have a mic built into the cord.

I'm looking for a set for music only, not phone use.
I figure, the in-line mic must introduce distortion.
But I'm not sure, maybe it's filtered or bypassed below
perception level. What do they look like, internally?


--
Rich

 

[Jasen Betts]

On 2020-02-04, RichD <r_delaney2001@yahoo.com> wrote:

Every earphone manufactured nowadays (the type that inserts
into the ear canal), seems to have a mic built into the cord.

I'm looking for a set for music only, not phone use.
I figure, the in-line mic must introduce distortion.
But I'm not sure, maybe it's filtered or bypassed below
perception level. What do they look like, internally?

it's a TRRS plug, The mic connects to the second ring terminal which is not used
for the noise-making circuits


--
Jasen.

 

On Tuesday, 4 February 2020 04:56:10 UTC, RichD wrote:

Every earphone manufactured nowadays (the type that inserts
into the ear canal), seems to have a mic built into the cord.

I'm looking for a set for music only, not phone use.
I figure, the in-line mic must introduce distortion.

the mic has no effect on headphone use.

NT

 

[RichD]

On February 3, Jasen Betts wrote:

Every earphone manufactured nowadays (the type that inserts
into the ear canal), seems to have a mic built into the cord.
I'm looking for a set for music only, not phone use.
I figure, the in-line mic must introduce distortion.
But I'm not sure, maybe it's filtered or bypassed below
perception level. What do they look like, internally?

it's a TRRS plug, The mic connects to the second ring terminal
which is not used for the noise-making circuits

um, can you translate that into English?

--
Rich

 

[amdx]

On 2/4/2020 5:12 PM, RichD wrote:

On February 3, Jasen Betts wrote:
Every earphone manufactured nowadays (the type that inserts
into the ear canal), seems to have a mic built into the cord.
I'm looking for a set for music only, not phone use.
I figure, the in-line mic must introduce distortion.
But I'm not sure, maybe it's filtered or bypassed below
perception level. What do they look like, internally?

it's a TRRS plug, The mic connects to the second ring terminal
which is not used for the noise-making circuits

um, can you translate that into English?

--
Rich

He said,
It doesn't add noise or distortion.

Mikek

 

[Dave Platt]

In article <8194b8a1-37ca-4097-ab62-34d6a669f530@googlegroups.com>,
RichD <r_delaney2001@yahoo.com> wrote:

it's a TRRS plug, The mic connects to the second ring terminal
which is not used for the noise-making circuits

um, can you translate that into English?

Tip, Ring, Ring, Sleeve.

The sleeve (closest to the connecting wire) is common ("ground").

The tip, and the ring closes to the tip, are the two audio-out
channels (earphones). The connected device drives audio to them,
against ground.

The second ring (closest to the sleeve) serves the microphone, and (in
a lot of cases) a single push-button which acts as a control.
Typically, the ring goes to an electret microphone (whose second
terminal is connected to the sleeve/common/ground). If there's a
pushbutton, it's connected across the microphone (between ring-2 and
ground) and shorts the two together when pressed. The connected
device will typically provide a bias voltage to this connector
(e.g. +5 volts DC, through a series resistor), and also
capacitor-couples the connector to a microphone-preamp circuit. The
device often monitors the DC voltage on this connector to detect cases
when the pushbutton is pressed.

So, the microphone circuit in the 'buds has very little impact on the
earphone audio quality, because all they share is the common/ground
wiring. The "hot" audio signals don't reach the microphone at all.