Rockbox General > Rockbox General Discussion

FM Mono on Sansa e250?

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bertrik:
A nice feature I've seen on the another fm chip (si470x) is that it reduces the stereo width as signal strength decreases (and starts turning down the volume as the received signal strength drops further). So instead of fully mono or stereo, there is a more gradual transition between stereo and mono, depending on the received signal strength.

The lv24000 chip in the e200 series cannot do this automatically, but it does allow setting the stereo width in 8 steps. Maybe the stereo width algorithm could be implemented in software for this chip.

Chronon:
That would be a nice feature.

donp:
Another technique, first done by Carver, I think, is to low-pass the separation signal.  SO it reduces a lot of HF noise without affecting the sound stage that much.

On the "summit" post:
One real reception killer is lamps with "touch" switches.

Generally the tiny radios (including DAP's) use the earphones as an antenna.  Different phones will perform differently as antennas, esp regarding L and R wires being split, or shielding in the wire.

My Sansa with a cassette tape adapter actually receives pretty well in my car.

Chronon:
If someone wants to suggest some of these ideas, they should be posted to the Feature Ideas forum.

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