FU
I know your probably not serious about your last comment, but it's nothing to do with reception. Bad reception does not cause these compression problems.
Sorry fusionlad, I think you've been misinformed there.
Yes, reception problems CAN increase compression artefacts.
MPEG and other compressed systems (and even uncompressed ones like CD Audio) have a certain amount of 'error correction' tolerance built-in. This means that when the signal gets corrupted, the machine will work harder to uncorrupt the higher (more significant) bits of the digital word rather than even attempt to decode the lower (least significant) bits. On dirty CDs this manifests itself as a slight 'clicky' or 'bristly' edge to the sound, whereas on MPEG video this will manifest itself as appearing to have been compressed more - simply because the more significant parts of the image (i.e. the larger blocks) are being decoded (with trouble) and the receiver's processor doesn't have the time/stable enough signal to fill in the details.
That's a different problem mate. When there are reception problems, you git picture freezing etc. I say again, bad reception does not give you the sort of artifacts we are talking about here.
fusionlad
Founding member
Mark Boulton posted:
fusionlad posted:
chrisb posted:
I agree, I think since about two weeks ago the compression is more noticable than ever. The colder weather perhaps, making our aerials shrink?
I know your probably not serious about your last comment, but it's nothing to do with reception. Bad reception does not cause these compression problems.
Sorry fusionlad, I think you've been misinformed there.
Yes, reception problems CAN increase compression artefacts.
MPEG and other compressed systems (and even uncompressed ones like CD Audio) have a certain amount of 'error correction' tolerance built-in. This means that when the signal gets corrupted, the machine will work harder to uncorrupt the higher (more significant) bits of the digital word rather than even attempt to decode the lower (least significant) bits. On dirty CDs this manifests itself as a slight 'clicky' or 'bristly' edge to the sound, whereas on MPEG video this will manifest itself as appearing to have been compressed more - simply because the more significant parts of the image (i.e. the larger blocks) are being decoded (with trouble) and the receiver's processor doesn't have the time/stable enough signal to fill in the details.
That's a different problem mate. When there are reception problems, you git picture freezing etc. I say again, bad reception does not give you the sort of artifacts we are talking about here.