# HG changeset patch # User Mychaela Falconia # Date 1672349093 0 # Node ID 3ed4f53c6092641c08186a6c34a15edacb59ef11 # Parent 7077d02ed3b10a5d38f28ad8302a20337047e05d doc/Host-tools-overview: update fc-tch2fr bogon description diff -r 7077d02ed3b1 -r 3ed4f53c6092 doc/Host-tools-overview --- a/doc/Host-tools-overview Thu Dec 29 21:15:36 2022 +0000 +++ b/doc/Host-tools-overview Thu Dec 29 21:24:53 2022 +0000 @@ -249,9 +249,13 @@ inside Calypso devices. fc-tch2fr This hack-utility takes a TCH downlink recording produced with - the tch record command in fc-shell and converts it to a playable - libgsm file which will most likely contain some garbage by - disregarding the non-understood DSP status words; see the + the tch record command in fc-shell (specifically, the old format + that will only be produced if the source of TCH DL bits is a + very old FC firmware version) and tries to convert it to a + playable libgsm file (containing garbage frames in reality, + resulting in very unpleasant noises on subsequent decoding) by + completely disregarding the DSP status words which were not + understood back when this hack was written in 2016. See our TCH-bit-access article for more information. fc-tmsh TI-based GSM firmwares provide a rich set of Test Mode commands