POCSAG: is ecd() detecting non-errors?

[Teddyz]

I use the ecd()-function in an Arduino to receive pocsag. I can see that for many codewords, the function ecd() returns an error-number, but does no correction. It happens to the synchronization codeword, so I do not think it has to do with me having poor reception.

When I have poor reception, the code corrects, at least, 1-bit errors, which I am happy for. Below is an example from today. The trailing digit is the return value from ecd().

This is a minor problem, but might affect the number of discarded "good" messages. I am not enough into this type of programming to solve it by myself, but I can sure test any suggested solutions. Thanks!

codeword 00 7A89C197 idle
codeword 01 7A89C197 idle
codeword 02 7A89C197 idle
codeword 03 7A89C197 idle
codeword 04 7A89C197 idle
codeword 05 7A89C197 idle
codeword 06 7A89C197 idle
codeword 07 7A89C197 idle
codeword 08 7A89C197 idle
codeword 09 7A89C197 idle
codeword 10 7A89C197 idle
codeword 11 7A89C197 idle
codeword 12 5903BC02 ecdErr
codeword 12 5903BC02 1
codeword 13 C1509A8C ecdErr
codeword 13 C1509A8C 1
codeword 14 83469D2C ecdErr
codeword 14 83469D2C 1
codeword 15 D6A32120
codeword 16 7CD215D8 synk ecdErr
codeword 16 7CD215D8 synk 1
codeword 17 EB499A13 ecdErr
codeword 17 EB499A13 1
codeword 18 B024CE2E
codeword 19 99766209 ecdErr
codeword 19 99766209 1
codeword 20 ECB830B9
codeword 21 86507EA4
codeword 22 ACF54BF5 ecdErr
codeword 22 ACF54BF5 1
codeword 23 DF4C93D7 ecdErr
codeword 23 DF4C93D7 1
codeword 24 D1D1BEA6
codeword 25 EB992A67 ecdErr
codeword 25 EB992A67 1
codeword 26 D6EFD1E0 parityErr ecdErr
codeword 26 D6EFD1E0 parityErr 2
codeword 27 B2F94531 ecdErr
codeword 27 B2F94531 1
codeword 28 893BC5CF ecdErr
codeword 28 893BC5CF 1
codeword 29 C1399031
codeword 30 AD6E8214 ecdErr
codeword 30 AD6E8214 1
codeword 31 AE30705C
codeword 32 AE933CDC ecdErr
codeword 32 AE933CDC 1
codeword 33 7C5215D8 parityErr ecdErr
codeword 33 7CD215D8 synk repaired!!! 2
codeword 34 E70E9EB1
codeword 35 82A0027A ecdErr
codeword 35 82A0027A 1
codeword 36 7A89C197 idle
codeword 37 7A89C197 idle
codeword 38 7A89C197 idle
codeword 39 7A89C197 idle
codeword 40 7A89C197 idle
codeword 41 7A89C197 idle
codeword 42 7A89C197 idle
codeword 43 7A89C197 idle
codeword 44 7A89C197 idle
codeword 45 7889C197 parityErr ecdErr
codeword 45 7A89C197 idle repaired!!! 1
codeword 46 7A89C197 idle
codeword 47 7A89C197 idle
codeword 48 7A89C197 idle
codeword 49 7A89C197 idle

(arduino-pocsag-test-esp8266_003)