39 s application_number US 17500893 A description the preferred embodiment of the present invention will now be described with reference to a standard bch 15 7 code adapted by the present invention to transmit one additional information bit with a modified bch 15 7 1 code the standard bch 15 7 code transmits a 15 bit codeword comprising a 7 bit dataword concatenated with an 8 bit checkword at an efficiency rate of 7 15 or 0 47 the standard code can correct for t 2 errors the modified code will transmit a 15 bit codeword comprising an 8 bit dataword for an efficiency rate of 8 15 or 0 53 the modified code corrects for an approximate average of 1 5 errors at a bit error rate of less than 2 u00d7 10 2 in this example the codeword will be transmitted over a wireless channel which has a raw channel bandwidth of 36 kbps the normal coding efficiency of 7 15 results in 16 8 kbps for information and 19 2 kbps for redundant check bits it is desired to increase the information rate to 19 2 kbps by modifying the bch coding scheme selected the information rate may be increased to 19 2 kbps by borrowing one check bit from each code word the standard bch encoder and decoder circuits are modified such that the first check bit in each code word is truncated at the encoder and substituted at the decoder with an eighth information bit the net result is that the information rate is increased to 19 2 kbps with a only fractional degradation in error correction capability referring to the system block diagram.