diff options
| -rw-r--r-- | mg2ec.h | 12 |
1 files changed, 11 insertions, 1 deletions
@@ -155,6 +155,7 @@ struct echo_can_state { short lastsig[256]; int lastpos; int backup; + int dc_estimate; }; @@ -257,9 +258,16 @@ static inline void init_cc(struct echo_can_state *ec, int N, int maxy, int maxu) static inline void echo_can_free(struct echo_can_state *ec) { + printk("EC: DC bias calculated: %d V\n", ec->dc_estimate >> 15); FREE(ec); } +short inline dc_removal(int *dc_estimate, short samp) +{ + *dc_estimate += ((((int)samp << 15) - *dc_estimate) >> 9); + return samp - (*dc_estimate >> 15); +} + static inline short echo_can_update(struct echo_can_state *ec, short iref, short isig) { @@ -274,6 +282,8 @@ static inline short echo_can_update(struct echo_can_state *ec, short iref, short int Py_i; /* ... */ int two_beta_i; + + isig = dc_removal(&ec->dc_estimate, isig); /* flow A on pg. 428 */ /* eq. (16): high-pass filter the input to generate the next value; @@ -646,7 +656,7 @@ static inline struct echo_can_state *echo_can_create(int len, int adaption_mode) 2 * sizeof(short) * (1 << DEFAULT_ALPHA_ST_I) + /* s_s */ 2 * sizeof(short) * (maxu) + /* u_s */ 2 * sizeof(short) * len); /* y_tilde_s */ - init_cc(ec, len, maxy, maxu); + init_cc(ec, len, maxy, maxu); } return ec; } |