diff options
Diffstat (limited to 'sms/filters.c')
| -rw-r--r-- | sms/filters.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/sms/filters.c b/sms/filters.c index 9c13ad5..7f31317 100644 --- a/sms/filters.c +++ b/sms/filters.c @@ -33,9 +33,13 @@ */ sfloat sms_preEmphasis(sfloat fInput, SMS_AnalParams *pAnalParams) { - sfloat fOutput = fInput - SMS_EMPH_COEF * pAnalParams->preEmphasisLastValue; - pAnalParams->preEmphasisLastValue = fOutput; - return fOutput; + if(pAnalParams->preEmphasis) + { + sfloat fOutput = fInput - SMS_EMPH_COEF * pAnalParams->preEmphasisLastValue; + pAnalParams->preEmphasisLastValue = fOutput; + return fOutput; + } + return fInput; } /* de-emphasis filter function, it returns the filtered value @@ -44,9 +48,13 @@ sfloat sms_preEmphasis(sfloat fInput, SMS_AnalParams *pAnalParams) */ sfloat sms_deEmphasis(sfloat fInput, SMS_SynthParams *pSynthParams) { - sfloat fOutput = fInput + SMS_EMPH_COEF * pSynthParams->deEmphasisLastValue; - pSynthParams->deEmphasisLastValue = fInput; - return fOutput; + if(pSynthParams->deEmphasis) + { + sfloat fOutput = fInput + SMS_EMPH_COEF * pSynthParams->deEmphasisLastValue; + pSynthParams->deEmphasisLastValue = fInput; + return fOutput; + } + return fInput; } /*! \brief function to implement a zero-pole filter |