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| author | John Glover <john@john-glovers-macbook.local> | 2010-12-17 15:59:42 +0000 |
|---|---|---|
| committer | John Glover <john@john-glovers-macbook.local> | 2010-12-17 15:59:42 +0000 |
| commit | a2704c86955830fda9ef4c8de9dca5ae95eb7f2a (patch) | |
| tree | f849ea6610e2f349fe9179fd0ba966f34a196d82 /sms/filters.c | |
| parent | 97292e56442aa9442ee8863ea320e6e54c1c6fbf (diff) | |
| download | simpl-a2704c86955830fda9ef4c8de9dca5ae95eb7f2a.tar.gz simpl-a2704c86955830fda9ef4c8de9dca5ae95eb7f2a.tar.bz2 simpl-a2704c86955830fda9ef4c8de9dca5ae95eb7f2a.zip | |
Added an option in SMS_AnalParams/SMS_SynthParams to enable/disable pre-emphasis (still enabled by default).
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 |