114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
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/*********************************************************************
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Silence.H - Includes to use the code to detect silence.
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begun 5/14/94 by Mike Rozak
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*/
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#ifndef _SILENCE_H_
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#define _SILENCE_H_
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#ifndef _SPEECH_
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typedef unsigned _int64 QWORD, *PQWORD;
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#endif
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/*********************************************************************
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Typedefs */
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#define SIL_YES (2)
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#define SIL_NO (0)
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#define SIL_UNKNOWN (1)
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// #define SIL_SAMPRATE (11025) // assumed sampling rate
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#define PHADD_BEGIN_SILENCE (4) // 1/4 second
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#define PCADD_BEGIN_SILENCE (4) // 1/4 second
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#define FILTERNUM (1024) // max # samples i nthe filter
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#if 0
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#define MAXVOICEHZ (300) // maximum voice pitchm in hz
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#define PHMAXVOICEHZ (300) // maximum voice pitch in hz (phone)
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#endif
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#define PHMAXVOICEHZ (500) // maximum voice pitch in hz (phone)
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#define PCMAXVOICEHZ (500) // maximum voice pitch in hz (PC)
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#define MINVOICEHZ (50) // minimum voice pitch in hz
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// Store characteristics of a block
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typedef struct {
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WORD wMaxLevel;
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WORD wMaxDelta;
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BYTE bIsVoiced;
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BYTE bHighLevel;
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BYTE bHighDelta;
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} BLOCKCHAR, *PBLOCKCHAR;
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// Store information about a block
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typedef struct {
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short *pSamples; // Sample data, or NULL if empty
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DWORD dwNumSamples; // number of samples in block
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QWORD qwTimeStamp; // time stamp for block
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} BINFO, *PBINFO;
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class CSilence {
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private:
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WORD m_wBlocksPerSec;
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WORD m_wBlocksInQueue;
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WORD m_wLatestBlock; // points to the last block entered in the circular list
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PBINFO m_paBlockInfo;
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DWORD m_dwSoundBits;
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DWORD m_dwVoicedBits; // turned on if block was voiced
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BLOCKCHAR m_bcSilence; // what silence is
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BOOL m_fFirstBlock; // TRUE if the next block is the first
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// block ever, and used to judge silence, else FALSE
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BOOL m_fInUtterance; // TRUE if we're in an utterance
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DWORD m_dwUtteranceLength; // Number of frames that utterance has gone on
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WORD m_wReaction; // reaction time
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WORD m_wNoiseThresh; // noiuse threshhold
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short *m_pASFiltered; // pointer to filtered data buffer
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WORD m_wAddSilenceDiv;
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DWORD m_dwHighFreq;
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DWORD m_dwSamplesPerSec;
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#ifdef USE_REG_ENG_CTRL
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BOOL m_fSilenceDetectEnbl;
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BOOL m_fVoiceDetectEnbl;
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WORD m_wTimeToCheckDiv;
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DWORD m_dwLowFreq;
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DWORD m_dwCheckThisManySamples;
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DWORD m_dwNumFilteredSamples;
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WORD m_wMinConfidenceAdj;
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DWORD m_dwLPFShift;
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DWORD m_dwLPFWindow;
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#endif
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public:
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CSilence (WORD wBlocksPerSec);
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~CSilence (void);
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BOOL Init(BOOL fPhoneOptimized, DWORD dwSamplesPerSec);
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BOOL AddBlock (short * pSamples, DWORD dwNumSamples, WORD * wVU,
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QWORD qwTimeStamp);
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short * GetBlock (DWORD * pdwNumSamples, QWORD * pqwTimeStamp);
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void KillUtterance(void);
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void NoiseResistSet (WORD wValue)
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{
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m_wNoiseThresh = wValue;
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};
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void ReactionTimeSet (DWORD dwTime)
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{m_wReaction = (WORD) ((dwTime * m_wBlocksPerSec) / 1000);};
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WORD GetBackgroundNoise (void)
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{return m_bcSilence.wMaxLevel;};
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void ExpectNoiseChange (WORD wValue);
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private:
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BOOL CSilence::IsSegmentVoiced (short *pSamples, DWORD dwNumSamples,
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DWORD dwSamplesPerSec, WORD wMinConfidence, short *asFiltered);
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BOOL CSilence::WhatsTheNewState (DWORD dwSoundBits, DWORD dwVoicedBits,
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BOOL fWasInUtterance, BOOL fLongUtterance,
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WORD wBlocksPerSec, WORD *wStarted, WORD wReaction);
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};
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typedef CSilence *PCSilence;
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WORD NEAR PASCAL TrimMaxAmp(short * lpS, DWORD dwNum);
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#endif // _SILENCE_H_
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