HearingLossThreshold@500Hz + HearingLossThreshold@1000Hz + HearingLossThreshold@2000Hz + HearingLossThreshold@3000Hz ) div 4)

• if (Gain@3kHz - avg Hearing Threshold Level ) >= Gain@Peak - avg Hearing Threshold Level), then:
  • Adjust Gain Control / Volume Control to match Soft Target at 3000Hz.
• else
  • match Gain Control / Volume Control to frequency with peak gain.
  • match equalizer frequencies to Soft Target from 5.2 - 7.2 kHz range up to midpoint (i.e. if frequency is matched at greater than midpoint, reset it to midpoint).

Example code:

 EqMax       := NzBase.GetParamMax('BEQ1_gain');
 TargetCurve := sdSoft;
 
 Case TargetCurve of
   sdSoft:     TargetCurveValue := 40;
   sdModerate: TargetCurveValue := 60;
   else        TargetCurveValue := 80;
 end;
 
 // Adjust GC/VC to match Soft target at 3000 Hz.
 // However, if HearingLossThreshold at 500Hz > HearingLossThreshold at 1000Hz, 
//  and HearingLossThreshold at 1000Hz > HearingLossThreshold at 2000Hz, skip
 // {if (Audiogram.Values[fq500]  <= Audiogram.Values[fq1000]) or
 //    (Audiogram.Values[fq1000] <= Audiogram.Values[fq2000]) then}
 
 // Get frequency of peak gain
 HighestFreq := fq3000;
 if Audiogram.Values[HighestFreq] < Audiogram.Values[fq2000] then HighestFreq := fq2000;
 if Audiogram.Values[HighestFreq] < Audiogram.Values[fq1000] then HighestFreq := fq1000;
 if Audiogram.Values[HighestFreq] < Audiogram.Values[fq500]  then HighestFreq := fq500;
 
 // Get avg HearingLossThreshold 
 AvgThres := (Audiogram.Values[fq500]  + Audiogram.Values[fq1000] +
              Audiogram.Values[fq2000] + Audiogram.Values[fq3000]) div 4;
 
 // compare avg HearingLossThreshold to audiogram values at 3kHz and Peak frequency
 if (Audiogram.Values[fq3000]-AvgThres) >= (Audiogram.Values[HighestFreq]-AvgThres) then begin
     // if freq3000 contains peak, we simply adjust GC/VC to match Soft Target at 3000 Hz.
     AdjustParam(TargetCurve, 'matrix_gain', 0, 47, 1, 47 {2.997kHz}, TargetCurveValue);
 end else begin
     // if frequencies other than freq3000 contains peak gain,   
     // we adjust GC/VC to match Soft Target at that other frequency.
     Case HighestFreq of
        fq500 : AdjustParam(TargetCurve, 'matrix_gain', 0, 47, 1, 16 {500Hz},  TargetCurveValue);
        fq1000: AdjustParam(TargetCurve, 'matrix_gain', 0, 47, 1, 28 {1000Hz}, TargetCurveValue);
        fq2000: AdjustParam(TargetCurve, 'matrix_gain', 0, 47, 1, 40 {2000Hz}, TargetCurveValue);
     end;
     // Match equalizers frequencies to Soft Target from 5.2 - 7.2 kHz.
     SetParamValue('BEQ10_gain', FindBestMatch(TargetCurve, 'BEQ10_gain', 0, EqMax, 57 {5339Hz}, TargetCurveValue), False);  // 5.2 kHz
     SetParamValue('BEQ11_gain', FindBestMatch(TargetCurve, 'BEQ11_gain', 0, EqMax, 60 {6350Hz}, TargetCurveValue), False);  // 6.5 kHz
     SetParamValue('BEQ12_gain', FindBestMatch(TargetCurve, 'BEQ12_gain', 0, EqMax, 62 {7127Hz}, TargetCurveValue), False);  // 7.2 kHz
 end;

== Main Algorithms == Autofit routine dependencies:

• Normal (WDRC) autofit ⇒ Autofit Defaults
• Normal (WDRC) autofit ⇒ Calculate VC Range
• Normal (WDRC) autofit ⇒ Match 3kHz or appropriate peak

Autofit dependency overview: === Normal (WDRC) ===

• Apply Autofit Defaults
• Turn on mute (if available)
• Adjust compression ratios in each channel based on the following rules based on the audiometric thresholds 500Hz, 1kHz, 2kHz, 3kHz, & 4kHz:
  • if HearingThresholdLevel < = 35dB, then CR = 1:1
  • else if HearingThresholdLevel < = 40dB, then CR = 1.11:1 (or closest value)
  • else if HearingThresholdLevel < = 45dB, then CR = 1.18:1 (or closest value)
  • else if HearingThresholdLevel < = 50dB, then CR = 1.33:1 (or closest value)
  • else if HearingThresholdLevel < = 55dB, then CR = 1.43:1 (or closest value)
  • else if HearingThresholdLevel < = 60dB, then CR = 1.54:1 (or closest value)
  • else if HearingThresholdLevel < = 65dB, then CR = 1.67:1 (or closest value)
  • else if HearingThresholdLevel > 65dB, then CR = 1.82:1 (or closest value)
• Adjust overall Gain to match Soft Gain to Soft Target at 3kHz. If not OTE or RIC style instrument, then use formula to match 3kHz or appropriate peak.
• Equalizer
  • Match all Soft Gain frequencies to Soft Target, from 3kHz and below
  • Match all Soft Gain frequencies to Soft Target, from 3kHz and below (except OTE with Tubing Type ⇒ OTE Thin Tube, or RIC with Vent Type ⇒ RIC Open) (NOTE: The OTE exception is no longer necessary since the introduction of REAR adjustments to avoid negative gain in low frequencies (following Steve Armstrong's algorithm)) — Siegwart Mayr 2009/03/13 10:50
  • Equalizer (except OTE with Tubing Type > OTE Thin Tube, or RIC with Vent Type > RIC Open) = Reduce 200Hz & 500Hz by 2dB
  • Equalizer (for OTE with Tubing Type > OTE Thin Tube, or RIC with Vent Type > RIC Open) = Match Soft Gain at 200Hz & 500Hz to Software Target.
  • Equalizer (except OTE with Tubing Type > BTE Ear Hook, or RIC with Vent Type > RIC Custom Mold) = Reduce 200Hz & 500Hz by 2dB
  • Equalizer for OTE with Tubing Type > BTE Ear Hook, or RIC with Vent Type > RIC Custom Mold = Match Soft Gain at 200Hz & 500Hz to Software Target.
  • Equalizer = Reduce 200Hz & 500Hz by 2dB
  • Equalizer for OTE with Tubing Type ⇒ OTE Thin Tube, or RIC with Vent Type ⇒ RIC Open = Reduce 1.0kHz, 4.2kHz, & 5.2kHz by 4dB.
  • Match all Soft Gain frequencies to Soft Target from 3.5kHz to 4.2kHz
• Noise Reduction = On at minimum
• Calculate VC Range (if available)

=== AutoAdapt (if available) === Enable autofit on Half Shell and Full Shell products only, and having Adaptive Directional microphones: — Jenny Sudduth 2008/09/08 12:50

• Perform Normal (WDRC) autofit
• Adaptive Directionality (AD) = Apply AD, first setting
• Calculate VC Range (if available)

=== AGC-O ===

• Perform Linear autofit
• Custom Settings:
  • All except DigitalOne4AFC (ClariD) and Spin: if Hearing Threshold Level at 1kHz < 30dB, set Noise Reduction at Low (8db), else set at Off (Default for Linear autofit)
  • DigitalOne4AFC (ClariD): if Hearing Threshold Level at 1kHz < 30dB, set Expansion to 40dB, else set to Off (Default for Linear autofit)
• Set MPO (AGC-o) in all channels as follows:
  • If Hearing Loss Threshold at 1kHz < 20dB, then MPO = -12dB or closest value
  • If Hearing Loss Threshold at 1kHz > 20dB and < 50dB, then MPO = -8dB or closest value
  • If Hearing Loss Threshold at 1kHz > = 50dB, then MPO = -4dB or closest value

* Custom Settings: * Sparo, SparoAD (all Open Fit perhaps?): MPO = -8dB — Jenny Sudduth 2008/09/08 16:11 - Make all styles the same

• Show Soft and Loud Targets only
• Calculate VC Range (if available)

=== Linear ===

• Perform Normal (WDRC) autofit
• Compression Ratio = 1:1 (all channels)
• Noise Reduction = Off (if available)
• Show Soft Target only
• Calculate VC Range (if available)

=== Restaurant/Party ===

• Perform Normal (WDRC) autofit.
• Prompt for Directional Mics (if Half Shell or Full Shell), or detect whether instrument has built-in Directional Mics.
• If answer is No to directional mics, or not a Half Shell or Full Shell, then:
  • Compression Ratio = Increase by 1 step (next setting above) in first half of channels.
  • Equalizer = Reduce 200Hz & 500Hz by 4dB.
  • Gain = Reduce by 2dB.
  • Noise Reduction = Medium setting.
• Else if answer is Yes to Directional Mics, then:
  • Input = Cardioid/Directional.
  • Noise Reduction = Medium setting.
  • Custom Settings:
    • Sparo, SparoAD, nVe4, nVeAD, Flx (all Open Fit perhaps?):
      • Equalizer = Match all frequencies to Soft Target from 2.5 kHz - 4.2 kHz.
      • Gain = Reduce by 2dB.
• Calculate VC Range (if available).

=== Telephone ===

• Perform Linear autofit.
• Equalizer = Set 4.2kHz & above to minimum.
• Equalizer = Set 200Hz & 500Hz to minimum.
• Prompt for Telecoil, or detect it (do not prompt) when using:
  • RIC or BTE style instruments. These have it built-in. Answer = Yes.
  • CIC or MiniCanal style instruments. These cannot support a Telecoil. Answer = No.
• If answer is Yes to Telecoil, then:
  • Input = Telecoil.
• Else if answer is No to Telecoil, then:
  • Input = Omni-directional Mic.
  • Gain = Reduce by 3 dB.
  • Equalizer = Reduce 3kHz by 4 dB (2 steps).
• Show Soft Target only.
• Calculate VC Range (if available).

=== Music ===

• Perform Normal (WDRC) autofit
• Compression Ratio = 1.5:1 or closest value (all channels)
• Gain = Reduce by 4 dB
• Noise Reduction = Off (if available)
• Adaptive Feedback Canceler = Off (if available)
• Equalizer = Increase 200Hz, 500Hz, & 1kHz by 2 dB
• Calculate VC Range (if available)

=== Television ===

• Perform Normal (WDRC) autofit.
• Noise Reduction = Off (if available).
• Equalizer = Increase 500Hz & 1kHz by 2dB.
• Compression Ratio = Reduce all channels by 1 step.
• Calculate VC Range (if available).

=== Theatre/Place of Worship ===

• Detect whether using directional mics (read code in scratch memory). (Currently prompting for directional mics but should not) — Jenny Sudduth 2008/09/10 18:32
• If instrument has built-in directional mics (Sparo, SparoAD, InTune (except Intuition4+), Ethos), then:
  • Set Input = Cardioid by performing Restaurant/Party autofit
  • Bass boost = On (if available) (nVeAD, not turning On bass boost currently) — Jenny Sudduth 2008/09/10 18:57
• Else if no built-in directional mics (Spin, Sparo2, DigitalOne4NRPlus, Intuition4+, Ethos), then:
  • Set Input = Omni Mic by performing Television autofit
  • Bass boost = Off (if available)
• Noise Reduction = Low setting (if available, else Expansion TK = 40dB)
• Custom Settings:
  • Sparo, SparoAD:
    • Noise Reduction = Low setting (if available) (redundant with Restaurant/Party autofit)
    • Input = Cardioid (redundant with Restaurant/Party autofit)
  • Intuition4+, Ethos: Bass boost = Off (if available)
  • InTune (except Intuition4+): Bass boost = On (if available)
  • All except Intuition4+:
    • Equalizer: Increase 500 Hz & 1 kHz by 2 dB.
    • Compression: Reduce Compression Ratio in Ch. 2 & 3 by 2 steps (Ethos: Ch. 3 - 6).
• Calculate VC Range (if available)

=== Intense Noise ===

• Perform Normal (WDRC) autofit
• Prompt for Directional Mics (if Half Shell or Full Shell), or detect if available built-in (Sparo, Sparo AD, Sparo 8, Intuition 4AD, nVeAD, Flx)
• If answer is Yes to Directional Mics, then:
  • Gain = Reduce by 2 dB
  • Input = Hypercardioid/Directional
  • Noise Reduction = Highest setting
• Else if answer is No to Directional Mics, then:
  • Equalizer = Reduce 200Hz & 500Hz by 4dB.
  • Gain = Reduce by 4 dB
  • Compression Ratio = Increase first half of channels by 3 steps
  • Compression Ratio = Increase last half of channels by 2 steps
• MPO (AGC-o) = Midpoint (all channels)
• Noise Reduction = High (if available)
• Custom Settings:
  • Sparo, SparoAD, nVe4, nVeAD, Flx:
    • Equalizer = Match all frequencies to Soft Target from 2 kHz - 4.2 kHz
    • Reduce overall Gain by 4 dB
• Calculate VC Range (if available)

== Notation == == Archives ==

• WDRC Autofit for Accurio (rev 2006-08-01)