Audio Audit for iPhone serves as a reference generator of sounds or records for the purpose of setting up, testing and burn-in speakers, headphones and Audio Components. The application contains six main parts.

1. Frequency generator – serve as a generator of sinusoidal frequency
2. Noise Generator – generates different types of noise
3. Adjusting of the stereo base – useful tool for setting a stereo base
4. Indication of inverted phase
5. Records for testing – contains five test records without compression for assessment of audio quality
6. Microphone – easy tool for ambient measurement with graphics precise indicators

 

 

FEATURES:

• Determine the frequency range loudspeaker systems
• Finding the frequency characteristics of the audio set
• Control stereo base, left channel plays on the left and right channel on the right side
• Finding the balance of the right and left channel (play left and right side equally loud?)
• Detection of parasitic resonances and disturbing sounds
• Detection of inverted phases
• Burn-in speakers (The new speakers are recomended to burn-in. For this purpose you can use one of the available noise.)
• Test the sound quality after adjustment
• All sounds are uncompressed (“it´s pure”) audio files: PCM 44100Hz, 16bit, 2channel (stereo) – CD Quality
• Sound level can be controlled only by hardware buttons on the device

 
Simply it´s reference application.
 

DETAILS:

“Analogue” indicators:

• Peak indicator – red color (-75dB – 0dB)
• RMS indicator – black color (-75dB – 0dB)

 
Peak and RMS indicators for the left and the right channel
 
Frequency generator

• Sinusoidal signal of frequency (1/3 octave scale, Peak -12dB, RMS -15dB): 20Hz, 25 Hz, 31Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1000Hz, 1250Hz, 1600Hz, 2000Hz, 2500Hz, 3150Hz, 4000Hz, 5000Hz, 6300Hz, 8000Hz, 10000Hz, 12500Hz, 16000Hz, 20000Hz
• Swap sinusoidal signal: 20Hz – 20000Hz (logarithmic course, Peak -12dB, RMS -15dB)
• Swap sinusoidal signal: 20Hz – 630 Hz (logarithmic course, Peak -12dB, RMS -15dB)
• Swap sinusoidal signal: 630Hz – 20000Hz (logarithmic course, Peak -12dB, RMS -15dB)

 
Noise generator

• White Noise: Peak -10dB, RMS -15dB, frequency range 20Hz – 20000Hz)
• Pink Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
• Brown Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
• Human Noise: Peak -2dB, RMS -15dB, frequency range 20Hz – 20000Hz)
• Silence Noise: Peak -55dB, RMS -96dB, frequency range 20Hz – 20000Hz)

 
Adjustment stereo base

• Bass Drums L: left side (Peak -2dB, RMS -15dB)
• Bass Drums R: right side (Peak -2dB, RMS -15dB)
• Bass Drums L-R-L: transition from left to right side and back (duration 30s, Peak -2dB, RMS -19dB)
• Treble Drums L: left side (Peak -1dB, RMS -16dB)
• Treble Drums R: right side (Peak -1dB, RMS -16dB)
• Treble Drums L-R-L: transition from left to right side and back (duration 30s, Peak -1dB, RMS -21dB)

 
Indication of inverted phase

• Guitar-normal: phase in order (Peak -0.3dB, RMS -14dB)
• Guitar-Invert: right channel inverted (Peak -0.3dB, RMS -14dB)
• Cool-normal: phase in order(Peak -0.3dB, RMS -13dB)
• Cool-invert: left channel inverted (Peak -0.3dB, RMS -13dB)

 
Test records

• Classic: duration 30s, Peak -0.3dB, RMS -15dB
• Cool: duration 36s, Peak -0.3dB, RMS -13dB
• Guitar: duration 36s, Peak -0.3dB, RMS -14dB
• Jazz: duration 36s, Peak -0.3dB, RMS -15dB
• News: duration 38s, Peak -0.3dB, RMS -15dB
• Road: duration 50s, Peak -0.3dB, RMS -16dB

 
Microphone

• Precise graphics indicators for the both channels (from -22dB to 0dB, step by 1dB)

 

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