With HDR microphones, powerful front-facing speakers and SenseVoice, I’d love to know how LocaMsg would perform on the HTC One. Wouldn’t you?
If you were to visit the University of Cambridge Computer Lab’s library and read my dissertation, you might notice that I had anticipated significant improvements to the audio hardware of phones:
Mobile audio hardware may yet see a general improvement as voice communication capabilities become decreasingly important.
Of course, that is relative to other potential functions of audio hardware – unfortunately the word limit prevented me from being more explanatory.
The preceding sentences in my dissertation detail the limitations I encountered:
The main limitation is the quality, maximum amplitude and capabilities of the audio hardware of mobile devices, which still only perform satisfactorily at phone calls. When problems such as high THD1 are combined with limited amplitude and/or echoes, signal detection becomes very difficult. The limited spectrum over which the hardware performs well also prevents exploitation of more bandwidth, and ultrasonic communication.
While the presumably improved fidelity and reduced total harmonic distortion of the HTC One’s speakers as well as increased acoustic transmission range and reduced microphone clipping (enabling more successful acoustic echo cancellation) are welcome changes, the mixing of the data from the dual membranes of the microphones and SenseVoice’s frequency response adjustment might have a more fun2 impact on the signal that the Android framework would ultimately supply LocaMsg with.
I miss working in this area.
- For completeness, here is the glossary entry for THD:
Total Harmonic Distortion. A measure of the distortion of the output of an audio system relative to the input defined as the RMS of the harmonics of the input signal in the output divided by the RMSs of the original signal, though in practice noise is included in the measurement.
The glossary entry for RMS was:
Root Mean Square. A measure of the magnitude of a varying quantity, defined as:
The glossary entry for harmonic was:
A component frequency of a signal that is an integer multiple of the fundamental (lowest) frequency component of that signal.
And entry 33 in the bibliography was:
G Slone. The audiophile’s project sourcebook. McGraw-Hill, New York, 2002.
- This is code for difficult to predict and challenging to deal with. [↩]