Dummy Head
& EarPhones Type
Binaural Microphones
w/ Medical Bio Sensing
Photograph:Hassy@MetaDesignWork
(C)2021 Hassy All Right Reserved
Dummy Head Tec Fee Dummy Head Addendum

- Why people could be recognized the 3D Sound ? -
[HRTF]

(as "Head Related Transfer Function" ,
Sound Reflection & Diffraction of Front/Side Face w/Concha ,
that Phase Interfare makes unique Frequency Peak & Dip .)


https://lmkprod.com/what-is-hrtf-brief-explanation/
deriving-hrtfs-and-the-aes692015-file-format

(Head & Ear Pinna makes "HRTF")
http://www.riec.tohoku.ac.jp/pub/hrtf/index.html
below images are from
behind-scene-sony-mh1-r-story.html

(a part of HRTF w/Ear Pinna (=Concha)
& "ECTF" of Ear Canal , makes
Synthetic Auditory Transfer Function)

(a part of "HRTF" only)

([ECTF] only)

(also "Ear Canal Transfer Function" ,
that makes unique Sound Peak & Dip too
of "Half Closed Tube's" Reflection & Resonance .)

(Synthetic Auditory Transfer Function
as "SATF")

(Canal & Pinna reflection/resonance makes "SATF")
http://www.neuroreille.com/promenade/english/ear/

(avobe explanation is very nice for understand ,
Why people could be recognized the 3D Sound ?

The core that people recognize the direction of sound
or 3D Sound is also with that Phase Interfare
of "HRTF" & "ECTF" .)

(Azimuth & Frequency Responce)
https://note.com/leftbank/n/n83db3a4d6108

(These differences are the principle ,
Why people could be recognized
the direction of sound or 3D Sound .)

(Equivalent Loudness Curve)
AIST Equivalent Loudness Curve 2003

(The Frequency Responce of over 1KHz
is the reflection of above "SATF" @100Phon ,

also HRTF & ECTF are greatly reflect
the auditory characteristics of mankind .)


[Dummy Head Binaural Microphone]

(Affordable , but precision Auditory structure
makes Real 3D Sound w/ [HRTF] & [ECTF] )

[Precision Medical Ear Model]


(Precision Casting from living body or donation ,
It was a colorless & transparent Silicon , may be
I purchased from Edmund Scientifics around '90 .)

[Precision Ear Canal Model]




[Casting]

from Precision Medical Ear Model

(w/ Alginate + Quick Lime
+ Polyurethane Resin + Silicon

I'll try to use the UV cure Resin )

[Transducers]

(Medical Heart Beat/Piezo Contact Mic)


[Affordable Dummy Head]

Type I / Type II

(Head Torso & Ear w/HRTF & ECTF
need PlugInPower/Phantom Reg)
Type I
(20Hz-16/20KHz)

(I'm planning to order , sample image)
Sample Sound

(( Sample Sounds are
around Dummy Head /
Binaural Microphone

each sound is 10s of

1.FM Radio White Noise
2.AM Radio dis-tuning Noise
3.The Choir of Mrs. Maria Callas
4.Multi Strobe Hi-V Charging-Flash
5.Shake the granular medicine pouch
6.Poetry Reading "Amenbo Akaina AIUEO"
7.Tibetan Song - Himalaya Alan Dawa Dolma

Plasma Sound of Plasma Speaker , if possible .))


Type II
(20Hz-16/20KHz)

(I'm planning to order , sample image)
Sample Sound

[Head Torso Stand & Carry Bag]

(Plan: use with
Precision Audio Analysis Microphones
,

such as Dayton EMM-6/dbx RTA-M/Beyer MM-1/
GoldLine MK-8A/NTI MiniSPL/GoldLine TEF4

makes $1000+ Precision Dummy Head System ,
also Frequency Responce is 20Hz-20KHz .


& also 10Hz-40KHz $7000+ Highend System
w/DPA 4007A and more .
(Stereo matched pair enabled)


with High end Phantom Regulator
& Precision Microphone Preamp

Precision Audio Analysis Microphones

dbx M2 (Plastic housing of RTA-M) /
Gold Line MK-8A mod (improved Lo Noise)

(May be I'll be manufactured
the Precision Dummy Head w/MK-8A ,

RTA-M is a Transformer Balanced ,
but MK-8A is the Electric Balanced ,
then it should be much improved surely .

"Audio Transformer" should be color-rised
the sound warm/fat , but I think not better
such sound for the Precision Dummy Head . )


[Earphones Type Mic]

Inferior than true Dummy Head
(less/no ECTF & rich/poor HRTF) ,
but anybody feel free to try 3D sound ,
only put "EarPhones type Mic" on one's Ear .


(Affordable Prototypes are all 20Hz-16KHz ,
but enable 20Hz-20KHz w/superior Mic Unit ,
such as Countryman Isomax B3/B6 or DPA 4060 ,
also much expensive over $1000- .)

5mm(WM64) EarPhones Mic

Type I / Type II / Type IIb

(Pseudo Binaural w/o ECTF
no EarPhones Drivers
need PlugInPower/Phantom Reg)
Type I

(Slight depth - Poor HRTF)

Sample Sound

Type II

(Deep depth - Best HRTF
acutual diameter : 7.5mm
may be better structure)

Sample Sound

Type IIb

(Deep depth - Best HRTF
acutual diameter : 7.5mm
may be best structure)

Sample Sound

8mm EarPhones Mic

Type Ib / Type IIc

(Pseudo Binaural w/o ECTF
need PlugInPower/Phantom Reg)
Type Ib
(slight depth - Poor HRTF)
Sample Sound

Type IIc

(Deep depth - Best HRTF
acutual diameter : 10mm
may be better structure
but very tight)
Sample Sound

5mm EarPhones Mic

Type IId

(Almost Binaural w/a part of ECTF
need PlugInPower/Phantom Reg)

("half depth" of Ear Canal ! )

(Deep depth almost "in Ear Canal" -
Most Best HRTF & a part of ECTF
acutual diameter : 6.6mm
may be most best structure
but the concern of
humidity & Artifact Noise)
Sample Sound


[MEMS very small/thin Mic]

for "internal Ear Canal"
(100Hz-10KHz
Binaural w/ECTF , need exclusive
Phantom Reg & PreAmp Unit)

(acutual size : 4.3*4.8mm)

(SP0103N 3.8*6.2*1.5mm / Mogami 2944 OFC
& Silver Wire for Ear atachment)


(Most deep depth , almost Ear Drum position ! )



(Xylocaine Percutaneous anaesthesia
& KY Jerry etc. Medical Lubricant ,
for reduction the pain of insertion .)
Sample Sound -
almost Ear Drum position

Improved
(more thin/more tiny diameter)
(SPU0414HR5H 3.8*3*1mm)
(acutual size : * mm)
Sample Sound -
almost Ear Drum position
Sample Sound -
half depth of Ear Canal
Sample Sound -
almost Entrance of Ear Canal
(also you may be acquired 20Hz-20KHz much HiFi sound ,
w/Countryman B6 2.5mm or SENNHEISER MKE2P-C 4mm ,
if you had much buget over $2000 for "consumable goods" .)

[Exclusive 2ch Mic Preamp]

(w/OPA1622 High end OPAmp
Head Phones Drive enabled)
w/Phantom Regulator Unit
(DC3V ECM Mic Phantom
& DC+/-3V for PreAmp )

( There is no HPF for Lo Cut
too much Lo Frequency
or Artifact Noise . )

(-20dB to +14dB variable)


[Mini Doll Head w/Silicon Ear model]

& 5mm(WM64) EarPhones Mic Type IIb
(Pseudo Binaural w/o ECTF
need PlugInPower/Phantom Reg)


(may be I could be manufacturered
the "Cat/Dog/Fox Head Binaural Microphone" ,
if I Got the INF of those Auditory structure ,
also I could got Cat/Dog/Fox's Head Torso .)

or w/dual CCD Cam odd/even frame 3D Video
like as "Fujiwara/Apple Remote Reality"
Tele-Existence & Tele-Presence System .)
attached w/ Hand Grip
Sample Sound


[Bio Sensing]
[Para Medical Piezo Mics]

(used for "Korotokof" & Heart beat sound pick up
There is no Datasheet , but the usual Response
Freqyency range is few Hz to 3KHz , and may be
w/built in FET PreAmp , like as TSD108 )
Application 1 Application 2

Contact Mic (Dual)
28mm Dynamic / 5mm ECM
Sample Sound
ParaMedical Piezo Dynamic ECM

[Electric Stethoscope]
(builed in 5mm ECM @"Diaphragm" of Stethoscope .
"Diaphragm" is the Physical amplifier ,
that may be +6dB or more gain boost of viblation .
Frequency Responce is few Hz to few KHz .

Stethoscope is hard Ear's lateral pressure & unpleasant ,
but the Electric Stethoscope is comfortable and useful ,
because use with built in Microphone & Power Amp ,
also You may use your favorite Head/Ear Phones .)

(Single Diaphragm , I'll choice Blue & Red)
Sample Sound

[Medical Stethoscope / Contact Probe Systems]

( "DRG Symphony Traditional" Mid range Medical Stethoscope /
Contact Probe is w/ECM & Contact Probe & HeadPhones Amp)


[Affordable 2ch Tiny Mixer & Mic Preamp]

(w/OPA1622 Precision High end OPAmp
Head Phones Drive enabled)
w/Phantom Regulator Unit
(DC3V ECM Mic Phantom
& DC+/-3V for Mixer/PreAmp )

( There is no HPF for Lo Cut
too much Lo Frequency
or Artifact Noise . )







[Precision 2ch Mic Preamp & Head Phones Amp]

(w/INA103/OPA1622/LME49600/CP Pot)
w/Phantom Regulator
(DC B+18V Mic Phantom & DC+/-18V 1A
Extremely Lo Noise for PreAmp & OutputAmp)

( There is no HPF for Lo Cut
too much Lo Frequency
or Artifact Noise . )


Plan: EMG like Vibration Sensing
( enabled Auditory nerve signal ? )
Plan: Optical Vibration Sensing
( like as [Plethysmograph] )
Plan: Electric Stimulation "Hearing" System
(Sound to Electric Stimulation of Ear Canal)


Other Bio Sensing
Remote Reality / Neural Sound

[TED4 Kobe]

( Precision $30000 R&D Dummy Head System
w/ [Tele Existence] & [Tele Presence] Function
also w/ world initiative [Tactile feed back System] )

( I was an Engineer of above System design/develop ,
and also I designed/developed below system too ,
aka "gagadoll" Real-Doll Tactile feedback System . )


[gagadoll] Tactile feedback System

Movie I Movie II Movie III

Electronics Stethoscope
EMG/ECG/EKG
GSR/Skin Temp
Heartbeat sensor (plethysmograph)
Heartbeat sensor (plethysmograph)
EMG & several Bio Sensing

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(C)2000-2021 Hassy All Right Reserved
Meta Design Work