April 22, 2018

Dummy Head Sound Production Tips and Pitfall

Mick Sawaguchi UNAMAS Label C.E.O



1 Background of dummy head reevaluation  

Recording with an old and new dummy head makes it easy to enjoy 3D space by targeting listening with headphones. I think that it will be a good tool for activation of mobile audio or smart phone recently and young people's headphones listening tendency, so I would like to introduce the dummy head recording from the production side. 

The idea of ​​a dummy head is to mimic the face of a person and record a small microphone into the ear part, can you faithfully reproduce the sound we hear on a daily basis? It started with the appearance of the prototype "Mr. Oscar" of the dummy head developed at Bell Research Institute in 1933. 
Especially in Europe, dummy head research is still continuing, and academic fields such as hearing research, acoustic field measurement, acoustic analysis, etc. Its characteristics are as described below.


● Popularization of mobile audio and popularization of digital music  
players called DAP, adapted to the needs of listening to music easily anywhere Earphone listeners have increased, software optimized for headphones is also increasing its presence. it is not necessary to prepare separate MIX for achieving both speaker playback and headphone playback with the same sound source, so it is possible to provide a target with a balance that is optimal for listeners limited only to headphones .

● Dummy heads that can be used for recording and production have been introduced due to recent improvements in dummy head main body structure and improved sound quality of small internal microphones. Dummy heads of the 1980s had limited models of small microphones that can be used for built-in microphones, and its sound quality was not a preferable sound quality from the viewpoint of engineers.
Recently, the sound quality improvement of the miniature microphone is remarkable, and it is at a level that can be used sufficiently.

● Easily experience the 360 ​​degree surround sound field, since the spreading feeling of the sound field is localized outside the head, even when listening for a long time it is less tired than the sense of oppression due to the regular head position of the normal 2 CH stereo sound.

●The sound quality improvement of headphones and earphones has also
 advanced in recent years and the market of playback equipment called     
 high-quality DAP such as portable audio amplifier called Potaan and USB
 DAC connection etc. was formed and high quality playback became
 possible.

 
2 Utilize the features of dummy head  
 
Compared to microphones commonly used in studio etc., what kind of features does the dummy head microphone have?

● Front Center/ behind Orientation is poor
As dummy head researchers have pointed out, the dummy head is directly in front and the rear orientation is not good.



   It is excellent for the reproduction of +/- 45 degrees on the side  
centered on the ear and +/- 120 degrees above and below the head over the head.


   Ambience recording of natural sound and music can express superior 
3D feeling.


The features of the above two points can be applied to how to use dummy heads recording, Meanwhile, the dummy head is a natural sound recording in the field and the ambience of the music recording.When using it as a microphone, the spatial reproducibility of the dummy head is successfully used.

To faithfully reproduce the sound field of the site to be recorded or the concert venue, it is necessary to pay attention to noise and background noise as much. If the level of the sound source to be recorded is high, you can not raise the S / N ratio because it can be high, but in small organized music and natural sounds of soft sounds, you have to be careful about that point. Even in studio recording, the performer's scripting noise, the squeaking of the performer's chair, movement etc. are clearly reproduced, so it can be said that this is a two-sided nature with the characteristic of realistic reproduction.

3 Utilizing the natural reproduction of 360 degrees  

It is a way of using the superiority of reproducing the3 dimensional space possessed by the dummy head as it is, so there is nothing to pay particular attention to. The choice of where to install for the sound source is the most important.

   How to use as an ambience microphone in classical recording.

               

Instrumentation of studio recording OFF Mike, how to use as ambience.

                                   
                                  

 Field Recording General: 
 Field recording is the same for normal equipment, but wind  
 countermeasures are the basic, so dedicated wind shield covering the 
 ears of the dummy heads or even if there is still a shortage, please take 
 countermeasures against strong wind and rain are important.


4  Dummy Head Drama Play production  
 
Drama production with a dummy head can be used not only to reproduce the feature of naturalness as described above but also various ways of using the front, rear, left and right, top and bottom localization from close-up to far-distance.

● Use objective and subjectivity separately
Among the dialogues, since the monologue is an effective expression when the headphone listener's in-head position is set, a normal microphone is installed at the center position of the dummy head to mix with the dummy head sound, a miniature microphone is dummy head There is a usage such as installing it in the center of, and using it together. In the drama, in the drama etc. where the story progresses by comparison of the subjective scene of the hero with the objective scene, it is possible to effectively use such contrast of the outward / inner rank like a POV.


●Use vertical feeling and ON-OFF distance sense

Since the vertical feeling and the sense of distance can be reproduced
well, the situations such as the conversation of the two people on the
roof and the downstairs and the conversation under the waterfall and
the flow under the scene may also be reproduced by the scene in real
physical situations It will be realistic if you arrange the performance in
the form of up and down of the dummy head. Even in sound effect
creation, you can also create space with that arrangement.



 Clarification of front / rear localization 
  +/- 45 degrees from the center of the ears, as mentioned above, that  
  the reproducibility is good, as mentioned above, there are times when 
  you want to express the localization just in front of you or in the real 
  world with a drama or the like. In such a case, the listener will make a 
  judgment including the prediction by not finding the position from the 
  front or the rear from the beginning, but by making the preroll a little bit 
  and adding a sense of movement and ultimately making it the front or 
  backward localization So the recognition of stereotaxis is improved.
 
 
 What about sound effects? 

  If you create a dummy head drama at an outdoor location, sound effects  
  other than speech can be used naturally as a sound caught by a dummy 
  head without discomfort, but if you want to express a sound effect with 
  intention, you need a little ingenuity . Foley material etc. If you place 
  Foley material sound in the necessary localization of the dummy head 
  and record it in the studio, Foley for the dummy head is completed. As 
  mentioned earlier, materials with low levels such as rusting clothes and  
  it may pick up the background noise inside the studio in three  
  dimensions, 
  so you should record at the Foley studio with a low NC value or when the 
  S / N ratio is severe, It is also necessary to forcibly choose not to record 
  with a dummy head.  Plug-ins that applied HRTF conversion technology 
  that it sounds like listening on the dummy head has also appeared (many
  binaural coding etc.), but when it can not be convinced with .
  Realistic solution is that to play back the sound source once to the 
  studio with a speaker and to rerecord it with the dummy head with the  
  method of"Worldizing".
 

 

For example, if you want to create a sound design such as an object falling from overhead, a flame running around 360 degrees, FLY-OVER going through the head over the missile group, set up 4 to 5 surround speakers Or you can play each sound source from up and down speakers, perform surround panning and rerecord with the dummy head installed at the center. There is no way to deteriorate in terms of sound quality, but by physically converting it to the HRTF transfer function via the dummy head, we can express the satisfaction better than the plug-in at present.

5 Balance attention point between on dummy head production and speaker playback

The dummy head has merit in that it can easily provide virtual reality to the headphone listener. As for the point of note when recording, microphone picks up every sound of 360 degrees with omni-directionality, so we recommend you to select a studio with less air conditioning noise. (Please use it if it is effective depending on the scene.) The dummy head is recommended without having to bother with noise due to the effect of location style recording outdoors.

The point of caution about speaker playback is that when you mix with headphones, the BG level such as music and bass sound and the ambience level such as reverb tend to be lower than the speaker playback, so please also check the balance by playing the speakers when mixing these scenes .
The sound recorded by the dummy head will be sound whose 4-5 KHz is emphasized and the vicinity of 8 KHz is attenuated due to its structure. Although it is not a particular problem in headphone playback, consonants etc. of serifs are emphasized when considering playing back speakers, so it is also important to keep the peak component at the time of recording with peak limiter etc.


6 What is suitable for a dummy head Production ? 
 
The reproducibility of the dummy head microphone is excellent if it is within 60 degrees with the ear tab as the axis. For this reason, the scenes such as the sound of the ear and oblique behind are effective so the story of the mystery or thriller psycho-touch is recommended. Adventure and spectacular stories are also genres that can be enjoyed with plenty of sound effects.


7 Dummy Head Mixing Tips
 
As mentioned above, the dummy head is not good at reproducing the center of the front and just behind. For this reason, in order to effectively utilize the sound field, sounds and localization are also effective if narration by the ordinary microphone and monologue recording are used together. Since the height also comes out a little, you should try the relationship between the top and bottom of the dummy head, for example the first floor and second floor scenes. Tools such as pan pot for dummy head are not currently in practical use, so we have difficulty in producing sound effects using 360 degrees. (There is a mixing console for RSS and dummy head, but it is not practical anymore ...) Also, there are not many different sound effects libraries recorded by dummy heads, and music also has less software to meet these objectives, so please think about the content balancing these points etc.

Even in Japan, people who recorded natural sounds with dummy heads and made them into CDs, and in the USA, Cesky Label produces music of various genres recorded by dummy heads for DAP listeners. If you have the opportunity, please experience dummy head production that can easily reproduce 3D stereophonic sound.


Mick Sawaguchi Bio:Fellow member AES and ips 



1971 Chiba Institute of Technology graduated from Electronics Engineering, the same year started to work in NHK as a drama mixer, he is in charge of winning works such as Arts Festival Grand Prize, Broadcast Culture Fund Award, IBC Non-Bull Doll Award, Vatican Prize Winner.

From 1985 He has been deep involved surround production. He has been respected as "Surround Syogun". Since 2001, AES and Southeast Asia focused on workshops, seminars and technical presentations, promoting Asian surround production. SurroundTerakoya opened for promotion from 2002. Since 2007 he has launched the high-quality music production label UNAMAS label and is doing high-quality music distribution. The 4 times award winning on Japan Pro Music Recording by Hi-Res music .From 2015, focusing on immersive surround sound.

  http://unamas-label-jp.net.

January 9, 2018

Immersive surround 9.1 channel production 「UNAHQ 2011 A.Piazzolla by Strings and Oboe」

By Mick Sawaguchi C.EO UNAMAS-Label




[ Introduction ] 
UNAMAS label's 9CH immersive surround approach is 6th work in this work from "Four Seasons" released on 2014-06. By Recording Miking of different height and channel each time, it is able to verify the difference of sound of various height information. The big topic at the German Ton Meister Conference in Cologne in 2016 was the effort to surround play environment with immersive surround and binaural coding. This work .introduces the behind-the-scenes produced 192-24 9.1 ch. The album which is said to be a tango 's heretics "Tango composer who can not dance" A. Strings and Oboe masterpieces of Piazzolla.


[ 1. Album Concept ]  
Since UNAMAS label is a privately owned boutique label, the biggest advantage is that I can realize from planning to production without scooping up the approval document! ! This time, we worked on the following concept as the next work of "Death and the Maiden" released in June 2016. In 2016, Astor Piazzolla celebrated its 95th birthday. I feel "SOUL"by Piazzolla music which combines the European classics with the essence of Jazz from childhood that he spent in New York, taking into account the tango tradition from his music. As Jazz originally started as a dance accompaniment and BGM at the club and then evolved into music for independent appreciation, surely he also pursued sublimation of tango, and still gives "SOUL" to listeners I think .

I thought Piazzolla's music needed more direc energy than brilliance, first by searching for the best recording venue for expression. Recording of classical genres so far has been carried out on the home base of Karuizawa Oga Hall, but in this work, I thought that it would be too brilliant sound, first I came up with a studio that is Nihon Onkyo Engineering Sound Lab (AGS studio) which recorded a piano solo at Jun Fukamachi UNAHQ 2003 "REIMEI". If it is realized it will be the first time in 6 years. This is not a recording studio at the research facility which adopted the diffuser developed for the purpose of "recreating the sound of the forest" called AGS, The Piazzolla 's tango is a bandneon lead, but in order to realize it in the UNAMAS style .I used Ob with strings ensemble as lead and depending on the song Vn also takes charge of lead.

UNAMAS A.Piazzolla Septet

Vn lead:
Premavera Portena
Liber Tango
Tanguedia
Fugata

Oboe lead:
Oblivion
Adios Nonino
Soledad


It is an album that became a big challenge as a label as to how the powerfulness different from the classic series at Oga Hall is reflected in this studio. Mr. Tsuchiya of arranging finished with collecting various existing scores and sometimes by ear copies from the original songs because the original score of Piazzolla is not quite perfectly left.



[ 2. TECHNOLOGY ]  
The main system configuration that UNAMAS label currently introduces is similar also in this work, with the digital microphone as the main microphone, with the optical MADI cable from the RME - digital and analog mic pre to the ambience and the height –CH as analog microphone set IN the studio .Then it Transferred to the monitor room, where the MADI signal is distributed in two and recorded in the main DAWA Pyramix ver 10 and MAGIX Sequoia DAW. In addition, we are also doing anti-vibration of all equipments. battery drive and EMC noise introduced from UNAHQ 2009 "Death and the Maiden" released in 2016.




This time AGS will record string instruments in the space that was set up on the whole Mr. Sakiyama of Nihon Onkyo Engineering and his staff give an idea installed acrylic reverberation plate around AGS and reinforced the sound of the high frequency.









[ 3. Height for Making Immersive Surround Surround ]
Unlike the Ohga Hall, the sound condition of this time is not that we can reproduce rich sounds with height CH. I studied how to catch Height CH in the studio space, raised the stand to the very end of the ceiling and set the SANKEN CUW-180 XY pair to the left and right there. If you hear only the height CH, it is a dry sound compared to the hall, but added a little surround reverb (FLUX IRCAM VERB 3) at MIX.

[ 4. From MIX to Master ] 
According to the release format when editing is over 
* 2 CH (normal 2 CH and MQA 2 CH) 
* 5.1 CH Surround 
* Auro 3D surround for HPL-9 
I set separate Pyramix edit screens and do the best MIX for each, so-called Down MIX is not used.
 


[ 5. About PCM recording and TP ] 
In Pyramix v-10, has a fanction of final check with loudness and dynamic range so far, a tool that can monitor with 2 CH and 5 CHMIX, such as display of TP (true peak) effective for preventing distortion, was introduced. At present AES Recommendations AES TD 1004.1.15-10 recommended streaming music distributionby Internet operation plan has been issued, TP is limited to -1.0. In conformity with this recommendation, it turned out that theTP peak level of MIX which I control around 1.0 -1.4 TP db, For reference, I tried checking various music of J-POP and another company label, but MIX such as TP = O-0.2 is also seen in Hi-Res music classic and so on.

TYPICAL POP MIX TP

UNAHQ 2011 FINAL MIX TP

[ To the end ] 
This work has released 2CH / 5CH surround version in 2016 - December, and HPL - 9 and MQA version in January 2017. Moreover, since January 2017, we were able to realize worldwide distribution with HRA distribution site that based in Germany. The listening environment is rapidly changing from SPOTYFY and I-TUNE MUSIC to TI-DAL, NATIVE DSD and Hi-Res delivery and headphone listeners. I think that the diversity of master sound sources will continue to expand.