Re: Wireless Audio for Research

[Jose Garcia-Uceda <J.Garcia@xxxxxxxxxxxxx>]

Hi Tatsuya,

       You are right just if the DC-DC converter is  connected to an AC power :-)

Anyway noise is like God, is in everywhere !

Jose

-------- Mensaje original --------

De: Tatsuya Hirahara

Fecha:09/12/2014 01:36 (GMT+01:00)

Para: Jose Garcia

Cc: AUDITORY@xxxxxxxxxxxxxxx

Asunto: Re: Wireless Audio for Research

Hi Jose,

Well, what if a step up DC-DC converter is used?

Tatsuya Hirahara

On Mon, 8 Dec 2014 12:34:01 +0100
Jose Garcia <J.Garcia@xxxxxxxxxxxxx> wrote:

> Hey Tatsuya!
> 
> if the receiver circuit is using a battery and of course it is using a DC ( power ) then not noise it will be there, at least since the power supply
> 
> Jose
>  
> On 08 Dec 2014, at 09:45, Tatsuya Hirahara <hirahara@xxxxxxxxxxxxxxx> wrote:
> 
> > Hi David,
> > 
> > If your target is 2ch-audio stream, the use of a wireless headphone
> > system could be one choice.
> > 
> > I had tested some wireless headphones a couple of years ago. They were
> > RS-220(details are unknown), RS-160 (Kleer), and PX360BT(Bluetooth). The
> > propagation signal delay was 21ms with RS-220, 46ms with RS-160, and
> > 61ms with PX360BT. (Wireless microphone system must have shorter
> > transmission delay than wireless headphones system.)
> > All the wireless headphones tested showed some additional noises when
> > they were powered ON. Although the noise levels were not so high, some
> > were audible. The origin of the noises is likely to be the power supply
> > circuit of the receiver unit. I've not confirmed it yet.
> > 
> > With regard to RS-220, qualities of its wireless audio signal
> > transmission system were OK; frequency range was 20 kHz and flat,
> > electrical cross talks were small and harmonic distortions were low
> > enough. And it can handle analog and digital inputs. Unfortunately,
> > RS-220 is not available in the market nowadays.
> > 
> > I took the RX-PCBs away from RS-220 body and reassembled them in a small
> > box to use it with any headphones. Then I have now wireless HDA200. I'm
> > not using it for psychoacoustical experiments though.
> > 
> > Tatsuya Hirahara
> > 
> > On Sun, 7 Dec 2014 01:13:05 +0000
> > "Landsberger, David" <David.Landsberger@xxxxxxxxx> wrote:
> > 
> >> Hi All,
> >> 
> >> I was wondering if anyone had thoughts about wireless audio connections
> >> for research.  We are running our spectral resolution task (SMRT;
> >> smrt.tigerspeech.com) on a small windows 8.1 tablet.  It would be nice
> >> for the audio to be transferred wireless to the speakers.  I am
> >> considered about degrading the signal quality.
> >> 
> >> Any suggestions on how to do this without adding signal noise or lossy
> >> data compression?  I understand bluetooth is not acceptable.  What
> >> about  using airplay, miracast, or chromecast?  Has anyone had luck /
> >> experience with these technologies for wireless PC audio streaming of
> >> quality acceptable for psychoacoustic research?
> >> 
> >> Thanks,
> >> David
> >> 
> > 
> > -------------------------------------
> > 平原　達也
> > 富山県立大学 工学部 知能デザイン工学科
> > Phone   0766-56-7500 ext. 459
> > e-mail  hirahara@xxxxxxxxxxxxxxx
> > URL:    http://auris.pu-toyama.ac.jp/
> > -------------------------------------

-------------------------------------
平原　達也
富山県立大学 工学部 知能デザイン工学科
Phone   0766-56-7500 ext. 459
e-mail  hirahara@xxxxxxxxxxxxxxx
URL:    http://auris.pu-toyama.ac.jp/
-------------------------------------