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Re: Wireless Audio for Research

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

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/
> -------------------------------------