Subject: Re: Wireless Audio for Research From: Tatsuya Hirahara <hirahara@xxxxxxxx> Date: Tue, 9 Dec 2014 09:36:01 +0900 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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@xxxxxxxx> 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@xxxxxxxx> 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@xxxxxxxx> 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@xxxxxxxx > > 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@xxxxxxxx URL: http://auris.pu-toyama.ac.jp/ -------------------------------------