Re: achieving very low latency
Re: achieving very low latency
- Subject: Re: achieving very low latency
- From: Daphne Ippolito <email@hidden>
- Date: Wed, 04 Jul 2012 14:28:23 -0400
I've tried buffers of 32 bytes, and I still get ~30 ms of delay. I
don't think I can go much lower than that? I am using an only slightly
revised version of the sample code from the Learning Core Audio book.
-Daphne
On Wed, Jul 4, 2012 at 2:18 PM, Robert Martin <email@hidden> wrote:
> Use smaller buffers?
>
> On Jul 4, 2012, at 11:42 AM, Daphne Ippolito wrote:
>
>> In the experiment, a physical pushbutton is pressed (the old system used a
>> National Instruments card to record this; I am using an Arduino) that plays
>> a sound. I am referring to latency as the time between when the physical
>> button is pressed and when the sound outputs from the audio jack. I have
>> been measuring this with an oscilloscope.
>>
>> With Core Audio, I have not been able to get this time gap lower than 30
>> ms. I have tested the Arduino independently and it is not contributing more
>> than 1 ms of delay.
>>
>> This is my first time programming with audio, so I am still a bit unclear
>> on how it works. I've been told that I can't have more than 10 ms delay
>> between when the pushbutton is pressed and when the sound leaves the
>> speakers, and preferably less than 1 ms.
>>
>> Any advice on how I can accomplish this?
>
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