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Re: Speakers

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.arch.embedded
Subject Re: Speakers
Date 2020-11-06 14:59 -0800
Organization A noiseless patient Spider
Message-ID <87k0uyay6z.fsf@nightsong.com> (permalink)
References (1 earlier) <87d00r1kh5.fsf@nightsong.com> <ro2dfj$1640$1@gioia.aioe.org> <d053b21f-e04f-45a6-ad9d-3aa5f885651ao@googlegroups.com> <87o8kbauxl.fsf@nightsong.com> <d6dad414-d034-459e-b393-f3c84743c4dao@googlegroups.com>

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Rick C <gnuarm.deletethisbit@gmail.com> writes:
> Why do people post unresponsive advice?  
> "So it will be driven by square waves at a few different frequencies."

Pulse the high frequency sounder on and off at 250 hz, was the
suggestion.  Does that not get a 250 hz fundamental?  I'll try it (in
software) when I get home.  Similarly with other pulse frequencies.

Lots of small speakers are available on those sites I linked, including
some with little enclosures that should acoustically amplify the sound.

If you think a laptop or phone speaker sounds ok, then the first thing
I'd do is measure its frequency response.  Just recording a sample with
a decent microphone and using Audacity's built-in spectrum analyzer
feature is a reasonable start.  If you can measure the SPL, that is
great, but otherwise check whether it's still loud enough from say 20
feet away.

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Thread

Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-05 14:25 -0800
  Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-05 14:56 -0800
    Re: Speakers John Speth <johnspeth@yahoo.com> - 2020-11-05 18:47 -0800
      Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-05 21:15 -0800
        Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-05 21:57 -0800
          Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 08:08 -0800
            Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-06 14:59 -0800
              Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 17:48 -0800
                Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-07 01:02 -0800
              Re: Speakers upsidedown@downunder.com - 2020-11-07 06:47 +0200
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-06 21:23 -0800
                Re: Speakers Michael Kellett <mk@mkesc.co.uk> - 2020-11-07 13:12 +0000
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-07 08:05 -0800
                Re: Speakers Rick C <gnuarm.deletethisbit@gmail.com> - 2020-11-07 18:35 -0800
                Re: Speakers Paul Rubin <no.email@nospam.invalid> - 2020-11-07 21:57 -0800
  Re: Speakers "Mat Nieuwenhoven" <mnieuw@zap.a2000.nl> - 2020-11-08 10:03 +0100

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