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From: kludge@panix.com (Scott Dorsey)
Newsgroups: rec.arts.sf.written
Subject: Re: pseudo-YASID:  Spang on, but no cigar
Date: 24 Dec 2024 13:18:35 -0000
Organization: Former users of Netcom shell (1989-2000)
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Message-ID: <vkecbb$dum$1@panix2.panix.com>
References: <5i9kmjpsetcoes1kiquoat7g4jsbhradg9@4ax.com> <slrnvml7ag.22ht.naddy@lorvorc.mips.inka.de>
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Christian Weisgerber  <naddy@mips.inka.de> wrote:
>On 2024-12-24, Joy Beeson <jbeeson@invalid.net.invalid> wrote:
>
>> I also said that a terminal that included a sound system would be
>> twice as bulky as everyone else's.  (The length of sound waves
>> controls  the sizes of microphones and speakers, so they can't be
>> tiny.)
>
>Tell us more.  The traditional frequency band for transmission of
>human voice is 300 to 3,400 Hz, which in air corresponds to wavelengths
>of about 0.1 to 1.1 meters.

This sets the limit of an efficient voice-grade speaker in free air to 
about the size of a transistor radio.  If you want to make it smaller,
you either need to stop working in free air (like using earplugs) or use 
long folded tubes and sacrifice a lot of efficiency (which is what cellphone
speakers do.)

You can draw a triangle with regard to speakers: each apex marked 
SIZE, LF EXTENSION, and EFFICIENCY.  You can be anywhere inside the
triangle but you can't get out of it.
--scott


-- 
"C'est un Nagra. C'est suisse, et tres, tres precis."