Re: Are purely-analog audio devices immune to aliasing?

"Randy Yates" <yates@[EMAIL PROTECTED]
> wrote in message 
news:m31w46svgx.fsf@[EMAIL PROTECTED]
> "Chronic Philharmonic" <karl.uppiano@[EMAIL PROTECTED]
> writes:
>
>> "Randy Yates" <yates@[EMAIL PROTECTED]
> wrote in message
>> news:m3k5hzj58s.fsf@[EMAIL PROTECTED]
>>> "Green Xenon [Radium]" <glucegen1@[EMAIL PROTECTED]
> writes:
>>>
>>>> Hi:
>>>>
>>>> Is it true that purely-analog audio devices [such as analog cassette,
>>>> AM radio, and the pre-digital telephone systems*] are immune to
>>>> aliasing?
>>>
>>> Yes.
>>
>> Well... AM radio is not immune to aliasing, although we rarely
encounter 
>> it
>> in practice
>
> How would AM ever alias?

Sorry, I was thinking of multiplexing using AM, where the sidebands would 
overlap adjacent channels if the modulating frequency is not band limited
to 
1/2 the carrier spacing (as it happens on the AM Broadcast band at night).
A 
single isolated AM transmitter would not alias into its own baseband.