On Fri, 30 Sep 2005 17:24:43 -0400, Jerry Avins <[email protected]> wrote:

>Stewart Pinkerton wrote:
>> On Fri, 30 Sep 2005 11:32:09 -0400, Jerry Avins <[email protected]> wrote:
>>
>>
>>>Richard Crowley wrote:
>>>
>>>>>* Pulse Code Modulation, the most common digital format.
>>>>
>>>>
>>>>PCM is not a "format" it is just a $3 phrase that means "digital".
>>>
>>>PWM is also digital.
>>
>>
>> Ahem, PWM isn't necessarily digital - remember the wonderful Sinclair
>> X-10 amplifier from the mid '60s?
>
>No. please describe it.

Class D amp using germanium small-signal transistors, rated at 10
watts, actualy produced about 3 watts, rated at 0.1% THD at full power
- unfortunately, those were switching artifacts which stayed at the
same level regardless of output, so the whole thing sounded absolutely
dreadful! Lasted for about a year on the market, and was followed by a
whole slew of highly novel but ultimately trashy Sinclair products.

Clive Sinclair (who didn't actually design the X-10) is a true
innovative genius - who couldn't nail together two pieces of wood,
never mind produce reliable electronic gear.
--

Stewart Pinkerton | Music is Art - Audio is Engineering