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Old 06-23-2016, 10:33 AM   #136
geekmaster
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Quote:
Originally Posted by Doitsu View Post
But if I connect a Bluetooh headset with a smartphone or tablet won't the devices need to perform an audio-to-digital conversion first with an analog-to-digital converter before they can transmit the BT packets?
And unless the Kindle TTS module is capable of generating BT-compatible audio data packets, the Kindle would at least need an ADC.
There is no audio, even though digital data is used to REPRESENT audio inside the computer, and to a computer everything is just digital "numbers". The voice files are either digital already (in a file full of digital bits and bytes), or directly synthesized in software (also digital bits and bytes). Therefore, there is no analog audio to convert to digital -- no varying analog voltage "audio" until it drives the speaker element near your ear. All digital all the way to the amplifier at the output transducer (inside the bluetooth headset or speaker).

In essence, all a "sound card" really does is translate between digital and analog (with some analog amplification and filtering in the signal path), and without analog sound transducers (speakers or headphones) wired to a kindle, it has no need for such unused hardware as a "sound card". Even with a USB sound dongle, the "sound card" is in the dongle. And for sound output, the digital-to-analog converter can be as simple as an R-2R resistor ladder network.

Now regarding sound cards, a whole 'nother can of worms is opened up when you consider that sound is perceptual, and not "real" in the general sense. And that does not begin to consider the consequences of the theory that reality itself only exists while it is being consciously observed.

Last edited by geekmaster; 06-23-2016 at 10:55 AM.
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Old 06-23-2016, 11:11 AM   #137
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The last analog audio storage medium I used was audio cassette tape, and such devices do indeed require an ADC (analog-to-digital converter, such as in a sound card with audio input) to digitize the audio when importing it into a computer. However, for some time now (since mp3 players replaced portable audio cassette players), the sound data is stored in digital format, so no ADC needed (just a DAC) to play it. Analog on cassette tape, but digital all the way to just before the speakers or headset (which need analog audio to drive them), though in some cases audio transducers (speakers) can be driven directly with digital PWM and they do a mechanical digital-to-analog conversion all by themselves due to mechanical inertia (in which case there are no analog audio signals anywhere in the system).

The kindles do not contain analog data storage. Though some cameras do indeed contain analog values in their CCD image sensor). In fact, high-density flash devices are already storing multiple voltage levels, in a hybrid sort of way (i.e. MLC memory), but still not analog like CCD.

Last edited by geekmaster; 06-23-2016 at 01:33 PM.
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