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> File transfer ... sound! | Good orderlies wander around.
loband_ml
Message#1
22.07.11, 12:19
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Actually remembered the bike of many years ago, between the two spectra had to pass the game. The perverts lived at different ends of the city, and the tapes are expensive ... As a result, one called the other, he turned on the tape recorder to record and the first one took out his tape from the computer and lost it. The total file is transferred!
I understand that this is a perversion. But you want it :) Please tell me which way to dig (are there any ready-made classes, code examples) for working with speakers and a microphone.

Transmission is carried out by tonality.
First is the heading-preparation (high-low-high-low with breaks of 200 milliseconds)

After a second, a piece of 64 bytes in length is transmitted. Breaks 125 milliseconds (25 per bit, 100 delay) (minimize errors with a lower speed, theoretically, you can still cut).

The result is, with minimal errors, we have a speed of 1 byte / second. But this is an option with ear sensitivity, the technique will work much faster :)

I repeat, are there any ready-made examples of working with speakers and a microphone, more specifically, working with tonality. Why do I not use the volume, is it 100,500 times lighter? Yes, because getting an error is much easier, you just need to get up from the chair while you are playing.

I do not know why I need this garbage. But this is fun!

Post has been editedloband_ml - 22.07.11, 12:21


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mgeee
Message#2
22.07.11, 13:08
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About the transfer itself - there is such a thing as a dialup ...


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loband_ml
Message#3
22.07.11, 14:22
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Transfer data via call? Even cooler.


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mgeee
Message#4
22.07.11, 18:17
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With a dial-up, the data is transmitted by sound, so you can not reinvent the wheel but take something ready and convert it to a bunch of speakers<->microphone.


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loband_ml
Message#5
22.07.11, 18:22
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With a dial-up, the data is transmitted by sound, so you can not reinvent the wheel but take something ready and convert it to a bunch of speakers<->microphone.


You see, I am writing this for the purpose of self-education.

Post has been editedloband_ml - 22.07.11, 21:09


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Message#6
22.07.11, 19:40
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Since for that matter, let's change the duty cycle ... because zazlichat different tones is more difficult than counting the time until the next pulse ...


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loband_ml
Message#7
22.07.11, 21:06
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different tones are harder than counting the time until the next pulse


And the fact of the matter is that we have tones in the simplest version 2, and in the most complex 8. Nothing complicated.


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Message#8
24.07.11, 01:36
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loband_ml,
This garbage, I thought here, but after all, color can be transferred somewhere 10-20 MB / s


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cepc
Message#9
24.07.11, 02:01
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100% agree with-WOLF-.
loband_ml
Message#10
24.07.11, 11:24
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This garbage, I thought here, but after all, color can be transferred somewhere 10-20 MB / s

You will not be able to perceive the color correctly by the camera, but to receive only 20-40 frames per second, the synchronization of the reception-transmission is also lame. And digital noise (not only the screen is visible, a bunch of extraneous objects?


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Message#11
24.07.11, 14:52
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you will not be able to perceive color correctly

256 colors completely.
20-40 frames per second

Yes, it is precisely this calculation.
synchronization of reception and transmission

Changing pictures is easy to "see."
digital noise (not only the screen is visible, a bunch of extraneous objects

The current cameras are about 5 megapixels, and the WVGA is only about 0.5.


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loband_ml
Message#12
24.07.11, 17:51
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256 colors completely.

The PDA camera in IDEAL conditions would not trust more than 32.
In normal - more than 8.
The current cameras are about 5 megapixels, and the WVGA is only about 0.5.

You will have to fix the receiver and transmitter, or divert the lion's share of resources to calculate the location of the screen.


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alkis3
Message#13
25.07.11, 13:46
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do not call color ...
chuppy
Message#14
25.07.11, 14:08
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So, was it possible to convey the hello dolly? Or do you write?


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loband_ml
Message#15
25.07.11, 14:26
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On the topic, no one answered, is there any where ready examples of parsing the tonalities and synthesizing sound


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Message#16
25.07.11, 16:45
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loband_ml,
So you just invent the modem.


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loband_ml
Message#17
25.07.11, 17:48
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loband_ml,
So you just invent the modem.

I repeat, are there any ready-made examples of working with speakers and a microphone, more specifically, working with tonality.

Essentially answer, please.


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tetrahc
Message#18
25.07.11, 17:57
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loband_ml @ 07.22.2011, 13:19*
Actually remembered the bike of many years ago, between the two spectra had to pass the game. The perverts lived at different ends of the city, and the tapes are expensive ... As a result, one called the other, he turned on the tape recorder to record and the first one took out his tape from the computer and lost it. The total file is transferred!

Unfortunately, the bike remained a bike, because The range of sound transmitted through the telephone network is already the voice range of the tape recorder. Roughly speaking, high-frequency and low-frequency signals were cut off.

But in principle, the idea is realizable. You need to start with Morse code - there is a tone - 0, there is no tone - 1. Well, take the old modem protocols to correct errors during transmission. There is something two bytes (preparation), 8 bytes of data, checksum

Well, then complicate.


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loband_ml
Message#19
25.07.11, 20:00
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I have a protocolI need an example of synthesizing and parsing sound (or library) on a PDA.


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-WOLF-
Message#20
25.07.11, 21:14
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loband_ml,
PWM? By the way, you will not be able to bring out the line.


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