Timeline for Send analog audio through the rs232 port of a data transmitter
Current License: CC BY-SA 3.0
15 events
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| Jan 21, 2016 at 9:58 | history | edited | Marcus Müller | CC BY-SA 3.0 |
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| Jan 21, 2016 at 9:55 | comment | added | Marcus Müller | @magic7music: that is the relevant number, obviously! | |
| Jan 21, 2016 at 8:26 | comment | added | magic7music | Channel Rate 4,000 to 19,200 bps - GMSK Data Protocol Transparent or Packet (AirNet) | |
| Jan 21, 2016 at 7:43 | comment | added | Marcus Müller | @magic7music that's the rs232 link, but how many bits per second can the radio actually transmit, on average? | |
| Jan 21, 2016 at 7:16 | comment | added | magic7music | Data Rates 300, 1200, 2400, 4800, 9600, 19200, 38400 baud Data Interface Data Format Asynchronous, Word Length: 7 or 8 bits, Parity: Even, Odd or None Signal Levels RS-232 (Port 1 and 2), TTL (Port 1 only), RS-485 (with adapter) Handshake Protocols Full Handshake: S upports RTS, CTS, DCD, DSR, DTR Data Activation (3 wire): Requires only TXD, RXD and SG Data Only Time Out 1 to 500 character periods | |
| Jan 20, 2016 at 21:11 | comment | added | magic7music | tomorrow I will post the specs of the RX TX modul and the RS232 prot. that they use. | |
| Jan 20, 2016 at 18:54 | history | edited | Marcus Müller | CC BY-SA 3.0 |
added 188 characters in body
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| Jan 20, 2016 at 18:53 | comment | added | Marcus Müller | @Tut: yes, I should state that more clearly | |
| Jan 20, 2016 at 18:49 | comment | added | Tut | Many (if not most) commercial devices that use RS232 only use the asynchronous protocols. That said, I think your equations are overly optimistic (and miss-leading) unless you have seen technical data for the transmitter and receiver. | |
| Jan 20, 2016 at 18:43 | comment | added | Marcus Müller | @Tut start and stop bits often are subject to configuration. You can do completely without. | |
| Jan 20, 2016 at 18:18 | comment | added | Tut | Although I don't believe it is technically in the spec, normally RS232 communications use an asynchronous protocol that would require at least 10 bits per data byte (includes start and stop bit). | |
| Jan 20, 2016 at 16:37 | comment | added | Marcus Müller | What Scott said, @magic7music. You can not send understandable audio over a 38.4kbit/s link without employing compression; there's mathematical proof it's impossible. Doing compression is a hell of a job for a one man show, unless you've done something like this before, which you, I might quite frankly say, you don't ever seem to have done. There's a lot to be considered, and a lot of theory to be understood before you get into psychoacoustics, source coding, channel coding and audio decoding. | |
| Jan 20, 2016 at 16:24 | comment | added | Scott Seidman | @magic7music "ambitious" and "not mathematically possible" are two different things. | |
| Jan 20, 2016 at 16:18 | comment | added | magic7music | I know it is ambitious but that's what it's all about. I can buy some digital Radios but it`s not the same as building it myself with a little helpfrom my online friends. | |
| Jan 20, 2016 at 16:12 | history | answered | Marcus Müller | CC BY-SA 3.0 |