Not that simple !
The encoder outputs a digital data stream at 1/33rd of its oscillator frequency.
If you wish to transmit this as 'audio' then it needs further processing to make it look like audio.
-There are no guarantees on this- but I reckon ...
If you set the osc frequency to something like 1kHz/8*33 (about 4.1kHz)
and arrange the digital output to enable a 1kHz oscillator whenever there is a logic '1';
As the transmitter generates an output bit of 1/33rd of its osc frequency the audio osc will generate about 8 cycles of audio (with me so far ?), this can be transmitted as audio.
The reciever will produce a series of 1kHz 'bursts', the shortest of which will be about 8 cycles, 8ms long. A detector can now resolve this back to a digital signal by simply detecting sound/no sound.
I chose 1kHz as it is easily in the audio band, 8 cycles should give a timing resolution that the decoder can deal with.