receita.rb

Salva isso como mp3
http://www.receita.fazenda.gov.br/pessoajuridica/cnpj/cnpjreva/captcha/gerarSom.asp

Converte pra flac
http://stackoverflow.com/questions/18266785/sox-for-converting-flac-file-to-320-bit-mp3
sox input.mp3 output.flac

Envia para google speech e recebe um json
require 'json'
require 'net/http'
require 'uri'

def nethttp()
	url = "https://www.google.com/speech-api/v2/recognize?output=json&lang=pt-BR&key=apikey"
	uri = URI.parse(url);
	http = Net::HTTP.new(uri.host)
	request = Net::HTTP::Post.new(uri.request_uri)
	request.body = File.open('test.flac','rb').read
	request.content_type = 'audio/x-flac; rate=16000'
	res = http.request(request)
	# p res.body
	return res.body
end
p nethttp()