adhearsion-asr

Adds speech recognition support to Adhearsion as a plugin. Overrides CallController#ask and #menu to pass all recognition responsibility to the recognizer instead of invoking it multiple times.

Features

• #ask API from Adhearsion core supporting digit limits, terminators, timeouts, inline grammars and grammar references
• #menu API from Adhearsion core supporting DTMF input and recognition failure

Install

Add the following entry to your Adhearsion application's Gemfile:

gem 'adhearsion-asr'

Be sure to check out the plugin config by running rake config:show and adjust to your requirements.

By default, this plugin overrides Adhearsion core's implementations of #ask and #menu with its own. To turn off this behaviour, set the auto_include option (see rake config:show) to false and include manually in controllers like so:

class MyController < Adhearsion::CallController
  include AdhearsionASR::ControllerMethods
end

Examples

Simple collection of 5 DTMF digits

class MyController < Adhearsion::CallController
  def run
    result = ask limit: 5
    case result.status
    when :match
      speak "You entered #{result.utterance}"
    when :noinput
      speak "Hellooo? Anyone there?"
    when :nomatch
      speak "That doesn't make sense."
    end
  end
end

Collecting an arbitrary number of digits until '#' is received:

class MyController < Adhearsion::CallController
  def run
    result = ask terminator: '#'
    case result.status
    when :match
      speak "You entered #{result.utterance}"
    when :noinput
      speak "Hellooo? Anyone there?"
    when :nomatch
      speak "That doesn't make sense."
    end
  end
end

Collecting input from an inline speech grammar

class MyController < Adhearsion::CallController
  def run
    grammar = RubySpeech::GRXML.draw root: 'main', language: 'en-us', mode: :voice do
      rule id: 'main', scope: 'public' do
        one_of do
          item { 'yes' }
          item { 'no' }
        end
      end
    end

    result = ask grammar: grammar, input_options: { mode: :voice }
    case result.status
    when :match
      speak "You said #{result.utterance}"
    when :noinput
      speak "Hellooo? Anyone there?"
    when :nomatch
      speak "That doesn't make sense."
    end
  end
end

Collecting input from a speech grammar by URL

class MyController < Adhearsion::CallController
  def run
    result = ask grammar_url: 'http://example.com/mygrammar.grxml', input_options: { mode: :voice }
    case result.status
    when :match
      speak "You said #{result.utterance}"
    when :noinput
      speak "Hellooo? Anyone there?"
    when :nomatch
      speak "That doesn't make sense."
    end
  end
end

Executing a DTMF menu

class MyController < Adhearsion::CallController
  def run
    answer
    menu "Where can we take you today?", timeout: 8.seconds, tries: 3 do
      match 1, BooController
      match '2', MyOtherController
      match(3, 4) { pass YetAnotherController }
      match 5, FooController
      match 6..10 do |dialed|
        say_dialed dialed
      end

      timeout { do_this_on_timeout }

      invalid do
        invoke InvalidController
      end

      failure do
        speak 'Goodbye'
        hangup
      end
    end

    speak "This code gets executed unless #pass is used"
  end

  def say_dialed(dialed)
    speak "#{dialed} was dialed"
  end

  def do_this_on_timeout
    speak 'Timeout'
  end
end

Check out the API documentation for more details.

Links:

• Source
• Documentation
• Bug Tracker

Author

Ben Langfeld

Contributions

Adhearsion has a set of contribution guidelines which help to smooth the contribution process.

Copyright

Copyright (c) 2013 Adhearsion Foundation Inc. MIT LICENSE (see LICENSE for details).