How can I change language on bing speech in bot

Question

I am using bing speech in botframeowrk as below:

var speechOptions = 
{
    speechRecognizer: new CognitiveServices.SpeechRecognizer(
    {
        subscriptionKey: 'YOUR_COGNITIVE_SPEECH_API_KEY'
    }),
    speechSynthesizer: new CognitiveServices.SpeechSynthesizer(
    {
        subscriptionKey: 'YOUR_COGNITIVE_SPEECH_API_KEY',
        gender: CognitiveServices.SynthesisGender.Female,
        voiceName: 'Microsoft Server Speech Text to Speech Voice (en-US, JessaRUS)'
    })
}

I want to change language from 'en-us' to some other language, is there any options that i should add like lang:'it-it'.

And also is there a way that i can change languages based on what language user speaks?

Answer 1

There are 2 different items: voice input (SpeechRecognizer) and voice output (SpeechSynthesizer)

SpeechRecognizer

There is an optional locale parameter that you can pass like you pass subscriptionKey, see sources:

export interface ICognitiveServicesSpeechRecognizerProperties {
    locale?: string,
    subscriptionKey?: string,
    fetchCallback?: (authFetchEventId: string) => Promise<string>,
    fetchOnExpiryCallback?: (authFetchEventId: string) => Promise<string>
}

There is a fallback if none provided (source):

const locale = properties.locale || 'en-US';

SpeechSynthesizer

Use gender and voiceName parameters (sources):

export interface ICognitiveServicesSpeechSynthesisProperties {
    subscriptionKey?: string,
    gender?: SynthesisGender,
    voiceName?: string,
    fetchCallback?: (authFetchEventId: string) => Promise<string>,
    fetchOnExpiryCallback?: (authFetchEventId: string) => Promise<string>
}

For the possible values for those parameters, you can find a list here: https://learn.microsoft.com/en-us/azure/cognitive-services/speech/api-reference-rest/bingvoiceoutput#SupLocales