talk.dev Voice AI Use Cases & Real-World Examples

// Professional audiobook production workflow
import { TalkAI } from "@talk/ai-sdk";

class AudiobookProducer {
  private client: TalkAI;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  async produceAudiobook(
    chapters: string[],
    narratorVoice: string = "emma-storytelling"
  ) {
    console.log(
      `Starting audiobook production with ${chapters.length} chapters...`
    );

    const audioChapters = await Promise.all(
      chapters.map(async (chapter, index) => {
        console.log(`Processing chapter ${index + 1}/${chapters.length}`);

        return this.client.synthesize({
          text: chapter,
          voice: narratorVoice,
          emotion: "narrative",
          speed: 0.95, // Slightly slower for audiobooks
          format: "wav",
          quality: "ultra",
        });
      })
    );

    // Calculate total cost and time savings vs ElevenLabs
    const totalCharacters = chapters.join("").length;
    const talkdevCost = (totalCharacters * 0.002) / 1000;
    const elevenlabsEquivalent = (totalCharacters * 0.004) / 1000;
    const savings = elevenlabsEquivalent - talkdevCost;

    console.log(`Audiobook complete!`);
    console.log(
      `Total cost: $${talkdevCost.toFixed(2)} (vs ElevenLabs: $${elevenlabsEquivalent.toFixed(2)})`
    );
    console.log(`Savings: $${savings.toFixed(2)} (50% cost reduction)`);

    return {
      chapters: audioChapters,
      cost: talkdevCost,
      savings: savings,
      production_time: audioChapters.reduce(
        (acc, ch) => acc + ch.processing_time,
        0
      ),
    };
  }

  // Custom narrator voice from author's sample
  async createCustomNarrator(audioSample: File, name: string) {
    const clone = await this.client.voices.clone({
      name: `${name} Narrator Voice`,
      audioFile: audioSample,
      consentVerified: true,
    });

    // Wait for voice cloning (2-5 minutes vs ElevenLabs 5-15 minutes)
    const customVoice = await this.client.voices.waitForClone(clone.clone_id);

    return customVoice.voice_id;
  }
}

// Usage example
const producer = new AudiobookProducer("your-api-key");

// Example: 300-page novel
const bookChapters = [
  "Chapter 1: The mysterious letter arrived on a Tuesday morning...",
  "Chapter 2: Sarah couldn't believe what she was reading...",
  // ... more chapters
];

const audiobook = await producer.produceAudiobook(bookChapters);

// Podcast production with live capabilities
class PodcastStudio {
  private client: TalkAI;
  private stream: any;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  // Pre-recorded segments
  async createPodcastSegments(scripts: {
    intro: string;
    outro: string;
    ads: string[];
  }) {
    const hostVoice = "david-podcast"; // Professional podcast voice

    const segments = await Promise.all([
      // Intro with enthusiastic energy
      this.client.synthesize({
        text: scripts.intro,
        voice: hostVoice,
        emotion: "enthusiastic",
        speed: 1.05,
        format: "mp3",
      }),

      // Outro with warm conclusion
      this.client.synthesize({
        text: scripts.outro,
        voice: hostVoice,
        emotion: "warm",
        speed: 0.98,
        format: "mp3",
      }),

      // Ad reads with professional tone
      ...scripts.ads.map((ad) =>
        this.client.synthesize({
          text: ad,
          voice: hostVoice,
          emotion: "professional",
          speed: 1.0,
          format: "mp3",
        })
      ),
    ]);

    return {
      intro: segments[0],
      outro: segments[1],
      ads: segments.slice(2),
    };
  }

  // Live streaming for real-time podcast narration
  async startLiveNarration(voice: string = "sarah-news") {
    this.stream = this.client.createStream({
      voice: voice,
      format: "webm",
      quality: "high",
      onAudioChunk: (chunk) => {
        // Stream to podcast software (OBS, etc.)
        this.sendToOBS(chunk);
      },
    });

    return this.stream;
  }

  async addLiveNarration(text: string) {
    if (this.stream) {
      await this.stream.addText(text);
    }
  }

  private sendToOBS(audioChunk: ArrayBuffer) {
    // Integration with OBS or other streaming software
    // This enables live AI narration during podcast recording
  }
}

// Example usage
const studio = new PodcastStudio("your-api-key");

// Pre-produce segments
const segments = await studio.createPodcastSegments({
  intro:
    "Welcome to TechTalk, where we explore the latest in artificial intelligence!",
  outro:
    "Thanks for listening! Don't forget to subscribe and we'll see you next week.",
  ads: [
    "This episode is sponsored by CloudHost - reliable hosting for your applications.",
    "Need a website? Try WebBuilder Pro for a free 30-day trial.",
  ],
});

// Live narration during recording
const liveStream = await studio.startLiveNarration();
await studio.addLiveNarration("And now, let's dive into today's topic...");

// YouTube content automation
class YouTubeVoiceOver {
  private client: TalkAI;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  // Educational content with clear explanation
  async createTutorialNarration(script: string, subject: string) {
    const educatorVoice = subject.includes("tech")
      ? "alex-tech-educator"
      : "sarah-educator";

    return this.client.synthesize({
      text: script,
      voice: educatorVoice,
      emotion: "educational",
      speed: 0.9, // Slower for educational content
      format: "wav",
      quality: "high",
    });
  }

  // News-style content with urgency
  async createNewsNarration(script: string) {
    return this.client.synthesize({
      text: script,
      voice: "david-news",
      emotion: "urgent",
      speed: 1.1,
      format: "mp3",
    });
  }

  // Batch process multiple videos
  async batchProcessVideos(
    videos: Array<{ title: string; script: string; type: "tutorial" | "news" }>
  ) {
    console.log(`Processing ${videos.length} videos...`);

    const results = await Promise.all(
      videos.map(async (video) => {
        const startTime = Date.now();

        const audio =
          video.type === "tutorial"
            ? await this.createTutorialNarration(video.script, video.title)
            : await this.createNewsNarration(video.script);

        const processingTime = Date.now() - startTime;

        return {
          title: video.title,
          audio: audio,
          processing_time: processingTime,
          cost: (video.script.length * 0.002) / 1000, // talk.dev pricing
        };
      })
    );

    const totalCost = results.reduce((sum, r) => sum + r.cost, 0);
    const avgProcessingTime =
      results.reduce((sum, r) => sum + r.processing_time, 0) / results.length;

    console.log(
      `Batch complete! Average processing: ${avgProcessingTime}ms per video`
    );
    console.log(`Total cost: $${totalCost.toFixed(2)} (50% less)`);

    return results;
  }
}

// Game character voice system
class GameVoiceEngine {
  private client: TalkAI;
  private characterVoices: Map<string, string>;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
    this.setupCharacterVoices();
  }

  private setupCharacterVoices() {
    this.characterVoices = new Map([
      ["hero", "knight-brave"],
      ["wizard", "mage-wise"],
      ["merchant", "trader-friendly"],
      ["villain", "dark-lord"],
      ["narrator", "epic-storyteller"],
    ]);
  }

  // Dynamic dialogue generation during gameplay
  async speakCharacterLine(
    characterId: string,
    dialogue: string,
    emotion?: string
  ) {
    const voice = this.characterVoices.get(characterId) || "default-npc";

    return this.client.synthesize({
      text: dialogue,
      voice: voice,
      emotion: emotion || "neutral",
      format: "ogg", // Optimized for games
      quality: "standard", // Balance quality/file size
    });
  }

  // Real-time dialogue for interactive NPCs
  async startInteractiveNPC(characterId: string) {
    const voice = this.characterVoices.get(characterId);

    return this.client.createStream({
      voice: voice,
      format: "webm",
      onAudioChunk: (chunk) => {
        // Play through game audio system
        this.playGameAudio(chunk);
      },
    });
  }

  // Batch generate cutscene dialogue
  async generateCutscene(
    scenes: Array<{ character: string; line: string; emotion?: string }>
  ) {
    const audioLines = await Promise.all(
      scenes.map((scene) =>
        this.speakCharacterLine(scene.character, scene.line, scene.emotion)
      )
    );

    return audioLines;
  }

  // Create custom character voice from voice actor sample
  async createCustomCharacterVoice(
    characterName: string,
    voiceActorSample: File
  ) {
    const clone = await this.client.voices.clone({
      name: `${characterName} Character Voice`,
      audioFile: voiceActorSample,
      consentVerified: true,
    });

    const customVoice = await this.client.voices.waitForClone(clone.clone_id);
    this.characterVoices.set(characterName.toLowerCase(), customVoice.voice_id);

    return customVoice.voice_id;
  }

  private playGameAudio(audioChunk: ArrayBuffer) {
    // Integration with game audio engine (Unity, Unreal, etc.)
  }
}

// Example usage in game
const gameVoice = new GameVoiceEngine("your-api-key");

// Dynamic NPC interaction
const npcStream = await gameVoice.startInteractiveNPC("merchant");
await npcStream.addText("Welcome, traveler! What brings you to my shop?");

// Cutscene generation
const cutsceneDialogue = await gameVoice.generateCutscene([
  { character: "hero", line: "The kingdom is in danger!", emotion: "urgent" },
  {
    character: "wizard",
    line: "Yes, I sense a great darkness approaching.",
    emotion: "serious",
  },
  {
    character: "hero",
    line: "We must find the ancient artifact.",
    emotion: "determined",
  },
]);

// E-learning platform integration
class LearningVoiceSystem {
  private client: TalkAI;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  // Multi-language course generation
  async createMultilingualCourse(content: {
    title: string;
    modules: Array<{ name: string; content: string }>;
    languages: string[];
  }) {
    const languageVoices = {
      "en-US": "sarah-educator",
      "es-ES": "maria-profesora",
      "fr-FR": "claire-instructeur",
      "de-DE": "anna-lehrerin",
      "ja-JP": "yuki-sensei",
    };

    const coursesPerLanguage = await Promise.all(
      content.languages.map(async (lang) => {
        const voice = languageVoices[lang] || "sarah-educator";

        const moduleAudios = await Promise.all(
          content.modules.map(async (module) => {
            // In real implementation, would translate content
            const translatedContent = await this.translateContent(
              module.content,
              lang
            );

            return this.client.synthesize({
              text: translatedContent,
              voice: voice,
              emotion: "educational",
              speed: 0.9, // Slower for learning
              format: "mp3",
            });
          })
        );

        return {
          language: lang,
          modules: moduleAudios,
        };
      })
    );

    return coursesPerLanguage;
  }

  // Interactive quiz narration
  async createQuizNarration(
    questions: Array<{ question: string; options: string[] }>
  ) {
    return Promise.all(
      questions.map(async (q, index) => {
        const questionText = `Question ${index + 1}: ${q.question}. 
                             Option A: ${q.options[0]}. 
                             Option B: ${q.options[1]}. 
                             Option C: ${q.options[2]}. 
                             Option D: ${q.options[3]}.`;

        return this.client.synthesize({
          text: questionText,
          voice: "alex-quiz-host",
          emotion: "engaging",
          speed: 0.95,
          format: "mp3",
        });
      })
    );
  }

  // Accessibility features - text-to-speech for visually impaired
  async createAccessibleContent(content: string) {
    return this.client.synthesize({
      text: content,
      voice: "accessibility-clear", // High clarity voice
      emotion: "neutral",
      speed: 0.8, // Slower for accessibility
      format: "wav",
      quality: "ultra", // Highest quality for accessibility
    });
  }

  private async translateContent(
    content: string,
    targetLang: string
  ): Promise<string> {
    // Integration with translation service
    // In practice, would use Google Translate API or similar
    return content; // Placeholder
  }
}

// Customer service voice automation
class CustomerServiceVoice {
  private client: TalkAI;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  // Real-time customer support responses
  async handleCustomerInquiry(inquiry: string, customerData: any) {
    // Generate personalized response
    const response = await this.generateResponse(inquiry, customerData);

    // Convert to speech with appropriate tone
    const emotion = this.determineResponseTone(inquiry);

    return this.client.synthesize({
      text: response,
      voice: "customer-service-professional",
      emotion: emotion,
      speed: 1.0,
      format: "mp3",
    });
  }

  // Interactive voice response (IVR) system
  async createIVRMenu(
    menuItems: Array<{ option: number; description: string }>
  ) {
    const menuText = `Thank you for calling. Please listen carefully as our menu options have changed. ${menuItems
      .map((item) => `Press ${item.option} for ${item.description}`)
      .join(". ")}. Or stay on the line to speak with a representative.`;

    return this.client.synthesize({
      text: menuText,
      voice: "ivr-professional",
      emotion: "helpful",
      speed: 0.9,
      format: "wav",
    });
  }

  // Batch generate FAQ responses
  async generateFAQAudio(faqs: Array<{ question: string; answer: string }>) {
    return Promise.all(
      faqs.map(async (faq) => {
        const combinedText = `Question: ${faq.question}. Answer: ${faq.answer}`;

        return {
          question: faq.question,
          audio: await this.client.synthesize({
            text: combinedText,
            voice: "support-friendly",
            emotion: "helpful",
            format: "mp3",
          }),
        };
      })
    );
  }

  private determineResponseTone(inquiry: string): string {
    if (
      inquiry.toLowerCase().includes("problem") ||
      inquiry.includes("issue")
    ) {
      return "empathetic";
    } else if (inquiry.toLowerCase().includes("thank")) {
      return "warm";
    } else {
      return "professional";
    }
  }

  private async generateResponse(
    inquiry: string,
    customerData: any
  ): Promise<string> {
    // In practice, would integrate with AI response generation
    return `Thank you for your inquiry about ${inquiry}. Let me help you with that.`;
  }
}

// Marketing voice-over production
class AdVoiceProduction {
  private client: TalkAI;

  constructor(apiKey: string) {
    this.client = new TalkAI(apiKey);
  }

  // Create ad variations for A/B testing
  async createAdVariations(
    baseScript: string,
    variations: string[],
    voice: string = "commercial-male"
  ) {
    const allScripts = [baseScript, ...variations];

    const adVersions = await Promise.all(
      allScripts.map(async (script, index) => {
        return {
          version: index === 0 ? "original" : `variation_${index}`,
          audio: await this.client.synthesize({
            text: script,
            voice: voice,
            emotion: "persuasive",
            speed: 1.05, // Slightly faster for ads
            format: "mp3",
          }),
          script: script,
        };
      })
    );

    return adVersions;
  }

  // Multi-demographic targeting with different voices
  async createTargetedCampaign(script: string, demographics: string[]) {
    const voiceMapping = {
      young_male: "trendy-male-20s",
      young_female: "trendy-female-20s",
      professional_male: "executive-male",
      professional_female: "executive-female",
      senior: "mature-trustworthy",
    };

    return Promise.all(
      demographics.map(async (demo) => {
        const voice = voiceMapping[demo] || "commercial-neutral";

        return {
          demographic: demo,
          audio: await this.client.synthesize({
            text: script,
            voice: voice,
            emotion: "engaging",
            format: "wav",
          }),
        };
      })
    );
  }

  // Product launch campaign with emotional journey
  async createProductLaunchCampaign(campaign: {
    teaser: string;
    announcement: string;
    features: string;
    callToAction: string;
  }) {
    const phases = [
      { phase: "teaser", text: campaign.teaser, emotion: "mysterious" },
      {
        phase: "announcement",
        text: campaign.announcement,
        emotion: "excited",
      },
      { phase: "features", text: campaign.features, emotion: "confident" },
      { phase: "cta", text: campaign.callToAction, emotion: "urgent" },
    ];

    return Promise.all(
      phases.map(async (phase) => {
        return {
          phase: phase.phase,
          audio: await this.client.synthesize({
            text: phase.text,
            voice: "brand-spokesperson",
            emotion: phase.emotion,
            speed: 1.1,
            format: "mp3",
          }),
        };
      })
    );
  }
}

// Real-world performance comparison
class PerformanceAnalysis {
  private talkdevClient: TalkAI;

  constructor() {
    this.talkdevClient = new TalkAI("your-api-key");
  }

  async compareWithElevenLabs(testScripts: string[]) {
    console.log("Running performance comparison with ElevenLabs...");

    const results = {
      talkdev: { total_time: 0, total_cost: 0, avg_latency: 0 },
      elevenlabs: { estimated_time: 0, estimated_cost: 0, avg_latency: 200 }, // Estimated
      comparison: { time_savings: 0, cost_savings: 0, latency_improvement: 0 },
    };

    // Test talk.dev performance
    const startTime = Date.now();
    const talkdevResults = await Promise.all(
      testScripts.map(async (script) => {
        const synthStart = Date.now();
        const audio = await this.talkdevClient.synthesize({
          text: script,
          voice: "sarah-professional",
          format: "mp3",
        });
        const synthTime = Date.now() - synthStart;

        return {
          processing_time: synthTime,
          cost: (script.length * 0.002) / 1000, // talk.dev pricing
          characters: script.length,
        };
      })
    );

    results.talkdev.total_time = Date.now() - startTime;
    results.talkdev.total_cost = talkdevResults.reduce(
      (sum, r) => sum + r.cost,
      0
    );
    results.talkdev.avg_latency =
      talkdevResults.reduce((sum, r) => sum + r.processing_time, 0) /
      talkdevResults.length;

    // Calculate ElevenLabs estimates
    const totalCharacters = testScripts.join("").length;
    results.elevenlabs.estimated_cost = (totalCharacters * 0.004) / 1000; // ElevenLabs pricing
    results.elevenlabs.estimated_time = testScripts.length * 250; // Estimated 250ms per request

    // Calculate improvements
    results.comparison.cost_savings =
      ((results.elevenlabs.estimated_cost - results.talkdev.total_cost) /
        results.elevenlabs.estimated_cost) *
      100;
    results.comparison.latency_improvement =
      ((results.elevenlabs.avg_latency - results.talkdev.avg_latency) /
        results.elevenlabs.avg_latency) *
      100;

    console.log(`\n=== Performance Comparison Results ===`);
    console.log(
      `talk.dev - Avg Latency: ${results.talkdev.avg_latency.toFixed(0)}ms, Cost: $${results.talkdev.total_cost.toFixed(3)}`
    );
    console.log(
      `ElevenLabs - Estimated Latency: ${results.elevenlabs.avg_latency}ms, Cost: $${results.elevenlabs.estimated_cost.toFixed(3)}`
    );
    console.log(`\n🚀 talk.dev Advantages:`);
    console.log(
      `  • ${results.comparison.latency_improvement.toFixed(1)}% faster synthesis`
    );
    console.log(
      `  • ${results.comparison.cost_savings.toFixed(1)}% cost savings`
    );
    console.log(`  • Real-time streaming capabilities`);
    console.log(`  • Better developer experience\n`);

    return results;
  }
}

// Run comparison
const analysis = new PerformanceAnalysis();
const testScripts = [
  "Hello world, this is a test of voice synthesis performance.",
  "The quick brown fox jumps over the lazy dog.",
  "Artificial intelligence is transforming how we create and consume content.",
  "Welcome to the future of voice synthesis technology.",
];

await analysis.compareWithElevenLabs(testScripts);