音声ファイルをダウンロード

async function ttsDownloadFile(client: Cartesia): Promise<void> {
  const response = await client.tts.generate({
    model_id: 'sonic-latest',
    transcript: 'This audio will be downloaded as a file.',
    voice: { mode: 'id', id: '6ccbfb76-1fc6-48f7-b71d-91ac6298247b' },
    output_format: { container: 'wav', encoding: 'pcm_s16le', sample_rate: 44100 },
    language: 'en',
  });

  const blob = await response.blob();
  const url = URL.createObjectURL(blob);

  const a = document.createElement('a');
  a.href = url;
  a.download = 'speech.wav';
  a.click();

  URL.revokeObjectURL(url);
}