Tune MeloTTS speed and prosody defaults

src/config.ts

@@ -24,7 +24,10 @@ const envSchema = z.object({
   TTS_LANGUAGE: z.string().min(1).default("KR"),
   TTS_SPEAKER: z.string().min(1).default("KR"),
   TTS_DEVICE: z.string().min(1).default("cpu"),
-  TTS_SPEED: z.coerce.number().min(0.5).max(2).default(1),
+  TTS_SPEED: z.coerce.number().min(0.5).max(2).default(1.18),
+  TTS_SDP_RATIO: z.coerce.number().min(0).max(1).default(0.22),
+  TTS_NOISE_SCALE: z.coerce.number().min(0).max(2).default(0.55),
+  TTS_NOISE_SCALE_W: z.coerce.number().min(0).max(2).default(0.75),
   TTS_CACHE_DIR: z.string().min(1).default(".local-ai/tts-cache"),
   TTS_OUTPUT_DIR: z.string().min(1).default(".local-ai/tts-output"),
   DEBUG: z

src/services/melo-tts.ts

@@ -57,7 +57,7 @@ export class MeloTtsService {
   }
 
   async speak(text: string): Promise<void> {
-    const trimmed = text.trim();
+    const trimmed = this.normalizeText(text);
     if (!trimmed) {
       return;
     }
@@ -113,6 +113,12 @@ export class MeloTtsService {
       this.config.TTS_SPEAKER,
       "--speed",
       String(this.config.TTS_SPEED),
+      "--sdp-ratio",
+      String(this.config.TTS_SDP_RATIO),
+      "--noise-scale",
+      String(this.config.TTS_NOISE_SCALE),
+      "--noise-scale-w",
+      String(this.config.TTS_NOISE_SCALE_W),
       "--device",
       this.config.TTS_DEVICE,
     );
@@ -122,10 +128,30 @@ export class MeloTtsService {
       language: this.config.TTS_LANGUAGE,
       speaker: this.config.TTS_SPEAKER,
       speed: this.config.TTS_SPEED,
+      sdp_ratio: this.config.TTS_SDP_RATIO,
+      noise_scale: this.config.TTS_NOISE_SCALE,
+      noise_scale_w: this.config.TTS_NOISE_SCALE_W,
       device: this.config.TTS_DEVICE,
     });
 
     const docker = await resolveDockerCommand(this.config);
     await run(docker, args, "inherit");
   }
+
+  private normalizeText(input: string): string {
+    const collapsed = input
+      .replace(/[`*_#>\[\]\(\)]/g, " ")
+      .replace(/\s+/g, " ")
+      .trim();
+
+    if (!collapsed) {
+      return "";
+    }
+
+    if (/[.!?…]$/.test(collapsed)) {
+      return collapsed;
+    }
+
+    return `${collapsed}.`;
+  }
 }