聲音不再像收音機：Hearthlen 改用 Piper 的 en_US-lessac-medium

The Voice Stopped Sounding Like a Radio

“Hi, Savindu.” came back in 1939 milliseconds, and the voice was no longer the flat low-quality one.

Savindu Thathsara, savithathsara.me. This is a Hearthlen note from the same ThinkPad.

What changed

The earlier voice was Piper’s en_GB-alan-low. Low is small and fast, and it sounds flat. The new file is en_US-lessac-medium, a narrator recording at medium quality, 63,201,294 bytes. Speech is a little slower than the default, and there is a quarter-second of quiet after a sentence, so “Hi, Savindu.” has a breath in the comma.

A longer line, “Hi, Savindu. What would you like me to do?”, made 3.21 seconds of audio and returned in 3753 ms. The greeting itself, synthesis plus playback, was 1939 ms. That sits next to the old short-sentence figure of 2048 ms in the reaction notes. The face still moves while this plays, as in the pointer note.

The listener was restarted. The next “hey Hearthlen” uses this voice.

Savindu Thathsara builds practical AI and automation in London. This series is the public log of an offline AI operating system he is writing and learning at the same time.