﻿Amitaro's ITA Corpus Voice Recording — Normal  Ver.2.2  Updated: 2026-06-05

About this corpus: https://amitaro.net/voice/corpus-list/

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Contents

  1. About this corpus
  2. Differences from Ver.1
  3. All available styles
  4. Recording environment
  5. Update history

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1. About this corpus

This collection contains voice recordings of all 424 sentences from the
ITA Corpus, a publicly available Japanese text corpus released in the
public domain, read aloud by Amitaro.

Format: WAV, PCM 48,000 Hz / 16-bit / Mono
        and PCM 44,100 Hz / 16-bit / Mono (both included)
Use the 44,100 Hz version for MYCOEIROINK training or combining with
dialogue voice materials.

  ITA Corpus sentence list: https://github.com/mmorise/ita-corpus

Recorded over several sessions in a home recording studio.
Each sentence was recorded in 3–19 takes (average 5.4), then manually
de-noised in RX8 Standard (pop noise, lip noise, breath noise removed).
The most stable take was selected, or stable segments from different
takes were spliced together.

The recordings are not raw or unedited, but they are highly stable and
suitable for use directly in voice synthesis training.

Raw unedited files (2,291 files / 858 MB) are also available.
Contact Amitaro if you need them (for voice synthesis research only).

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2. Differences from Ver.1

Ver.2 was recorded after the recording studio walls were covered with
thick curtains to reduce room reflections. All audio is entirely new.
The delivery is also slightly more natural due to greater familiarity
with the corpus.

Details: https://amitaro.net/wp/20220419_01/

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3. All available styles

"Amitaro's ITA Corpus Voice Recording" is available in the following styles.

  [All 424 ITA Corpus sentences]
  - Normal (this zip) … Precise, clearly articulated — optimized for TTS
                         and accessibility use cases
  - Runrun            … Upbeat, bouncy delivery — like sharing good news
  - Yofukashi         … Natural, calm speech — late-night radio style
  - Punsuka           … Animated "trying-to-be-angry" character voice

  [ITA Corpus emotion 100 sentences only]
  - Sasayaki A        … Hushed whisper — heavy on breathiness
  - Sasayaki B        … Whisper with more of Amitaro's natural voice character

  Full list: https://amitaro.net/voice/corpus-list/

MANA Corpus and AMITARO Corpus voice recordings are also available.

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4. Recording environment

  Room                 Home recording studio
  Microphone           audio-technica AT4040 (condenser)
  Audio interface      Steinberg UR242
  Pop filter           STEDMAN PROSCREEN XL (metal)
  Headphones           audio-technica ATH-SX1a
  Reflection filter    CLASSIC PRO CAR900

The studio is a custom-built room (~2.4 tatami / ~3.8 m²) with
cellulose fiber insulation inside all walls, acoustic wall panels
covered with thick curtains, carpet flooring, and sound-deadening
ceiling panels. A gap between the studio floor and the ceiling below
reduces low-frequency transmission.

Acoustic measurements by Prof. Masanori Morise (formerly Yamanashi
University, now Meiji University) confirmed that room reflections are
comparable to a professional recording studio.
(Measurement was taken before the curtain modification.)

Measurement data:

  A-weighted noise level:  18.5 dB  (Rion NL-52EX)
  Reverberation time T60:  220 ms

  T60 estimated by impulse integration method [1].
  Impulse response measured by TSP method [2].
  Sampling rate: 48 kHz, 24-bit.
  TSP length: 524,288 samples (~10.82 s).

  Measured by: Masanori Morise

Details: https://amitaro.net/about/aboutrec/

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5. Update history

  2026-06-05  Ver.2.2  Added 44,100 Hz version
  2022-05-23  Ver.2.1  recitation243 and recitation307 re-recorded
                       (mispronunciation fixes)
  2022-05-17  Ver.2.0  Entirely re-recorded with improved studio setup
  2022-02-07  Ver.1.1  recitation209 re-recorded; emoNormal011 re-recorded
  2021-11-03  Ver.1.0  Initial release

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Amitaro's Voice Material Studio  https://amitaro.net/
