region:us
---
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train-*
dataset_info:
  features:
  - name: audio
    dtype: audio
  - name: duration
    dtype: float64
  - name: text
    dtype: string
  splits:
  - name: train
    num_bytes: 1233182773.768
    num_examples: 5363
  download_size: 1098148678
  dataset_size: 1233182773.768
---

# NST Text-to-Speech Dataset for Norwegian Bokmål

## Table of Contents
- [Table of Contents](#table-of-contents)
- [Dataset Description](#dataset-description)
  - [Dataset Summary](#dataset-summary)
  - [Language](#languages)
- [Dataset Structure](#dataset-structure)
  - [Data Instances](#data-instances)
  - [Data Fields](#data-fields)
  - [Data Splits](#data-splits)
- [Dataset Creation](#dataset-creation)
  - [Curation Rationale](#curation-rationale)
  - [Source Data](#source-data)
  - [Personal and Sensitive Information](#personal-and-sensitive-information)
- [Considerations for Using the Data](#considerations-for-using-the-data)
  - [Social Impact of Dataset](#social-impact-of-dataset)
  - [Discussion of Biases](#discussion-of-biases)
- [Additional Information](#additional-information)
  - [Licensing Information](#licensing-information)

## Dataset Description

- **Repository:** https://www.nb.no/sprakbanken/en/resource-catalogue/oai-nb-no-sbr-87/
- **Point of Contact:** sprakbanken@nb.no

### Dataset Summary

The Norwegian TTS dataset from the now defunct firm Nordisk språkteknologi (NST) was created at the start of the millenium.
It has been distributed by Språkbanken at the National Library of Norway since 2011. The dataset contains 7+ hours of recordings
of one man reading from a manuscript. The manuscript contains sentences, phrases and words.

### Language

Norwegian Bokmål

## Dataset Structure

### Data Instances

```
{'audio': {'path': 'ctts_core_cs_01_0011_1.wav',
  'array': array([ 6.27044678e-01,  0.00000000e+00,  0.00000000e+00, ...,
         -1.22070312e-04, -1.83105469e-04, -2.74658203e-04]),
  'sampling_rate': 22050},
 'duration': 5.48,
 'text': 'jeg syntes det hørtes stort ut.'}
```

### Data Fields

* **audio**:
  * **path**: File name of the segment
  * **array**: Array of audio data of the segment
  * **sampling_rate**: The sampling rate of the segment (22050 Hz)
* **duration**: The duration of the segment in seconds
* **text**: The text of the segment

### Data Splits

The dataset only has a training split.

## Dataset Creation

### Curation Rationale

The dataset was created by Nordisk språkteknologi to be used in various TTS tools at the turn of the millenium.
It has since been given an open licence and distributed freely in Språkbanken.

### Source Data

#### Initial Data Collection and Normalization

The recordings and the manuscript are developed by NST. We don't have information about the data collection process.
The text strings contain puncuation, but not sentence-initial capitalization. The manuscript is likely created to 
get a broad coverage of Norwegian phoneme clusters. There seems to be utterances in the manuscript relevant for various
applications, e.g. screen navigation and numbers.

#### Who are the source language producers?

The Employees at NST

### Personal and Sensitive Information

The speaker of the dataset is anonymous and the manuscript does not contain sensitive information.

## Considerations for Using the Data

### Social Impact of Dataset

This dataset can be used to develop and improve TTS for Norwegian Bokmål. To our knowledge, it is the
only freely available dataset intended for this use in Norwegian Bokmål.

### Discussion of Biases

The dataset contains audio from one male speaking the Oslo dialect, so the dataset lacks gender and
dialect variation. The manuscript is Bokmål only, so it cannot be used to create application in 
Norwegian Nynorsk, the other official written standard of Norwegian.


## Additional Information

### Licensing Information

(CC0)[https://creativecommons.org/publicdomain/zero/1.0/]
