---
title: "Calculate CPP and complementary voice measures from sustained vowel recording"
method: GET
path: "/api/calculate-cpp"
tags: ["Voice Quality Metrics"]
---

# Calculate CPP and complementary voice measures from sustained vowel recording

`GET /api/calculate-cpp`

## Request

- Base URL: `https://platform.vocametrix.com`
- URL: `https://platform.vocametrix.com/api/calculate-cpp`
- Auth: API key in header `X-API-Key`

## Query parameters

- `svFileId` string, required
- `version` string

## Response `200`

Successful response

- object
  - `CPP` number: Cepstral Peak Prominence value in dB. Example: 12.45
  - `VOICE_QUALITY` string: Binary classification against the 14.45 dB cut-off (Murton et al. 2020). Example: "Normal"
  - `SEVERITY` string: Text note on the classification. Example: "No dysphonia indicated"

## Other responses

- `400`: Bad request — missing or invalid parameter
- `401`: Unauthorized — missing or invalid API key
- `429`: Rate limit exceeded
- `500`: Server error

---

[API](https://skmtc.dev/vocametrix/apis/vocametrix-api.md) · [All operations](https://skmtc.dev/vocametrix/apis/vocametrix-api/llms.txt) · [OpenAPI document](https://skmtc.dev/vocametrix/apis/vocametrix-api/revisions/8a54d01bcc81?raw)