Substitutions

Substitution rules contain lists of “target:replacement” mappings, which enable you to correct consistent and frequent transcription errors that result from out-of-vocabulary words, excess noise in the audio, poor enunciation, or strong accents. They can also be used to correct word combinations that rarely occur in general speech but occur frequently within a specific domain or company.

For example, useful substitutions in the insurance domain could include “giant whale : giant hail” and “hit a beer : hit a deer”.

Table 1. Substitutions Parameters
Name	Availability	Values	Description
subst	V‑Blaze 7.1+ V‑Cloud 1.6+	true, false (default), none	The `subst` parameter can be used to enable or disable automatic system- and model-level substitutions. `subst=true` Enables system- and model-level substitutions `subst=false` Disables system-level substitutions; model-level substitutions still apply `subst=none` Disables both system- and model-level substitutions Note: `subst` does not affect substitutions requested with the `subst_list` or `subst_rules` parameters. This parameter is intended for debugging purposes only and should not be used in production.
substinfo	V‑Blaze 7.1+ V‑Cloud 1.6+	true, false (default)	Provides substitution details in JSON transcripts. Set `substinfo` to true to include a top-level JSON object that indicates the applied substitution rules and a number count for each rule. In addition to the top-level JSON object, `substinfo` includes another JSON object in the metadata that details each substitution's location, the substitution rule applied, and the substitution rule source. This parameter is intended for debugging purposes only and should not be used in production. Tip: The information provided by the `substinfo` parameter is especially helpful for developing and debugging substitution configurations.
subst_rules	V‑Cloud, V‑Blaze v5.6+, V‑Spark	string/filename	Specifies a newline-delimited string that contains substitution rules to be applied during transcription. Rules can be specified directly as a string, however, the recommended approach is to auto-populate the string with the contents of a substitutions file. This approach makes it easier to edit and maintain these rules over time. If you are using cURL, you can specify a file for the `subst_rules` parameter as shown in the following example. `subst_rules=</path/to/file.sub` Note: Refer to Best practices for more detailed examples of substitution rules.