Kate R

Phonetic Indexing – A Better Approach than Speech Recognition?

Benefits Of Phonetic Indexing For Business Owners

Contrary to the basic method of speech recognition and keyword targeting – in which the software program is designed to transcribe entire sentences as an array of words – phonetic indexing is an easy way to monitor the occurrence of certain keywords.

For obvious reasons, the technique is easy to manage and implement. Entrepreneurs can make use of audio indexing according to their needs. A speech indexing algorithm is designed on simple computation techniques for calculating the number of times a particular word is used. However, the list of keywords can be different for different organizations.

How Phonetic Indexing Works?

Unlike a solution that uses speech recognition, phonetic indexing technology does not perform keyword spotting. Rather, a phonetics-based speech analytics solution, like CallFinder, scans your recordings and uses the original audio files to identify the string of phonemes (the smallest units of sound that make up language) matching the custom search criteria.

Phonetic indexing operates in two phases:

Phase I- Track Indexing

In this phase, the original speech of the caller is modified to match the accent, pitch, and pronunciation of the track which is stored in the indexing database. This is a built-in feature, and requires no additional hardware. The phase of indexing also includes noise filtration, unwanted signals suppression, improvement of signal-to-noise ratio and frequency matching. The indexed track contains the original words of the caller but sounds completely different.

Phase II- Keywords Spotting

The indexed tracked is then scanned to compute the occurrences of identified keywords. This allows users to identify most frequently encountered issues, and also search for specific product mentions, competitor mentions, and much more. There is a look up table stored in the database of indexing algorithm. The words in this table are stored according to the needs of the user. The software program is designed to compare the indexed speech with the words present in the look up table. The end result of the scanning tells the number of times a word is found in the audio recording, and the audio player used in the CallFinder dashboard, for example, displays exactly where within the call each particular keyword or phrase occurs.


There are a number of areas in which phonetic indexing outperforms speech recognition technology:

  • The algorithm of phone indexing is only designed to perform mathematical computations, response time of indexing is faster than other multitasking techniques.
  • Phonetic indexing is stable. With speech recognizer module, you need to upgrade the hardware as well as software with the growth of the company. But indexing phonemes only requires modifying the keywords list with the changing business needs.
  • The technique is extremely flexible and can be used by every organization.
  • It is the ease of use. There is no need of technical assistance for implementing this software program.
  • Updates to the searchable vocabulary according to the most frequently used words and phrases by consumers can be made at any time, and searches can then run on historical recordings, as well as new inbound call recordings.

Phonetic indexing of call recordings is available with a cloud-based speech analytics technology from CallFinder. Contact us to schedule a tour of this affordable, flexible, l0w-maintenance solution today.