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Automatic Speech Recognition (ASR)


Sizing LumenVox Deployments

When building speech applications we’re often asked, “How many ports or channels can I run on a given machine?” 

In general, the number of simultaneous speech sessions that can be reliably run varies with the capacity of the machine and the type of speech recognition being performed. For instance, recognizing a single digit is computationally less “expensive” than recognizing a full street address from a complex grammar.


Grammar Complexity

is often not simply the number of words present within a grammar, but also how the grammar rules themselves are structured. Rules that have variable phrases, or recursion for example are more computationally complex than rules containing simply one or two words.

Main Contributors to the Amount of CPU and Memory Resources Needed by a Speech Application

can be summarized by factoring in things like the complexity of grammars used, the number of concurrent calls, the ratio of speech recognition to prompt playback or DTMF processing within an application, the average call duration and also the average number of ASR operations within a call.

All of these factors affect the overall sizing calculation, so it is virtually impossible to be completely certain of a maximum number of channels a given system can run without actually performing some tests using the actual application and measuring system memory and CPU use under load.

LumenVox Sizing Tools

Guidance and sizing estimates for a reasonable idea of the type of performance from certain machine specifications are free and available upon request. However, we always recommend performing some testing against the production application in order to get actual performance metrics.

Distributed and High-Availability Architecture

It is also important to remember that the LumenVox product architecture is designed to be distributed, allowing several LumenVox servers to be configured into clusters, allowing modular scalability and redundancy within designs if needed.

Continuous Development

Also, LumenVox is continuously developing new methods to allow this scaling to be done more efficiently, so please be sure to review the latest versions of LumenVox products when sizing a new application.

Learn More

Please contact LumenVox for more information if you require specialized assistance in configuring large or unusual server configurations, including high performance or high-availability clusters, we’d be happy to help.

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