Speech Channel Monitoring¶

Speech channel monitoring evaluates the quality and content of the speech channel established between two phones that are under intaQt's control. When speech channel monitoring is requested, the caller plays a given reference audio file using the intaQt Audio Service. At the same time, the callee records the call that is established between the phones. In parallel, the speech channel's reverse direction is covered by playing the reference audio file on the callee and recording it on the caller. The recordings on A and B are attached to the test report for evaluation.

The recording analysis evaluates three characteristics about the sounds emitted, their frequency and their duration. Analysis parameters can be adjusted in the Audio Monitoring configuration.

Total number of beeps: If the total number of beeps does not exceed a given limit, the monitoring is considered failed.
Predominant frequency: The recording's predominant frequency must match the beeps' nominal frequency. If the call channel is broken, a white noise recording would fail the frequency check.
Pause position and duration: If a pause is too long, one or more beeps are missing from the recording.

Important! Having multiple recordings or playbacks at the same time on a given Raspberry Pi is not possible. However, running a single recording and a single playback simultaneously is possible. Trying to run multiple recordings simultaneously leads to an error that resets the Audio Service.

Speech Channel Monitoring
Start Speech Channel Monitoring
Stop Speech Channel Monitoring
Evaluate Speech Channel Monitoring

Start Speech Channel Monitoring ¶

This step:

Starts audio recording on two specified phones
Starts the playback of a predetermined audio file on both phones
Specifies a name for the speech channel monitoring (optional)

Syntax

// Does not specify a name for the speech channel monitoring
start speech channel monitoring for <phone Identifier> and <phone Identifier>

// Specifies a name for the speech channel monitoring
start speech channel monitoring for <phone Identifier> and <phone Identifier> as <name Identifier>

Parameters

phone - The identifiers of the phones participating in the monitored call
name (Optional) - The name assigned to the Speech Channel Monitoring initiated for the two participating phones
- When not specified, the name SCM_<phone1>_<phone2> will be used to uniquely identify the Speech Channel Monitoring

Example

// No name specified
And start speech channel monitoring for A and B
Resulting speech channel monitoring name : SCM_A_B

// With specified name
And start speech channel monitoring for A and B as monitoring_phones

Stop Speech Channel Monitoring ¶

This step:

Stops audio recording by either specifying the participating phones or the speech channel monitoring name
Stops the audio playback on both phones

Syntax

// Specifies the phones
stop speech channel monitoring for <phone Identifier> and <phone Identifier>
// Specifies the speech channel monitoring name
stop speech channel monitoring <name Identifier>

Parameters

phone - The identifiers of the phones participating in the monitored call
name - The explicit name identifying a Speech Channel Monitoring, as given in the start speech channel monitoring step
- Stopping an unnamed speech channel monitoring can also be done by using its implicit name, for example, its default name SCM_<phone1>_<phone2>

Named Speech Channel Monitoring Example

1
2
3

// With a named speech channel monitoring
And start speech channel monitoring for A and B as monitoring_phones
And stop speech channel monitoring monitoring_phones

Phone Identifiers Example

1
2
3

// With an unnamed speech channel monitoring
And start speech channel monitoring for A and B
And stop speech channel monitoring for A and B

Implicitly-Named Speech Channel Monitoring Example

1
2
3

// With a named speech channel monitoring
And start speech channel monitoring for A and B
And stop speech channel monitoring SCM_A_B

In the example above, the speech channel monitoring was assigned the default name SCM, meaning it is can be referenced in the stop speech channel step as SCM_A_B.

Evaluate Speech Channel Monitoring ¶

This step:

Retrieves the recordings using the speech channel monitoring name, either the implicit (SCM_<phone1>_<phone2>) or the explicitly-assigned name.
Evaluates the speech channel based on the retrieved recordings.

Note: The start and stop speech channel monitoring steps MUST have preceded the evaluate step.

Syntax

// Specifies the phones
evaluate speech channel monitoring for <phone Identifier> and <phone Identifier>

// Specifies the speech channel monitoring name
evaluate speech channel monitoring <name Identifier>

Parameters

phone - The identifiers of the phones participating in the monitored call
name - The explicit speech channel monitoring name

Named Speech Channel Monitoring Example

1
2
3

And start speech channel monitoring for A and B as monitoring_phones
And stop speech channel monitoring monitoring_phones
And evaluate speech channel monitoring monitoring_phones

Phone Identifiers Example

1
2
3

And start speech channel monitoring for A and B
And stop speech channel monitoring for A and B
And evaluate speech channel monitoring for A and B

Implicitly-Named Speech Channel Monitoring Example

1
2
3

And start speech channel monitoring for A and B
And stop speech channel monitoring for A and B
And evaluate speech channel monitoring SCM_A_B