ROH | Receiver-Off-Hook Tone Detect

ROH Tone Detect is used to detect the status of the call.

Detects the call progress tone that is used when a phone is off hook for a prolonged period without any activity.

Receiver off hook

Features List

  • Counts ROH tone on/off cycles to provide an additional degree of robustness/confidence in detector results
  • Detects and verifies both frequency content and cadence (on/off period)
  • Functions are C-callable

  • Designed for multiple channel operation

THE RECEIVER OFF-HOOK TONE CONSISTS OF FOUR SIMULTANEOUS FREQUENCIES (1450, 2060, 2450, AND 2600 HZ)

Availability

Platforms
Arm Devices Armv7-A Cortex-A8 / A9 / A15

ADT ROH TD is available on the above Platforms: Other configurations are available upon request.

Specifications

Description

Adaptive Digital’s Receiver Off Hook (ROH) detector software is designed to detect the call progress tone that is used when a phone is off hook for a prolonged period without any dialing activity or after disconnect. The ROH tone consists of four simultaneous frequencies (1450, 2060, 2450, and 2600 Hz) applied at a high signal level in order for a person who is not near the phone to hear the condition so he/she will hang the phone up.

Function API's​

API function call summary

ROHDET_ADT_init
ROHDET_ADT_detect
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