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. 

Platforms

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.

Features

  • 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

Description

Receiver Off Hook (ROH) Tone Detector

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.

 This tone consists of 4 sine wave frequencies that are both on and off for 0.1s.

Specification Tables

NOTE: We specify MIPS (Millions of Instructions Per Second) as MCPS (Millions of Instruction Cycles Per Second). Unless otherwise specified, peak MIPS are indicated.
↓  Click on links below to view specification tables. 

ROH TD ARM Cortex-A8 / A9 / A15

CPU UTILIZATION & MEMORY REQUIREMENTS
All Memory usage is given in units of byte
FunctionMIPS per ChannelProgram MemoryData MemoryPer-Channel Data Memory
ROF Detect15.320642962636
FIR Filter3264

     «    mobile scroll  left and right   »

Note: All CPU usage given in MIPS (also known as MCPS or MHz)

API Functions

API function call summary

ROHDET_ADT_init
ROHDET_ADT_detect

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