Receiver-Off-Hook Tone Detect
RECEIVER OFF-HOOK (ROH) TONE CONSISTS OF FOUR SIMULTANEOUS FREQUENCIES
ROH Tone Detect is used to detect the status of the call.
- 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)
Platforms Arm Devices Armv7-A Cortex-A8 / A9 / A15
ADT ROH TD is available on the above Platforms: Other configurations are available upon request.
ROH TD ARM Cortex-A8 / A9 / A15CPU UTILIZATION & MEMORY REQUIREMENTS
All Memory usage is given in units of byte
|Function||MIPS per Channel||Program Memory||Data Memory||Per-Channel Data Memory|
Note: All CPU usage given in MIPS (also known as MCPS or MHz)
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.
API function call summary