Adaptive ringtone detector

1. A communications system for use with a hook switching device capable of hook switching the telephone on and off hook when a call is accepted or terminated comprising:

a communications device in communication with a telephone device,

a sensor located on the telephone device for sensing a ringing signal, and

a ringtone detector connected to the sensor and the communications device, wherein the ringtone detector comprises a feature extractor associated with the ringtone detector, which detects and learns distinctive ringtones,

a ringtone feature memory capable of storing characteristics of ringtones for later retrieval and comparison;

a comparator for comparing previously stored ringtone characteristics to incoming ringtone characteristics;

an alert generator, responsive to said comparator when the comparator identifies a match with a previously learned ringtone characteristics and then generates an alert signal in response thereto.

2. A communications system according to claim 1 , wherein the hook switching device comprises a hook switching device with mechanical lifter for lifting and lowering a handset on the telephone device.

3. A communications system according to claim 1 , wherein the hook switching device comprises an electronic hook switching unit transmitting a hook switching signal to the telephone device.

4. A communications system according to claim 1 , wherein the ringtone detector comprises one or more filter/amplifier stages and a microprocessor controlling the filter/amplifier stages.

5. A communications system according to claim 4 , wherein the filter/amplifier stages comprise two or more parallel pipelines containing at least a bandpass filter and a detector.

6. A communications system according to claim 4 , wherein the filter/amplifier stages comprise at least two bandpass filters, a detector connected to each bandpass filter, and at least two daisy-chain connections between different bandpass filters.

7. A communications system according to claim 4 , wherein the microprocessor adaptively sets the parameters for the filter/amplifier stages according to the sensor position and pick-up sensitivity.

8. A communications system according to claim 1 , wherein the sensor is a vibration sensor, a piezoelectric sensor, or an audio pick-up sensor.

9. A Communications system according claim 1 , wherein the ringtone detector comprises a transmitter connected to the hook switch for transmitting a hook switching signal to the telephone device.

10. A communications system for use with a telephonic communications device, comprising:

a sensor located proximate the telephonic device capable of sensing its ring signal, and

a ringtone detector connected to the sensor, including a feature extractor which detects and learns distinctive ringtones automatically,

a ringtone memory capable of storing characteristics of extracted ringtones for later retrieval and comparison;

comparator for comparing previously stored ringtone characteristics to incoming ringtone characteristics

alert generator, responsive to said comparator to send an alert signal to the user when the comparator identifies a match with a previously learned ringtone.

11. A method of adaptively detecting and learning distinctive ringtones comprising:

detecting a ringing signal from a sensor located on a telephone device,

filtering the detected ringing signal to create a processed signal,

determining one or more characteristics of a ringtone, and

transmitting an alert signal to a communications device once a ringtone has been determined,

wherein when a ringtone is determined to be new, one or more characteristics of that distinctive ringtone is/are learned and stored in a memory.

12. A method of adaptively detecting and learning distinctive ringtones according to claim 11 , wherein the characteristics of a new ringtone are automatically detected, learned and stored in the memory.

13. A method of adaptively detecting and learning distinctive ringtones according to claim 11 , wherein the characteristics comprise at least ringing volume, type of ringtone, or tunes.

14. A method of adaptively detecting and learning distinctive ringtones according to claim 11 , wherein the method further comprises a controlling the settings of filter parameters and amplifier parameters.

15. A method of adaptively detecting and learning distinctive ringtones according to claim 14 , controlling the filter parameters according to the sensor position and pick-up sensitivity.

16. A method of adaptively detecting and learning distinctive ringtones according to claim 1 , including locating the sensor in the proximity of a loudspeaker in a position distant from the point at which the detected signal would be maximal.

17. The method of adaptively detecting and learning distinctive ringtones according to claim 11 , wherein the characteristics of a new ringtone are automatically detected, learned stored in the memory and when a particular learned ringtone is detected on a subsequent ring, a predetermined alert signal is generated.

18. The method of adaptively detecting and learning distinctive ringtones according to claim 17 , a predetermined alert signal is generated for at least some of said learned ringtones, and wherein a different alert signal is generated for at least some of said learned ringtones.

19. The method of adaptively detecting and learning distinctive ringtones according to claim 11 , wherein the characteristics comprise at least ringing volume, type of ringtone, or tunes.