CAS tone disguising method and apparatus

• US 6,101,252 A
• Filed: 03/31/1997
• Issued: 08/08/2000
• Est. Priority Date: 03/31/1997
• Status: Expired due to Fees

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Nortel Networks Corporation
• Inventors: Cardillo, Raymond Anthony IV, Knight, Stephen D.
• Primary Examiner(s): Isen, Forester W.
• Assistant Examiner(s): SAINT SURIN, JACQUES M
• Application Number:
  US08/829,082
• Time in Patent Office: 1,226 Days
• Field of Search: 379/361, 379/283, 379/353, 379/386, 379/93.09, 379/93.11, 379/93.17, 379/93.15, 379/93.16, 379/93.28, 379/252, 379/142, 379/211, 379/253, 379/254, 379/255 , 379/256
• US Class Current: 379/361
• CPC Class Codes: H04M 1/2471 Configurable and interactive telephone terminals with subscriber controlled features modifications, e.g. with ADSI capability [Analog Display Services Interface] systems providing special services or facilities to subscribers H04M3/42; administration or customization of services H04M3/42136; by downloading data to substation equipment H04M3/42178
• CPC Class Codes: H04M 1/82 Line monitoring circuits for call progress or status discrimination for detecting caller identity H04M1/573
• CPC Class Codes: H04M 2201/38 Displays
• CPC Class Codes: H04M 3/42153 by subscriber
• CPC Class Codes: H04M 7/0012 Details of application programming interfaces [API] for telephone networks; Arrangements which combine a telephonic communication equipment and a computer, i.e. computer telephony integration [CPI] arrangements

Abstract

The ADSI system 100 has a file stored in RAM 202 or ROM 204. The file plays a CAS tone. The CAS tone is disguised by playing one or more introductory tones as frequencies lower than the CAS tone. The user is conditioned to receive a CAS tone by ramping the CAS tone amplitude or increasing the amplitude in discrete steps.

Claims

1. A method for operating a computer telephony platform comprising the steps of:

receiving a call from a telephone that is switchable between a first mode for receiving analog information and a second mode for receiving digital information;

generating a CAS tone to switch the telephone to the second mode for receiving for receiving digital information;

responding to the CAS tone with a DTMFA signal;

the step of generating a CAS tone including generating a sequence of two or more tones of different frequencies followed by a CAS tone for switching from voice to data or from data to voice.

2. The method of claim 1 wherein the sequence of tones is pleasing to the human ear.

3. The method of claim 1 wherein the sequence of two or more tones followed by a CAS tone are at frequencies lower than the CAS tone.

4. The method of claim 1 wherein the frequency of each tone in the sequence prior to the CAS tone is greater than the prior tone in said sequence.

5. The method of claim 1 wherein the frequency of each tone in the sequence before the CAS tone differs from a prior or subsequent tone of the sequence by a whole step.

6. The method of claim 1 wherein the sequence of tones is played within a set time frame.

7. The method of claim 1 wherein the sequence of tones includes single frequency tones.

8. The method of claim 1 wherein the sequence of tones comprises multifrequency tones.

9. The method of claim 1 wherein the CAS tone is embedded in another sound.

10. The method of claim 9 wherein the CAS tone is added to one or more single or multifrequency tones.

11. The method of claim 9 wherein the telephone responds to a CAS tone at or above a threshold amplitude and the CAS tone is not masked by the amplitude of other tones.

12. The method of claim 9 wherein the CAS tone exceeds the threshold amplitude.

13. A method for operating a computer telephony platform comprising the steps of:

receiving a call from a telephone that is switchable between a first mode for receiving analog information and a second mode for receiving digital information;

generating two or more tones in sequence suitable for warning an end user that a CAS tone is coming, and then generating a CAS tone to switch the telephone to the second mode for receiving digital information;

responding to the CAS tone with a DTMFA signal;

prior to or simultaneously with the step of generating the CAS tone, mixing the CAS tone with one or more other tones to render the CAS tone more pleasing to the human ear.

14. The method of claim 13 wherein the step of generating the CAS tone includes generating one or more sequential tones of one or more amplitudes prior to the generation of the CAS tone to condition the human ear to receive the CAS tone.

15. A method for operating a computer telephony platform comprising the steps of:

receiving a call from a telephone that is switchable between a first mode for receiving analog information and a second mode for receiving digital information;

generating a CAS tone to switch the telephone to the second mode for receiving digital information;

responding to the CAS tone with a DTMFA signal;

sound conditioning a user of the telephone and/or disguising the CAS tone.

16. The method of claim 15 wherein the step of disguising the CAS tone comprises the step of increasing the amplitude of the CAS tone until it is recognized by the telephone.

17. The method of claim 16 wherein the step of increasing the CAS tone comprises increasing the amplitude at a fixed rate of change.

18. The method of claim 16 wherein the step of increasing the CAS tone comprises increasing the amplitude at a variable rate of change.

19. The method of claim 16 wherein the step of increasing the CAS tone comprises increasing the amplitude to one or more fixed step increases.

20. The method of claim 16 wherein the step of increasing the CAS tone comprises sequentially increasing the amplitude at a first rate of change to a first level and repeating the steps of increasing the amplitude at said first rate to one or more subsequent levels until the telephone recognizes the CAS tone.

49. The method of claim 16 wherein the means for increasing, the CAS tone comprises means for sequentially increasing the amplitude at a first rate of change to a first level and means for repeating the step of increasing the amplitude at said first rate to one or more subsequent levels until the telephone recognizes the CAS tone.

21. A method for operating a computer telephony platform comprising the steps of:

receiving a call from a telephone that is switchable between a first mode for receiving analog information and a second mode for receiving digital information;

generating a CAS tone to switch the telephone to the second mode for receiving digital information;

responding to the CAS tone with a DTMFA signal;

ramping the amplitude of the CAS tone until it is recognized.

22. The method of claim 21 wherein there is a sequence of tones and ramping the amplitude of one or more tones in the sequence, including the CAS tone, until the telephone recognizes the CAS tone.

23. The method of claim 22 wherein all tones are ramped.

24. The method of claim 21 wherein the CAS tone is increased in amplitude by two or more amplitude steps.

25. The method of claim 22 wherein the step of increasing the CAS tone comprises sequentially increasing the amplitude at a first rate of change to a first level and repeating the steps of increasing the amplitude at said first rate to one or more subsequent levels until the telephone recognizes the CAS tone.

26. The method of claim 21 wherein the CAS tone is increased slow enough to not hurt the user.

27. A method for operating a computer telephony platform comprising the steps of:

receiving a calling signal from a telephone at a first location, said telephone switchable between a first mode for receiving analog information and a second mode for receiving digital information;

generating a CAS tone to switch the telephone to the second mode for receiving digital information;

responding to the CAS tone with a DTMFA signal;

recognizing the location of the calling signal and generating a CAS tone at an amplitude in accordance with the location of the telephone.

28. The method of claim 27 comprising the further step of remembering the history of calls from said telephone at said first location and generating a CAS tone in accordance with the amplitudes of prior CAS tones sent to said telephone.

29. The method of claim 28 comprising the step of increasing the amplitude of the CAS tone by a fixed rate by discrete steps or by a combination of a fixed rate and discrete steps.

30. A computer telephony platform comprising:

means for receiving a call from a telephone that is switchable between a first mode for receiving analog information and a second mode for receiving digital information;

means for conditioning a user of the telephone and/or disguising the CAS tone;

means for generating a CAS tone to switch the telephone to the second mode for receiving digital information.

31. The computer telephony platform of claim 30 wherein the means for conditioning a user of the telephone comprises means for generating a sequence of single or multifrequency tones with the CAS tone included in the last tone(s) of the sequence.

32. The computer telephony platform of claim 30 wherein the sequence includes three tones.

33. The computer telephony platform of claim 30 wherein the CAS tone is the last tone in the sequence.

34. The computer telephony platform of claim 30 wherein the sequence of tones is pleasing to the human ear.

35. The computer telephony platform of claim 30 wherein tones other than the CAS are at frequencies lower than the CAS tone.

36. The computer telephony platform of claim 30 wherein the frequency of each tone is greater than the prior tone in said sequence.

37. The computer telephony platform of claim 30 wherein the frequency of each tone in the sequence differs from a prior or a subsequent tone by a whole step.

38. The computer telephony platform of claim 30 wherein sequence of tones is played within a set time frame.

39. The computer telephony platform of claim 30 wherein the sequence of tones includes single frequency tones.

40. The computer telephony platform of claim 30 wherein the sequence of tones comprises multifrequency tones.

41. The computer telephony platform of claim 30 wherein the CAS tone is embedded in another sound.

42. The computer telephony platform of claim 30 wherein the CAS tone is added to one or more single or multifrequency tones.

43. The computer telephony platform of claim 30 wherein the telephone responds to a CAS tone at or above a threshold amplitude and the CAS tone is not masked by the amplitude of other tones.

44. The computer telephony platform of claim 30 wherein the CAS tone exceeds the threshold amplitude.

45. The computer telephony platform of claim 30 wherein the means for disguising the CAS tone comprises means for increasing the amplitude of the CAS tone until it is recognized by the telephone.

46. The computer telephony platform of claim 30 wherein the means for increasing the CAS tone comprises means for increasing the amplitude at a fixed rate of change.

47. The computer telephony platform of claim 30 wherein the means for increasing the CAS tone comprises means for increasing the amplitude at a variable rate of change.

48. The computer telephony platform of claim 30 wherein the means for increasing the CAS tone comprises means for increasing the amplitude to one or more fixed step increases.