Method and apparatus for reducing false ringback detection
AssigneeMotorola, Inc.
InventorsNader Rizq, Martin T. Karanja, Chin Pan Wong
Life of this patent
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Abstract
In a communication device, a decoded audio signal is evaluated by a detection function (112). Two portions of the decoded audio signal spectrum are evaluated, a ringback band (206), and the remaining band(s). The signal strength in the ringback band is measured against a preselected ringback energy threshold level and the non-ringback signal strength is measured against a voice energy threshold level. Only if the ringback energy is above the ringback energy threshold level and the non-ringback band energy is below the voice energy threshold level will a ringback filter be applied to the audio signal.
Claims17
A method for reducing false ringback detection in a communication device, comprising:
- receiving an encoded audio signal;
- decoding the encoded audio signal to provided a decoded audio signal;
- determining a ringback energy level in a ringback band of the decoded audio signal;
- determining a non-ringback energy level in the decoded audio signal out of the ringback band of the decoded audio signal;
- applying a ringback filter to the decoded audio signal only when the energy in the ringback band is above a preselected ringback energy threshold level and the energy out of the ringback band is below a preselected voice energy threshold level.
A method for reducing false ringback detection in a received encoded audio signal, the method comprising the steps of:
- decoding the encoded audio signal to provide a decoded audio signal having an energy level;
- comparing the energy level of the decoded audio signal in a ringback band with a preselected ringback energy threshold level;
- comparing the energy level of the decoded audio signal out of the ringback band with a preselected non-ringback energy threshold level;
- applying a ringback filter to the decoded audio signal only if the energy level of the decoded audio signal in the ringback band is above the preselected ringback energy threshold level and the energy level of the decoded audio signal out of the ringback band is below the preselected non-ringback energy threshold level, the step of applying a ringback filter providing a ringback signal;
- and
- playing the ringback signal over an audio transducer.
A communication device for providing telephone service and reducing false ringback detection, comprising:
- a receiver for receiving an encoded audio signal;
- a decoder for decoding the encoded audio signal to provide a decoded audio signal;
- detection means for detecting a ringback energy in a ringback band of the decoded audio signal and a non-ringback energy out of the ringback band;
- and
- a ringback filter for passing the ringback band of the decoded audio signal only when the ringback energy is above a preselected ringback energy threshold level and the non-ringback energy is below a preselected non-ringback energy level threshold.
Dependencies are inferred from the claim text.