Absorption rate detection

A method for proximity detection on an electronic device, the method comprising the steps of:

• performing a first measurement using a first ultrasound sensor by:
• transmitting an ultrasound signal from an ultrasound transmitter;
• and
• generating a measured signal by receiving, at an ultrasound receiver, an echo of the ultrasound signal reflected by an object;
• calculating, using a processing unit, a first distance value from the first measurement;
• the first distance value being indicative of a distance between a user and the electronic device;
• in response to the first distance value, through the processing unit, adapting an energy level on the electronic device, the energy level being related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• calculating, using the processing unit, a first quality factor related to the first measurement;
• dependent upon the first quality factor and the distance value, deciding if the processing unit adapts an energy level on the electronic device in relationship to the first distance value;
• wherein the energy level is related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• and
• wherein characteristics are chosen so as to identify softness of a material, so as to be able to distinguish between skin and hard materials.

A method for proximity detection on an electronic device, the method comprising the steps of:

• performing a first measurement using a first ultrasound sensor by:
• transmitting an ultrasound signal from an ultrasound transmitter;
• and
• generating a measured signal by receiving, at an ultrasound receiver, an echo of the ultrasound signal reflected by an object;
• calculating, using a processing unit, a first distance value from the first measurement;
• the first distance value being indicative of a distance between a user and the electronic device;
• in response to the first distance value, through the processing unit, adapting an energy level on the electronic device, the energy level being related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• calculating, using the processing unit, a first quality factor related to the first measurement;
• and
• dependent upon the first quality factor and the distance value, deciding if the processing unit adapts an energy level on the electronic device in relationship to the first distance value;
• wherein the energy level is related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• adapting the energy level through the processing unit if the first quality factor meets a first criterion;
• and
• wherein the first criterion comprises a probability value indicative of that the first distance value is accurate above a predetermined limit.

A method for proximity detection on an electronic device, the method comprising the steps of:

• performing a first measurement using a first ultrasound sensor by:
• transmitting an ultrasound signal from an ultrasound transmitter;
• and
• generating a measured signal by receiving, at an ultrasound receiver, an echo of the ultrasound signal reflected by an object;
• calculating, using a processing unit, a first distance value from the first measurement;
• the first distance value being indicative of a distance between a user and the electronic device;
• in response to the first distance value, through the processing unit, adapting an energy level on the electronic device, the energy level being related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• calculating, using the processing unit, a first quality factor related to the first measurement;
• dependent upon the first quality factor and the distance value, deciding if the processing unit adapts an energy level on the electronic device in relationship to the first distance value;
• wherein the energy level is related to the Specific Absorption Rate (“SAR”), such that predefined SAR requirements due to exposure of emitted energy from the electronic device are met;
• unaffecting the energy level through the processing unit if the first quality factor does not meet a first criterion;
• performing a second measurement using a second sensor;
• calculating, using the processing unit, a second distance value from the second measurement;
• the second distance value being indicative of the distance between the user and the electronic device;
• calculating, using the processing unit, a second quality factor related to the second measurement;
• and
• dependent upon the second quality factor, deciding if the processing unit adapts the energy level;
• adapting the energy level through the processing unit if the second quality factor meets a second criterion;
• and
• wherein at least one of the overall criterion, and the second criterion comprise an individual probability value indicative of that the respective the another first distance value and/or the second distance value is/are accurate above their respective predetermined limit.