US 2002/0159608 A1 · Audio device characterization for accurate predictable volume control

Abstract

An automatic gain control method in accordance with the inventive arrangements can include the following steps. Initially, an audio signal can be provided to an audio device which has a range of permissible signal level settings and a signal level controller for establishing a particular signal level setting. In addition, an actual signal level can be measured for the audio signal at an established signal level setting. The measured actual signal level further can be stored in a volume map along with the corresponding established signal level setting. Following the storage of the measured actual signal level in the volume map, a different signal level setting can be established using the signal level controller. Subsequently, the actual signal level can be re-measured and the re-measured actual signal level and corresponding established different signal level setting can be stored in the volume map. Finally, the volume map can be used during an audio processing session to determine a signal level setting for the audio device, wherein the signal level setting corresponds to a desired actual audio signal level. In one aspect of the present invention, the method can also include detecting a hysteresis condition in the volume map.

Claims25

Dependent claims

An automatic gain control method comprising:

providing an audio signal to an audio device having a range of permissible signal level settings and a signal level controller for establishing a particular signal level setting;
measuring an actual signal level for said audio signal at an established signal level setting and storing said measured actual signal level and corresponding established signal level setting in a volume map;
establishing a different signal level setting using said signal level controller, re-measuring said actual signal level and storing said re-measured actual signal level and corresponding established different signal level setting in said volume map;
and,
using said volume map during an audio processing session to determine a signal level setting for said audio device, said signal level setting corresponding to a desired actual audio signal level.

2 more elements

An audio device characterization method comprising:

providing an audio signal to an audio device having a range of permissible signal level settings and a signal level controller for establishing a particular signal level setting;
measuring an actual signal level for said audio signal at an established signal level setting and storing said measured actual signal level and corresponding established signal level setting in a table;
establishing a different signal level setting using said signal level controller, re-measuring said actual signal level and storing said re-measured actual signal level and corresponding established different signal level setting in said table;
and,
repeating said step of establishing a different input signal level setting using said input signal level controller, re-measuring said actual signal level and storing said re-measured actual signal level and corresponding input signal level setting in said table for each permissible input signal level setting.

2 more elements

A machine readable storage, having stored thereon a computer program for characterizing an audio device, said computer program having a plurality of code sections executable by a machine for causing the machine to perform the steps of:

providing an audio signal to an audio device having a range of permissible signal level settings and a signal level controller for establishing a particular signal level setting;
measuring an actual signal level for said audio signal at an established signal level setting and storing said measured actual signal level and corresponding established signal level setting in a table;
establishing a different signal level setting using said signal level controller, re-measuring said actual signal level and storing said re-measured actual signal level and corresponding established different signal level setting in said table;
and,
repeating said step of establishing a different input signal level setting using said input signal level controller, re-measuring said actual signal level and storing said re-measured actual signal level and corresponding input signal level setting in said table for each permissible input signal level setting.

2 more elements

Dependencies are inferred from the claim text.

Audio device characterization for accurate predictable volume control

Life of this patent

Audio device characterization for accurate predictable volume control

Life of this patent

Abstract

Claims25