Method and Device for Switching Audio Recording Modes

An audio recording system, the system comprising:

• a sensitivity switch configured to amplify an analog audio recording signal according to one of a first analog gain and a second analog gain being higher than the first analog gain;
• an A/D converter configured to convert the analog audio recording signal amplified by the sensitivity switch to digital audio recording data;
• a first AGC configured to amplify the digital audio recording data according to a first digital gain and control the first digital gain to an appropriate level;
• a second AGC configured to amplify the digital audio recording data according to a second digital gain and control the second digital gain to an appropriate level;
• an automatic mode transition module configured to inform the sensitivity switch of using the second analog gain, start the second AGC and stop the first AGC when the first digital gain reaches a first gain threshold;
• inform the sensitivity switch of using the first analog gain, start the first AGC and stop the second AGC when the second digital gain reaches a second gain threshold;
• and
• wherein the first gain threshold is larger than the second gain threshold.

A device for switching audio recording modes, the device comprising:

• a gain detector configured to determine a current audio recording mode being one of a low sensitivity audio recording mode and a high sensitivity audio recording mode, obtain a digital gain for digital audio recoding dada in the current audio recoding mode;
• a first controller configured to switch to the high sensitivity audio recording mode when the digital gain reaches a first gain threshold and the current audio recording mode is the low sensitivity audio recording mode;
• and
• a second controller configured to switch to the low sensitivity audio recording mode when the digital gain reaches a second gain threshold and the current audio recording mode is the high sensitivity audio recording mode.