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Cellular telephone audio input compensation system and method
| Details |
Inventors: Ahmed, Syed Arif; Millar, Douglas James;
Assignee: Sharp Microelectronics Technology, Inc. (Camas, WA); Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Bhattacharya; Sam
Attorney, Agent or Firm: Maliszewski; Gerald, Ripma; David C.
A cellular telephone transmitter is provided, including a selectable gain microphone amplifier, to transmit vocal signals to the receiver of a communicating telephone. The telephone transmitter including a variable gain amplifier to amplify the vocal signal picked up by the microphone, a gain controller to vary the gain of the amplifier, and a selector associated with the gain controller which allows the telephone user to choose the gain of the amplifier. The telephone user intermittently activates the selector, while speaking, to choose an amplifier gain level appropriate to the volume of the input vocal signal. In particular, the user can elect to temporarily boost the gain while whispering into the phone. A method is also disclosed. |
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DETAILED DESCRIPTION This invention relates generally to cellular telephones for communicating audio signals, and more particularly to a system of controlling audio signals in a cellular telephone transmitter to compensate for low volume audio input levels.
Cellular telephones, and telephones in general, are designed with a microphone to accept audio inputs from the telephone user and a speaker to provide an audio output to the telephone user.
For most customary uses of cellular telephones these audio inputs and outputs are predominately in the form of vocal communications.
The microphone is the audio input to the transmitter section of the telephone, and the speaker is the audio output of the receiver section of the telephone.
Typically, the transmitter and receiver, or at least major portions of the transmitter and receiver, are co-located in a telephone handset.
For simplicity of design and convenience to the telephone user, the gain and power levels of the microphone and speaker levels are generally fixed.
These fixed levels have been chosen to adequately communicate a normal conversational level vocal input.
That is, the transmitter has been designed to provide a signal sufficient to drive the speaker of the communicating receiver at a predetermined power level in response to a predetermined audio input level into the microphone.
It is assumed, and generally valid, that the vocal inputs of the normal telephone user will fall within the predetermined microphone input range to which the telephone's audio systems have been designed.
Likewise, it is assumed that predetermined audio output levels from the speaker of the telephone are adequate to satisfy the needs of a normal telephone user.
Since the telephone has a long history of use, the predetermined, or normal, audio input and output power levels are well understood.
In some countries, such as Europe, these normal audio levels are codified into telephone specifications.
Audio communications between telephone users can be interrupted if abnormal audio levels are input to the telephone transmitter microphone
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Cell Phones 
