Abstract: A compact portable cellular telephone extension that provides additional electronic functions is implemented in a case attachable to a first external surface of the cellular phone to form a physically integral unit. A connector is supported by the case and couples the extension electronics to the cellular phone electronics. The connector connects through a second external surface of the cellular phone that lies in a plane different from the plane of the first external surface. A speaker arm extends from the case and supports a speaker unit. The speaker arm is positionable in a first position adjacent a third external surface of the cellular phone and in a second position away from the third external surface allowing the case to be readily attached and detached.

Abstract: A compact portable cellular telephone extension that provides additional electronic functions is implemented in a case attachable to a first external surface of the cellular phone to form a physically integral unit. A connector is supported by the case and couples the extension electronics to the cellular phone electronics. The connector connects through a second external surface of the cellular phone that lies in a plane different from the plane of the first external surface. A speaker arm extends from the case and supports a speaker unit. The speaker arm is positionable in a first position adjacent a third external surface of the cellular phone and in a second position away from the third external surface allowing the case to be readily attached and detached.

Abstract: A data transfer system is described for transferring analog data from a source to a destination by treating the analog data as a continuous series of segments sequentially compressing segments of the analog data and then multiplexing the compressed analog data with analog encoded digital data including synchronization data. The resultant multiplexed data stream is then provided to a data channel for transfer. The synchronization data included with the analog encoded digital data is used to resynchronize the demultiplexer of a receiver receiving the multiplexed data stream. The analog encoded digital data is demultiplexed and demodulated while the analog data is decompressed to realize again the continuous analog data stream as originally provided to the data source.