Abstract: A single crystal oscillator RF transmitter system converts a data to be transmitted into RF packets by a converter under the control of a microprocessor, receives the RF packets and generates an RF signal accordingly to be sent out by a transmitter. The system comprises a local oscillator to generate a first clock in response to an external crystal to provide for the transmitter and connected to a clock switch which divides the frequency of the first clock so as to generate a second clock to the microprocessor and a third clock to the converter. Alternatively, an RC oscillator generates a fourth clock for the clock switch to provide the second and third clocks for the microprocessor and converter, respectively.

Abstract: A wireless communication encoding and decoding technique using variable length codes is disclosed. The coding technique defines the transmission time for a high bit in a continuous bit stream as (N×T) expressed in terms of time unit (T), and a low bit as (M×T). By assigning different transmission times to represent high and low bits in continuous bit streams, the total data transmission time can be reduced considerably in handling large amounts of digital data as compared with conventional coding techniques. Other advantages using this coding technique include power saving by the data communication device, which may be a battery-powered peripheral device or mobile unit, and more reliable signal synchronization at both ends of the communication link.

Abstract: A wireless communication encoding and decoding technique using variable length codes is disclosed. The coding technique defines the transmission time for a high bit in a continuous bit stream as (N×T) expressed in terms of time unit (T), and a low bit as (M×T). By assigning different transmission times to represent high and low bits in continuous bit streams, the total data transmission time can be reduced considerably in handling large amounts of digital data as compared with conventional coding techniques. Other advantages using this coding technique include power saving by the data communication device, which may be a battery-powered peripheral device or mobile unit, and more reliable signal synchronization at both ends of the communication link.

Abstract: A remedy for data loss generated during a wireless communication process is to incorporate a data sequence identification field into a data frame to be transmitted from a wireless transmitting end to a wireless receiving end. The data sequence identification field contains a first data value representing a sequence number of the data frame, and the wireless receiving end records a second data value representing the sequence number of the data frame next to the last data frame the wireless receiving end has received. The wireless receiving end compares the first data value with the second value to determine whether the received data frame is a succession of the last data frame the wireless receiving end has received, so as to remind the user of the lost data frame by generating alarm signal or send retransmission request signal to request the wireless transmitting end to retransmit the lost data frame.