Abstract: In a system for transmitting packets over a link between a compressor and a decompressor, a method is provided for implicit packet type identification. A set of implicit packet transmission characteristics including at least first and second characteristics is selected, and the compressor is operated to assign the first and second transmission characteristics to packets of first and second packet types, respectively. The decompressor is operated to detect transmission characteristics of packets received by the decompressor, and to thereby identify a received packet as being either a first or second packet type. Usefully, header free packets comprise one of the packet types.

Abstract: Systems and methods are provided for Internet Protocol (IP) based communication systems without using a complete Internet Protocol stack on both sides of a communication link. Various exemplary embodiments include communication of audio information over a wireless transmission channel to a wireless terminal from a network that includes transmission of audio information using voice over Internet Protocol (VoIP). A first communication system and method may include a wireless terminal having a dedicated audio application that includes processing for header compression and decompression. A second communication system and method may include a wireless terminal and a network device (e.g., a network transmitter/receiver terminal), each containing at least a portion of an Internet Protocol stack, and the network device may include a header modification means that may reduce or eliminate the header from VoIP packets it will send to the wireless terminal.

Abstract: In packet communications that employ header compression/decompression, the computational complexity of checksum generation can be reduced by re-using static checksum information associated with header bits that do not change from header to header. The static checksum information can be used together with information about header bits that do change from header to header, in order to generate a desired checksum. The checksum can then be used to verify a reconstructed header produced from a compressed header by a header decompressor.

Abstract: A combined drop and spray nozzle device for use with a pressurized container for dispensing a product contained therein as an aerosol. The device includes an axially movable delivery outlet protruding from a top portion of the pressurized container, and a removable nozzle mounted on the delivery outlet for moving the delivery outlet between a closed position wherein the product is contained in the pressurized container and an open position wherein the product is discharged through the nozzle as an aerosol. A valve mechanism is axially movable in the nozzle with respect to the delivery outlet to open and close a predetermined portion of the delivery outlet, and a push-button is provided on the nozzle and is coupled to the valve mechanism for moving the valve mechanism to close the predetermined portion of the delivery outlet when the push-button is depressed and open the predetermined portion of the delivery outlet when the push-button is not depressed.