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A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital information wit

A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital information within the estimated number of bits to produce encoded data; removing selected bits from the encoded data; adding bits corresponding to digital messages to the encoded information to form a composite modem frame; formatting the composite modem frame bits to produce formatted composite modem frame bits; and transmitting the formatted composite modem frame bits. The invention also encompasses transmitters that perform the method.

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A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital information wit

A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital information within the estimated number of bits to produce encoded data; removing selected bits from the encoded data; adding bits corresponding to digital messages to the encoded information to form a composite modem frame; formatting the composite modem frame bits to produce formatted composite modem frame bits; and transmitting the formatted composite modem frame bits. The invention also encompasses transmitters that perform the method. modulated radio frequency band signal transmitted from the base station. 2. The mobile station according to claim 1, wherein said spreading circuit spreads the data signal to be transmitted with a spreading ratio according to a bit rate of said data signal. 3. The mobile station according to claim 2, wherein a spread code for spreading the data signal has a constant chip rate. 4. The mobile station according to claim 1, further comprising: a despreading circuit despreading the demodulated radio frequency band signal. 5. The mobile station according to claim 4, wherein said despreading circuit extracts a pilot signal by despreading the demodulated radio frequency band signal using the spread spectrum code assigned to the pilot signal, and wherein the phase shift is detected from the extracted pilot signal. 6. A method for transmitting a data signal in a mobile station for use with mobile communication system multiplexing a plurality of communication channels using spread spectrum codes, comprising the steps of: demodulating a received radio frequency band signal transmitted from a base station by use of a signal from an oscillator; spreading a data signal to be transmitted; and modulating said spread data signal by use of a signal from the oscillator, wherein an oscillation frequency of the oscillator is controlled by use of a change of phase shift detected using a signal representing a phase shift detected from the demodulated radio frequency band signal transmitted from the base station. 7. The method for transmitting a data signal according to claim 6, wherein the spreading circuit spreads the data signal to be transmitted with a spreading ratio according to a bit rate of said data signal. 8. The method for transmitting a data signal according to claim 7, wherein a spread code for spreading the data signal has a constant chip rate. 9. The method for transmitting a data signal according to claim 6, further comprising the step of: despreading the demodulated radio frequency band signal. 10. The method for transmitting a data signal according to claim 6, further comprising the step of: extracting a pilot signal by despreading the demodulated radio frequency band signal using the spread spectrum code assigned to the pilot signal, wherein the phase shift is detected from the extracted pilot signal. 11. A method for detecting a data signal by a mobile station for use with mobile communication system multiplexing a plurality of communication channels using spread spectrum codes, comprising the steps of: demodulating a received radio frequency band signal transmitted from a base station by use of a signal from an oscillator; detecting a phase shift from the demodulated radio frequency band signal; and controlling an oscillation frequency of the oscillator according to a change of the phase shift. 12. The method for detecting a data signal according to claim 11, further comprising the step of: extracting a pilot signal by despreading the demodulated radio frequency band signal using the spread spectrum code assigned to the pilot signal, wherein the phase shift is detected from the extracted pilot signal. lement, forwarding the inbound packet to the processing element at which the other packet from the same source is pending. 3. The method according to claim 2, further comprising: if no other packet from the same source is pending at any processing element, forwarding the inbound packet to a processing element selected in accordance with a predetermined algorithm. 4. The method according to claim 2, further comprising: if no other packet from the same source is pending at any processing element, forwarding the inbound packet to a processing element selected in accordance with a predetermined load balancing algorithm. 5. The method according to claim 2, further comprising: if no other packet from the same source is pending at any processing element, forwarding the inbound packet to a processing element having the lowest backlog of packets. 6. A method for preserving packet order integrity in a switching engine wherein packets are forwarded to different ones of a plurality of processing elements within a processor array for switching, comprising checking for each inbound packet whether a source of the packet is committed to a processing element within the processor array before forwarding the inbound packet to the processor array. 7. A method for preserving packet order integrity in a switching engine wherein packets are forwarded to different ones of a plurality of processing elements within a processor array for switching, comprising: determining if a source of an inbound packet is committed to any processing element; and if the source of the inbound packet is committed to any processing element, forwarding the inbound packet to the processing element to which the source is committed. 8. The method according to claim 7, further comprising: if the source of the inbound packet is not committed to any processing element, forwarding the inbound packet to a processing element selected in accordance with a predetermined algorithm. 9. The method according to claim 7, further comprising: if the source of the inbound packet is not committed to any processing clement, forwarding the inbound packet to a processing clement selected in accordance with a predetermined load balancing algorithm. 10. The method according to claim 7, further comprising: if the source of the inbound packet is not committed to any processing element, forwarding the inbound packet to a processing element having the lowest backlog of packets. 11. In a switching engine wherein packets from different sources are forwarded to different ones of a plurality of parallel processing elements for switching, a method for preserving packet order integrity, comprising: committing a source to processing element; and forwarding inbound packets from the source to the processing clement and no other processing element until the commitment is released 12. The method according to claim 11, wherein the commitment is released when all the inbound packets from the source have been switched from the processing element. 13. A switching engine to switch packets from a plurality of sources comprising: a processor array to switch the packets and provide them as output, the processor array including a plurality of parallel processing elements; and a plurality of input controllers to receive the packets from the plurality of sources and to provide the received packets to the processor array, wherein the input controller, after receiving a packet, determines whether another packet from the same source is pending within the processor array before forwarding the packet to the processor array, wherein the processor array provides packets from each of the plurality of sources as output in the order they are received as to preserve packet order integrity of the packets from the same source. 14. The switching engine of claim 13 wherein each input controller, after receiving a packet, determines whether another packet from the same source is pending