Multiplex communications – Wide area network – Packet switching
Patent
1984-10-17
1991-09-24
Kuntz, Curtis A.
Multiplex communications
Wide area network
Packet switching
370109, 375122, 381 33, H04J 306, H04B 166
Patent
active
050519913
ABSTRACT:
Time delay compensation is inserted into a digital signal processing channel having compressed bandwidth portions at a point where the bandwidth is compressed. Since a smaller number of bits per unit of information is present at such a point, this reduces the number of bits which must be buffered to achieve a given amount of time delay compensation. For example, in a subband coder/decoder using a non-symmetrical QMF filter tree, the necessary time delay compensation in the various subband channels is effected subsequent to a digital bandwidth compression encoding step on the transmitter side. On the receiver side, similar time compensation may be provided in the subband channels prior to a digital bandwidth expansion decoding step. By implementing the necessary digital time delay compensation at a point in the system where the signals are bandwidth compressed to a maximum degree (i.e. using a minimum number of bits per second to transmit given information), digital memory requirements for implementing the digital time delay compensation are minimized.
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Ericsson - GE Mobile Communications Inc.
Kuntz Curtis A.
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