Title:
DATA RATE REDUCING SURFACE ACOUSTIC WAVE DEVICE
Document Type and Number:
Japanese Patent JPS60263549
Kind Code:
A
Abstract:
A surface acoustic wave (SAW) device, and corresponding method, for expanding or contracting the time scale of an input signal that varies in time but is limited to a predetermined time interval. One embodiment of the invention achieves time expansion or compression by means of two Fourier transformations providing different chirp rates, and implemented in the form that includes only five SAW dispersive delay lines. In the illustrative version of this embodiment, three of the dispersive delay lines are used in conjunction with multipliers or mixers, and two are used as convolvers. Another embodiment of the invention uses only three SAW dispersive delay lines, two in conjunction with multipliers and one located between the multipliers to effect the desired time-scale change. A third embodiment of the invention employs a SAW tapped delay line and an associated set of gates to select successive data bit signals from successive output taps in the delay line. A SAW fill-in filter is used to fill in inter-bit gaps resulting from the use of the tapped delay line.
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Inventors:
KUO SHIYUN IEN
ROBAATO BURUUSU SUTOTSUKUSU
MAASHIYARU IYU FUAN
ROBAATO BURUUSU SUTOTSUKUSU
MAASHIYARU IYU FUAN
Application Number:
JP11633785A
Publication Date:
December 27, 1985
Filing Date:
May 29, 1985
Export Citation:
Assignee:
TRW INC
International Classes:
H04L27/18; H04B1/66; H04J3/18; (IPC1-7): H04L27/18
Attorney, Agent or Firm:
Minoru Nakamura
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