Equalizer and equalizing circuit using the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKazuo Saito
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Abstract
An equalizing circuit comprises a hopping-type amplitude equalizer (70) for changing the characteristics of burst signals inputted sequentially thereto to desired characteristics. The output of the equalizer (70) is distributed by a distributor (23) to a desired number of paths. Each output path of the distributor (23) is provided with a hopping switch (25a, 25b, or 25c), which is operated in synchronism with the amplitude equalizer (70). Consequently, even if the number of signal paths is increased, the number of equalizers required is smaller than the number of signal paths.
Claims20
An equalizing circuit (20) interposed in a signal transmission line for changing the characteristics of a transmitted signal to desired characteristics, comprising:
- equalizing means (70, 90) for changing a plurality of serially input burst signals by providing thereto plural predetermined characteristics in a time division manner,
- signal distributing means (23) for distributing said signals changed by said equalizing means (70, 90) to a desired number of paths, and
- switching means (25a, 25b, 25c) coupled to respective output terminals of said signal distributing means (23) for turning on and off in synchronism with the operation of said equalizing means (70, 90),
- said equalizing means and said switching means responsive to a hopping control signal to provide to said burst signals different equalizing characteristics for different switched connections.
A single equalizer (70, 90) interposed in a signal transmission line of a TDMA system for compensating characteristics of a plurality of burst signals transmitted on a single line, comprising:
- coefficient applying means (78, 98) for applying a coefficient to provide a predetermined equalization for said transmitted signal,
- coefficient setting means (81, 82, 83, 102) for setting a plurality of coefficients of said equalizer to different predetermined values for different time periods of said TDMA system, and
- coefficient selecting means (84, 83, 103) for selectively providing to said coefficient applying means the coefficients set by said coefficient setting means in accordance with a hopping signal of the TDMA system.
In a TDMA system, the improvement comprising:
- a hopping equalizer means receiving a sequence of signal bursts,
- said hopping equalizer means responsive to a hopping control signal for changing a characteristic thereof to equalize each of the signal bursts received thereby, and
- plural hopping switch means receiving an output of said hopping equalizer means,
- said plural hopping switch means responsive to said hopping control signal for passing a sequence of signal bursts equalized by different equalization characteristics of said hopping equalizer means in a time division manner on a plurality of outputs.
Dependencies are inferred from the claim text.