CA2305710C

CA2305710C - Waveform shaping method and equipment

Info

Publication number: CA2305710C
Application number: CA002305710A
Authority: CA
Inventors: Yoshio Urabe; Shouichi Koga; Hitoshi Takai; Koji Kai; Hidetoshi Yamasaki
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1993-06-25
Filing date: 1994-06-23
Publication date: 2003-09-16
Anticipated expiration: 2014-06-23
Also published as: CA2305710A1; CA2305706A1; CA2305706C

Abstract

In the transmitter which carries out burst transmission using information data as a packet, if the status is divided into four modes, namely, burst stop mode, burst rising mode, burst continuous mode, and burst falling mode, a waveform shaping equipment designed to read out shaped waveform data for each mode from outputs of either of the two memory tables, the first memory table which holds waveform data for specific data patterns used in common in burst rising mode and burst falling mode and the second memory table which holds waveform data for all data patterns used in the burst continuous mode, or a waveform shaping equipment comprising the third memory table which holds waveform data corresponding to all the data patterns used in the burst rising mode and the fourth memory table which holds waveform data corresponding to all data patterns used in the burst falling mode generating shaped waveform data by synthesizing the two outputs of the third and the fourth memory tables at the time of burst continuous mode.

Claims

1. A waveform shaping equipment for generating and providing signal waveforms corresponding to packets having dummy data and using information data as an input, forming packets comprising the information data and dummy data, extracting at least a portion of the packets with the dummy data and successively forming patterns, and successively concatenating partial waveforms read out from a memory means based on the patterns;
wherein, i) signals for indicating a start of the information data are starting signals, ii) signals for indicating the end of the information data are end signals, iii) predetermined periods between a start of a readout of the partial waveforms and an end of the readout of the partial waveforms are a spare sequence, iv) a period for reading out the partial waveforms excluding the spare sequence is a an ordinary sequence, v) the memory means comprises sub memory means and main memory means, vi) the sub memory means stores the partial waveforms in the spare sequence, and vii) the main memory means stores the partial waveforms in the ordinary sequence, the waveform shaping equipment comprising:
pattern generating means for i) forming the packets with the dummy data and ii) generating the patterns, and control means for generating i) the dummy data, ii) input control signals for the pattern generating means, iii) output control signals for a) switching a readout of the partial waveforms from the sub memory means to the main memory means a first specified time period after the starting signals are received, and b) switching the readout of the partial waveforms from the main memory means to the sub memory means a second specified time period after the end signals are received, and iv) readout signals, said readout signals control a readout of specific partial waveforms from the. memory means, wherein, the dummy data and the input control signals are provided to the pattern generating means, the starting signals and the end signals are externally provided to the control means, and an output of the pattern generating means is provided to the control means, and the output control signals and the readout signals are received by the main memory means and sub memory means, and the signal waveforms are output from the main memory means in the ordinary sequence, and the signal waveforms are output from the sub memory means in the spare sequence.

2. A waveform shaping equipment according to claim 1, wherein the memory means comprises semiconductor memories, the pattern generating means comprises shift registers, and the control means controls the readout of the partial waveforms from the memory means based on outputs of a sequencer for holding a time period based on the application of start and end signals.

3. A waveform shaping equipment according to claim 1, wherein the memory means comprises semiconductor memories, the pattern generating means comprises shift registers, and the control means controls the readout of the partial waveforms from the memory means based on the outputs of a sequencer for holding a time period based on the application of start and end signals, wherein the sequencer comprises a shift registers.

4. A waveform shaping equipment according to claim 1, wherein the memory means comprises semiconductor memories, and the control means generates binary readout signals for reading out the partial waveforms held in the semiconductor memories by decoding multi-level patterns generated by the pattern generating means.

5. Waveform shaping equipment comprising:
a controller including a sequencer, a counter;
a comparing unit for i) comparing output signals of said sequencer and said counter and ii) generating a plurality of control signals, and a generator for generating dummy data;
pattern generating means having a data selector for selecting between the dummy data and delayed information data; and a memory having a main memory table and a sub memory table in which partial waveforms of binary and ternary patterns are stored, respectively.

6. The waveform shaping equipment according to claim 5, further comprising a delay circuit wherein said comparing unit generates a first control signal to control said delay circuit and said data selector.

7. The waveform shaping equipment according to claim 5, wherein said comparing unit generates a second control signal to control to said memory.

8. The waveform shaping equipment according to claim 5, wherein said comparing unit generates a third control signal to control said generator.

9. Waveform shaping equipment comprising:
control means including i) a counter, ii) a sequencer, iii) a comparing unit, and iv) a dummy data generator, said comparing unit compares output signals of said sequencer and said counter and generates a plurality of control signals and said generator generates an acknowledge signal .and dummy data;
a pattern generator including i) a data selector, ii) a delay circuit and iii) a shift register, wherein said data selector selects between one of delayed information data from said delay circuit and said dummy data responsive to at least one of said plurality of control signals; and memory means having a main memory table and a sub memory table in which partial waveforms of binary and ternary patterns are stored respectively, and said partial waveforms are read from said main memory table and said sub memory table based on an output of said counter.

10. The waveform shaping equipment according to claim 9, wherein said comparing unit generates a first control signal to control said delay circuit and said data selector.

11. The waveform shaping equipment according to claim 9, wherein said comparing unit generates a second control signal to control said memory means.

12. A waveform shaping equipment according to claim 9, wherein said comparing unit generates a third control signal to control said generator.