GB2279193A - Pulse width modulators - Google Patents
Pulse width modulators Download PDFInfo
- Publication number
- GB2279193A GB2279193A GB9410194A GB9410194A GB2279193A GB 2279193 A GB2279193 A GB 2279193A GB 9410194 A GB9410194 A GB 9410194A GB 9410194 A GB9410194 A GB 9410194A GB 2279193 A GB2279193 A GB 2279193A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inputs
- signal
- mark
- square wave
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/10—Combined modulation, e.g. rate modulation and amplitude modulation
Description
2279193 SIGNAL PROCESSING This invention relates to signal processing
apparatus and methods.
The invention is more particularly concerned with apparatus and methods for converting two separate input signals into an output that can be supplied over a single line.
In some applications it is necessary to monitor the state of an analogue signal and also to provide discrete ON/OFF or other low-accuracy measurements. The present invention enables these inputs to be combined so that they can be provided on a single line, thereby enabling the number of inputs to associated apparatus to be reduced.
According to one aspect of the present invention there is provided signal processing apparatus having two inputs, means for providing an alternating signal with a frequency dependent on one of the inputs, and means for controlling the mark-space ratio of a square wave signal at the same frequency as the alternating signal according to the other of the inputs so that the square wave signal is provided as a single output representative of both inputs.
The means for controlling the mark-space ratio is preferably arranged to set the ratio at one of two different values according to the value of the other of the inputs. The means for providing the alternating signal may include a voltage-to-frequency converter arranged to receive the one input, the voltage-to-frequency converter may be arranged to generate a triangular waveform at a frequency representative of the magnitude of the one input. The means for controlling the mark-space ratio preferably includes a pulse shaping circuit arranged to receive the triangular waveform and the other input, the pulse shaping circuit providing the single output.
According to another aspect of the present invention there is provided a method of processing two input signals including the steps of providing an alternating square wave signal with a frequency dependent on one of the inputs, controlling the mark-space ratio of the square wave signal according to the other of the inputs and providing the square wave signal as a single output representative of both inputs.
The mark-space ratio is preferably controlled to be at one of two different values according to the value of the other of the inputs.
Apparatus and a method of processing in accordance with the present invention will now be described, by way of example, with reference to the accompanying drawing, which shows the apparatus schematically.
The apparatus 1 has two inputs 2 and 3 and a single output 4. One of the inputs 2 is connected to receive, on line 5, an analogue input signal of variable value from a source 20. The other input 3 is connected to receive a discrete high/low or ON/OFF signal on line 6 from a source 30. This input signal may, for example, be high when associated equipment is functioning correctly and low when there is a fault in the equipment.
The apparatus I has a conventional voltage-to-frequency converter 7, which receives a signal from the first, analogue input 2 and provides an alternating output signal of triangular waveform and constant amplitude on line 8 to a pulse shaping circuit 9. The pulse shaping circuit 9 also receives an input from the other input 3 in the form of a discrete signal at one of two different voltages. The pulse shaping circuit 9 provides an alternating square wave signal to the output 4 via line10 the frequency of Which is dependent on the value of the analogue signal at the input 2. The amplitude of the square wave signal is constant and its mark-space ratio is set at one of two diffierent values according to the discrete value at the other input 3. In this way, the apparatus enables a single output to be provided that is representative of two different inputs.
It is not essential that one of the inputs be of a discrete, ON/OFF kind. It will be appreciated that the second input could also be of a variable, analogue kind and the mark-space ratio be correspondingly variable. Unfortunately, with presently available circuits it is not possible to control the mark-space ratio of a signal with high accuracy. It is preferable, therefore, for the mark-space ratio to be used to represent the input that needs to be known only with relatively low accuracy.
Claims (10)
1. Signal processing apparatus having two inputs, means for providing an alternating signal with a frequency dependent on one of the inputs, and means for controlling the mark-space ratio of a square wave signal at the same frequency as the alternating signal according to the other of the inputs so that the square wave signal is provided as a single output representative of both inputs.
2.
Signal processing apparatus according to Claim 1, wherein the means for controlling the mark-space ratio is arranged to set the ratio at one of two different values according to the value of the other of the inputs.
Signal processing apparatus according to Claim 1 or 2, wherein the means for providing the alternating signal includes a voltage-to-frequency converter arranged to receive said one input, wherein said voltage-tofrequency converter is arranged to generate a triangular waveform at a frequency representative Of the magnitude of the one input.
Signal processing apparatus according to Claim 3, wherein the means for controlling the mark-space ratio includes a pulse shaping circuit arranged to receive the triangular waveform and the other input, and wherein the pulse shaping circuit provides said single output.
5. Signal processing apparatus substantially as hereinbefore described with reference to the accompanying drawings.
6.
7.
8.
9.
A method of processing two input signals including the steps of providing an alternating square wave signal with a frequency dependent on one of the inputs, controlling the mark-space ratio of the square wave signal according to the other of the inputs and providing the square wave signal as a single output representative of both inputs.
A method according to Claim 6, wherein the mark-space ratio is controlled to be at one of two different values according to the value of the other of the inputs.
A method of processing two inputs signals substantially as hereinbefore described with reference to the accompanying drawing.
Apparatus for performing a method according to any one of Claims 6 to 8.
10. Any novel feature or combination of features as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9312377A GB9312377D0 (en) | 1993-06-16 | 1993-06-16 | Signal processing |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9410194D0 GB9410194D0 (en) | 1994-07-06 |
| GB2279193A true GB2279193A (en) | 1994-12-21 |
| GB2279193B GB2279193B (en) | 1997-12-17 |
Family
ID=10737234
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9312377A Pending GB9312377D0 (en) | 1993-06-16 | 1993-06-16 | Signal processing |
| GB9410194A Expired - Fee Related GB2279193B (en) | 1993-06-16 | 1994-05-23 | Signal processing |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9312377A Pending GB9312377D0 (en) | 1993-06-16 | 1993-06-16 | Signal processing |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4420302A1 (en) |
| FR (1) | FR2706700B1 (en) |
| GB (2) | GB9312377D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29619746U1 (en) * | 1996-11-13 | 1997-01-09 | Hella Kg Hueck & Co | Circuit arrangement for generating a pulse width modulated signal |
| DE19733382A1 (en) * | 1997-08-01 | 1999-02-04 | Fahrzeugklimaregelung Gmbh | Circuit generating PWM energising signals for clocked power end stage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100103A1 (en) * | 1982-07-28 | 1984-02-08 | Hitachi, Ltd. | A pulse width modulation circuit and an analog product forming integration circuit using such modulation circuit |
| EP0119281A1 (en) * | 1983-03-11 | 1984-09-26 | Fritz Fuss GmbH & Co. | Circuitry for the transmission of voltage signals |
| GB2247123A (en) * | 1987-10-28 | 1992-02-19 | Burr Brown Corp | Analog to duty-cycle modulation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4775841A (en) * | 1986-06-03 | 1988-10-04 | Trofimenkoff F N | Voltage to frequency conversion circuit with a pulse width to period ratio proportional to input voltage |
| JPH0632477B2 (en) * | 1988-01-25 | 1994-04-27 | 松下電器産業株式会社 | Signal transmission method |
-
1993
- 1993-06-16 GB GB9312377A patent/GB9312377D0/en active Pending
-
1994
- 1994-05-23 GB GB9410194A patent/GB2279193B/en not_active Expired - Fee Related
- 1994-06-09 FR FR9407211A patent/FR2706700B1/en not_active Expired - Lifetime
- 1994-06-10 DE DE19944420302 patent/DE4420302A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100103A1 (en) * | 1982-07-28 | 1984-02-08 | Hitachi, Ltd. | A pulse width modulation circuit and an analog product forming integration circuit using such modulation circuit |
| EP0119281A1 (en) * | 1983-03-11 | 1984-09-26 | Fritz Fuss GmbH & Co. | Circuitry for the transmission of voltage signals |
| GB2247123A (en) * | 1987-10-28 | 1992-02-19 | Burr Brown Corp | Analog to duty-cycle modulation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29619746U1 (en) * | 1996-11-13 | 1997-01-09 | Hella Kg Hueck & Co | Circuit arrangement for generating a pulse width modulated signal |
| DE19733382A1 (en) * | 1997-08-01 | 1999-02-04 | Fahrzeugklimaregelung Gmbh | Circuit generating PWM energising signals for clocked power end stage |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4420302A1 (en) | 1994-12-22 |
| FR2706700A1 (en) | 1994-12-23 |
| FR2706700B1 (en) | 1996-07-12 |
| GB2279193B (en) | 1997-12-17 |
| GB9312377D0 (en) | 1993-07-28 |
| GB9410194D0 (en) | 1994-07-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010523 |