EP0195573A2
Expired / Lapsed
EP
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Spread-spectrum signal generator
Assignee: QED Intellectual Property Ltd
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Filing: 1986-03-10
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Granted: —
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Expires: 2006-03-10
Abstract
Abstract A signal generator (1) produces a spread-spectrum bandwidth signal in the frequency range 40 to 90KHz for use in a domestic mainsborne signalling system, In the generator, sixteen individual frequencies, equi-spaced in that range, pass to samplers (5) operating at a clock frequency of 204.8KHz and then to quantisers (6) before storage. The resultant signals are then assembled in appropriate manner by selector switch (9) before being filtered when (temporarily) in the frequency domain. The resultant signals duly reach catalogue store (17), where output can be used for programming an EPROM in a mainsborne interface unit.
Inventors
- 👤 Ian David Kimber
- 👤 Nicholas Andrew Young
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7136; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; H04B2001/71362; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A signal generator for producing a spread-spectrum bandwidth signal ranged between specified frequenoies, the generator oharaoterised by: means (2-4) to produce a number of aingle-frequency signal waveforms, each having a distinctive frequency within the range of specified frequencies; means (5) to sample each of the single-frequency signal waveforms at a sampling rate exceeding the frequency of that waveform; means j(6) to quantise, between two or more levels, the sampling values of each waveform; and means (7-11) to combine together the quantised sampling values for a plurality of the waveforms in a predetermined fashion.
Claim 2
Dependent Claim
93 words
A signal generator for producing a spread-spectrum bandwidth signal ranged between specified frequenoies, the generator oharaoterised by: means (2-4) to produce a number of aingle-frequency signal waveforms, each having a distinctive frequency within the range of specified frequencies; means (5) to sample each of the single-frequency signal waveforms at a sampling rate exceeding the frequency of that waveform; means j(6) to quantise, between two or more levels, the sampling values of each waveform; and means (7-11) to combine together the quantised sampling values for a plurality of the waveforms in a predetermined fashion.
Claim 3
Dependent Claim
28 words
A signal generator according to Claim 1, characterised by means (7) to ensure phase continuity between quantised sampling values of separate waveforms upon joining at the combination means.
Claim 4
Dependent Claim
38 words
A signal generator according to Claim 1 or Claim 2, characterised by the waveform-production means (2-4) having a frequency distribution arranged to exclude waveforms at or closely adjacent one or more frequencies associated with common forms of interference.
Claim 5
Dependent Claim
44 words
A signal generator according to any one of the preceding claims characterised by the waveform-production means (2-4) having a frequency distribution arranged such that, in the resultant spectrum, one waveform has a first lower sideband lying over the main lobe of the adjacent waveforms.
Claim 6
Dependent Claim
29 words
A signal generator according to any one of the preceding claims, characterised by the combination means (7-11) incorporating a sample-and-hold device (10) to achieve appropriate assembly of the waveforms.
Claim 7
Independent Claim
16 words
A method of producing a spread-spectrum bandwidth signal ranged between specified frequencies, the method characterised by:
Claim 8
Independent Claim
16 words
A method of producing a spread-spectrum bandwidth signal ranged between specified frequencies, the method characterised by:
Claim 9
Dependent Claim
63 words
producing a number of single-frequency signal waveforms, each having a diatinctive frequency within the range of specified frequencies; sampling each of the aingle-frequency waveforms at a sampling rate exceeding the frequency of that waveform; quantising, between two or more levels, the sampling values of each waveform; and combining together the quantised sampling values for a plurality of the waveforms in a predetermined fashion.
Claim 10
Dependent Claim
63 words
producing a number of single-frequency signal waveforms, each having a diatinctive frequency within the range of specified frequencies; sampling each of the aingle-frequency waveforms at a sampling rate exceeding the frequency of that waveform; quantising, between two or more levels, the sampling values of each waveform; and combining together the quantised sampling values for a plurality of the waveforms in a predetermined fashion.
Claim 11
Dependent Claim
21 words
A method according to Claim 6, characterised by providing phase-continuity between quantised sampling values of separate waveforms at the combination step.
Claim 12
Dependent Claim
32 words
A method according to Claim 6 or Claim 7, including producing a number of aingle-frsquenay signal waveforms which exclude those at or closely adjacent any frequencies associated with common forms of interference.
Claim 13
Dependent Claim
42 words
An appliance unit for a mainsborne system, the unit characterised by a signal source comprising a solid-state storage device programmed with signals, which signals are derived from a signal generator by a method according to any one of Claims 6 to 8.
References Cited (Backward Citations)
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