Claims
- 1. An electrical signal frequency analyser comprising:
- (i) means for reception of an input electrical signal comprising a plurality of different frequency components which are to be selectively detected,
- (ii) means for generating a progressively changing frequency signal,
- (iii) first mixing means for beating the input signal with said progressively changing frequency signal,
- (iv) filter means for a mixed product of the input signal and said progressively changing frequency signal to obtain from said mixed product signal the component within a predetermined range of frequencies,
- (v) signal strength detector means for evaluating the magnitude of a mixed filter signal component,
- (vi) means for inputting a series of spaced frequency signals,
- (vii) second mixing means for beating the spaced frequency signals with said progressively changing frequency signal,
- (viii) coincidence detecting means for producing an output upon a coincidence of the instantaneous frequency of said progressively changing frequency signal with any of the specific frequencies of said spaced frequency signals,
- (ix) control means for producing, from said coincidence detecting means output, a series of control signals, and
- (x) means for outputting, in accordance with said control signals, signal magnitudes evaluated in the signal strength detector means,
- whereby the signal magnitudes represent a spectrum-divided sequence of components of the input electrical signal in frequency steps determined by said coincidence detecting means.
- 2. An analyser according to claim 1 in which an output frequency of the generating means for said progressively changing frequency signal is regulated by a sweep voltage generator.
- 3. An analyser according to claim 2 in which the sweep voltage generator is a ramp generator.
- 4. An analyser according to claim 1 in which for outputting said series of spaced frequency signals, means are provided to generate a comb spectrum and to produce pulses from the spectrum containing a fundamental comb spectrum frequency and a series of harmonics thereof at spaced frequencies.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8825748 |
Nov 1988 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 07/429,377, filed on Oct. 31, 1989 which was abandoned upon the filing hereof.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
56210347 |
Jul 1983 |
JPX |
2076548 |
May 1980 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Hiscocks, "Audio Spectrum Analyser", vol. 86 (1980), pp. 55-60. |
Continuations (1)
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Number |
Date |
Country |
Parent |
429377 |
Oct 1989 |
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