GB676276A - An arrangement for determining the amplitude of an electric wave selected from a complex wave - Google Patents
An arrangement for determining the amplitude of an electric wave selected from a complex waveInfo
- Publication number
- GB676276A GB676276A GB22726/50A GB2272650A GB676276A GB 676276 A GB676276 A GB 676276A GB 22726/50 A GB22726/50 A GB 22726/50A GB 2272650 A GB2272650 A GB 2272650A GB 676276 A GB676276 A GB 676276A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequencies
- frequency
- fundamental
- amplitude
- harmonics
- 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.)
- Expired
Links
- 238000010009 beating Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 2
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
676,276. Telephone transmission systems. STANDARD TELEPHONES & CABLES Ltd. Sept. 15, 1950 [Jan. 21, 1950], No. 22726/50. Class 40 (iv). [Also in Group XXXVI] In an arrangement for determining the amplitude of the harmonics of a variable fundamental # 0 in a complex signal, a signal representing the fundamental frequency controls a series of constant-amplitude sources of oscillations to cause them to produce frequencies F 1 +# 0 , F 2 +2# 0 , ... F n +nf n , where F 1 ... Fn are fixed frequencies. These frequencies are then mixed with the complex signal to produce frequencies F 1 ... F n having amplitudes proportional to those of the respective harmonics. The arrangement is suitable for use in a system such as that described in Specification 667,196 in which a voice signal is represented in transmission by signals representing the amplitude and frequency of the fundamental, and the amplitudes of the harmonics. As shown, Fig. 1, the fundamental frequency selector 2 feeds a circuit 3 whose output consists of a D.C. voltage proportional to the frequency of the fundamental. This voltage is fed to thermionic reactances 7, 8 ... 9 forming parts of the tuned circuits of the oscillators 11, 12 ... 13 which are thereby caused to emit constant amplitude signals of frequencies F 1 +# 0 , F 2 +2# 0 , ... F n +n# 0 . The signals are mixed with the complex wave in mixers 14, 15 ... 16, the respective harmonics beating with these frequencies to produce frequencies F 1 ... F n of amplitudes proportional to those of the harmonics. These may be converted to D.C. potentials by detectors 18, 20 ... 22 for feeding to the utilization apparatus 6 which is also fed with the fundamental frequency from the circuit 2. In a modification, Fig. 2 (not shown), the circuit 3 feeds only one thermionic reactance circuit to produce a frequency F+# 0 from which frequencies 2F+2# 0 , ... nF+n# 0 are produced by frequency multiplication for beating with the complex signal. In a further modification, Fig. 3 (not shown), even this thermionic reactance is eliminated by passing the fundamental through a limiter whose output is mixed with an oscillation F to produce the frequency F+f n .
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US139927A US2553610A (en) | 1950-01-21 | 1950-01-21 | Harmonic amplitude selector for signaling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB676276A true GB676276A (en) | 1952-07-23 |
Family
ID=22488927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22726/50A Expired GB676276A (en) | 1950-01-21 | 1950-09-15 | An arrangement for determining the amplitude of an electric wave selected from a complex wave |
Country Status (2)
Country | Link |
---|---|
US (1) | US2553610A (en) |
GB (1) | GB676276A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2983870A (en) * | 1956-07-03 | 1961-05-09 | Panoramic Radio Products Inc | Multiple band spectrum analyzer |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3045181A (en) * | 1962-07-17 | Spectrum tape recorder | ||
US2627541A (en) * | 1951-06-20 | 1953-02-03 | Bell Telephone Labor Inc | Determination of pitch frequency of complex wave |
US2759999A (en) * | 1952-10-23 | 1956-08-21 | Ohmega Lab | Inter-communicating telephone systems |
US2840639A (en) * | 1952-12-31 | 1958-06-24 | Itt | Method and apparatus for signal presentation |
US3054053A (en) * | 1958-02-20 | 1962-09-11 | Reed Res Inc | Passive detection and wave analyzer system |
GB937434A (en) * | 1959-02-24 | 1963-09-18 | Nippon Electric Co | A vowel synthesizer |
US3213199A (en) * | 1962-01-02 | 1965-10-19 | Bissett Berman Corp | System for masking information |
-
1950
- 1950-01-21 US US139927A patent/US2553610A/en not_active Expired - Lifetime
- 1950-09-15 GB GB22726/50A patent/GB676276A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2983870A (en) * | 1956-07-03 | 1961-05-09 | Panoramic Radio Products Inc | Multiple band spectrum analyzer |
Also Published As
Publication number | Publication date |
---|---|
US2553610A (en) | 1951-05-22 |
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