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
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
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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