GB1350102A - Demodulator - Google Patents
DemodulatorInfo
- Publication number
- GB1350102A GB1350102A GB5421171A GB5421171A GB1350102A GB 1350102 A GB1350102 A GB 1350102A GB 5421171 A GB5421171 A GB 5421171A GB 5421171 A GB5421171 A GB 5421171A GB 1350102 A GB1350102 A GB 1350102A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- filter
- missing
- sample
- sampler
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/02—Demodulating pulses which have been modulated with a continuously-variable signal of amplitude-modulated pulses
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/02—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups
- C09B23/06—Methine or polymethine dyes, e.g. cyanine dyes the polymethine chain containing an odd number of >CH- or >C[alkyl]- groups three >CH- groups, e.g. carbocyanines
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Analogue/Digital Conversion (AREA)
- Amplifiers (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
1350102 Pulse modulation systems T T FJ€LLBRANT 22 Nov 1971 [23 Nov 1970] 54211/71 Heading H4L A signal (dotted line Fig. 2a) which has been sampled at periodically varying intervals is demodulated by adding to it in circuit 1 a signal 12 representing the missing samples e required to make up a uniformly sampled signal f, and filtering the result at 2. Amplifier 3 produces the output U. If the notional uniform sampling signal shown at f has a period T, the varying sample periods of input a may be for example nT, (n+1)T, nT, &c., so that a generally lower (varying) sample frequency can be used for a given maximum frequency ¢T of the signal being sampled. The missing samples e may be generated in Fig. 1 by applying the demodulated output b to a uniform rate sampler 4 and to a variable rate sampler 5 whose rate varies in the same way as the sample rate of the input a. A subtractor at 6 derives e. The filter 2 may be an analogue or gate-and-store type, and timing for the sampler 4 is controlled either by a clock or by the input signal. Alternatively (Fig. 3, not shown) the output U is fed to one sampler 7 which samples at the missing sample times. In another embodiment (Fig. 4, not shown) a plurality of adding circuit is used, each receiving the input signal a through successive delays (J), and the missing samples each being derived by a filter 2 amplifier 3 and a missing sample generator (7), as in the Fig. 3 embodiment, but in this ease with the filter 2 being connected to the output of the previous adder circuit, or in the case of the first stage, the filter receiving the input signal a at 1. If a digital filter (F, Fig. 5, not shown) is used, the missing samples are generated by a gate circuit (G) operated at appropriate periods.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1581070A SE347852B (en) | 1970-11-23 | 1970-11-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1350102A true GB1350102A (en) | 1974-04-18 |
Family
ID=20301266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5421171A Expired GB1350102A (en) | 1970-11-23 | 1971-11-22 | Demodulator |
Country Status (7)
Country | Link |
---|---|
CA (1) | CA934301A (en) |
DE (1) | DE2158224A1 (en) |
FR (1) | FR2115931A5 (en) |
GB (1) | GB1350102A (en) |
NL (1) | NL7115911A (en) |
SE (1) | SE347852B (en) |
SU (1) | SU462363A3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626827A (en) * | 1982-03-16 | 1986-12-02 | Victor Company Of Japan, Limited | Method and system for data compression by variable frequency sampling |
-
1970
- 1970-11-23 SE SE1581070A patent/SE347852B/xx unknown
-
1971
- 1971-11-18 NL NL7115911A patent/NL7115911A/xx unknown
- 1971-11-19 DE DE19712158224 patent/DE2158224A1/en active Pending
- 1971-11-22 GB GB5421171A patent/GB1350102A/en not_active Expired
- 1971-11-22 SU SU1715894A patent/SU462363A3/en active
- 1971-11-22 FR FR7141766A patent/FR2115931A5/fr not_active Expired
- 1971-11-23 CA CA128372A patent/CA934301A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626827A (en) * | 1982-03-16 | 1986-12-02 | Victor Company Of Japan, Limited | Method and system for data compression by variable frequency sampling |
Also Published As
Publication number | Publication date |
---|---|
SE347852B (en) | 1972-08-14 |
CA934301A (en) | 1973-09-25 |
NL7115911A (en) | 1972-05-25 |
SU462363A3 (en) | 1975-02-28 |
FR2115931A5 (en) | 1972-07-07 |
DE2158224A1 (en) | 1972-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |