US4878052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand-held transmitter for the emission of coded electromagnetic pulses, and a receiver for receiving pulses emitted by the transmitter
Assignee: ALLTRONIK GESELLSCHAFT fur ELEKTRONISCHE STEUERUNG und ANTRIEBE MBH A CORP OF GERMANY
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Filing: 1988-02-05
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Granted: 1989-10-31
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Expires: 2008-02-05
Abstract
Abstract The invention relates to a hand-held transmitter and a receiver tuned to e.g. for remote control of garage doors, the transmitter consisting of a current/voltage supply (100), a coding unit (200) generating coded electromagnetic pulses and with an adjustable code, a pulse shaper (300), an HF oscillator (400), an HF output stage (500), a filter (600) and an antenna (700). In order to simplify the construction of such a transmitter, it is suggested according to the invention that the oscillator (400) comprise a circuit which enables a reliable oscillation build-up pattern in a relatively wide range of frequencies around the rated frequency and that the filter (600) connected between the output stage (500) and the antenna (700) be a steeply flanked low-pass filter.
Inventors
- 👤 Matthias Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:17
CPC Classifications
G; G08; G08C; G08C17/00; G08C17/02; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; G08C19/00; G08C19/16; G08C19/28; H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/20; H04B1/202; G07C2009/00206; G07C2009/00753; G07C2009/00769; G07C2009/00793; H04B1/02; H04B1/03; H04B1/034
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
161 words
A hand-held transmitter for emitting coded electromagnetic pulses for reception and processing by a receiver tuned to said transmitter, preferably for the remote operation of garage doors, said transmitter comprising: (a) a current/voltage supply having output means; (b) a coded pulse generating coding unit with an adjustable code coupled to said output means of said current/voltage supply and having an output; (c) a pulse shaper having an output and coupled to said output of said coding unit; (d) an HF oscillator having an output and coupled to said current/voltage supply output means; (e) an HF output stage having an output and coupled to said pulse shaper output and to said oscillator output; (f) an antenna; and (g) a filter coupled between said HF output stage and said antenna; wherein said HF oscillator comprises a circuit which enables a reliable oscillation build-up pattern in a relatively wide range of frequencies around a rated frequency, and said filter is a steeply-flanked low-pass filter.
Claim 2
Dependent Claim
161 words
A hand-held transmitter for emitting coded electromagnetic pulses for reception and processing by a receiver tuned to said transmitter, preferably for the remote operation of garage doors, said transmitter comprising: (a) a current/voltage supply having output means; (b) a coded pulse generating coding unit with an adjustable code coupled to said output means of said current/voltage supply and having an output; (c) a pulse shaper having an output and coupled to said output of said coding unit; (d) an HF oscillator having an output and coupled to said current/voltage supply output means; (e) an HF output stage having an output and coupled to said pulse shaper output and to said oscillator output; (f) an antenna; and (g) a filter coupled between said HF output stage and said antenna; wherein said HF oscillator comprises a circuit which enables a reliable oscillation build-up pattern in a relatively wide range of frequencies around a rated frequency, and said filter is a steeply-flanked low-pass filter.
Claim 3
Dependent Claim
22 words
A transmitter according to claim 1, wherein the HF oscillator can be operated in the range from ±10% of its rated frequency.
Claim 4
Dependent Claim
28 words
A transmitter according to claim 1, wherein the HF oscillator includes a quartz resonator, a transistor and an oscillator circuit comprising at least one capacitor and a coil.
Claim 5
Dependent Claim
23 words
A transmitter according to claim 1, wherein the antenna includes a trimming capacitor and in which the antenna is energised via a tapping.
Claim 6
Dependent Claim
20 words
A transmitter according to claim 1, wherein a capacitor is provided at the input of the antenna for impedance transformation.
Claim 7
Dependent Claim
42 words
A transmitter according to claim 1, wherein said output stage includes a transistor having a low potential terminal, said pulse shaper is a trapezoidal pulse shaper and its said output is connected to said low potential terminal of said output stage transistor.
Claim 8
Dependent Claim
23 words
A transmitter according to claim 1, wherein the low-pass filter has a flank steepness of at least 60 dB to the first harmonic.
Claim 9
Dependent Claim
28 words
A transmitter according to claim 1, wherein the coding unit comprises a microprocessor which has a selectable number of information bits selectively consisting of 12 or 22 bits.
Claim 10
Dependent Claim
23 words
A transmitter according to claim 8, wherein said coding unit includes a diode matrix circuit for setting a part of the code number.
Claim 11
Dependent Claim
37 words
A transmitter according to claim 8, wherein said coding unit further includes a coding bridge, said coding unit being adapted to trigger various functions which can be set via said coding bridge connected in the coding unit.
Claim 12
Dependent Claim
23 words
A transmitter according to claim 1, wherein the individual component elements are mounted on a wafer using the SMD (surface mounted device) technology.
Claim 13
Dependent Claim
247 words
A receiver for receiving coded electromagnetic pulses emitted by a transmitter according to claim 1, said receiver comprising: (a) a current/voltage supply having output means; (b) a high frequency receiver part having an output and coupled to said current/voltage supply output means and including: (1) an HF antenna input circuit for receiving an incoming signal; (2) an HF/IF amplifier and mixer part having output means and coupled to said receiver part ouput; (3) an HF oscillator coupled to said amplifier and mixer part; (4) a demodulator coupled to said output means of said amplifier and mixer part; and (5) a signal amplitude control circuit and level converter having an output and coupled to said output means of said amplifier and mixer part; (c) a decoding unit with a code selector circuit having an output and coupled to said output of said control circuit and level converter; and (d) an input/output interface circuit coupled to said decoding unit output; wherein the HF oscillator of the high frequency receiver part resonates in a wide frequency range and comprises a circuit which enables a reliable oscillation build-up pattern in a relatively wide range of frequencies around the rated frequency, and wherein the HF antenna circuit further comprises an antenna oscillator circuit which has a trimming capacitor, and wherein the incoming signal is output from the antenna oscillator circuit through a capacitive divider, the divider being taken to earth on the HF side of the antenna oscillator circuit via a capacitor.
Claim 14
Dependent Claim
35 words
A receiver according to claim 12, wherein a non-trimmable wide band pass filter is connected in the high frequency receiver part between the signal output from the HF/IF amplifier and mixer part and the demodulator.
Claim 15
Dependent Claim
46 words
A receiver according to claim 12, wherein the high frequency receiver part further includes a ceramic IF filter and a resistor connected between the output of the mixer part and the ceramic IF filter to adjust the working point of the HF/IF amplifier and mixer part.
Claim 16
Dependent Claim
17 words
A receiver according to claim 12, wherein the decoding unit comprises a microprocessor with an adjustable code.
Claim 17
Dependent Claim
20 words
A receiver according to claim 15, wherein the decoding unit further comprises a diode matrix circuit for adjusting the code.
Claim 18
Dependent Claim
34 words
A receiver according to claim 15, wherein the microprocessor is connected to a reset circuit for automatically restoring the decoding unit to normal operating condition in the event of interference pulses or programming errors.
Claim 19
Dependent Claim
23 words
A receiver according to claim 12, wherein the input/output circuit incorporates low voltage recognition means to detect low voltage output from the receiver.
Claim 20
Dependent Claim
15 words
A receiver according to claim 12, wherein the input/output circuit contains a power-on reset circuit.
Claim 21
Dependent Claim
57 words
A receiver according to claim 12, wherein the input/output circuit is constructed as an adaptor circuit including internal soldered bridges which are selectively bridges so that the adaptor circuit can function selectively as an alternating current input/output, a direct current input/output and as a potential free output in conjunction with the direct current or alternating current input.
Claim 22
Dependent Claim
34 words
A receiver according to claim 12, wherein the input/output circuit includes means for providing current limitation, means to provide reverse polarity protection for direct current outputs and also means to provide pulse duration limitation.
Claim 23
Dependent Claim
19 words
A receiver according to claim 12, wherein the individual component elements are mounted on a wafer using SMD technology.
Claim 24
Dependent Claim
21 words
A transmitter according to claim 1, and further comprising fixed capacitive means coupling the HF oscillator to the HF output stage.
Claim 25
Independent Claim
251 words
A method for coding electromagnetic transmission pulses comprising the steps of: providing a supply of current/voltage to a code generator, to an HF oscillator and to an HF output stage; generating coded electromagnetic pulses with an adjustable code wherein by a time-based tripartition of the bit information of the transmitted code (pulse telegram), the proposition concerning logical significance ensues in accordance with the following precept, in that after a flank fall from high to low and a subsequent flank rise from low to high after one-third of the transmission preset for one bit, a logic zero is transmitted, but upon a subsequent flank rise from low to high after two-thirds of the transmission time preset for one bit, a logic one is transmitted, wherein a pulse telegram 26 bits long is used, consisting of a 22 bit information part followed by a synchronizing pause 4 bits long, consisting of a low signal and a flank transition from low to high after the second third of the fourth pause bit; shaping the generated pulses; applying the shaped pulses to an HF output stage to provide an output signal; providing HF oscillations to the HF output stage; filtering the output signals from the HF output stage; and then applying the filtered signals to an antenna for transmission therefrom; the HF oscillator enables a reliable build-up pattern in a relatively wide range of frequencies around the rated frequency, the filter is a steeply-flanked low-pass filter connected between the HF output stage and the antenna.
Claim 26
Independent Claim
251 words
A method for coding electromagnetic transmission pulses comprising the steps of: providing a supply of current/voltage to a code generator, to an HF oscillator and to an HF output stage; generating coded electromagnetic pulses with an adjustable code wherein by a time-based tripartition of the bit information of the transmitted code (pulse telegram), the proposition concerning logical significance ensues in accordance with the following precept, in that after a flank fall from high to low and a subsequent flank rise from low to high after one-third of the transmission preset for one bit, a logic zero is transmitted, but upon a subsequent flank rise from low to high after two-thirds of the transmission time preset for one bit, a logic one is transmitted, wherein a pulse telegram 26 bits long is used, consisting of a 22 bit information part followed by a synchronizing pause 4 bits long, consisting of a low signal and a flank transition from low to high after the second third of the fourth pause bit; shaping the generated pulses; applying the shaped pulses to an HF output stage to provide an output signal; providing HF oscillations to the HF output stage; filtering the output signals from the HF output stage; and then applying the filtered signals to an antenna for transmission therefrom; the HF oscillator enables a reliable build-up pattern in a relatively wide range of frequencies around the rated frequency, the filter is a steeply-flanked low-pass filter connected between the HF output stage and the antenna.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |