Patent EP0227458A2 successfully refreshed from Google Patents.
EP0227458A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Diversity receiver
Assignee: NEC Corp
•
Filing: 1986-12-22
•
Granted: —
•
Expires: 2006-12-22
Abstract
Abstract A diversity receiver includes first and second receivers (3. 41, a first switch (6). a comparator (5), a second switch (7), and a controller (8). The first and second receiver (3. 4) have receiver antennas (1.2) and generate demodulated signals and electric field detection outputs in accordance with received electric fields, respectively. The first switch (6) performs switching between the demodulated signals from the first and second receivers (3, 4) in accordance with an output switching control signal and outputs a selected demodulated signal. The comparator (5) compares the electric field detection outputs from the first and second receivers (3. 4), respectively. and supplies the output switching control signal to the first switch (6). The second switch (7) turns on/off a power source of the first receiver (3) in accordance with a power source switching control signal. The controller (8) receives the electric field detection output from the second receiver (4), calculates an average intensity of the electric field, and supplies the power source switching control signal to the second switch (7) in accordance with the average intensity of the electric field.
Inventors
- 👤 Kazuya C/O Nec Corporation Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 15:14
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1607; H04B1/1615; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0817; H04B7/082; H04L; H04L1/00; H04L1/0001; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0225; H04W52/0245; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A diversity receiver comprising: first and second receivers (3, 4) having receiver antennas (1, 2) and generating demodulated signals and electric field detection outputs in accordance with received electric fields, respectively; a first switch (6) for switching between the demodulated signals from said first and second receivers (3, 4) in accordance with an output switching control signal and outputting a selected one of the demodulated signals; and comparing means (5) for comparing the electric field detection outputs from said first and second receivers (3, 4), respectively, and supplying the output switching control signal to said first switch (6) in accordance with the result of said comparison, characterized by comprising: a second switch (7) for turning on/off a power supply source of said first receiver (3) in accordance with a power source switching control signal; and a controller (8) for receiving the electric field detection output from said second receiver (4), averaging intensity of the received electric field, and supplying the power source switching control signal to said second switch (7) in accordance with the average intensity of the electric field.
Claim 2
Dependent Claim
180 words
A diversity receiver comprising: first and second receivers (3, 4) having receiver antennas (1, 2) and generating demodulated signals and electric field detection outputs in accordance with received electric fields, respectively; a first switch (6) for switching between the demodulated signals from said first and second receivers (3, 4) in accordance with an output switching control signal and outputting a selected one of the demodulated signals; and comparing means (5) for comparing the electric field detection outputs from said first and second receivers (3, 4), respectively, and supplying the output switching control signal to said first switch (6) in accordance with the result of said comparison, characterized by comprising: a second switch (7) for turning on/off a power supply source of said first receiver (3) in accordance with a power source switching control signal; and a controller (8) for receiving the electric field detection output from said second receiver (4), averaging intensity of the received electric field, and supplying the power source switching control signal to said second switch (7) in accordance with the average intensity of the electric field.
Claim 3
Dependent Claim
56 words
A diversity receiver according to claim 1, wherein said controller (8) comprises a low pass filter (11) for filtering the electric field detection output from said second receiver (4), and a comparator (12) for comparing an output from said low pass filter (11) with a predetermined reference voltage and for outputting the power source switching signal.
Claim 4
Dependent Claim
195 words
A diversity receiver comprising: first and second receivers (3, 4) having receiving antennas (1, 2) and generating demodulated signals and electric field detection outputs in accordance with received electric fields. respectively; a first switch (6) for switching between the demodulated signals from said first and second receivers (3, 4) in accordance with an output switching control signal and outputting a selected one of the demodulated signals: and comparing means (5) for comparing the electric field detection outputs from said first and second receivers (3. 4), respectively, and supplying the output switching control signal to said first switch (6) in accordance with the result of said comparison. characterized by comprising: first and second power source switches (7. 11) for turning on/off a power source (Vcc) of said first and second receivers (3. 4) in accordance with first and second power source switching control signals, respectively: and a controller (8') for receiving the electric field detection outputs from said first and second receivers (3, 4), and supplying the first and second power source switching control signals to said first and second power source switches (7, 11) in accordance with the magnitudes of the electric field detection outputs.
Claim 5
Dependent Claim
195 words
A diversity receiver comprising: first and second receivers (3, 4) having receiving antennas (1, 2) and generating demodulated signals and electric field detection outputs in accordance with received electric fields. respectively; a first switch (6) for switching between the demodulated signals from said first and second receivers (3, 4) in accordance with an output switching control signal and outputting a selected one of the demodulated signals: and comparing means (5) for comparing the electric field detection outputs from said first and second receivers (3. 4), respectively, and supplying the output switching control signal to said first switch (6) in accordance with the result of said comparison. characterized by comprising: first and second power source switches (7. 11) for turning on/off a power source (Vcc) of said first and second receivers (3. 4) in accordance with first and second power source switching control signals, respectively: and a controller (8') for receiving the electric field detection outputs from said first and second receivers (3, 4), and supplying the first and second power source switching control signals to said first and second power source switches (7, 11) in accordance with the magnitudes of the electric field detection outputs.
Claim 6
Dependent Claim
223 words
A diversity receiver according to claim 3, wherein said controller (8') comprises: first and second low pass filters (21, 22) for generating average voltages V1 and V2 of the electric field detection outputs from said first and second receivers (3, 4). respectively: first and second comparators (23, 25) for comparing outputs from said first and second low pass filters (21, 22) with a reference voltage Vr: a third comparator for comparing the outputs of the first and second low pass filters with each other; and a logic circuit (24. 26, 27. 28, 29, 30. 31, 32, 33. 34, 35) for (1) turning on said first and second power source switches (7, 11) and performing selective diversity operation when V1 < Vr and V2 < Vr, (2) turning off and on said first and second power source switches (7. 11). respectively, when V1 < Vr and V2 > . (3) turning on and off said first and second power source switches (7. 11), respectively. when V1 > Vr and V2 < Vr, and (4) comparing V1 with V2 when V1 > Vr and V2 > Vr, and turning on and off said first and second power source switches (7. 11). respectively, when V1 > V2, and turning off and on said first and second power source switches (7, 11). respectively, when V1 < V2.
Claim 7
Dependent Claim
183 words
A diversity receiver comprising: first and second antennas (51. 52); first and second receivers (53. 54) for amplifying and demodulating received waves from said first and second antennas (51. 52). respectively. and detecting and outputting intensities of received electric fields: and an output switching switch (59) for switching and outputting one of outputs from said first and second receivers (53. 54) in accordance with an output switching control signal: characterized by comprising: a first input switch (57) for selecting said first or second antenna (51 or 52) and connecting the selected antenna to said first receiver (53); a second input switch (58) for turning on/off connection between said second antenna (52) and said second receiver (54): a power source switch (60) for turning on/off a power source of said second receiver (54); and a controller (55) for receiving the received electric field intensity outputs from said first and second receivers (53, 54) and controlling ON/ OFF of said first and second input switches (57. 58) and said power source switch (60) in accordance with the magnitudes of the received electric field intensity outputs.
Claim 8
Dependent Claim
183 words
A diversity receiver comprising: first and second antennas (51. 52); first and second receivers (53. 54) for amplifying and demodulating received waves from said first and second antennas (51. 52). respectively. and detecting and outputting intensities of received electric fields: and an output switching switch (59) for switching and outputting one of outputs from said first and second receivers (53. 54) in accordance with an output switching control signal: characterized by comprising: a first input switch (57) for selecting said first or second antenna (51 or 52) and connecting the selected antenna to said first receiver (53); a second input switch (58) for turning on/off connection between said second antenna (52) and said second receiver (54): a power source switch (60) for turning on/off a power source of said second receiver (54); and a controller (55) for receiving the received electric field intensity outputs from said first and second receivers (53, 54) and controlling ON/ OFF of said first and second input switches (57. 58) and said power source switch (60) in accordance with the magnitudes of the received electric field intensity outputs.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.