US4627099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication apparatus for transmitting and receiving signals on different frequency bands
Assignee: Pioneer Corp
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Filing: 1984-12-26
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Granted: 1986-12-02
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Expires: 2004-12-26
Abstract
Abstract A communication apparatus comprises a first oscillator for generating a frequency fp 1 at each channel step; a second oscillator for generating a modulated frequency fp 2 ; a first mixer for creating a transmission frequency which is a sum fp 1 +fp 2 of the frequencies of the first and second oscillators and a difference fp 1 -fp 2 therebetween on high and low band transmissions respectively; a third oscillator for generating a frequency fp 3 which is higher or lower than the frequency fp 2 of the second oscillator by a given frequency Δf; and a second mixer for creating a sum fp 1 +fp 3 of the frequencies of the first and third oscillators means and a difference fp 1 -fp 3 therebetween on low and high band transmissions respectively.
Inventors
- 👤 Masashi Shimakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:47
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
200 words
A communication apparatus for receiving and transmitting signals at different frequencies comprising (a) a first oscillator means for generating a frequency fp 1 at each of a plurality of channels; (b) a second oscillator means for generating a modulated frequency fp 2 ; (c) a first mixer means for creating a transmission frequency which is a sum fp 1 +fp 2 of the frequencies of the first and second oscillator means and a difference fp 1 -fp 2 therebetween on high and low band transmissions respectively; (d) a third oscillator means for generating a frequency fp 3 which is higher or lower than the frequency fp 2 of the second oscillator means by a given frequency Δf; and (e) a second mixer means for creating a local oscillator frequency f L which is a sum fp 1 +fp 3 of the frequencies of the first and third oscillation means at high band transmission and low band receiving modes and a difference fp 1 -fp 3 at low band transmission and high band receiving modes, and (f) third mixer means for mixing a received signal with the local oscillator frequency f L to provide an intermediate frequency signal f IF .
Claim 2
Dependent Claim
200 words
A communication apparatus for receiving and transmitting signals at different frequencies comprising (a) a first oscillator means for generating a frequency fp 1 at each of a plurality of channels; (b) a second oscillator means for generating a modulated frequency fp 2 ; (c) a first mixer means for creating a transmission frequency which is a sum fp 1 +fp 2 of the frequencies of the first and second oscillator means and a difference fp 1 -fp 2 therebetween on high and low band transmissions respectively; (d) a third oscillator means for generating a frequency fp 3 which is higher or lower than the frequency fp 2 of the second oscillator means by a given frequency Δf; and (e) a second mixer means for creating a local oscillator frequency f L which is a sum fp 1 +fp 3 of the frequencies of the first and third oscillation means at high band transmission and low band receiving modes and a difference fp 1 -fp 3 at low band transmission and high band receiving modes, and (f) third mixer means for mixing a received signal with the local oscillator frequency f L to provide an intermediate frequency signal f IF .
Claim 3
Dependent Claim
39 words
The apparatus as defined in claim 1 and further including a circulator between the first mixer means and an antenna for feeding a transmission frequency f t =fp 1 ±fp 2 to the antenna from the first mixer means.
Claim 4
Dependent Claim
51 words
The apparatus as defined in claim 2 and wherein said third mixer means mixes a receiving frequency of a received signal f R fed via the circulator with the local oscillator frequency f L from the second mixer means to provide an intermediate frequency f IF =|f L -f R |.
Claim 5
Dependent Claim
30 words
The apparatus as defined in claim 3 in which the receiving frequency f R is equal to the transmission frequency f t ± an transmission-receiving frequency interval Δf 1 .
Claim 6
Dependent Claim
48 words
The apparatus as defined in claim 4 in which the intermediate frequency f IF is determined as a sum of the transmission receiving frequency interval Δf 1 and a difference Δf 2 ,3 between the frequencies fp 2 and fp 3 of the second and third oscillator means.
Claim 7
Dependent Claim
37 words
The apparatus as defined in claim 5 in which the frequency difference Δf 2 ,3 is 19.11 MHz and the frequency interval Δf 1 is 39 MHz so that the intermediate frequency f IF is 58.11 MHz.
Claim 8
Dependent Claim
18 words
The apparatus as defined in claim 3 and further including a demodulator which demodulates the intermediate frequency signal.
Claim 9
Dependent Claim
40 words
The apparatus as defined in claim 3 in which the local frequency f L from the second mixer means is injected into the third mixer means as lower and higher local frequencies at high and low band receiving modes respectively.
Claim 10
Dependent Claim
51 words
The apparatus as defined in claim 1 in which the second mixer means creates a local frequency fp 1 -fp 3 =878.905 MHz at low band transmission and high band receiving modes and a local frequency fp 1 +fp 3 =956.125 MHz at high band transmission and low band receiving modes.
Claim 11
Dependent Claim
27 words
The apparatus as defined in claim 1 in which the first, second and third oscillator means include a first, second and third phase locked loops (PLLs) respectively.
Claim 12
Dependent Claim
27 words
The apparatus as defined in claim 10 in which the first PLL which forms the first oscillator means has a comparison frequency identical with a channel separation.
Claim 13
Dependent Claim
39 words
The apparatus as defined in claim 11 in which the channel separation is 30 KHz and the first PLL provides an oscillation frequency fp 1 which is obtained by multiplying the channel separation by an integer N 1 .
Claim 14
Dependent Claim
44 words
The apparatus as defined in claim 12 in which N 1 is 31028 and fp 1 is 930.849 MHz at a low band transmission mode and in which N 1 is 30118 and fp 1 is 903.540 MHz at a high band transmission mode.
Claim 15
Dependent Claim
19 words
The apparatus as defined in claim 12 further comprising means for switching communication channels by changing N 1 .
Claim 16
Dependent Claim
45 words
The apparatus as defined in claim 10 in which the second PLL forming the second oscillator means has a comparison frequency which is 65 KHz and provides a frequency fp 2 which is obtained by multiplying the comparison frequency by an integer N 2 .
Claim 17
Dependent Claim
43 words
The apparatus as defined in claim 15 in which N 2 is 505 and fp 2 is 32.825 MHz at a low band transmission mode and N 2 is 515 and the fp 2 is 33.475 MHz at a high band transmission mode.
Claim 18
Dependent Claim
19 words
The apparatus as defined in claim 16 in which direct FM modulation is made in the second oscillation means.
Claim 19
Dependent Claim
45 words
The apparatus as defined in claim 10 in which the third PLL forming a third oscillator means has a comparison frequency which is 65 KHz and provides a frequency fp 3 which is obtained by multiplying the comparison frequency by an integer N 3 .
Claim 20
Dependent Claim
44 words
The apparatus as defined in claim 18 in which N 3 is 799 and fp 3 is 51.953 MHz at a low band transmission mode and the N 3 is 809 and the fp 3 is 52.585 MHz at a high band transmission mode.
Claim 21
Dependent Claim
47 words
The apparatus as defined in claim 10 and further including a reference oscillator and a first, second and third frequency dividers having a division ratios N 1 , N 2 and N 3 respectively between the reference oscillator and the respective first, second and third oscillator means.
Claim 22
Dependent Claim
31 words
The apparatus as defined in claim 20 in which the oscillation frequency of the reference oscillator is a common multiple of the comparison frequencies of the first, second and third PLLs.
Claim 23
Dependent Claim
56 words
The apparatus as defined in claim 21 in which the oscillation frequency of the reference oscillator is 12.48 MHz and the frequency division ratio of the first frequency divider N 1 is 1/2 5 ×13 and the frequency division ratios of the second and third frequency dividers N 2 and N 3 are 1/2 6 ×3.
Claim 24
Dependent Claim
36 words
The apparatus as defined in claim 20 in which transmission frequency is changed when high and low band modes are switched by changing the frequency division ratios N 1 , N 2 and N 3 .
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |