EP0392079A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Radio transceiver
Assignee: Mitsubishi Electric Corp
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Filing: 1989-11-08
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Granted: —
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Expires: 2009-11-08
Abstract
Abstract A radio transceiver includes a control section for setting a transmitting output level higher or lower than a prescribed output level within a tolerance range, in response to a signal from a level conversion circuit. The level conversion circuit may designate a lower transmitting output level to reduce power consumption, and may designate a higher transmitting output level in the presence of high noise levels.
Inventors
- 👤 Kenichi C/O Mitsubishi Denki K.K. Commun. Furuno
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 00:18
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/52; H04B; H04B1/00; H04B1/38; H04B1/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
156 words
A radio transceiver comprising: an amplifier for amplifying a transmitting signal at a variable transmitting output level; transmitting power detecting means for detecting the transmitting output level of said amplified signal; receiver means for outputting transmitting output level information contained in a received signal, which designates the transmitting output level; level conversoin means for outputting a conversion signal designating the transmitting output level of said amplifier to vary from the transmitting output level designated by said transmitting output level information by an amount within a prescribed tolerance range; control means responsive to said output level information and said conversion signal for outputting a transmitting output selection signal corresponding to the transmitting output level designated by said level information as modified by said level conversion means; and transmitting power control means responsive to said output selection signal and said detected output level for setting an amplification factor in said amplifier equal to said modified transmitting output level.
Claim 2
Dependent Claim
156 words
A radio transceiver comprising: an amplifier for amplifying a transmitting signal at a variable transmitting output level; transmitting power detecting means for detecting the transmitting output level of said amplified signal; receiver means for outputting transmitting output level information contained in a received signal, which designates the transmitting output level; level conversoin means for outputting a conversion signal designating the transmitting output level of said amplifier to vary from the transmitting output level designated by said transmitting output level information by an amount within a prescribed tolerance range; control means responsive to said output level information and said conversion signal for outputting a transmitting output selection signal corresponding to the transmitting output level designated by said level information as modified by said level conversion means; and transmitting power control means responsive to said output selection signal and said detected output level for setting an amplification factor in said amplifier equal to said modified transmitting output level.
Claim 3
Dependent Claim
113 words
A radio transceiver according to claim 1, wherein: said transmitting power detecting means includes a detector circuit comprising capacitance means for storing a DC voltage proportional to the output level of said amplified signal; said transmitting power control means includes a voltage generator having a selector for selecting one of a plurality of resistors corresponding to said transmitting output selection signal, the selected resistor forming part of a voltage divider for producing a reference voltage corresponding to said transmitting output selection signal; and a comparator for automatic gain control which controls the amplification factor of said amplifier such to make said DC voltage output by said detector be equal to said reference voltage.
Claim 4
Dependent Claim
41 words
A radio transceiver according to claim 2, wherein the comparator for automatic gain control comprises an operational amplifier having a non-inversion input terminal for receiving said reference voltage and an inversion input terminal for receiving the output voltage of said detector.
Claim 5
Dependent Claim
33 words
A radio transceiver according to claim 1 wherein said level conversion means includes a first switch which outputs a signal designating a reduction of the transmitting output level designated by said level information.
Claim 6
Dependent Claim
33 words
A radio transceiver according to claim 4, wherein said level conversion means comprises a second switch which outputs a signal designating an increase of the transmitting output level designated by said level information.
Claim 7
Dependent Claim
48 words
A radio transceiver according to claim 4, wherein said control means comprises a ROM which reads said transmitting output level information and said signal output from said first switch as address inputs, and outputs a transmitting output selection signal stored at the address indicated by said address input.
Claim 8
Dependent Claim
55 words
A radio transceiver according to claim 5, wherein said control means comprises a ROM which reads said transmitting output level information, said signal output from said first switch and said signal output from said second switch as address inputs and outputs a transmitting output selection signal stored at the address indicated by said address inputs.
Claim 9
Dependent Claim
42 words
A radio transceiver according to claim 4, wherein said control means comprises a programmable microprocessor which receives as inputs said transmitting level information and said signal output by said first switch, and outputs a transmitting output selection signal corresponding to said inputs.
Claim 10
Dependent Claim
51 words
A radio transceiver according to claim 5, wherein said control means comprises a programmable microprocessor which receives as inputs said transmitting output level information, said signal output from said first switch and said signal output from said second switch, and outputs a transmitting output selection signal in response to said inputs.
Claim 11
Dependent Claim
64 words
A radio transceiver according to claim 4, wherein the level conversion means comprises a voltage comparator which detects the output voltage of a battery and outputs a signal when the output voltage is lower than a predetermined level, and an OR circuit which performs a logical OR operation on said output signal from said first switch and said output signal from said voltage comparator.
Claim 12
Dependent Claim
63 words
A radio transceiver according to claim 5, wherein the level conversion comprises a voltage comparator which detects the output voltage of a battery and outputs a signal when the output voltage is lower than a predetermined level, and an OR circuit which performs a logical OR operation on said output signal from said first switch and said output signal from said voltage comparator.
Claim 13
Dependent Claim
46 words
A radio transceiver according to claim 10, further comprising an alarm means including at least one of a display section and a buzzer, wherein said control means detects the output signal of said voltage comparator and activates said display section or said buzzer in response thereto.
Claim 14
Dependent Claim
67 words
A radio transceiver according to claim 1, wherein the level conversion means comprises a field intensity detecting circuit for detecting the field intensity of a received signal; and means provided in said control means for outputting a signal designating a reduction of the transmitting output level when a received signal field intensity level detected by the field intensity detecting circuit is higher than a predetermined reference level.
Claim 15
Dependent Claim
45 words
A radio transceiver according to claim 13, wherein said control means comprises a ROM which reads said reduction designating signal and said transmitting output level information as address inputs, and outputs a transmitting output selection signal stored at the address indicated by said address inputs.
Claim 16
Dependent Claim
41 words
A radio transceiver according to claim 13, wherein said control means comprises a programmable microprocessor which receives as inputs said reduction designating sigrial and said transmitting output level information, and outputs a transmitting output selection signal in response to said inputs.
References Cited (Backward Citations)
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