Patent EP0500373A2 successfully refreshed from Google Patents.
EP0500373A2
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EP
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Time division duplex transmitter-receiver
Assignee: Sony Corp
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Filing: 1992-02-20
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Granted: —
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Expires: 2012-02-20
Abstract
Abstract A time division duplex transmitter-receiver is disclosed which is capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively. The transmitter-receiver comprises a transmitting circuit (10) having means (62, 63, 64, 65, 66) for generating a carrier signal (Si) ; a receiving circuit (20) having an oscillator (62, 67, 68) for generating an oscillation signal (Sj) for converting a received signal (Sir) into an intermediate frequency signal (Sjr), and a mixer (25) to mix the received signal (Sir) with the oscillation signal (Sj) ; a signal path (15, 33, 23) for supplying a leakage signal (S39) from the transmitting circuit (10) to the receiving circuit (20) ; a frequency discriminator (72) for converting the frequency (fj) of the intermediate frequency signal (Sjr) obtained from the receiving circuit (20) into a voltage (V72) ; means (31) for storing the voltage therein ; and means (31, 61) for controlling the oscillation frequency (fi-fj) of the oscillator in accordance with voltage (V72). Since the frequency (fi-fj) of oscillation is controlled in conformity with the reference voltage (V72), an AFC action can be executed under varied environmental conditions.
Inventors
- 👤 Kunio c/o Patents Div. Sony Corp. Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:14
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H03; H03J; H03J1/00; H03J1/0008; H03J1/0041; H03J1/005; H03J7/00; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
176 words
A time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said transmitter-receiver comprising: a transmitting circuit (10) having means (62, 63, 64, 65, 66) for generating a carrier signal (Si); a receiving circuit (20) having an oscillator (62, 67, 68) for generating an oscillation signal (Sj) for converting a received signal (Sir) into an intermediate frequency signal (Sjr), and a mixer (25) to mix said received signal (Sir) with said oscillation signal (Sj); a signal path (15, 33, 23) for supplying a leakage signal (S39) from said transmitting circuit (10) to said receiving circuit (20); a frequency discriminator (72) for converting the frequency (fj) of said intermediate frequency signal (Sjr) obtained from said receiving circuit (20) into a voltage (V72); means (31) for storing said voltage (V72) therein; and means (31, 61) for controlling the oscillation frequency (fi-fj) of said oscillator (62, 67, 68) in dependence on said voltage (V72).
Claim 2
Dependent Claim
176 words
A time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said transmitter-receiver comprising: a transmitting circuit (10) having means (62, 63, 64, 65, 66) for generating a carrier signal (Si); a receiving circuit (20) having an oscillator (62, 67, 68) for generating an oscillation signal (Sj) for converting a received signal (Sir) into an intermediate frequency signal (Sjr), and a mixer (25) to mix said received signal (Sir) with said oscillation signal (Sj); a signal path (15, 33, 23) for supplying a leakage signal (S39) from said transmitting circuit (10) to said receiving circuit (20); a frequency discriminator (72) for converting the frequency (fj) of said intermediate frequency signal (Sjr) obtained from said receiving circuit (20) into a voltage (V72); means (31) for storing said voltage (V72) therein; and means (31, 61) for controlling the oscillation frequency (fi-fj) of said oscillator (62, 67, 68) in dependence on said voltage (V72).
Claim 3
Dependent Claim
44 words
A transmitter-receiver according to claim 1, comprising means (75, 76, 31) for detecting the level of the signal (Sjr) obtained from said receiving circuit (20) and for determining whether said receiving circuit (20) has received said leakage signal (S39) from said transmitting circuit (10).
Claim 4
Dependent Claim
52 words
A transmitter-receiver according to claim 1 or claim 2, comprising means (62) for generating a common oscillation signal (S62); means (67, 68) for deriving said oscillation signal (Sj) from said common oscillation signal (S62); and means (63, 64, 65, 66) for deriving said carrier signal (Si) from said common oscillation signal (S62).
Claim 5
Dependent Claim
80 words
A transmitter-receiver according to any one of the preceding claims, wherein said signal path includes a mixer (15) for converting an intermediate frequency transmission signal (Sit) into a transmission signal (St) of a predetermined channel frequency (fs); a mixer (23) for converting a received signal (Sr) of said predetermined channel frequency (fs) into a received signal (Sir) of an intermediate frequency (fi); and a synthesizer oscillator (33) for supplying a predetermined local oscillation signal (Sc) to said mixers (15, 23).
Claim 6
Dependent Claim
29 words
A transmitter-receiver according to any one of the preceding claims, wherein said frequency discriminator (72) includes means (731, 732, 733, 734) for averaging said voltage over a predetermined time.
Claim 7
Dependent Claim
47 words
A transmitter-receiver according to claim 5, wherein said averaging means comprises a resistor (731), a first capacitor (732), and a series circuit connected in parallel with said first capacitor (732) and comprising a switch (733) and a second capacitor (734) greater in capacitance than said first capacitor.
Claim 8
Independent Claim
218 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a first non-modulated carrier signal from a transmitting circuit (10) to a receiving circuit (20) in said transmitter-receiver; mixing said first non-modulated carrier signal (S39) supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency of said intermediate frequency signal into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); receiving by said receiving circuit (20) a second non-modulated carrier signal transmitted from a remote station; mixing said second non-modulated carrier signal thus received with the local oscillation signal (Sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (sjr); converting the frequency (fj) of said second-mentioned intermediate frequency signal (sjr) into a second output voltage (V72); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (V72) becomes coincident with said first output voltage (Vrf).
Claim 9
Independent Claim
218 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a first non-modulated carrier signal from a transmitting circuit (10) to a receiving circuit (20) in said transmitter-receiver; mixing said first non-modulated carrier signal (S39) supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency of said intermediate frequency signal into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); receiving by said receiving circuit (20) a second non-modulated carrier signal transmitted from a remote station; mixing said second non-modulated carrier signal thus received with the local oscillation signal (Sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (sjr); converting the frequency (fj) of said second-mentioned intermediate frequency signal (sjr) into a second output voltage (V72); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (V72) becomes coincident with said first output voltage (Vrf).
Claim 10
Dependent Claim
24 words
A method according to claim 7, wherein said second non-modulated carrier signal is included in an originating-call request signal and/or an originating-call answer signal.
Claim 11
Independent Claim
218 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a first non-modulated carrier signal (S39) from a transmitting circuit (10) to a receiving circuit (20) in said transmitter-receiver; mixing said first non-modulated carrier signal (S39) supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency (fj) of said intermediate frequency signal (Sjr) into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); receiving a control signal (80) through a control channel by said receiving circuit (20); mixing the control signal (80) thus received with the local oscillation signal (sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency (fj) of said second-mentioned intermediate frequency signal (Sjr) into a second output voltage (Vav); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (Vav) becomes coincident with said first output voltage (Vrf).
Claim 12
Independent Claim
218 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a first non-modulated carrier signal (S39) from a transmitting circuit (10) to a receiving circuit (20) in said transmitter-receiver; mixing said first non-modulated carrier signal (S39) supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency (fj) of said intermediate frequency signal (Sjr) into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); receiving a control signal (80) through a control channel by said receiving circuit (20); mixing the control signal (80) thus received with the local oscillation signal (sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting the frequency (fj) of said second-mentioned intermediate frequency signal (Sjr) into a second output voltage (Vav); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (Vav) becomes coincident with said first output voltage (Vrf).
Claim 13
Dependent Claim
16 words
A method according to claim 9, comprising the step of averaging said second output voltage (Vav).
Claim 14
Independent Claim
210 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a transmission signal from a transmitting circuit (10) to a receiving circuit (20) in the transmitter-receiver for a predetermined time; mixing the transmission signal supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (sjr); converting the frequency (fj) of said first intermediate frequency signal into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); mixing the signal received by the receiving circuit during reception slots (R) with the local oscillation signal (sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting, for a predetermined time, the frequency (fj) of said second-mentioned intermediate frequency signal (Sj) into a second output voltage (V72); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (V72) becomes coincident with said first output voltage.
Claim 15
Independent Claim
210 words
A method of automatic frequency control in a time division duplex transmitter-receiver capable of dividing one channel into transmission slots (T) and reception slots (R) with respect to time and performing time-divided transmission and reception of data during such slots (T, R) respectively, said method comprising the steps of: supplying a transmission signal from a transmitting circuit (10) to a receiving circuit (20) in the transmitter-receiver for a predetermined time; mixing the transmission signal supplied to said receiving circuit (20) with a local oscillation signal (Sj) obtained from an oscillator (62), and converting the mixed signal into an intermediate frequency signal (sjr); converting the frequency (fj) of said first intermediate frequency signal into a first output voltage (Vrf); storing said first output voltage (Vrf) in a memory means (31); mixing the signal received by the receiving circuit during reception slots (R) with the local oscillation signal (sj) obtained from said oscillator (62), and converting the mixed signal into an intermediate frequency signal (Sjr); converting, for a predetermined time, the frequency (fj) of said second-mentioned intermediate frequency signal (Sj) into a second output voltage (V72); and controlling the oscillation frequency (fx) of said oscillator in such a manner that said second output voltage (V72) becomes coincident with said first output voltage.
Claim 16
Dependent Claim
16 words
A method according to claim 11, comprising the step of averaging said first output voltage (Vrf).
References Cited (Backward Citations)
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