Abstract
In a broadcast telephone system for communicating information signals over an assigned frequency channel, the combination of a synthesizer for generating a signal at the assigned frequency and a PROM storing a plurality of sets of first and second signals associated with different predetermined assignable frequencies. The synthesizer includes a first phase-locked loop for generating an output signal at a frequency within a first predetermined range including the plurality of assignable frequencies in response to the combination of a first frequency reference signal having a predetermined frequency and a second reference frequency signal having a frequency within a second predetermined range and derived from a second phase-locked loop a second phase-locked loop for generating a third reference frequency signal within a third predetermined range in response to a combination of a first signal from the PROM associated with a given assignable frequency and a fourth frequency reference signal having a predetermined frequency; and a frequency divider coupled to the PROM for dividing the frequency of the output signal from the second phase-locked loop by an amount indicated by a second signal from the PROM associated with said given assignable frequency to provide the second reference signal to the first phase-locked loop. The phase-locked loops each include a minimizing phase noise and electronic noise due to microphonics.
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Technologies
Multiple access
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Use Cases
Services
Claim
1. Frekvenssyntetiseringsanordning i ett rundradio- telefonisystem för sändning av informationssignaler över en tilldelad frekvenskanal, k ä n n e t e c k n a d av kombinationen av en syntetiserare för alstring av en signal på den tilldelade frekvensen och ett läsminne (10) (ROM) för lagring av ett flertal uppsättningar av första och andra signaler, vilka är förenade med olika, förutbestämda, tilldelningsbara sekvenser, vilken syntetiserare innefattar: (a) en första faslåst slinga, som omfattar: en första spänningsstyrd oscillator (26), vilken är anordnad att alstra en utsignal vid en frekvens innan- för ett första förutbestämt område som innefattar nämnda flertal tilldelningsbara frekvenser; en blandare (28), vilken är anordnad att blanda utsignalen från den första spänningsstyrda oscillatorn (26) med en första referensfrekvenssignal; en första faskomparator (32), vilken är anordnad att dels jämföra en produkt från blandaren (28) med en andra referensfrekvenssignal, vars frekvens ligger innanför ett andra förutbestämt område och utvinnes från en andra faslåst slinga (14), dels alstra en första spänningssignal som anger resultatet av nämnda jämförelse- I och ett första bandpassfilter (34), vilket är anordnat att vidaresända den första spänningssignalen till den första spänningsstyrda oscillatorn (26) för styrning av den första spänningsstyrda oscillatorn (26), varvid det första bandpassfiltrets (34) passband är anordnat att minimera fasstörningar och elektroniskt brus till följd av mikrofoni; (b) en andra faslåst slinga (l4), som omfattar: en andra spänningsstyrd oscillator (36), vilken är anordnad att alstra en tredje referensfrekvenssignal innanför ett tredje förutbestämt område; "fl 4% 10 15 20 25 30 35 467 902 9 en till ROM-minnet (10) ansluten första frekvens- delare (38), vilken är anordnad att dela frekvensen hos utsignalen från den andra spänningsstyrda oscillatorn (36) med en delningsfaktor som bestäms av en från ROM- minnet avgiven första signal, som är förenad med en given tilldelningsbar frekvens; en andra faskomparator (40), vilken är anordnad att dels jämföra den frekvensdelade utsignalen från den andra spänningsstyrda oscillatorn (36) med en fjärde referensfrekvenssignal, dels bilda en andra spännings- signal som anger resultatet av nämnda jämförelse; och ett andra bandpassfilter (42), vilket är anordnat att vidaresända den andra spänningssignalen till den andra spänningsstyrda oscillatorn (36) för styrning av den andra spänningsstyrda oscillatorn (36), varvid det andra bandpassfiltrets (42) passband är anordnat att minimera fasstörningar och elektroniskt brus till följd av mikrofoni; och -(c) en till ROM-minnet (l0) ansluten andra frekvens- delare) vilken är anordnad att dela frekvensen hos ut- signalen från den andra spänningsstyrda oscillatorn (36) med en delningsfaktor som bestäms av en från ROM- minnet (10) avgiven andra signal, som är förenad med nämnda givna, tilldelningsbara frekvens, för att avge den andra referensfrekvenssignalen till den första fas- komparatorn (32).
2. Anordning enligt kravet 1, k ä n n e t e c k - n a d av att den första referensfrekvenssignalen har en förutbestämd frekvens som utvinnes från en gemensam referensfrekvenssignal, och att den fjärde referens- frekvenssignalen har en förutbestämd frekvens som utvinnes från nämnda gemensamma referensfrekvenssignal.
3. Anordning enligt kravet 2, k ä n n e t e c k - n a d av ett lâgpassfilter (30), vilket är anordnat att vidaresända den lågfrekventa produkten från blandaren (28). 467 992 10
4. Anordning enligt kravet 1, k ä n n e t e c k - n a d av att ROM-minnet (10) är ett programmerbart läsminne (PROM).']
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