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.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
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Specification Information
Specification Information
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Technologies
Multiple access
Product
Use Cases
Services
Claim
1. Frequenzsyntheseteil für ein Funktelefonsystem,
das Informationssignale über einen zugeordneten Frequenzkanal
überträgt, wobei das Frequenzsyntheseteil ein Signal
auf der zugeordneten Frequenz erzeugt, gekennzeichnet
durch die Kombination des Frequenzsyntheseteiles und
eines Nur-Lese-Speichers (10), der eine Vielzahl von
Gruppen von ersten und zweiten Signalen, die mit verschiedenen
vorbestimmten zuordenbaren Frequenzen verbunden
sind, speichert, wobei das Frequenzsyntheseteil die
folgenden Merkmale aufweist:
einen ersten Phasenregelkreis (12) zum Erzeugen eines
Ausgangssignals auf einer Frequenz innerhalb eines ersten
vorbestimmten Bereichs, der die Vielzahl von zuordenbaren
Frequenzen einschlieÃx9ft, als Antwort auf die Kombination
eines ersten Frequenzbezugssignals, das eine vorbestimmte
Frequenz hat, und eines zweiten Frequenzbezugssignals,
das eine Frequenz innerhalb eines zweiten vorbestimmten
Bereiches hat und von einem zweiten Phasenregelkreis (14)
abgeleitet ist, wobei der erste Phasenregelkreis (12) ein
erstes BandpaÃx9ffilter (34) beinhaltet, das einen DurchlaÃx9fbereich
zum Verringern von Phasenrauschen und elektronischem
Rauschen infolge von Mikrophonie hat;
einen zweiten Phasenregelkreis (14) zum Erzeugen eines
dritten Frequenzbezugssignals innerhalb eines dritten vorbestimmten
Bereiches als Antwort auf eine Kombination eines
ersten Signals von dem Nur-Lese-Speicher (10), das mit
einer gegebenen zuordenbaren Frequenz verbunden ist, und
eines vierten Frequenzbezugssignals, das eine vorbestimmte
Frequenz hat, wobei der zweite Phasenregelkreis (14) ein
zweites BandpaÃx9ffilter (42) beinhaltet, das einen DurchlaÃx9fbereich
zum Verringern von Phasenrauschen und elektronischem
Rauschen infolge von Mikrophonie hat;
einen mit dem Nur-Lese-Speicher (10) gekoppelten Frequenzteiler
(16) zum Teilen der Frequenz des Ausgangssignals
des zweiten Phasenregelkreises (14) durch einen Betrag, der
durch ein zweites Signal von dem Nur-Lese-Speicher (10)
angegeben wird, das mit der gegebenen zuordenbaren Frequenz
verbunden ist, um das zweite Frequenzbezugssignal an den
ersten Phasenregelkreis (12) zu liefern.
2. Frequenzsyntheseteil nach Anspruch 1, dadurch gekennzeichnet,
daÃx9f der erste Phasenregelkreis (12) die
folgenden Merkmale aufweist:
einen ersten spannungsgesteuerten Oszillator (26) zum Erzeugen
des Ausgangssignals auf einer Frequenz innerhalb
des ersten vorbestimmten Bereiches, der die Vielzahl von
zuordenbaren Frequenzen einschlieÃx9ft;
einen Mischer (28) zum Mischen des Ausgangssignals von dem
ersten Oszillator (26) mit dem ersten Frequenzbezugssignal;
einen ersten Phasenvergleicher (32) zum Vergleichen eines
Produktes aus dem Mischer (28) mit dem zweiten Frequenzbezugssignal,
das eine Frequenz innerhalb des zweiten vorbestimmten
Bereiches hat und von dem zweiten Phasenregelkreis
(14) abgeleitet ist, und zum Erzeugen eines ersten
Spannungssignals, das das Ergebnis des Vergleichs anzeigt;
das erste BandpaÃx9ffilter (34) zum Durchlassen des ersten
Spannungssignals zu dem ersten Oszillator (26) zum Steuern
des ersten Oszillators (26),
und daÃx9f der zweite Phasenregelkreis (14) die folgenden
Merkmale aufweist:
einen zweiten spannungsgesteuerten Oszillator (36) zum
Erzeugen des dritten Frequenzbezugssignals innerhalb des
dritten vorbestimmten Bereiches,
einen ersten mit dem Nur-Lese-Speicher (10) gekoppelten
Frequenzteiler (16) zum Teilen der Frequenz des Ausgangssignals
aus dem zweiten Oszilltor (36) durch einen Betrag,
der durch ein erstes Signal aus dem Nur-Lese-Speicher (10)
angegeben wird, das mit einer gegebenen zuordenbaren Frequenz
verbunden ist,
einen zweiten Phasenvergleicher (40) zum Vergleichen des
geteilten Ausgangssignals aus dem zweiten Oszillator (36)
mit einem vierten Frequenzbezugssignal und zum Erzeugen
eines zweiten Spannungssignals, das das Ergebnis des Vergleichs
anzeigt,
das zweite BandpaÃx9ffilter (42) zum Durchlassen des zweiten
Spannungssignals zu dem zweiten Oszillator (36) für dessen Steuerung, und
ein mit dem Nur-Lese-Speicher (10) gekoppeltes zweites
Frequenzteil (38) zum Teilen der Frequenz des Ausgangssignals
aus dem zweiten Oszillator (36) durch einen Betrag,
der durch ein zweites Signal von dem Nur-Lese-Speicher (10)
angegeben wird, das mit der gegebenen zuordenbaren Frequenz
verbunden ist, um das zweite Frequenzbezugssignal
an den ersten Phasenvergleicher (32) zu liefern.
3. Frequenzsyntheseteil nach Anspruch 2, gekennzeichnet
durch ein TiefpaÃx9ffilter (30) zum Durchlassen des Niederfrequenzproduktes
des Mischers (28), wobei der erste
Phasenvergleicher (32) das durchgelassene Niederfrequenzprodukt
mit dem zweiten Frequenzbezugssignal vergleicht.
4. Frequenzsyntheseteil nach einem der vorhergehenden
Ansprüche, dadurch gekennzeichnet, daÃx9f der Nur-Lese-Speicher
(10) ein programmierbarer Nur-Lese-Speicher ist.']
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SUMMARY
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