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 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 2G | 07/04/2004 | ISLD-200407-005 | INTERDIGITAL INC | No | Family Member | ||||
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Specification Information
Specification Information
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Technologies
Multiple access
Product
Use Cases
Services
Claim
1. Frequenzsynthesizereinheit für ein Funktelefonsystem zur Ãx9cbertragung
von Informationssignalen über einen zugeordneten Frequenzkanal
wobei die Frequenzsynthesizereinheit den SynthesiÂxad
zer zur Erzeugung eines Signals auf der zugeordneten Frequenz und
einen Nur-Lese-Speicher (ROM) umfaÃx9ft, der eine Vielzahl von
Gruppen erster und zweiter Signale, die mit verschiedenen vorbeÂxad
stimmten zuordenbaren Frequenzen verbunden sind, speichert, wobei
der Synthesizer umfaÃx9ft:
einen ersten Phasenregelkreis (12) (PLL), umfassend:
einen ersten spannungsgesteuerten Oszillator (26) (VCO) zur
Erzeugung eines Ausgangssignals auf einer Frequenz innerhalb
eines ersten vorbestimmten Bereichs, der die Vielzahl von zuÂxad
ordenbaren Frequenzen umfaÃx9ft;
einen Mischer (28) zur Mischung des Ausgangssignals des ersten
VCO (26) mit einem ersten Referenzfrequenzsignal;
einen ersten Phasenvergleicher (32) zum Vergleich eines ProÂxad
dukts von dem Mischer mit einem zweiten ReferenzfrequenzsiÂxad
gnal, das eine Frequenz aufweist, die innerhalb eines zweiten
vorbestimmten Bereichs liegt und von einem zweiten PhasenreÂxad
gelkreis (14) abgeleitet ist, und zur Bereitstellung eines ersten
Spannungssignals, das das Ergebnis dieses Vergleiches anzeigt;
und
einen ersten aktiven BandpaÃx9ffilter (34) zum Durchleiten des
ersten Spannungssignals zu dem ersten VCO (26) zur Steuerung
des ersten VCO (26), wobei der DurchlaÃx9fbereich des ersten
BandpaÃx9ffilters (34) eine groÃx9fe Bandbreite zur Verringerung von
Phasenrauschen und elektronischem Rauschen in Folge von
Mikrofonie aufweist;
einen zweiten Phasenregelkreis (14), umfassend:
einen zweiten VCO (36) zur Erzeugung eines dritten ReferenzsiÂxad
gnals innerhalb eines dritten vorbestimmten Bereichs;
einen ersten Frequenzteiler (38), der mit dem ROM verbunden
ist zur Teilung der Frequenz des Ausgangssignals von dem
zweiten VCO (36) um einen Betrag, der durch ein erstes Signal
von dem ROM (10) angezeigt wird, mit dem eine gegebene
zuordenbare Frequenz verknüpft ist;
einen zweiten Phasenvergleicher (40) zum Vergleichen des geÂxad
teilten Ausgangssignals von dem zweiten VCO (36) mit einem
vierten Referenzfrequenzsignal und zum Bereitstellen eines
zweiten Spannungssignals, das das Ergebnis dieses Vergleichs
anzeigt; und
einen zweiten aktiven BandpaÃx9ffilter (42) zum Durchleiten des
zweiten Spannungssignals zum zweiten VCO (36) zur Steuerung
des zweiten VCO (36) bei dem der DurchlaÃx9fbereich des zweiÂxad
ten BandpaÃx9ffilters eine groÃx9fe Bandbreite zur Verringerung von
Phasenrauschen und elektronischem Rauschen infolge von MikroÂxad
phonie aufweist; und
einen zweiten Frequenzteiler (16) der mit dem ROM (10)
verbunden ist zur Teilung der Frequenz des Ausgangssignals
vom zweiten VCO (36) um einen Betrag, der durch ein zweites
Signal von dem ROM (10) angezeigt wird, mit dem die gegebeÂxad
ne zuordenbare Frequenz verknüpft ist, um das zweite RefeÂxad
renzfrequenzsignal dem ersten Phasenvergleicher (32) zur VerÂxad
fügung zu stellen.
2. Frequenzsynthesizereinheit nach Anspruch 1, bei der das ROM (10) ein programÂxad
mierbarer Nur-Lese-Speicher (PROM) ist.']
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