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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Claim
1. Taajuussyntesointilaite radiopuhelinjärjestelmässä, joka välittää informaatiosignaaleja nimetyn taa-5 juuskanavan kautta, laitteen käsittäessä yhdistelmän, joka muodostuu syntetisaattorista signaalien kehittämiseksi nimetyllä taajuudella ja lukumuistista (10) erilaisiin, ennalta määrättyihin nimettävissä oleviin taajuuksiin liittyvien ensimmäisten ja toisten signaalien useiden ryhmien 10 tallentamiseksi, tunnettu siitä, että syntetisaattori käsittää a) ensimmäisen vaihelukitun silmukan (12), joka sisältää ensimmäisen jänniteohjatun oskillaattorin (26) 15 ulostulosignaalin kehittämiseksi taajuudella, joka on ensimmäisellä ennalta määrätyllä taajuusalueella, joka sisältää mainitut nimettävissä olevat taajuudet, sekoittimen (28) ensimmäisen jänniteohjatun oskillaattorin (26) ulostulosignaalin sekoittamiseksi ensimmäi-20 seen taajuusvertailusignaaliin; ensimmäisen vaihevertailijän (32) sekoittimelta (28) saatavan tuloksen vertaamiseksi toiseen vertailutaa-juussignaaliin, jolla on taajuus toisella ennalta määrätyllä alueella ja joka signaali on johdettu toisesta vai-25 helukitusta silmukasta (14), ja mainitun vertailun tuloksen ilmoittavan ensimmäisen jännitesignaalin muodostamiseksi; ja ensimmäisen kaistanpäästösuodattimen (34) ensimmäisen jännitesignaalin päästämiseksi ensimmäiselle jännite-30 ohjatulle oskillaattorille (26) ensimmäisen jänniteohjatun oskillaattorin ohjaamiseksi, jolloin ensimmäisen kaistanpäästösuodattimen päästökaista on sovitettu minimoimaan mikrofonisista ilmiöistä johtuva vaihekohina ja elektroninen kohina; 35 b) toisen vaihelukitun silmukan (14), joka sisältää 9 90608 toisen jänniteohjatun oskillaattorin (36) kolmannen vertailutaajuussignaalin kehittämiseksi, joka on kolmannella ennalta määrätyllä alueella; ensimmäisen taajuusjakajan (16), joka on kytketty , 5 mainittuun lukumuistiin (10) toiselta jänniteohjatulta os killaattorilta (36) saatavan ulostulosignaalin taajuuden jakamiseksi määrällä, jonka ilmoittaa lukumuistilta (10) saatava ensimmäinen signaali, joka liittyy tiettyyn nimettävissä olevaan taajuuteen; 10 toisen vaihevertailijän (40) toiselta jänniteohja tulta oskillaattorilta (36) saatavan jaetun ulostulosignaalin vertaamiseksi neljänteen taajuusvertailusignaaliin ja toisen jännitesignaalin (joka ilmoittaa mainitun vertailun tuloksen) muodostamiseksi; ja 15 toisen kaistanpäästösuodattimen (42) toisen jänni tesignaalin päästämiseksi toiselle jänniteohjatulle oskillaattorille (36) toisen jänniteohjatun oskillaattorin ohjaamiseksi, jolloin toisen kaistanpäästösuodattimen (42) päästökaista on sovitettu minimoimaan mikrofonisista il-20 miöistä johtuva vaihekohina ja elektroninen kohina; ja c) toisen taajuusjakajan (38), joka on kytketty mainittuun lukumuistiin (10) toiselta jänniteohjatulta oskillaattorilta (36) saatavan ulostulosignaalin taajuuden jakamiseksi määrällä, jonka ilmoittaa lukumuistista saata-25 va toinen signaali, joka liittyy mainittuun tiettyyn nimettävissä olevaan taajuuteen, mainitun toisen vertailutaajuussignaalin muodostamiseksi ensimmäiselle vaihevertaili jalle.
2. Patenttivaatimuksen 1 mukainen laite, t u n -30 n e t t u siitä, että lukumuisti (10) on ohjelmoitava lukumuisti (PROM). 10 906.Îx8a8']
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