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1. (WO1979000937) INTERMEDIATE FREQUENCY SENSING CIRCUIT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000937 International Application No.: PCT/JP1979/000083
Publication Date: 15.11.1979 International Filing Date: 04.04.1979
IPC:
H03J 7/18 (2006.01)
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
J
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
7
Automatic frequency control; Automatic scanning over a band of frequencies
18
Automatic scanning over a band of frequencies
Applicants:
Inventors:
Priority Data:
78/4514917.04.1978JP
Title (EN) INTERMEDIATE FREQUENCY SENSING CIRCUIT
(FR) CIRCUIT CAPTEUR DE FREQUENCES INTERMEDIAIRES
Abstract:
(EN) An intermediate frequency sensing circuit for a superheterodyne radio receiver, including a logic circuit (30) to which a signal (Eo) indicating the intermediate frequency output level and a signal (Em) indicating the high frequency output level are applied so that the logic circuit may produce a signal (D1) expressing the existence of broadcast waves received when the intermediate frequency signal output is larger while the high frequency signal output is smaller. This circuit can avoid a malfunction caused by spurious signals and also enables the pulse within the sensed signal to be nearly constant. Thus, this circuit may be applicable to an automatic tuning system and the like.
(FR) Un circuit capteur de frequences intermediaires pour un recepteur radio superheterodyne, comprenant un circuit logique (30) sur lequel sont appliques un signal (Eo) d"indication du niveau de sortie des frequences intermediaires et un signal (Em) d"indication du niveau de sortie des hautes frequences pour que le circuit logique puisse produire un signal (D1) exprimant l"existence d"ondes de radiodiffusion recues quand la sortie du signal de frequence intermediaire est plus grande tandis que la sortie du signal de haute frequence est plus petite. Ce circuit permet d"eviter un mauvais fonctionnement du aux signaux parasites et de maintenir presque constante l"impulsion dans le signal capte. Ainsi, ce circuit peut s"appliquer a un systeme de syntonisation automatique et autres systemes semblables.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
US4403349