Radio receiver with selective plural band reception
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorToshihisa Funabashi
Life of this patent
Estimating the term…
Abstract
A radio receiver consisting of a radio receiver circuit capable of the reception of one band such as the AM band and one or more adapters capable of the reception of other bands such as the FM band, the radio receiver circuit and the adapter housed in the same cabinet. Each adapter includes components such as a tuner, a detector and so on required for the reception of a desired band, and the output from a radio oscillator in the radio receiver circuit is converted into a voltage signal in response to which the tuning is carried out in the adapter. The number of reception bands may be increased in a simple manner depending upon the demand of the listener, and various operation control means such as a preset mechanism, a volume control and so on may be used in common among various adapters.
Claims4
A radio receiver for providing AM reception and capable of accommodating an FM adapter, said adapter comprising a modular unit having (i) first and second sets of changeover contacts adjacent a surface thereof, (ii) an FM frequency scale, (iii) a frequency to voltage converter having an input terminal coupled to a contact of said first set, (iv) a voltage controllable electronic FM tuner having an input terminal coupled to an output terminal of said converter and controlled thereby, (v) means for coupling an input terminal of said tuner to an antenna terminal of said receiver, (vi) an FM detector having an input terminal coupled to an output terminal of said tuner, and (vii) means for coupling an output terminal of said detector to a contact of said second set, said receiver comprising:
- a cabinet;
- an AM radio receiver circuit disposed within said cabinet, said circuit comprising:
- a manually operable tuning control;
- an AM variable frequency oscillator coupled to said control and operated thereby;
- an AM antenna terminal;
- a mixer coupled to said AM antenna terminal;
- a terminal board having third and fourth contacts coupled to an output terminal of said oscillator and an input terminal of mixer respectively;
- Am amplification and detection means coupled to an output terminal of said mixer;
- a speaker;
- fifth and sixth contacts on said terminal board coupled to an output terminal of said AM amplification and detection means and to said speaker respectively;
- said cabinet having a space therein for accommodating said FM adapter in a selectively removable manner so that when said adapter is installed therein (A) the first set of contacts of said adapter engages the third and fourth contacts of said terminal board to couple the output terminal of said AM oscillator to the input terminal of said converter to vary the frequency of said FM tuner in response to operation of said tuning control, and (B) the second set of contacts of said adapter engages the fifth and sixth contacts of said terminal board to couple the output terminal of said FM detector to said speaker,
- said adapter further including switch means for interconnecting said (i) third and fourth and (ii) fifth and sixth contacts respectively when AM radio operation is desired, said space also being capable of accommodating a member for interconnecting said (i) third and fourth and (ii) fifth and sixth contacts respectively when said adapter is absent and AM radio operation is desired.
A radio receiver comprising:
- a cabinet containing a radio receiver circuit capable of receiving a first band of frequencies and including a tunable oscillator and a speaker;
- a series of contacts coupled to said receiver for coupling said oscillator and speaker to an adapter capable of receiving a second band of frequencies,
- said adapter having frequency sensitive tuning means and a detection circuit;
- said cabinet having means for accommodating said adapter in selectively removable fashion such that, when said adapter is installed, said tuning means is coupled to said oscillator via one or more of said contacts and controlled thereby, and said detection circuit is coupled to said speaker via one or more of said contacts.
A radio receiver, comprising:
- a cabinet containing AM radio receiver circuit elements comprising an antenna, an AM oscillator, a mixer an AM detector connected to said mixer, an audio frequency amplifier and a speaker connected to said amplifier, said circuit elements having a first terminal connected to said antenna and said mixer, a second terminal connected between an output terminal of said AM oscillator, a third terminal connected to a local oscillator signal input terminal of said mixer, a fourth terminal connected to an output of said AM detector, and a fifth terminal connected to an input terminal of said audio frequency amplifier, whereby said AM radio receiver circuit elements may be used as an AM radio by connecting thereto a terminal adapter having a first short-circuiting means for short-circuiting between said second and third terminals and a second short-circuiting means for short-circuiting between said fourth and fifth terminals, or may be used as an FM radio by connecting an FM monaural converter thereto, comprising AM-FM changeover means connected between said second and third terminals and said fourth and fifth terminals, a first converter, an electronic FM tuner and an FM detector coupled to said FM tuner whereby said converter is coupled to said AM oscillator for providing a tuning signal for said FM tuner and said FM detector is coupled to said fifthe terminal.
Dependencies are inferred from the claim text.