JPS6058606B2 - multi band receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-band receiver in which the local oscillator circuit is configured with a PLL synthesizer and can receive the station that was previously received when switching bands. This method is characterized in that the sweep is performed from the edge frequency of the band.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a normal PLL circuit, 2 and 3 are voltage controlled oscillators for AM and FM, and the oscillation frequency is f.

, fo' are added to the mixing circuits 4 and 5 as local oscillation frequencies. 6 is a sweep counter connected in parallel to the programmable frequency divider 7 constituting the PLL circuit 1, and changes the division ratio of the programmable frequency divider 7 by counting the sweep pulses from the sweep pulse generator 8. - Consists of a down counter.

Reference numeral 9 denotes a storage device generally composed of RAM (Random Access Memory) that stores the value of the sweep counter 6. As shown in the figure, it stores the previously received AM broadcast data at address A, and the FM broadcast data. It is assumed that the memory is composed of an address B for storing preset data, and addresses CG for storing preset data.

10 is the lowest receiving frequency data (Fmin) of the receiving band
11 is a gate circuit for switching the outputs of the RAM 9 and ROMIO.

±I inputs the signals of the FM band key 13, AM band key 14 and memory key 15, and the sweep counter 6
, RAM9, ROMIO, and gate circuit 11. A signal from the FM band key 13 is applied to the write signal terminal W1 of AM address A of R, AM9, and a signal from the FM band key 13 is applied to the address signal terminal ADl via the 0R gate 16. The signal of the FM band key 13 and the signal of the AM band key 14 which have passed through the delay circuit 17 are added to control writing and reading into and from the RAM 9. Also R, AM9 F
A signal of AMI<nd key 14 is applied to the write signal terminal W2 of address M address B, and a 0 signal is applied to the address signal terminal AD2.
The signal of the AM band key 14 and the signal of the FM band key 13 which have passed through the delay circuit 19 are added via the R gate 18. Then, the signal of the memory key 15 is applied to the write signal terminals W3 to W7 at the preset address C-G.
Each preset key P is connected to address signal terminals AD3 to AD7.
Signals 1 to P5 are added. 20, 21 is before &?
In the AND gate that controls 0M10, the signal of memory key 15 is applied to one input, and the FM signal is applied to the other input.
The signal that has passed through the delay circuit 19 of the band key 13 and the signal that has passed through the delay circuit 17 of the AM band key 14 are added, and the band key 1 is in the memory state where the memory key 15 is operated.
When 3 and 14 are operated, the lowest receiving frequency Fmln corresponding to the selected receiving band is output from the ROMIO. 22 is the AND gate 20, 2
1 is an input, and the output is an 0R gate connected to the gate circuit 1. The gate circuit 11, which is normally switched to the RAM 9 side, is connected to the ROM1O by generating the output of the 0R gate 22.
It acts to switch to the side.

23 is an 0R gate which inputs the outputs of the delay circuits 17 and 19 and whose output is connected to the preset enable terminal PE of the sweep counter 6. When not in the memory state, when selecting a band and when reading a preset, the data in the RAM 9 is sent to the sweep counter. 6, and when band selection is performed in the memory state, the lowest received frequency data Fmin from the ROMIO is preset in the sweep counter 6.

Next, the operation of the present invention with such a configuration will be explained.

First, a normal channel selection state in which the memory key 15 is not operated will be described.

At this time, since the gate circuit 11 has been switched to the RAM 9 side,
The configuration is such that the data in the RAM 9 is preset to the sweep counter 6 by key operation. Therefore, for example, suppose that AM (7) 1000KHZ broadcast is currently being received.
When the FM band key 13 is operated, a write signal W1 and an address signal ADl are generated, and 1000 KHz data is stored in address M of the RAM 9. Then, by the output of the delay circuit 19 that occurs thereafter, the FM address B is selected and the contents of the FM address B are preset in the sweep counter 6. For example, if 80.0 MHz data is entered at FM address B, the 80.0 MHz station will be received. If you want to receive broadcasts on other frequencies, you can operate the sweep pulse generation circuit 8 using the start key 24 and change the value of the sweep force counter 6. When the AM band key is operated in an attempt to receive an AM broadcast, a write signal W2 and an FM address signal AD2 are generated, and the data of 82 Meishu Se is stored in FM address B. The AM address A is selected by the output of the delay circuit 17 that occurs thereafter, and the data of the AM address AlOOOKHz is preset in the sweep counter 6.

Thus, the M 100 received before switching to FM
Stations at 0 KHz can be received again. Thereafter, in the same manner, each time a band is selected, the station that was previously received can be received. Further, at the time of preset tuning, the data of the address selected by selecting the preset keys P1 to P5 is read out to the sweep counter 6, and the preset tuning is performed. Next, the memory state when the memory key 15 is operated will be explained.

If band switching is performed at this time, AM
Alternatively, the broadcast data that was being received by band switching is stored in FM addresses A and B, and this time the AND gate 20
, 21 are opened by band selection, 0R gate 2
2 switches the gate circuit 11 to the ROM1O side, and the lowest reception frequency Fmin of the band selected from the ROM1O is preset in the sweep counter 6. Then, set the sweep counter 6 to the up counter, start sweeping from the lowest received frequency Fmin to the highest received frequency, and press any preset key at the desired station to select the memory key at preset address C-G. 15
It is in a writable state by the signal , and the broadcast data is preset to the specified address in the RAM 9. In this way, in the case of the embodiment, up to five stations can be preset. When the memory key 15, which has been preset, is returned to its original state, the channel selection operation is performed as described above.
In the embodiment, the lowest receiving frequency is set in the ROMIO, but the present invention is not limited to this, and the highest receiving frequency may be set and the sweep counter 6 may be set as a down counter.

As described above, the multiband receiver of the present invention is configured to preset the edge frequency of the receiving band in the sweep counter and start sweeping from that value when band switching is performed in the memory state. Therefore, when writing a preset, a broadcasting station can be searched from the end of the receiving band, which makes the preset operation very simple and has an extremely large practical effect.

[Brief explanation of the drawing]

The drawing is a diagram showing the configuration of a multiband receiver according to the present invention.

Claims (1)

[Scope of Claims] 1. In a multi-band receiver in which the local oscillation circuit is composed of a PLL synthesizer and the frequency division ratio of a programmable frequency divider constituting the PLL is varied to select a station,
storage means for storing a value of a frequency division ratio setting means for setting a frequency division ratio of a programmable frequency divider constituting the PLL; a setting means in which an edge frequency of a reception band is set; and a memory writing state of the storage means. The memory key to be set to
A reception band key and a detection means for detecting a coincidence of operations of the reception band key and the memory key are provided, and based on the output of the detection means, the edge frequency of the reception band operated by the storage means is determined by the frequency division ratio. What is claimed is: 1. A multi-band receiver, characterized in that it is configured to set in a setting means, start sweeping from an edge frequency, and preset a desired station. 2. In a multi-band receiver in which the local oscillator circuit is composed of a PLL synthesizer and the frequency division ratio of the programmable frequency divider constituting the PLL is varied to select a station,
storage means for storing a value of a frequency division ratio setting means for setting a frequency division ratio of a programmable frequency divider constituting the PLL; a setting means in which an edge frequency of a reception band is set; and a memory writing state of the storage means. The memory key to be set to
A reception band key and a detection means for detecting a coincidence of operations of the reception band key and the memory key are provided, and when the reception band key is operated, the value of the frequency division ratio setting means at that time is first written to a predetermined location of the storage means. When the memory key is not operated, the stored data of the selected reception band is read from the storage means to the division ratio setting means, and when the memory key is operated, the reception data is read out based on the output of the detection means. A multi-band receiver, characterized in that the end frequency of a receiving band is read out from the setting means to the division ratio setting means by operating a band key.