JPS6134699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a band display method in an electronic tuner capable of receiving multiple bands, and the present invention relates to a band display method in an electronic tuner capable of receiving multiple bands, and the method is capable of determining a receiving band from a receiving frequency without inputting a band signal, and also determining the receiving frequency within the receiving band. An object of the present invention is to provide a band display method in an electronic tuner that can determine the position of a band and, based on the determination result, light up and display the corresponding location of a band display device having a plurality of indicators for each band. It is something.

The band display device is LW, MW, SW ₁ ~ _{SW 5} ,
One indicator was provided for each band such as FM, and by lighting one of these indicators, the band currently being received could be determined. However, if a digital display is used as a reception frequency display in an electronic tuner, etc., the frequency currently being received can be easily confirmed.
It is extremely difficult to intuitively identify the frequency position in a band.

In view of the above, the present invention provides an electronic tuner capable of receiving multiple bands, which has a band display device consisting of a plurality of indicators for each band, is provided with an input means for changing the receiving frequency, and is provided with an input means for changing the receiving frequency. Performing a band comparison process based on the changed receiving frequency to determine the band, and also dividing the band into a plurality of parts and determining which of the divisions the receiving frequency belongs to, thereby lighting up the band display device. , the band and the position within the band can be identified.

The present invention will be described below with reference to drawings of embodiments.

FIG. 1 is a block diagram for explaining the principle of the band display method of the electronic tuner of the present invention. In the figure, 1 has a plurality of indicators for each band,
The band display is composed of these indicators, for example, as shown in Figure 5, LW, MW,
It has eight bands SW ₁ , SW ₅ , and FM, and eight indicators L ₁ to _{L 8} are arranged to correspond to each of these many bands. 2 is a drive circuit which uses a band signal 9 and a scale signal 10 obtained by dividing the band into a plurality of parts as input signals and applies a lighting signal to the band display device 1; 3 is a frequency display whose input signal is a segment signal 11; 4
is a preset selection key for selecting a preset frequency; 5 is a tuning pulse generation circuit that outputs pulse signals 6 and 7 to raise or lower the reception frequency; 8 is the preset selection key 4 mentioned above.
and the pulse signals 6 and 7 from the tuning pulse generation circuit 5 are input, and the band signal 9, scale signal 10, and segment signal 1 are input to the drive circuit 2 and frequency display 3.
This is a control unit that controls the output of 1, and is made up of, for example, a microcomputer.

FIG. 2 is a block diagram showing the control section 8 in detail.
an output flip-flop circuit 12 having an output of
A gate and buffer circuit 22 which outputs the segment signal 11 of the frequency display 3, a preset selection key, an input flip-flop circuit 23 which receives pulse signals 6 and 7 for raising or lowering the receiving frequency, and a clock pulse. a generating circuit 13; an arithmetic unit 14 that performs calculations such as addition;
RAM1 that stores frequency, band, scale, etc.
5, a ROM 20 that stores a control program,
It has an address register 19 that controls the address of the RAM 15 and a program counter 21 that controls the address of the ROM 20. Also
The RAM 15 includes a frequency storage section 16 that stores the frequency currently being received, a preset storage section 17 that stores the preset frequency, and a band storage section 1 that stores data for comparing bands and scales.
8, and each storage unit 16, 17, 18 has 4
It has a storage area multiple times that of a bit. In other words, the frequency storage section 16 and preset storage section 17 of the RAM 15 are designed to store 6-digit frequencies in 4 bits, as shown in FIGS. As shown in Figure c, the basic value f _Bo , pitch f _po , upper limit frequency _H
o , lower limit frequency _Lo , band n, scale S,
Pulses A, B, and C are stored in 4 bits. As shown in Figure 3, the data for calculating bands and scales are the lower limit and upper limit frequencies of the band to identify the band, and the scale is calculated by dividing each band into pitch frequency intervals. Pitch to do, Pitch to K
Consists of basic values for converting to Hz unit, ROM20
It is memorized by a program stored in .

FIG. 4 is a flowchart representing the operation of the electronic tuner, and the operations of FIGS. 1 and 2 will be explained with reference to the flowchart of FIG. First, 0 is entered into the 1-bit storage area for pulse A and pulse B in the band storage section 18. Check the inputs of pulse inputs 6 and 7, compare pulses 6 and A, and pulses 7 and B. If they are the same, it is determined that there is no pulse input, and in process 31, check to see if there is any input to the preset selection key 4, and check if the input is correct. If not, the process returns to step 32 and the above steps are repeated. In process 32, if either pulse 6 and A or pulse 7 and B are different, it is determined that a pulse has been input, and the frequency change direction and the number of pulses are calculated from pulses 6, 7, A, and B, and the pulse The number is stored in area C of the band storage section 18. The frequency change direction and number of pulses are calculated by determining the up direction and down direction based on the difference in phase between pulses 6 and 7, as shown in Figure 7.
The number of pulses is calculated based on the rising and falling edges of pulses 6 and 7. If the frequency is up due to the frequency change direction, add the number of pulses in area C of the frequency storage section 16,
In the case of down, the number of pulses in area C of the frequency storage section 16 is subtracted to change the frequency storage section 16 by the number of pulses C. In processes 31 and 33, the input of the preset selection key 4 is checked, and if there is an input, the contents corresponding to the preset selection key 4 are transferred from the preset storage section 17 to the frequency storage section 16.

Since the contents of the frequency storage section 16 have been changed as described above, that is, the receiving frequency has been changed, the band and scale are calculated as follows. In other words,
The initial value -1 is set to area n of the band storage unit 18 and then 1 is added, and the band data corresponding to the contents of area n shown in FIG. 3 is transferred from the RM 20 to the band storage unit 18, and the frequency storage 16 contents F
1 is added to the area n and the comparison process is repeated until the lower limit value f _Lo ≦F and the upper limit value f _Ho ≦F are satisfied.
When the above conditions are satisfied, region n matches the frequency band of frequency storage section 16. Next, -1 is set as an initial value in the area S of the band storage section 18. 1 is added to the area S, and the band storage unit 18
and the content F of the frequency storage unit 16. 1 is added to the area S and the comparison process is repeated until the condition of _Lo +f _Bo +f _po ×(S+1)≧F is satisfied. When the above conditions are satisfied, the region S matches the frequency scale of the frequency storage section 16. After repeating this comparison process,
The contents of areas n and S of the frequency storage section 18 are output as a band signal 9 and a scale signal 10 by the output flip-flop circuit, and one corresponding display of the band display device 1 is turned on. Further, the contents of the frequency storage section 16 are outputted as a segment signal 11 from the gate and buffer circuit 22 and displayed on the frequency display 3. Then, a predetermined signal when the tuner is activated is output from the output flip-flop circuit 12, and the process returns to the beginning and repeats the above process.

Although the embodiment described above does not have a band switching input, it is of course possible to have a band switching input, and input signals such as pulse input, etc.
It is also possible to modify the control unit so that it can operate in the same way as the present invention.

As described above, the band display method of the present invention displays not only the frequency band currently being received, but also the approximate position within the band, making it extremely easy to locate the frequency in an electronic tuner that uses a digital frequency display. It has distinct advantages.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the electronic tuner of the present invention, FIG. 2 is a concrete block diagram of the main circuit of the tuner, FIG. 3 is an explanatory diagram of the operation of the main part, and FIGS. Fig. 5 is a block diagram of the band display device of the same device, Fig. 6 a, b, and c are bit structure diagrams of the storage section of the same device; Figures a and b are pulse timing diagrams of the same device. 1...Band display device, 3...Frequency display device,
4... Preset selection key, 5... Timing pulse generation circuit, 6, 7... Pulse signal, 8... Control section, 9... Band signal, 10... Scale signal.

Claims (1)

[Claims] 1. A band display device in which a plurality of indicators are arranged for each of a plurality of bands, a frequency display device that numerically displays the reception frequency, and a reception frequency changed by an input means for changing the reception frequency and a display corresponding to the band. The control means includes a control means for outputting a segment signal to the frequency display device, and the control means includes a storage section storing frequency information and band name information within the plurality of bands, and the control means includes a storage section that stores frequency information and band name information within the plurality of bands, and the control section outputs a segment signal to the frequency display device. By comparing the received frequencies changed by the input means, a band signal corresponding to the received frequency is output to the band display device, and each indicator in the band display device is scaled in accordance with the received frequency. A band display method in an electronic tuner characterized by being configured to output a signal.