JPS6119220A - Channel selecting device - Google Patents

Abstract

PURPOSE:To apply the titled device to a CATV with simple constitution by switching an area of a memory device in response to a signal from an auxiliary switch. CONSTITUTION:A signal from an IC1 is applied to a 3-contact auxiliary switch 10 and a signal from the contacts A-C of the switch 10 is fed back to the IC1 via LEDs LA-LC. When the switch 10 is selected, the area of the memory 2 is switched respectively to the A-C. When channel selection keys K1-K10 are depressed, data of a corresponding address in each area is read, and a band switching signal of H, L, U, CATV is formed in response to a tuner or data via a D/A converter 3 and fed to the tuner 4. Thus, the selective reception of an optional channel of the CATV is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a channel selection device used in a so-called CATV compatible television receiver.

Background technology and its problems TV reception 11j! For example, there is a device as shown in FIG. 2 as a channel selection device for a machine. In the figure, for example, ten channel selection keys 1 to 1o are provided, and a signal from the control IC (1) is transmitted through these keys Kl - Kto to IC (1
) will be returned. And the key K pressed in IC(1)
The address formed according to t~Kro is stored in the memory device (
2), and the data read from that address is supplied to the DA converter (3) through the IC (1).

As a result, a desired tuning voltage is generated by the DA converter (3) and supplied to the voltage-controlled tuner (4).

Also, from the above data, a high, low, and U'' band switching signal is formed, and this signal is supplied to the tuner (4)K.This allows reception of the radio broadcast television image supplied from the antenna (5). Also, a signal corresponding to the address being read out is supplied to the light emitting diodes L1 to LIG, and the address being used for tuning is displayed.

Furthermore, the key Kn-K14 is a key for memory presetting, and for example, by pressing the key Kn, the address that is being supplied to the channel selection at that time is set to the preset mode, and if the key Kxz or Kx3 is pressed in this state, Address data is increased or decreased by one channel. When the desired channel is received,
When the key 14 is pressed, the data at that time is fixed at the address.

In this way, the desired radio wave broadcast is received on television.

In Japan, the number of broadcasting stations that are broadcast over the airwaves is about 8 at most, including VHF and UHF in rural areas.
It was sufficient to have as many as 10 of the above-mentioned channel selection keys.

Incidentally, in recent years, so-called CATV broadcasting has been considered, and in this type of broadcasting, all established channels of 1° to 2° are to be broadcast.

In this case, it would be extremely inconvenient from a mechanical and design standpoint to provide as many as 20 to 30 tuning keys, including those for radio wave broadcasts, in a receiver that receives such broadcasts.

On the other hand, there is a method in which a so-called 1o key from ``0'' to ``9'' is provided, and 1. channel number is directly specified to select a channel, regardless of whether it is VHF, UkiF, or CATV.

In this case, the tuner (4) is of the so-called frequency synthesizer type, which changes the division ratio of the local oscillator depending on the number.

However, changing from a so-called voltage synthesizer type tuner that performs DA conversion to form a channel selection voltage as described above to a frequency synthesizer type tuner is extremely disadvantageous in terms of manufacturing cost. Also, when selecting a channel, requiring the user to perform three operations: ``10s digit'', ``1s digit'', and ``Enter'' is similar to the CAT system in the United States.
It can't be helped if you have to select from nearly 100 broadcasts on V, but in Japan, where there are at most 30 broadcasts to choose from, the operation was complicated and many people were dissatisfied.

Purpose of the Invention In view of these points, the present invention provides a CAT
This makes it possible to correspond to V.

Summary of the Invention The present invention provides a predetermined number of tuning keys, a control circuit to which signals from these tuning keys are supplied, and a memo.

It has an auxiliary device having a plurality of contacts, which reads data at the corresponding address of the memory device in response to a signal from the tuning key, converts the read data, and supplies it to the tuner. a switch is provided, a signal from the auxiliary switch is supplied to the control circuit;
The channel selection device is configured such that the area of the memory device is switched in response to a signal from the auxiliary switch, and according to this, it is possible to make it compatible with CATIC with a simple configuration.

Embodiment In FIG. 1, for example, a three-contact auxiliary switch fll is provided, a signal from I C' CI) is supplied to this switch 00, and each contact A,' of this switch (10) is
B.

The signals of C and L are respectively transmitted to the light emitting diodes LA and L.
B.

Returned to IC (1) through JJC. In addition, the valley shape of memo January 2) will be tripled compared to the conventional fallen tree. Further, the signal of the radio wave broadcast from the antenna (5) is supplied to the mixer (6), mixed with the CATV broadcast signal from the 2'-s cable ('7), and supplied to the tuner (4). Also i c
From (1)...i, low, "Ll", CA 'i'
A band switching signal of V is supplied to one tuner (4).

The rest shall be the same law as in Figure 2.

In this device, when the auxiliary switch OI is switched,
The areas of memory (2) are switched to A, B, and C, respectively. Then, when 1 to 1o is pressed on the selection key, the data of the corresponding address in each area is read out,
The signal is supplied to the tuner (4) through the DA converter (3). Also, high, low, "U", and CATV band switching signals are formed according to the data and are supplied to the tuner (4).

This makes it possible to select, for example, 30 channels, three times as many channels as in the past. Therefore, conventional VHF.

In addition to, for example, eight channels of UHF radio wave broadcasting, it is possible to select and receive, for example, twenty channels of CATV broadcasting.

In this way, it is possible to select, for example, 30 broadcast channels, but according to the above-mentioned device, by simply providing an auxiliary switch αQ, it is possible to select, for example, three times as many channels, with an extremely simple configuration. A finished tree. In addition, the user usually leaves the auxiliary switch (ul) fixed and presses the channel selection key from 1 to 1.
It is possible to receive the desired broadcast on the TV, and the operability is very good.

Furthermore, as shown in FIG. 3, the auxiliary switch (10) may be provided in the vicinity of the channel selection keys 1 to +o (this will not pose any mechanical or design problems).

Effects of the Invention I4 According to the present invention, it has become possible to make the system compatible with CATV with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of the present invention, FIG. 2 is a block diagram of a conventional device, and FIG. 3 is a diagram for explaining the present invention. Kt to KIO are the tuning keys, (1 is the control IC, (2) is the memory, (3) is the DA converter, (4) is the tuner, (5) is the
) is the antenna, (6) is the mixer, (power is the cable, QO
) is an auxiliary switch. Figure 1

Claims (1)

[Claims] It has a predetermined number of tuning keys, a control circuit to which signals from these tuning keys are supplied, and a memory device, and reads data at a corresponding address of the memory device in response to a signal from the tuning keys. In addition to converting the read data into DA and supplying it to the tuner, an auxiliary switch having a plurality of contacts is provided, and a signal from the auxiliary switch is supplied to the control circuit, and the signal from the auxiliary switch is supplied to the tuner. A channel selection device in which an area of the memory device is switched according to the timing.