JPS6281112A - Channel selection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a channel selection device suitable for a preview receiver or the like.

[Background of the invention]

The previous AT was the Consumers Union (CONS).
Consumer Report J (CONC0N5U REPORTS) published by CONC0N5U UNION.

As described on page 39 of the January 1984 issue, LAS
It is called T CHANNEL RECALL,
For example, it is possible to tune two sports programs consecutively and alternately tune back and forth between the two channels by performing a specific input operation.

However, when performing the above-mentioned specific input operation, the channels that can be selected alternately are the currently received channel and the channel that was received immediately before. channel→no signal channel→
If you select a channel with a broadcast signal,
No consideration was given to the fact that if the specific input operation was performed, a non-signal channel would be received.

[Purpose of the invention]

An object of the present invention is to eliminate the problems of the prior art, and when the specific input operation is performed in the channel selection device, the non-signal channel is not re-selected, and the "currently receiving channel" is selected. [Summary of the Invention] In order to achieve the above object, the present invention has been developed. In the present invention, the memory control circuit is controlled by a signal discrimination circuit for discriminating whether a received channel is a no signal or a broadcast signal, so that when a channel with no signal is selected, the data of the counter circuit is By storing the data of the counter circuit in the memory circuit only when a channel with a broadcast signal is selected without storing it in the memory circuit, the data of the counter circuit is stored in the memory circuit, so that when the specific input operation is performed, a channel with no signal This makes it possible to alternately tune back and forth between the channel currently being received and the channel with the broadcast signal that was received immediately before, without having to tune again.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A channel selection device will be described below as an embodiment of the present invention with reference to the drawings. The figure shows a block diagram of an embodiment of the channel selection device according to the present invention.

In the figure, 1 indicates 7M6's (LAST CHANNEL RECA) which performs a specific input operation.
(for performing LL operation) tuning button, 2 is tuning button 1
A human-powered encoder that detects the YANG and converts it into a control signal,
3 is a light receiving circuit for receiving a remote control signal using infrared rays or the like as a medium.

4 is a decoding circuit that converts the output of the light receiving circuit B into a control signal; 5 is a memory circuit 6 which is controlled by the control signal;
7 is a clock circuit that generates a clock pulse serving as a reference frequency; 8 is a counter circuit that performs counting for the clock circuit 7; 9 is a counter circuit controlled by the output of the memory control circuit 5; A counter control circuit for stopping the counting of the circuit 8, and a tuning voltage control circuit 10 for applying a tuning voltage corresponding to the receiving and receiving channels to the tuner based on the output of the counter circuit 8. Reference numeral 11 indicates a signal detection circuit for detecting the presence or absence of a broadcast signal.

Next, the operation of this embodiment will be explained.

In FIG. 1, when selecting a broadcast signal, the signal discrimination circuit 11
, the memory control circuit 5 is controlled and data of the counter circuit corresponding to the tuning voltage of the reception channel is written into the memory circuit 6. Next, when a no-signal channel is selected, the memory control circuit 5 is not driven because there is no output from the signal discrimination circuit 11, and the data of the counter circuit 8 corresponding to the tuning voltage of the no-signal channel is stored. Not done.

When a broadcast signal is selected next time, the data of the counter circuit 8 corresponding to the tuning voltage of the reception channel is stored in the memory circuit 6, as in the previous time.

Here, if a signal corresponding to the specific input operation sent from the channel selection button 1 or the remote control transmitter is received (i.e. LAST CHANNEL
RECALL operation), the older of the two data stored in the memory circuit (that is, the data corresponding to the tuning voltage of the channel of the first selected broadcast signal) is transferred to the memory control circuit 5. The counter control circuit 9 stops the counting of the counter circuit 8 when the data becomes the same as the data, and the tuning voltage control circuit 10 applies a tuning voltage corresponding to the channel. , you can receive the first tuned broadcast signal. At this time, the memory control circuit is controlled by the signal discrimination circuit 11, and the data of the counter circuit 8 corresponding to the tuning voltage of the channel is stored in the memory circuit 6. Next, when the specific input operation is performed using the channel selection button 1 or remote control operation, the second broadcast selected is received in the same manner.

Therefore, since the conventional device does not have the signal discrimination circuit 11, the data of the counter circuit 8 corresponding to the fJ', A'iFi pressure of the receiving channel is stored in the memory circuit 6 every time a channel is selected. Therefore, if there was no signal on the channel that was selected immediately before the channel that was currently being received, there was a drawback that if you performed the above-mentioned specific input operation, you would receive the no-signal channel. According to the present invention, as described above, by controlling the memory control circuit 5 by the signal discrimination circuit 11, the currently received channel and the channel with the broadcast signal received immediately before are alternately switched back and forth. It becomes possible to select a station.

〔Effect of the invention〕

As described above, according to the present invention, when there is a specific input operation as described above, it is possible to alternately select the channel that is currently being received and the channel that was received immediately before. With a channel selection device, it is possible to alternately select only channels with broadcast signals in a round trip [7].
This has the effect of making the channel selection operation easier.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an evacuated station device according to the present invention. 5...Memory control circuit 6...Memory circuit 7...
Clock circuit 8... Counter circuit 9... Counter control circuit 10... Tuning voltage control circuit 11... Signal discrimination circuit,

Claims (1)

[Claims] A counter circuit that counts clock pulses serving as a reference frequency, a counter control circuit that stops the counting of the counter circuit at a value corresponding to the receiving channel when tuning, and a tuning that is controlled by the output of the counter circuit and corresponds to the receiving channel. a tuned voltage control circuit that applies voltage to the tuner;
Consists of a memory control circuit for storing the output of the counter circuit in a memory circuit or reading it from the memory circuit when selecting a channel, and when a specific input operation is performed, the data of the memory circuit is read and the counting of the counter circuit is controlled. In a channel selection device that can alternately select the channel that was received immediately before the channel that is currently being received, a signal discrimination circuit is provided to determine whether the received channel is a no signal or a broadcast signal. By controlling the memory control circuit using the output of the signal discrimination circuit, when a channel with no signal is selected, the data of the counter circuit is not stored in the memory circuit, and a channel with a broadcast signal is selected. The data of the counter circuit is stored in the memory circuit only when the channel is switched, and when the specific input operation is performed, the channel of the currently received broadcast signal and the channel of the broadcast signal received immediately before switching channels are stored. A channel selection device characterized in that it is possible to select channels alternately.