JPH01126083A - Voice selection circuit - Google Patents

Abstract

PURPOSE:To enable the contents of a displayed program to be precisely recognized by selecting an optional still image among the still images dividedly displayed and monitoring the voice of it. CONSTITUTION:9 channels are switched and selected at every fixed period, the one field of the video signal of each channel is stored in each corresponding area of a field memory 13 and the video information of the 9 channels is reduced-displayed on a television display screen as the still image together with a channel number. The IF signal of the channel corresponding to the optional still image among the still images of the 9 channels dividedly displayed is led out from a second tuner 25 and a voice signal is formed and led out from this IF signal through a second SIF amplifier 26, a second detection circuit 27, a second amplifer 28 and a second voice mute circuit 29.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an audio selection circuit employed in a split display system that displays videos of a plurality of channels on the same screen.

(b) Conventional technology Regarding the technology of dividing and displaying video signals of multiple channels on a television screen, for example, see pages 19 to 23 of the August 1985 issue of the magazine "Television Technology" published by Denshi Gijutsu Publishing Co., Ltd. has been disclosed.

This conventional technology changes the channel selection position of the television receiver every second, samples one field of the video signal obtained each time the position is changed, and samples 1 field of the video signal obtained every time the position is changed.
Nine channels of still images are sequentially stored in area '9 and displayed on a monitor screen, and each screen is updated at a 9-second cycle.

(1) Problems to be Solved by the Invention However, in the prior art described above, each side is switched only every 9 seconds, and it is almost difficult to understand the program from a specific still image. Therefore, it is conceivable to switch the audio of each selected channel along with the video every second and monitor it, but it is also difficult to grasp the content from one second of audio.

Therefore, it becomes necessary to selectively monitor the audio of the specified positive channel.

B.) Means for Solving the Problems The present invention provides a system that samples a plurality of channels and displays a still image dividedly. When tuned, an audio processing circuit is provided for forming and deriving an audio signal from the output of the second tuner.

(B) Operation Therefore, according to the invention, the IF multiplied signal of the channel corresponding to any still image among the plurality of still images to be divided and displayed is derived from the second tuner, and the audio processing circuit derives the IF multiplied signal from the second tuner. A signal is formed and derived.

(f) Example The present invention will be described below according to an illustrative embodiment.

In this embodiment, nine channels are switched and selected at regular intervals, one field of video signals of each channel is stored in each corresponding area of the field memory, and the video information of nine channels is displayed on the TV screen together with the channel number. The present invention is applied to a video tape recorder that displays still images in a reduced size and updates each still image at a constant cycle.

The nine-screen split display function described above will be explained below with reference to the circuit block diagram shown in FIG.

First, the split display mode setting means (1) is operated to activate the position changing means (2). The position changing means (2) inputs preset nine channel positional data to the first channel selection circuit (3) and the channel sign generating means (4). The first channel selection circuit (3) is 9
While switching the tuning voltage corresponding to the position every second, the first audio mute circuit 6 is continuously operated at the same time as being input to the first tuner (5). Also,
The channel code generation circuit (4) inputs a sign pattern signal such as a channel number, station name, etc. set in advance in correspondence with the position to the channel multiplexing circuit (7) in correspondence with the channel position data. The IF multiplied signal selected by the first tuner (5) is input to the first SIF amplifier (151) and the video detection circuit (6).The first SI
After being detected by the first detection circuit 0e, the output of the F amplifier 4 is inputted to the first mute circuit αa in an operating state via the first amplifier αη. On the other hand, the IF signal is a video detection circuit (6)
After the signal is detected, the signal is input to the channel multiplexing circuit (7). This channel multiplexing circuit (7) multiplexes a sign pattern signal onto a video signal to form a multiplexed signal capable of displaying a channel sign at a predetermined position on a monitor screen.

This multiplexed signal is sent to the synchronization processing circuit (9) and the video processing circuit (
8) The input also fluctuates. The synchronization processing circuit (9) separates and derives the vertical synchronization signal and the horizontal synchronization signal from memory division (B-Y) No. 1. Multiplexer α
0) samples these 6 series signals at a rate of 1 field per second, and Y, (R
-Y), Y, (B-Y), Y, . . . are input to the AD conversion circuit via one signal path.

The AD conversion circuit performs AD conversion on the sampling output, and the AD conversion data is stored at a predetermined address of the field memory αJ specified by the memory control circuit α1). Therefore, the field memory α3 sequentially stores AD conversion data compressed to 1/9 for nine screens in each area.

This storage is performed cyclically during the split display mode setting period. The AD converted data read from the field memory by the memory control circuit αυ is converted into analog data in the DAAD conversion circuit, and converted into an NTSC color video signal in the video signal forming circuit (2). On a monitor TV to which this NTSC color video signal is input, still images of each channel are displayed on nine split screens, together with channel signs, as shown in FIG. Each still image is updated one screen at a time every second, and all screens are updated in nine seconds.

The configuration described above is a configuration for exhibiting the same function as the prior art described above, and is not a special configuration.

This embodiment is characterized by the following points.

First, this embodiment is provided with a position specifying means (2) consisting of push buttons arranged in 6 rows and 3 columns corresponding to the split screen, and when an arbitrary push button is operated, the position detection means (incorporated) forms and derives position data. Then, the switch control means is operated to switch the selector switch 09 to the second audio mute circuit side. The position data is compared with the position data of the position changing means (2) in the comparing means, and the matching output is sent to the channel sign generating means (4).
) is input. This channel sign generation means (4)
changes the phase of the modulated color signal when a coincidence output occurs.

Therefore, the color of the channel sign at the position corresponding to the operated push button on the monitor screen is changed. The position data generated by the positive position detection means (2D) is input to the first tuning circuit (3), which has the same configuration as the first tuning circuit (3).This second tuning circuit is muted only when the tuning voltage is generated. The signal is input to the second audio mute circuit ■ to prevent noise generated at the start of tuning from passing through.The second tuner (5) to which the tuning voltage is applied is connected to the channel corresponding to the generated position data. The 28th IF amplifier separates and amplifies only the audio IF signal and inputs it to the second detection circuit.The audio signal obtained by this detection is
The signal is outputted via the second audio mute circuit (branch) and the changeover switch α9, and is supplied to the television receiver (TV).

Therefore, the speakers of the television receiver (TV) output the sounds of channels whose channel signs on the monitor screen have different colors.

The audio channel can be changed by arbitrarily operating the push button of the position specifying means (2).

In order to monitor the video corresponding to the selected audio channel, it is sufficient to operate the split display mode canceling circuit C31) which has a reverse relationship to the split display mode setting means (1). When this split display mode release means (31) is operated,
The split display mode setting means (1) is canceled and the position changing means (2) becomes inactive. At the same time, the Posisilane data switching circuit diagram changes to the switching state and Posisilane detection means c! ]
As a result of inputting the position data issued by J to the first channel selection circuit (3), a video signal of a video channel matching the audio channel is derived from the video detection circuit (6). The display switching circuit (2), which has been switched to the switching state by the output of the split display mode canceling means C31), inputs the video signal obtained from the video detection circuit (6) to the television receiver (TV). The switching control means (2), which is reset by the output of the simultaneous number and split display mode release means (r31), returns the selector switch σ9 and inputs the video signal related to the channel selection of the first tuner (5) to the television receiver (TV). urge

(g) According to the present invention, since it is possible to select any still image from among the still images that are split and displayed and to monitor its audio, the content of the displayed program can be properly adjusted. It can be understood and the effect is great.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG.
The figures each reveal an explanatory diagram schematically showing a display screen. (3)...first tuner, 3)...second tuner,
(TV door: television receiver.

Claims (1)

[Claims] (1) Change the tuning voltage for the first tuner at regular intervals, sample one field or one frame of the obtained video signal, and sequentially store it in a predetermined storage area of the memory, while at the same time continuously storing the stored video signal. In a split display system that divides and displays a plurality of still images on a monitor screen while reading them out, the second tuner inputs a unique tuning voltage selected corresponding to the still image; and an audio processing circuit that outputs an audio signal obtained by separating and detecting the SIF signal from the obtained IF signal.