JP2535828B2 - Signal transmission device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a signal transmission device suitable for use when transmitting a video signal as digital data.

[Outline of Invention]

According to the present invention, in a signal transmission device for transmitting a video signal as digital data, a plurality of synchronizing signals are binarized and added to the data of the video signal as 1-bit serial data to be transmitted. Is intended to be simplified.

[Conventional technology]

An example of dubbing between VTRs as a conventional signal transmission device will be described with reference to FIG. In FIG. 3, (1) is a reproducing VTR, and (2) is a recording VTR. The video signal from the reproducing VTR (1) is internally converted into, for example, 8-bit parallel digital data, and the recorded VT is used.
It is supplied to the digital comparator (3) in R (2). A clock signal (CK) is supplied from the reproducing VTR (1) to the digital comparator (3) and the encoder (4).

The digital comparator (3) compares the input data with a reference pedestal level, and if the data on the low level side of the pedestal level is a predetermined width or more, it is regarded as a synchronization signal (SYNC), and after a predetermined time from the synchronization signal. Consider a certain waveform as a color burst signal (BURST). The sync signal and the color burst signal are supplied to the line / field detection circuit (5) of the encoder (4), which detects the field number from the phase relationship between the vertical sync signal and the color burst signal, and the vertical sync signal and the horizontal sync signal. The line number is detected from the relationship. Then, in the encoder (4), the data is rearranged based on the line and field information, signal processing such as adding parity is performed, and the recording amplifier (6)
And recording on the magnetic tape (8) via the recording head (7).

[Problems to be solved by the invention]

By the way, in the case of the conventional apparatus as shown in FIG. 3, the data is processed in the digital comparator (3) of the recording VTR (2) on the receiving side to extract the synchronizing signal and the color burst signal. Digital comparator (3)
However, there is a defect that the circuit configuration of is complicated.

The present invention has been made in view of the above circumstances, and provides a signal transmission device capable of simplifying the circuit configuration on the receiving side.

[Means for solving problems]

The present invention is a signal transmission apparatus for adding a sync signal of a video signal and a color burst signal to a digital video signal obtained by digitizing a video signal, and transmitting the sync signal and the color burst signal of the video signal. Valuation,
Serial data forming means for forming 1-bit serial data whose rising edge or falling edge is synchronized with the synchronizing signal of the video signal and the color burst signal, and the formed 1-bit serial data with the digital video signal data. And an adding unit for adding the signal via a dedicated signal line, and transmits the 1-bit serial data together with the digital data of the video signal.

[Action]

Binarize multiple sync signals (SYNC, BURST) on the transmitter side and pass them through the gate to make 1-bit serial data, and add them to the video signal data using a dedicated signal line and transmit them to the receiver side. To As a result, the receiving side only needs to identify and use the plurality of transmitted synchronizing signals, and it is not necessary to extract the data from the video signal data as in the conventional case, so that the receiving side circuit configuration is simplified.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 shows the circuit configuration of this embodiment. In FIG. 1, (11) is a reproducing VTR and (12) is a recording VTR.
The video signal from the playback VTR (11) is internally converted into, for example, 8-bit parallel digital data for recording.
It is supplied to the encoder (14) in the VTR. Also, for playback V
Within TR (11), multiple sync signals, that is, sync signals (SY
NC) and the color burst signal (BURST) are binarized respectively, and these are converted into 1-bit serial data by passing through a simple gate circuit (not shown), as shown in FIG. Here, the binarization of the sync signal of the video signal and the color burst signal means simply comparing the predetermined levels of the sync signal of the analog video signal and the color burst signal by voltage comparison or the like, and the comparison result is a predetermined level. To obtain a binary signal that indicates greater or lesser magnitude. Also, since the interval from the end of the color burst signal to the fall of the next sync signal (SYNC) is an empty channel, there is a condition that the low level does not continue for a period longer than the width of the sync signal (SYNC). Thus, user bits, for example, 2-bit field information, 10-bit line information, or a title of a predetermined length may be used as an auxiliary signal (AUX) as shown in FIG.

These sync signals, color burst signals, and auxiliary signals as necessary, are recorded VTRs (12) via a single signal line.
Is supplied to the decoder (13). Considering a system in which the video signal data is 8 bits as described above, 9 or more signal lines (10 or more if clocks are sent in pairs) will be used together with the clock, so after this line, synchronization signals etc. The addition of the 1-bit signal line has almost no effect on the communication system.

Further, the clock signal CK is supplied from the reproducing VTR (11) to the decoder (13) and the encoder (14).

In the decoder (13), if a low level continues for a certain width or more, it is regarded as a sync signal (SYNC), and a waveform after a certain time from the sync signal is regarded as a color burst signal (BURST). A certain waveform after a certain time different from is regarded as an auxiliary signal (AUX). The time of each of these signals is set in advance. The synchronization signal (SYNC), the color burst signal (BURST) and the auxiliary signal (AUX) decoded by the decoder (13) are supplied to the encoder (14). In the encoder (14), the data is rearranged based on the line and field information contained in the auxiliary signal, signal processing such as adding parity is performed, and the magnetic tape is passed through the recording amplifier (16) and the recording head (17). Record in (18).

In addition, an auxiliary signal is supplied from the decoder (13) to the system controller (15), so that necessary information such as a title is displayed on a display (not shown).

In this way, in the present embodiment, the conventional digital comparator (3) of FIG. 3 processes the data of the 8-bit video signal to generate the synchronization signal (SYNC) and the color burst signal (BURST).
On the other hand, since the sync signal and the color burst signal need only be identified from the 1-bit serial data, the circuit configuration can be greatly simplified. Further, auxiliary signals other than the synchronization signal and the color burst signal can be added to the 1-bit serial data, so that it is possible to expect development. That is,
For example, in this embodiment, since the auxiliary signal includes the line information and the field information, the circuit (5) for detecting the line information and the field information, which is necessary in the conventional circuit of FIG. The circuit configuration of (4) can also be simplified. Furthermore, by including a title or the like in the auxiliary signal, this can be displayed via the system controller (15).

In the above-described embodiment, the case of dubbing between VTRs has been described as an example, but the present invention is not limited to this and is similarly applicable to other signal transmission systems.

〔The invention's effect〕

As described above, according to the present invention, phase information of a plurality of synchronization signals (SYNC) and a color burst signal (BURST) is binarized and added to the video signal data as 1-bit serial data. I decided to transmit it,
The circuit configuration on the receiving side can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a signal format according to the present invention, and FIG. 3 is a circuit diagram showing an example of a conventional device. (11) is a reproducing VTR, (12) is a recording VTR, (13) is a decoder, (14) is an encoder, (17) is a recording head, and (1
8) is a magnetic tape.

Claims (1)

(57) [Claims] 1. A signal transmission device for transmitting a digital video signal obtained by digitizing a video signal by adding a sync signal of the video signal and a color burst signal to the digital video signal, wherein the sync signal and the color burst signal of the video signal are transmitted. Two
Serial data forming means for digitizing and forming 1-bit serial data whose rising edge or falling edge is synchronized with the synchronizing signal and color burst signal of the video signal, and the formed 1-bit serial data with the digital image A signal transmission device comprising: an addition unit that adds the signal data to the signal data via a dedicated signal line, and transmits the 1-bit serial data together with the digital data of the video signal.