KR100197374B1 - Decision circuit for frame size of a digital vcr audio system - Google Patents

Abstract

According to the present invention, each audio track is composed of a channel-1 audio region and a channel-2 audio region, and each channel is formatted with a frame size according to a system mode, and the cumulative value for the difference in frame sizes between the channels is allowed. The present invention relates to an audio frame size determination apparatus of a digital VCR which inserts an audio signal into the channel-1 audio region and performs audio editing. The start size insert mode provides frame size data according to the system mode. A preset generation unit (120) for providing frame size data corresponding to a value obtained by subtracting the cumulative value from the formatted frame size if the cumulative value of the frame size difference between the channels exceeds an allowable cumulative value; If the cumulative value for the frame size difference between the start insert mode and the channel exceeds an allowable cumulative value, the frame size data provided by the preset generating means is stored. In the normal insert mode, the frame size data of the channel-2 audio signal of the previous track is stored. The first register 130 to store the; A second register (140) for storing frame size data for the channel-2 audio signal; A comparator that receives the frame size data provided from the first register 130 and the frame size data provided from the second register 140 to detect the frame size difference in track units and accumulates the frame size difference between channels ( 150); And a control unit 110 for controlling the preset generator 120 and the first register 130 so that the cumulative value of the frame size difference between channels does not exceed the allowable cumulative value.

Description

Frame size determination system of digital V-Audio system

1 is a track format diagram for each track of a digital VCR.

2 is a detailed block diagram showing a preferred embodiment of the present invention.

3 is an audio track diagram of a two channel mode illustratively shown in accordance with a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

110: controller 120: preset generator

130140: Register 150: Comparator

The present invention relates to a frame size determination apparatus for determining a frame size between channel-1 and channel-2 when an audio signal is inserted into a channel-1 region of audio in a digital VCR (Video Cassette Recorder) audio system. It is about.

In general, the VCR is a device for recording and playing video signals, recording and playing back other tapes, absent video recording, and camera recording. Technology is reaching today thanks to the advancement of precision machining and semiconductor technology.

Also, in recent years, in the transmission of video signals, analog video signals are converted to digital transmissions and recorded because of the fact that digital transmission can maintain much better image quality than analog transmission. The development of digital VCR capable of recording is in full swing.

This digital VCR encodes information as shown in FIG. 1 and records it in a track of the tape 11, each track having a video signal region 11A, an audio signal region 11B, and a control region 11C. And so on.

In particular, in the two-channel mode, the audio region 11B is classified and recorded as channel-1 and channel-2. At this time, the audio signals of channel-1 and channel-2 form one audio frame.

On the other hand, the size of the audio frame is defined by the average value given in the format as shown in Table 1 according to the system mode, the number of audio samples (frame size) per frame is shown in Table 1 and the audio frame size between each channel must match.

As shown in Table 1, the frame size of each channel is defined, but substantially the frame size recorded in each channel is recorded within a certain allowable range. In other words, it is very difficult to accurately match the frame sizes of channel-1 and channel-2 as defined in the format. Therefore, the difference between the frame size of channel-1 and the frame size of channel-2 is detected for each track. The difference between the frame size of -1 and the frame size of channel-2 is accumulated in track units so that the accumulated value is recorded within a range not exceeding a certain allowable value.

Table 2 shows the format for this cumulative allowance.

As shown in Table 2, for example, in the 525/60 and 48KHz modes, the difference between the frame size of channel-1 and the frame size of channel-2 is accumulated in track units so that the cumulative result does not exceed the accumulation allowance of ± 20. It is.

On the other hand, when audio editing is performed, an audio signal is inserted into a certain channel. When an audio signal is inserted into an audio region of channel-2 while an audio signal is already recorded in the audio region of channel-1, By inserting an audio signal into the audio region of the channel-2 with reference to the frame size of the channel-1, audio editing is easy because the frame sizes between the channels can be matched.

However, if an audio signal is recorded in the audio region of channel-1 while an audio signal is recorded in the audio region of channel-3, the audio region of channel-2 is located later in time so that the frame of the channel-1 audio region Since there is no reference frame for determining the size, audio editing is very difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and provides a frame size determination apparatus for performing audio editing in which an audio signal is inserted into a channel-1 audio region, but the cumulative value of the frame size difference between channels does not exceed an allowable cumulative value. The purpose is to provide.

In order to achieve the above object, according to the present invention, each audio track is composed of a channel-1 audio region and a channel-2 audio region, and each channel is formatted with a frame size according to a system mode. An audio frame size determination apparatus of a digital VCR in which an audio editing is performed by inserting an audio signal into the channel-1 audio region and performing audio editing, wherein the cumulative value for is not exceeded an allowable cumulative value. A preset generator which provides frame size data and provides frame size data corresponding to a value obtained by subtracting the accumulated value from the formatted frame size if the accumulated value of the frame size difference between the channels exceeds an allowable accumulated value; If the cumulative value for the frame size difference between the start insert mode and the channel exceeds an allowable cumulative value, the frame size data provided by the preset generating means is stored. In the normal insert mode, the frame size data of the channel-2 audio signal of the previous track is stored. A first register for storing a; A second register for storing frame size data for the channel-2 audio signal; A comparator configured to receive the frame size data provided from the first register and the frame size data provided from the second register, detect a frame size difference in track units, and accumulate the frame size difference between channels; And a controller for controlling the preset generator and the first register such that the accumulated value of the frame size difference between channels does not exceed the allowable accumulated value.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 shows a preferred embodiment of the present invention in which the frame size of the channel-1 audio region is determined by referring to the frame size recorded in the channel-2 audio region of the previous track when the audio signal is inserted into the channel-1 audio region. Shown.

3 shows an exemplary audio track in the two channel mode. As shown in FIG. 3, in the two-channel mode audio track, channel-1 and channel-2 form one track, and in the preferred embodiment of the present invention, channel-1 of the n + 1 (n; integer) th track The frame size for the audio region refers to the frame size for the channel-2 audio region of the nth track.

As shown in FIG. 2, in the first insertion mode, the controller 110 is provided with a start insertion signal and a system mode signal indicating the system mode through lines L1 and L2, respectively. When the start insert signal and the system mode signal are provided, the controller 110 determines the frame size according to the system mode as shown in Table 1, and then supplies a preset mode signal corresponding to the start insert mode and the frame size through the line L3. And a preset selection signal corresponding to the start insertion mode through the line L4.

The preset generator 120 stores frame size data for each system mode as shown in Table 1, and when a preset mode signal is provided through the line L3, the channel-1 register 130 as shown in Table 1 is provided. Provides frame size data according to the system mode.

For example, if the system mode is 525/60 or 48KHz mode, the preset generator 120 provides audio frame size data of 1601 to the channel-1 register 130. The channel-1 register 130 is provided with a preset selection signal corresponding to the start insert mode through the line L4. The channel-1 register 130 stores frame size data of 1601 when a preset selection signal corresponding to the start insert mode is provided.

The channel-1 register 130 stores frame size data of an audio signal for insertion into channel-1 of each track as shown in FIG. In addition, the channel-2 register 140 described later stores frame size data of an audio signal recorded in channel-2 of each track.

That is, as shown in FIG. 3, the audio track is n-1, n, n + 1, n + 2, ... When made up of tracks, the frame size data of the audio signal recorded in channel-2 of each track is provided in sequence in the channel-2 register 140, and the frame stored in the channel-1 register 130 in channel-1 of each track. Audio signals having a size are inserted sequentially.

Therefore, when the first insertion is made from channel-1 of the n-1th track, an audio signal having a frame size of 1601 stored in the channel-1 register 130 will be inserted into channel-1 of the n-1th track. In addition, frame size data of the audio signal recorded on the n−1 th channel-2 may be provided to the channel-2 register 140.

The frame size data stored in the channel-1 register 130 and the frame size data stored in the channel-2 register 140 are provided to the comparator 150.

As shown in Table 2, the comparator 150 stores a cumulative allowance value according to each mode. Therefore, the comparator 150 detects the difference a1 between the frame size data provided from the channel-1 register 130 and the frame size data provided from the channel-1 register 140, thereby channel-1 and channel-2. Compares the difference between the audio frame sizes with the cumulative allowances shown in Table 2 and provides a corresponding signal to the controller 110 when the difference between the audio frame sizes of channel-1 and channel-2 does not exceed the cumulative allowance. do.

The control unit 110 receives a signal from the comparator 150 corresponding to the normal insertion mode via the line L4 when a signal is provided indicating that the difference between the audio frame sizes of channel-1 and channel-2 has not exceeded the cumulative allowance. Provide a signal.

The channel-1 register 130 stores the frame size data of the channel-2 audio signal of the n-1th track stored in the channel-2 register 140 when a signal corresponding to the normal insertion mode is provided through the line L4. do. Meanwhile, the channel-2 register 140 provides frame size data for the channel-2 audio signal of the n-1th track to the channel-1 register 130 and then records the audio signal recorded in the channel-2 of the nth track. Stores frame size data.

The channel-1 register 130 provides the frame size data of the channel-2 audio signal of the n-1th track to the comparator 150, while the audio referred to for recording the audio signal to channel-1 of the nth track. Provided as the frame size. The channel-2 register 140 provides the comparator 150 with frame size data of an audio signal recorded on channel-2 of the nth track.

The comparator 150 detects a difference a2 between the frame size data provided from the channel-1 register 130 and the frame size data provided from the channel-1 register 140, and detects the frame size data previously detected. Accumulate with difference a1. Then, the comparator 150 compares the cumulative value a1 + a2 with the cumulative allowance shown in Table 2 and provides a corresponding signal to the controller 110 when the cumulative value a1 + a2 does not exceed the cumulative allowance. When the cumulative value a1 + a2 exceeds the cumulative allowable value, the controller 110 provides an Eri signal, a cumulative value a1 + a2, and a sign bit for the cumulative value.

When the control unit 110 receives a signal from the comparator 150 indicating that the accumulation value a1 + a2 does not exceed the accumulation allowance, the controller 110 provides a signal corresponding to the normal insertion mode through the line L4. Likewise, the process of referring to the frame size of channel-1 of the predetermined track with respect to channel-2 of the previous track is repeated.

On the other hand, when the controller 110 receives the error signal, the accumulated value a1 + a2 and the sign bit for the accumulated value from the comparator 150, the controller 110 accumulates the accumulated value a1 + a2 and the accumulated value in the preset generator 120. Provides a sine bit for and provides a preset mode signal corresponding to the error mode via line L3, while providing a preset selection signal corresponding to the error mode via line L4.

When the preset generator 120 receives the preset mode signal corresponding to the error mode, the accumulated value a1 + a2, and the sine bits for the accumulated value from the controller 110, the frame size according to the system mode as shown in Table 1 below. Frame size data obtained by subtracting or adding the accumulated value (a1 + a2) to the channel-1 register 130 is provided.

The channel-1 register 130 stores the frame size data provided from the preset generator 120 when a preset selection signal corresponding to the error mode is provided through the line L4.

As described above, in the preferred embodiment of the present invention, when an audio signal is inserted into the channel-1 while the audio signal for the channel-2 audio region of each track is recorded, the audio signal for the channel-2 of the previous track is changed. The frame size for channel-1 of the current track is determined by referring to the frame size, but the frame size data of each system mode is used so that the cumulative value of the difference in the frame size data between channels of each track does not exceed a certain allowable range. do.

Therefore, the present invention has the effect that the audio editing for inserting the audio signal into the channel-1 in the state where the audio signal for the channel-2 audio region of each track is recorded is very easily implemented.

Claims (1)

Each audio track is composed of a channel-1 audio region and a channel-2 audio region, and each channel is formatted with a frame size according to a system mode, and the cumulative value of the frame size difference between the channels does not exceed an allowable cumulative value. An audio frame size determination apparatus of a digital VCR, which is defined and performs audio editing by inserting an audio signal in the channel-1 audio region, the apparatus comprising: providing frame size data according to the system mode in a start insertion mode, A preset generator (120) for providing frame size data corresponding to a value obtained by subtracting the accumulated value from the formatted frame size if the accumulated value of the frame size difference therebetween exceeds an allowable accumulated value; If the cumulative value for the frame size difference between the start insert mode and the channel exceeds an allowable cumulative value, the frame size data provided by the preset generating means is stored. In the normal insert mode, the frame size data of the channel-2 audio signal of the previous track is stored. The first register 130 to store the; A second register (140) for storing frame size data for the channel-2 audio signal; A comparator that receives the frame size data provided from the first register 130 and the frame size data provided from the second register 140, detects the frame size difference in track units, and accumulates the frame size difference between channels ( 150); And a control unit (110) for controlling the preset generator (120) and the first register (130) so that the cumulative value of the frame size difference between channels does not exceed the allowable cumulative value.