JPH02273379A - Digital signal processor - Google Patents

Abstract

PURPOSE:To transfer information on the attenuation quantity of an attenuator which is stored by a device before being moved to the device after being moved and to reproduce the stored operation of the attenuator by recording the attenuation quantity of the attenuator in a recording medium as a sub code. CONSTITUTION:At the time of recording, the C terminal of a switch 6 is connected to an A terminal. The output 12 of the attenuation quantity data from the attenuator 1 is inputted in a 1st converter 2. The converter 2 sets the data (D) obtained by sampling the output 12 every time a recording frame is started with a frame synchronizing signal 11 as the attenuation quantity data for the frame and outputs it as the output 7 converted into a sub code pack data system. The converted output 7 is rest recorded in a sub code pack area on a tape. Therefore, the attenuation quantity data specified by the attenuator 1 is recorded in frame units. Meanwhile, the data D is multiplied 4 by sound data 10 reproduced from the tape, which is outputted to a D/A converter 5. Then, the attenuated reproduction output specified by the attenuator 1 is obtained as the output 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital signal processing device applied to digital audio recorders and the like.

Background of the Invention In recent years, digital audio tape recorders (hereinafter referred to as DATs)
There have been remarkable advances in signal processing technology for digital audio equipment, such as those exemplified by An example of the configuration of a conventional DAT device having an attenuation storage function will be described below.

The attenuation storage function is a function that stores the attenuation changes of the volume attenuator that are manually operated during tape playback, and then automatically restores the attenuation changes when the tape is played back from the same location.

FIG. 2 is a block diagram showing an example of the configuration of a conventional attenuation storage device. 21 is an attenuator, 22 is a multiplier, 23 is D
/A converter, 24. 25 is a switch that can be switched in conjunction with recording and playback, 26 is a memory control circuit, 27
is a memory in which attenuation data is written.

The operation of the conventional attenuation storage device configured as described above will be explained below.

First, the operation for storing changes in the amount of attenuation of the attenuator 21 manually operated during recording will be described.

During recording, the C terminal of the switch 24 is connected to the A terminal side, and the C' terminal of the switch 25 is connected to the A' terminal.

Note that the switches 24 and 25 both have an 8-circuit configuration and can switch 8-bit data. The attenuation amount data output 29 from the attenuator 21 is input to the A terminal of the switch 24, and is input to the multiplier 22 via the switch 24. The multiplier 22 multiplies the digital audio data 30 reproduced from the tape by the attenuation data output 29 by a value sampled for each frame address 32 of the tape, and outputs the result to the D/A converter 23 . Therefore, the output 31 of the D/A converter 23 provides a reproduced output that has been attenuated as specified by the attenuator 21.

On the other hand, the attenuation amount data 29 from the attenuator 21 is
5 and is input to the memory control circuit 26 via the switch 25. The memory control circuit 26 writes the frame address 32 of the tape and the attenuation amount data 29 sampled for each frame address 32 of the tape in a one-to-one correspondence to the memory 27. Therefore, the attenuation data specified by the attenuator 21 is recorded in the memory 27 in association with the frame address.

Next, a description will be given of the operation when reproducing the same position on the tape and reproducing the reproduction output of the attenuation amount manipulated at the time of storage based on the attenuation amount data stored as described above. In this case, the C terminal of the switch 24 is switched to the B terminal side, and the C' terminal of the switch 25 is switched to the B' terminal side. When the tape is played back, the memory control circuit 26 reads the corresponding attenuation amount data stored in the memory 27 based on the frame address 32 of the tape, and switches the switch 25.
It is output to the C' terminal of. The attenuation data read from the memory 27 is transmitted to the switch 25 and the switch 24.
The signal is input to the multiplier 22 via the . The multiplier 22 switches and multiplies the digital audio data 30 reproduced from the tape by the attenuation data read out from the memory 27 in units of frames corresponding to the frame address 32 of the tape. Output to. Therefore, the output 31 of the D/A converter 23 can reproduce the reproduced output of the stored attenuation amount of the attenuator for each frame address unit on the tape.

Problems to be Solved by the Invention However, in the conventional configuration described above, the function of storing the amount of attenuation is unique to the device, and when a tape to be played is moved to another device of the same type, the tape before being moved is There was a problem in that the information on the amount of attenuation of the attenuator stored in the device was not transmitted to the device after the device was moved, and the memorized operation of the attenuator could not be reproduced.

The present invention solves the above-mentioned conventional problem, and is applied to devices such as DAT, and even if the tape to be played back is moved and played back in another similar device, the attenuator stored in the device before moving is An object of the present invention is to provide a digital signal processing device in which information on the amount of attenuation of the attenuator is transmitted to the device after the movement, and the stored operation of the attenuator can be reproduced.

Means for Solving the Problems The present invention provides a digital signal processing device that records an input signal on a recording medium, records attenuation amount data from an attenuator in a subcode area within the recording medium, and reproduces the recorded signal. a first converter that samples attenuation amount data from the attenuator for each frame during recording and converts it into subcode data; A second converter that converts into attenuation data, and a multiplier that selects the outputs of the attenuator and the second converter during recording or playback, and multiplies the outputs by the input signal. This is a characteristic feature.

According to the present invention having such features, when the attenuator is manually operated during tape playback and the attenuation amount of the attenuator is recorded on the recording medium, the attenuation amount data from the attenuator is recorded in the first
A converter samples the data frame by frame, converts it into subcode data in the recording medium, and records the data. At the same time, the attenuation amount data of the attenuator and the reproduced data are multiplied by a multiplier. In addition, when reproducing the same position on the tape with the same amount of attenuation, the subcode data played back from the tape is converted into attenuation amount data by a second converter, and then converted into the playback audio signal by a multiplier. I'm trying to multiply it.

Embodiment Hereinafter, an embodiment of the digital signal processing device of the present invention in a DAT will be described with reference to the drawings.

FIG. 1 shows a block diagram of a digital signal processing device of the present invention. In FIG. 1, 1 is an attenuator, 2 is an attenuation signal of the attenuator 1 and a frame synchronization signal 11, and at each start of a recording frame, the attenuation data is sampled and used as the attenuation data of that frame. This is the first converter that converts into packed data format. The converted output is then given to a recording device (not shown) as a subcode recording signal. Further, numeral 3 designates a second converter which is used during reproduction, is given a subcode signal, and converts the subcode signal into an attenuation amount data signal for each frame. The output of the attenuator 1 is connected to the input of the first converter 2 and to the A terminal of the switch 6. Further, the output of the second converter 3 is connected to the B terminal of the switch 6. switch 6 is C
It is a switch with eight circuits whose terminals are respectively connected to the A terminal or the B terminal during recording and reproduction. 4 is a multiplier to which output data from the C terminal of the switch 6 and digital audio data 10 are input. 5 is a D/A converter to which the multiplication output of the multiplier 4 is applied.

11 is a frame synchronization signal, which is supplied to the first converter 2 and the multiplier 4.

The operation of the digital signal processing device of this embodiment configured as described above will be explained below.

First, the operation for storing the attenuation amount change of the attenuator 1 that has been manually operated will be described. When recording, switch 6 is set to C.
The terminal is connected to the A terminal. Attenuation amount data Yamao 12 from attenuator 1 is input to first converter 2 . 1st
In the converter 2, the data obtained by sampling the attenuation data output 12 at each start of a recording frame by the frame synchronization signal 11 is used as the attenuation data of that frame, and is further converted into a subcode pack data format as a conversion ratio cuff. Output. The conversion ratio cuff is dubbing recorded in the subcode pack area on the tape. Therefore, the attenuation amount data specified by the attenuator 1 is recorded on the tape in units of frames.

On the other hand, the attenuation amount data 12 from the attenuator 1 is input to the multiplier 4 via the switch 6.

The multiplier 4 uses a frame synchronization signal 11 to output data obtained by sampling the attenuation data output 12 at each start of a recording frame and the digital audio data 1 reproduced from the tape.
0 and outputs the result to the D/4 converter 5.

Therefore, the output 9 of the D/A converter 5 provides a reproduced output that has been attenuated as specified by the attenuator 1.

Next, we will describe the operation when reproducing the same location on the tape on which dubbing was recorded by the above operation and reproducing the change in the amount of attenuation of the attenuator 1 that was manually operated.

During playback, the C terminal of the switch 6 is connected to the B terminal side. Subcode pack data 8 obtained by playing back the tape is input to the second converter 3. The second converter 3 converts the subcode pack data 8, which changes on a frame-by-frame basis, into attenuation amount data 13, and outputs it to the B terminal of the switch 6.

The attenuation amount data 13 is input to the multiplier 4 via the switch 6. The multiplier 4 multiplies the digital audio data 10 reproduced from the tape by the attenuation amount data 13 and outputs the result to the D/A converter 5. Therefore D
The output 9 of the /A converter 5 can reproduce the reproduced output attenuated by the attenuation amount of the attenuator 1 recorded in the subcode area of the tape.

As described above, according to this embodiment, by operating the attenuator 1,
When storing the attenuation amount data, the attenuation amount data output 12 can be dubbing recorded as pack data in the subcode area on the tape by the first converter 2.
In addition, when reproducing the operation of the attenuator 1 by reproducing the same location on the tape on which the dubbing was recorded, the subcode pack data obtained by reproduction is outputted as the original attenuation amount data by the second converter 3. 13 and can be reproduced.

Therefore, even if the tape to be played back is moved and played back on another similar device, the information on the amount of attenuation of the attenuator stored in the device before the move is transmitted to the device after the move, and the stored attenuator It is possible to reproduce the operation of

As described in detail, according to the present invention, since the attenuation amount is recorded as subcode information in the recording medium, even if the recording medium is moved to another device of the same type, the attenuation amount is recorded as subcode information in the recording medium. The effect is that the operation of the attenuator stored in the previous device can be reproduced in the moved device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a digital signal processing device in one embodiment of the present invention. FIG. 2 is a block diagram of an example of the configuration of a conventional attenuation storage device. 1... Attenuator, 2... First converter, 3.
...second converter, 4...multiplier, 5...
D/A converter, 6... switch, 21.
...attenuator, 22...multiplier, 23...D/A
Converter, 24.25...Switch, 26...
-Memory control circuit, 27...memory.

Claims (1)

[Scope of Claims] A digital signal processing device that records an input signal on a recording medium, records attenuation amount data from an attenuator in a subcode area within the recording medium, and reproduces the recorded signal, comprising: a first converter that samples attenuation data from the attenuator every frame during recording and converts it into subcode data; and a first converter that samples attenuation data from the attenuator every frame and converts it into subcode data during recording, and converts the subcode data reproduced from the recording medium into attenuation data on a frame basis during playback. a second converter for converting the signal; and a multiplier for selecting the outputs of the attenuator and the second converter respectively during recording or reproduction and multiplying the outputs by the input signal. Signal processing device.