KR0158617B1 - Multifunction video cassete recorder using digital signal processor - Google Patents

Abstract

The present invention relates to a video cassette recorder (VCR) capable of performing various functions by a digital signal processor (DSP) including a memory device. And to store software blocks for line monitors, DTMF reception, voice recording, voice playback, and sound velocity variable blocks in the memory device, and the software stored in the memory device in the digital signal processing device in response to a user's key input. By executing the block, it is possible to provide a video cassette recorder capable of performing various functions, controlling functions through key input of a telephone line, and efficiently using an expensive digital signal processing apparatus.

Description

Multifunctional Video Cassette Recorder with Digital Signal Processor

1 is a configuration block diagram of a video cassette recorder according to an embodiment of the present invention,

2 is a detailed block diagram of the digital signal processor of FIG.

3 is a list of programs stored in the memory device of FIG.

4 is a timing diagram illustrating a conventional double speed technique,

5 is a block diagram illustrating a general digital signal processing apparatus applied to a video cassette recorder.

FIG. 6 is a timing diagram illustrating a double speed technique using the digital signal processor of FIG.

* Explanation of symbols for main parts of the drawings

21: analog / digital interface unit 22: digital signal processor

23: digital / analog interface 24: host interface

25: memory interface 26, 27: ROM

28: RAM

The present invention relates to a video cassette recorder (VCR), and more particularly, to a video cassette recorder equipped with a digital signal processor (DSP) included as a memory device and performing various functions. It is about.

The conventional video cassette recorder has a problem that the screen is reproduced twice, but the audio signal is muted and the audio cannot be heard during the double-speed playback when the video cassette recorder tries to play at the double speed, and thus it is impossible to quickly listen to the video tape.

In order to solve the above problems, SANYO uses a large scale integrated circuit (LSI) called LC92032A, which is a sound speed variable integrated circuit, to repeat the playback and removal of speech at predetermined time units. Applied to the 2x playback function of.

4 is a timing diagram illustrating a conventional double speed technique, and the technique applied to FIG. 4 is applied to a Sanyo video cassette recorder.

Referring to FIG. 4, the conventional double speed technique is to repeat the operation of reproducing and removing the audio signal every 5 seconds. Thus, the voice present in the hatched portion of FIG. 4 is heard by the viewer.

However, this double speed technique reproduces and removes the voice at predetermined time intervals, so that some meaning of the voice information heard through the video cassette recorder can be understood, but the video tape such as news continuously contains voice. When playing at double speed, it is difficult to grasp the voice content.

Recently, with the development of digital signal processing technology, the digital signal processor and the memory device have been applied to a video cassette recorder to solve the voice reproduction problem of the above-mentioned double speed technique.

5 is a block diagram of a general digital signal processing apparatus applied to a video cassette recorder.

As shown in FIG. 5, a general digital signal processing apparatus 4 is externally supplied with power and connected to a host controller of a video cassette recorder so as to enable input and output of signals.

The general digital signal processing apparatus 4 includes an analog / digital converter 41 for converting an input signal into a digital signal; A digital signal processor 42 which receives the output of the analog / digital converter 41 and performs a high speed arithmetic operation; A digital / analog converter (43) for reproducing voice information processed by the digital signal processor (42) as an analog signal; And a ROM (44, 45) and RAM (46) for storing programs and data connected to the digital signal processor 42 via a bus to allow the digital signal processor 42 to perform appropriate operations. .

FIG. 6 is a timing diagram illustrating the double speed technique performed by the digital signal processing apparatus 4 described above. 6A is an input signal IN of the digital signal processing apparatus 4, and FIG. 6B is an output signal OUT of the digital signal processing apparatus 4. As shown in FIG.

The digital signal processing apparatus 4 of FIG. 5 periodically removes the same voice signal components one by two in the time domain, thereby changing the tone and without losing the voice information. 2x playback is possible.

By the way, it is very uneconomical to use the digital signal processing apparatus only for the double speed reproduction of the video cassette recorder as above. This is because the expensive digital signal processing apparatus can perform various functions.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems as described above, and provides a multi-function video cassette recorder using a digital signal processor that enables the digital signal processing device to add a function other than double-speed playback of sound by expanding the memory. There is.

In addition, another object of the present invention is to provide a multi-function video cassette recorder using a digital signal processor that can be connected via a telephone line to be remotely controlled from the outside.

As a means for achieving the above object, the configuration of the present invention,

An analog / digital interface unit for removing an input of a digital signal obtained by changing an analog signal of a telephone line or a video cassette recorder;

A digital / analog interface for controlling output of the processed digital data to a digital / analog converter;

A host interface for controlling data input / output and a host controller of the video cassette recorder;

A line monitor block that monitors the status of the telephone line, a DTMF receiving block that decodes key input defined by the user, a voice recording block that records the user's voice data, and voice data recorded in response to the user's key input. A memory device for storing a voice reproducing block for reproducing and a sound speed variable block for removing one of the same two components by comparing voice data during double speed reproducing, and providing a storage space for system operation;

A memory interface unit controlling data input / output to the memory device;

A software block stored in the memory device is executed, and in order to control a video cassette recorder, a control command corresponding to data input from the analog / digital interface unit is processed and output to a host interface unit according to the execution of the software block. Reads voice data stored in the memory device through the memory interface unit and outputs the voice data stored in the memory device to the digital / analog interface, and inputs the voice data input to the analog / digital interface unit during voice recording through the memory interface unit. It consists of a digital signal processor that stores in the device.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a configuration block diagram of a video cassette recorder according to an embodiment of the present invention,

2 is a detailed block diagram of the digital signal processor of FIG.

3 is a list of programs stored in the memory device of FIG.

First, a video cassette recorder capable of remote control according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the video cassette recorder 1 according to the embodiment of the present invention includes a digital signal processor 2 and a host controller 3 connected to enable input and output of signals to each other.

The digital signal processor 2 is connected to a parallel connector 5 having a telephone 4 connected at one end thereof, and the parallel connector 5 is connected to an exchange station 6 of a telephone station.

When making a call to control the video cassette recorder 1 from the outside, the switching center 6 connects the subscriber's telephone line.

Thus, the signal transmitted from the switching center 6 reaches the telephone 4 and the video cassette recorder 1 via the parallel connector 5.

At this time, if the user is absent, control of the telephone is transferred to the digital signal processing unit 2, and the digital signal processing unit 2 performs remote control of the video cassette recorder in response to the user's key input through the telephone line.

The control by the digital signal processor 2 monitors the telephone line, decodes a key input transmitted through the telephone line and executes a corresponding command, stores and reproduces a message indicating that the user is not present. There is a function for reproducing audio at double speed during double speed playback of a video cassette recorder.

The digital signal processor 2 and the host controller 3 input and output control signals and data, and the direct operation of the video cassette recorder is controlled by the host controller 3.

Next, the configuration of the digital signal processor 2 of FIG. 1 will be described in more detail with reference to FIGS. 2 and 3.

As shown in FIG. 2, the digital signal processor 2 according to the embodiment of the present invention includes an analog / digital interface 21, a digital signal processor 22, a digital / analog interface 23, and a host interface unit ( 24), memory interface 25, ROMs 26 and 27, and RAM 28.

The analog / digital interface 21 receives an output signal of the analog / digital converter and is connected to output the signal to the digital signal processor 22.

The digital signal processor 22 receives an output signal of the analog / digital interface 21, is connected to output a signal to the digital / analog interface 23, and is connected to the host interface 24 and the memory interface via a bus. Connected to the unit 25.

A digital / analog converter is connected to the output terminal of the digital / analog interface 23.

The host interface unit 24 is connected to the bus while being able to input and output data with the host controller. The memory interface 25 is connected to the digital signal processor 22 via a bus, while connected to the ROMs 26 and 27 and the RAM 28.

The ROM 26 stores a program for controlling the digital signal processor 2, the ROM 27 stores voice data for guiding a key corresponding to a function of a video cassette recorder, and the RAM 28 stores a system memory. Used as

Referring to FIG. 3, the program stored in the ROM 26 is as follows.

As shown in FIG. 3, a predetermined number of program blocks are stored in the ROM 26. The program blocks include a line monitor block 261, a DTMF receiving block 262, a voice recording block 263, and voice reproduction. Block 264 and the sound velocity variable block 265.

Next, the operation of the digital signal processor 2 according to the embodiment of the present invention will be described with reference to FIGS. 2 and 3.

When power is applied and the operation of the circuit starts, the line monitor block 261 of the ROM 26 is loaded by the digital signal processor 22 and the memory interface unit 25 in a predetermined area on the RAM 28 and then performed. By the execution of the line monitor block 261, it is monitored whether a call is received through the telephone line or the call is disconnected.

At this time, when a telephone line is connected and a key transmitted by the user through the telephone line is input to the digital signal processor 22 through the analog / digital converter and the analog / digital interface 21, the dual tone multi frequency of the ROM 26 is input. Receive block 262 is performed, and the input key is decoded to obtain a corresponding code.

When a code corresponding to the input key is obtained by the execution of the DTMF receiving block 262, the digital signal processor 22 receives a command corresponding to the code. That is, operations for controlling normal operations of the video cassette recorder such as power on of the video cassette recorder, power on of the television, channel selection, recording reservation and completion time, and start of recording are performed.

In performing the above operation, the digital signal processor 22 inputs and outputs a control command to the host controller of the video cassette recorder through the host interface unit 24.

The ROM 27 also stores voice data for guiding keys corresponding to the functions of the video cassette recorder so that the user can conveniently use the remote control, and the digital signal processor 22 stores the data before the user inputs the key. The function guide voice data stored in the ROM 27 is informed to the user through the digital / analog interface 23 and the digital / analog converter.

The DTMF receiving block 262 reproduces the voice content of another person who has called when the user is away from the specific key input by the user. Voice content of other people who have called when the user is absent is stored in a predetermined area of RAM 28 via telephone line, analog / digital converter, analog / digital interface 21, digital signal processor 22, memory interface 25 do. When the DTMF receiving block 262 is performed, when a user inputs a specific key, the voice content of another person stored in a predetermined area of the RAM is reproduced. The playback of the recorded voice is performed by transferring the data stored in the RAM 28 to the user through the telephone line via the memory interface 25, the digital signal processor 22, the digital / analog interface 23, and the digital / analog converter. do.

In addition, the DTMF receiving block 262 performs the voice recording block 263 in response to a user's specific key input. When the voice recording block 263 is performed, the DTMF receiving block 262 transmits a call to the called party when the user is absent. You can record the voice you want.

Voice recording operation is similar to the above, the voice input through the telephone line is converted into a digital signal from the analog / digital transducer, and then through the analog / digital interface 21, the digital signal processor 22, the memory interface unit 25 It is stored in the predetermined area of 28.

In addition, the DTMF receiving block 262 performs a function of reproducing a message pre-recorded by the user when there is a specific key input from someone other than the user. That is, if there is a specific key input predefined during operation of the DTMF receiving block 262, the voice reproduction block 264 is performed correspondingly.

When the voice play block 264 is performed, the voice of the user stored in the small area of the RAM 28 is read by the voice record block 263. The data read from the RAM 28 is input to the digital / analog converter via the memory interface 25, the digital signal processor 22, and the digital / analog interface 23, and is converted into an analog signal by the digital / analog converter. After that, it is delivered to the caller through the telephone line.

On the other hand, when a key of the video cassette recorder is operated to perform the double speed operation, a predetermined input is input from the host interface unit 24 to the digital signal processor 22.

At the same time, an audio signal for double speed is input to the analog / digital converter, converted into a digital signal, and then input to the digital signal processor 22 via the analog / digital interface 21.

The digital signal processor 22 performs the sound speed variable block 265 of the ROM 26 when a command for double speed is input from the host interface unit 24.

When the speed variable block 265 is performed, the digital signal processor 22 compares the divided voice data after dividing the input voice data by a predetermined unit in the time domain, and if there is the same data among the divided data, two identical Remove one data per data.

The data after removal is sent to the digital / analog converter via the digital / analog interface 23, converted into an analog signal in the digital / analog converter and then provided to the video cassette recorder.

As a result, no change in tone occurs during the double-speed playback operation.

The digital signal processor 2 of the present invention described above is configured to share the power supply with the video cassette recorder, thereby reducing the installation cost of the power supply.

As described above, in the embodiment of the present invention, a video cassette recorder having various functions can be provided by storing a program for a function added to a memory device and executing the same in a digital signal processing device in response to a user's key input. .

In addition, the digital signal processor of the present invention can be configured to be connected to a telephone line, thereby providing a video cassette recorder capable of controlling a function through key input of the telephone line.

According to the embodiment of the present invention, it is possible to provide a video cassette recorder capable of efficiently using an expensive digital signal processing apparatus.

Claims (3)

An analog / digital interface unit for controlling input of a digital signal obtained by converting an analog signal of a telephone line or a video cassette recorder; A digital / analog interface for controlling output of the processed digital data to a digital / analog converter; A host interface for controlling data input / output and a host controller of the video cassette recorder; A line monitor block for monitoring the status of the telephone line, a DTMF reception block for decoding key input defined by the user, a voice recording block for recording the user's voice data, and voice data recorded in response to the user's key input. A memory device for storing a voice reproducing block for reproducing and a sound speed variable block for removing one of the same two components by comparing voice data during double speed reproducing, and providing a storage space for system operation; A memory interface unit controlling data input / output to the memory device; A software block stored in the memory device is executed, and a control command corresponding to data input from the analog / digital interface unit is processed and output from a host interface unit according to the execution of the software block to control a video cassette recorder. And read voice data stored in the memory device through the memory interface unit and output the voice data stored in the memory device to the digital / analog interface. During voice recording, the voice data is output from the analog / digital interface unit to the memory device. A digital signal processing device comprising a digital signal processor for storing. The memory device of claim 1, wherein the memory device comprises: a first ROM storing a software block; A second ROM storing audio data for guiding a key corresponding to a function of a video cassette recorder; Digital signal processing apparatus comprising a RAM for providing temporary storage system data. The digital signal processing apparatus according to claim 1, further comprising a parallel connector connected to transmit and receive a signal between the telephone exchange and the video cassette recorder.