KR100263895B1 - Dolby audio processor in a digital/analogue broadcast - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal processing apparatus. In particular, Dolby audio signal processing in digital / analog broadcasting for processing analog / digital audio signals by conventional analog broadcasting and digital broadcasting using a single Dolby audio processing block Relates to a device.

According to the present invention, Dolby audio signal processing of a digital broadcasting audio signal and an analog broadcasting audio signal is commonly signal processed by a single analog Dolby audio signal processing block or a digital Dolby audio signal processing block, thereby enabling digital / analog broadcasting with fewer components. The Dolby Audio signal processing of the audio signal can be processed together.

Description

Dolby Audio Signal Processing Equipment for Digital / Analog Broadcasting

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal processing apparatus. In particular, Dolby audio signal processing in digital / analog broadcasting for processing analog / digital audio signals by conventional analog broadcasting and digital broadcasting using a single Dolby audio processing block Relates to a device.

With the development of broadcast technology, not only broadcast by conventional analog broadcast but also digital broadcast by digital signal compression technology is being realized. Currently, analog and digital broadcasting are not simultaneously performed, but in the future, a broadcasting station will transmit a digital broadcasting signal and an analog broadcasting signal together.

According to the related art, in order to process an analog broadcasting audio signal and a digital broadcasting audio signal with a Dolby audio signal, an analog Dolby signal processing unit and a digital Dolby signal processing unit must be separately installed so that Dolby audio signals can be processed. By using the signal processing block, there is a problem that the material cost is significantly increased.

The technical problem to be achieved by the present invention is to enable the Dolby signal processing of the audio signal by analog broadcast or the audio signal by digital broadcast using only one analog or digital Dolby audio signal processing block to solve the above problems. The present invention provides a Dolby audio signal processing apparatus in digital / analog broadcasting.

1 is a block diagram of an apparatus for processing Dolby audio signals in digital / analog broadcasting according to an embodiment of the present invention.

2 is a block diagram of an apparatus for processing Dolby audio signals in digital / analog broadcasting according to another embodiment of the present invention.

In order to achieve the above technical problem, an apparatus for processing Dolby audio signals in digital / analog broadcasting according to an embodiment of the present invention is provided in a demodulated analog broadcast audio signal and a digital broadcast audio processing block which are demodulated and output in an analog broadcast audio processing block. An apparatus for processing a decoded and decoded decoded digital broadcast audio signal to be a Dolby audio signal, the apparatus comprising: an analog / digital converter for converting the demodulated analog broadcast audio signal into a digital signal and outputting the digital signal; A switching unit for inputting a negative output signal to a second input terminal, a decoded digital broadcast audio signal to a first input terminal, and selecting and outputting one input terminal signal according to a switching control signal; Judge whether it is received, A control unit for generating a switching control signal for selecting one of the signals input to the first and second input terminals of the switching unit according to the presence or absence of a digital broadcast audio signal or a user's selection, and an output signal of the switching unit It is characterized in that it comprises a digital Dolby signal processing unit for processing the Dolby signal by a digital method and a digital / analog converter for converting the digital output signal of the digital Dolby signal processing unit into an analog signal.

In accordance with another aspect of the present invention, there is provided a Dolby audio signal processing apparatus for digital / analog broadcasting in a demodulated analog broadcast audio signal and a digital broadcast audio processing block which are demodulated and output in an analog broadcast audio processing block. An apparatus for processing a decoded and decoded decoded digital broadcast audio signal to be a Dolby audio signal, the apparatus comprising: a digital / analog converter for converting the decoded digital broadcast audio signal into an analog signal and outputting the analog signal; A switching unit for inputting a negative output signal to a first input terminal, the demodulated analog broadcast audio signal to a second input terminal, and selecting and outputting only one input terminal signal according to a switching control signal; Determine if is received And a control unit for generating a switching control signal for selecting one of the signals applied to the first and second input terminals of the switching unit in accordance with the presence or absence of the digital broadcast audio signal or the user's selection. Inputting a negative output signal, characterized in that it comprises an analog Dolby signal processor for processing the Dolby signal by the analog method.

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

As shown in FIG. 1, an apparatus for processing Dolby audio signals in digital / analog broadcasting according to an embodiment of the present invention includes an antenna 101, a tuner 102, a digital broadcast signal demodulator 103, and a demultiplexer 104. ), Audio decoder 105, analog broadcast signal demodulation unit 106, stereo signal processing unit 107, analog / digital conversion unit (A / D conversion unit: 108), switching unit 109, digital Dolby signal processing unit ( 110, a digital / analog converter (D / A converter: 111), an audio signal processor 112, an amplifier 113, a controller 114, and a key input 115.

The antenna 101 receives a digital broadcast signal or an analog broadcast signal transmitted from a broadcast station. The antenna 101 receives each broadcast signal transmitted from a broadcasting station by means of the installed digital broadcast receiving antenna and the analog broadcast receiving antenna, respectively. In some cases, a signal transmitted from a broadcasting station may be received by a single antenna designed to receive analog broadcast and digital broadcast signals together.

The digital broadcast signal or the analog broadcast signal received by the antenna 101 tunes and outputs a broadcast signal of a channel selected by the user by the tuner 102, and when the digital broadcast signal is input, in order to tune the digital broadcast signal. The broadcast signal is tuned by the digital broadcast tuning processing block inside the tuner 102 and output to the digital broadcast signal demodulation unit 103. When an analog broadcast signal is input, the broadcast signal is input to the analog broadcast tuning processing block inside the tuner 102. The broadcast signal is tuned to the analog broadcast signal demodulator 106, and when the analog broadcast signal and the digital broadcast signal are input at the same time, the respective broadcast signals are tuned to the digital broadcast signal demodulator 103 and the analog broadcast signal. The demodulation section 106 separates the outputs.

When the digital broadcast signal is received, it is demodulated by the digital broadcast signal demodulator 103 and then output as data of a multi-bit string. Then, the received multiple bit string data is separated and output by the demultiplexer 104 into individual bit strings of the video signal and the audio signal.

The individual bit string data of the separated audio signal is decoded by the audio decoder 105, and the decoded digital audio signal is applied to the first input terminal of the switching unit 109.

When the analog broadcast signal is received, the input analog broadcast signal removes the video signal from the analog broadcast signal demodulator 106 and separates only the audio signal, and then demodulates the separated audio signal. The demodulated audio signal is subjected to stereo signal processing by the stereo signal processing unit 107 to separate the audio signal into R and L channels to compensate for frequency characteristics. Thereafter, the stereo signal processed audio signal is converted into a digital signal by the analog / digital converter 108 and input to the second input terminal of the switching unit 109.

The controller 114 inputs the audio bit string data output from the demultiplexer 104 to determine whether a digital audio broadcast signal by digital broadcasting is received through the tuned channel. When a digital broadcast audio signal by digital broadcast is received, the switching unit 109 generates a switching control signal for selecting and outputting the digital broadcast audio signal.

According to the program design of the control unit 114, the switching control signal generates a switching control signal that selects and outputs the digital broadcasting audio signal in preference to the audio signal of the analog broadcasting when the digital broadcasting and the analog broadcasting are simultaneously received. Can be set. In some cases, a switching control signal may be generated so that a user may manually select the input signal of the switching unit 109 by a key command of the key input unit 115, and the digital broadcast audio signal may be detected. If not, the switching control signal can be set to automatically select and output the analog broadcast audio signal.

In the switching unit 109 according to the switching control signal of the control unit 114, the decoded digital broadcast audio signal applied to the first input terminal or the analog broadcast audio signal converted to the demodulated digital signal applied to the second input terminal, The audio signal input to one input terminal is selected and output.

The decoded digital broadcast audio signal selected and output by the switching unit 109 or the analog broadcast audio signal demodulated and converted into a digital signal is processed by the digital Dolby signal processing unit 110 by a digital Dolby signal to obtain a frequency characteristic of the audio signal. And S / N (Signal / Noise) values are improved.

The digital Dolby signal processed audio signal is converted into an analog signal by a digital / analog converter (D / A converter: 111) and output.

In this case, the audio signal processing unit 112 performs audio signal processing such as compensation of frequency characteristics and audio level change for the user to emphasize high / low sound according to a set value by a key input of the key input unit 115. The audio signal is processed and output with sound quality of desired characteristics.

In addition, the audio signal processor 112 may add various compensation circuits, such as adding a circuit for generating an echo characteristic, depending on the model.

The audio signal whose sound quality is compensated by the audio signal processor 112 is amplified by the amplifier 113 with a constant gain, and after impedance matching, is output to the speaker.

Next, as shown in FIG. 2, the Dolby audio signal processing apparatus for digital / analog broadcasting according to another embodiment of the present invention includes an antenna 201, a tuner 202, a digital broadcast signal demodulator 203, and a demultiplexer. 204, audio decoder 205, digital / analog converter (D / A converter: 206), analog broadcast signal demodulator 207, stereo signal processor 208, switching unit 209, analog Dolby signal A processor 210, an audio signal processor 211, an amplifier 212, a controller 213, and a key input unit 214 are provided.

The difference between the embodiment of the present invention shown in FIG. 2 and the embodiment of the present invention shown in FIG. 1 is different from the embodiment of the present invention shown in FIG. 1. In contrast to performing the Dolby signal processing of the audio signal by the analog signal and the audio signal by the analog broadcast method, in the embodiment of the configuration shown in FIG. It is configured to perform Dolby audio signal processing in common with the broadcast audio signal.

2, the decoded audio signal of the digital broadcast audio signal is converted into an analog signal by the digital / analog converter 206 and input to the first input terminal of the switching unit 209. The demodulated audio signal of the signal is input to the second input terminal of the switching unit 209 as an analog signal without being converted into a digital signal. Then, after being selected by the switching control signal generated by the control unit 213 in the same manner as described in FIG. 1, the analog Dolby signal processing unit 210 processes the Dolby signal by an analog method to improve frequency characteristics and noise characteristics. The audio signal processor 211 is then output to the audio signal processor 211.

Then, the audio signal processor 211 and the amplifier 212 execute the same operations as those described in the audio signal processor 112 and the amplifier 113 of FIG. 1, and then output the signal-processed audio signal to the speaker. .

According to the above configuration, the analog broadcast audio signal and the digital broadcast audio signal using the digital Dolby signal processor for the Dolby signal processing by a single digital method or the analog Dolby signal processor for the Dolby signal processing by a single analog method Everyone can handle Dolby Audio signals. When the digital broadcast audio signal and the analog broadcast audio signal are input at the same time, the digital broadcast audio signal is automatically selected to process the Dolby audio signal.

As described above, according to the present invention, the Dolby Audio signal processing of the digital broadcast audio signal and the analog broadcast audio signal is signal-processed in common by a single analog Dolby audio signal processing block or a digital Dolby audio signal processing block, thereby reducing the number of components. Dolby audio signal processing of the digital / analog broadcast audio signal can be processed together.

Claims (3)

An apparatus for processing Dolby audio signals by demodulating analog broadcast audio signals demodulated and output from an analog broadcast audio processing block and decoded digital broadcast audio signals demodulated and decoded and output from a digital broadcast audio processing block, An analog / digital converter for converting the demodulated analog broadcast audio signal into a digital signal and outputting the digital signal; A switching unit for inputting an output signal of the analog / digital converter to a second input terminal, a decoded digital broadcast audio signal to a first input terminal, and selecting and outputting one input terminal signal according to a switching control signal; A switch for determining whether the digital broadcast audio signal is received and for selecting one of the signals input to the first and second input terminals of the switching unit according to the presence or absence of the digital broadcast audio signal or according to a user's selection; A control unit for generating a control signal; A digital Dolby signal processor for inputting an output signal of the switching unit and processing a Dolby signal in a digital manner; And And a digital / analog converter for converting the digital output signal of the digital Dolby signal processor into an analog signal. An apparatus for processing Dolby audio signals by demodulating analog broadcast audio signals demodulated and output from an analog broadcast audio processing block and decoded digital broadcast audio signals demodulated and decoded and output from a digital broadcast audio processing block, A digital / analog converter for converting the decoded digital broadcast audio signal into an analog signal and outputting the analog signal; A switching unit for inputting the output signal of the digital / analog converter to a first input terminal and the demodulated analog broadcast audio signal to a second input terminal, and selecting and outputting only one input terminal signal according to a switching control signal; A switch for determining whether the digital broadcast audio signal is received and for selecting one of the signals applied to the first and second input terminals of the switching unit according to the presence or absence of the digital broadcast audio signal or a user's selection. A control unit for generating a control signal; And And an analog Dolby signal processing unit for inputting an output signal of the switching unit and processing a Dolby signal by an analog method. The apparatus of claim 1 or 2, wherein the switching control signal of the controller determines whether the digital broadcast audio signal is received, and if the digital broadcast audio signal is detected, the decoded digital broadcast audio input from the input of the switching unit. Select and output a signal, and otherwise select and output the demodulated analog broadcast audio signal.