KR20080062216A - Apparatus for controlling dmb audio gain in porterble terminal - Google Patents

Apparatus for controlling dmb audio gain in porterble terminal Download PDF

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Publication number
KR20080062216A
KR20080062216A KR1020060137711A KR20060137711A KR20080062216A KR 20080062216 A KR20080062216 A KR 20080062216A KR 1020060137711 A KR1020060137711 A KR 1020060137711A KR 20060137711 A KR20060137711 A KR 20060137711A KR 20080062216 A KR20080062216 A KR 20080062216A
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KR
South Korea
Prior art keywords
volume
comparator
decoding
audio
signal
Prior art date
Application number
KR1020060137711A
Other languages
Korean (ko)
Inventor
김수연
Original Assignee
삼성전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020060137711A priority Critical patent/KR20080062216A/en
Publication of KR20080062216A publication Critical patent/KR20080062216A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/602—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for digital sound signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The present invention relates to an apparatus for controlling the volume of a DMB in a portable terminal, comprising: a low pass filter (LPF) for extracting a DC (direct current) component from speech data decoded and converted into an analog signal, and the low pass A comparator for outputting a high or low signal by comparing the DC value extracted from the filter with a predetermined reference voltage value, adjusting the decoding gain according to the signal input from the comparator, and adjusting the adjusted decoding gain Including a multimedia chip to decode the audio data by using, when the volume of the DMB broadcast is larger or smaller than the reference value and the volume is different for each broadcast can produce a sufficient and constant volume without damaging the speaker.

Description

DMB volume control device in portable terminal {APPARATUS FOR CONTROLLING DMB AUDIO GAIN IN PORTERBLE TERMINAL}

1 is a block diagram for outputting audio data of DMB in a portable terminal according to the prior art;

2 is a block diagram for outputting audio data of DMB in a portable terminal according to the present invention;

The present invention relates to an apparatus for controlling a DMV volume in a portable terminal, and more particularly, to an apparatus for adjusting the volume of a DMB by adjusting a decoding gain value in a multimedia chip.

Recently, as the use of portable terminals is gradually increased, portable terminals having various functions in addition to essential functions such as simple call function or data communication have been developed. In particular, recently, the multimedia function of the portable terminal is being emphasized, and accordingly, the portable terminal in which the multimedia chip is embedded is increasing. The multimedia chip supports audio and video data, and recently, a multimedia chip supporting DMB service has also been developed.

Types of sound sources of portable terminals include voices and MIDI files for basic phone functions, and in addition to these phone functions, there are sound sources of AAC (Advanced Audio Coding) and MP3 (MPEG layer 3) for entertainment.

These conventional sound sources are fixed by using hardware time constant values, and the software gain is adjusted for each sound source to adjust the appropriate volume.The sound sources have a fixed volume according to each format. In this way, it was possible to realize the maximum volume within the limits allowed by the speaker.

However, in the case of terrestrial DMB, the type of sound source is different for each broadcaster and program, and the size is not constant. Therefore, the volume of each broadcaster and program is uneven when playing on a portable terminal.

In the portable terminal according to the related art, the voice data of the terrestrial DMB is decoded into a decoding gain value in the multimedia chip 100 as shown in FIG. 1, and then converted into an analog signal through an audio codec 102, followed by an audio amplifier ( 104 is output to the speaker 106. In the above-described conventional technology, since the voice data is decoded only with a decoding gain value set as a default in the multimedia chip 100, it is impossible to maintain a different volume for each broadcaster and program for a constant volume. In addition, when using a fixed gain value as described above, when the user controls the volume based on the content with a large basic volume, the content with the small basic volume becomes too small and the content with the basic volume is reduced. When controlling the volume based on the reference, the content of which the basic volume is large has a problem that the output of the voice data is unstable because the output volume is too large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus for controlling a DMV volume in a portable terminal.

Another object of the present invention is to provide an apparatus for controlling a DMV volume using a low pass filter (LPF) and a comparator in a portable terminal.

Another object of the present invention is to provide an apparatus for controlling the DMV volume by adjusting the decoding gain value in the multimedia chip.

According to a first aspect of the present invention for achieving the above object, a device for controlling the volume of the DMB in a portable terminal, the low-pass filter for extracting the DC (direct current) component from the speech data decoded and changed into an analog signal ( LPF: a low pass filter, a comparator for outputting a high or low signal by comparing a DC value extracted from the low pass filter with a predetermined reference voltage value, and a signal input from the comparator. And a multimedia chip for adjusting the decoding gain and decoding the audio data using the adjusted decoding gain.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, an apparatus for controlling DMV volume by adjusting decoding gain in a multimedia chip using a low pass filter and a comparator in a portable terminal will be described.

2 is a block diagram of a portable terminal according to the present invention. The portable terminal includes a multimedia chip 200, an audio codec 202, an audio amplifier 204, a low pass filter 206, a comparator 208, and a speaker 210.

Referring to FIG. 2, the multimedia chip 200 is a chip for implementing multimedia functions such as music and video, and when a DMB service is received because a default decoding gain is set, The audio data and the video data are decoded using the decoding gain set as a default and output to the audio codec 202 and the video codec (not shown), respectively. In addition, according to the present invention, the multimedia chip 200 adjusts the decoding gain according to the value input from the comparator 208 and then decodes the voice data and outputs the decoded audio data to the audio codec 202. For example, the multimedia chip 200 maintains the default decoding gain value when a low signal is input from the comparator 208, and a high signal from the comparator 208 is maintained. When input, the decoding gain value is adjusted to produce a sufficient volume not to damage the speaker. Here, the default decoding gain is set high enough to output a sufficient volume to the speaker even when the content having the smallest basic volume is decoded and output. That is, the content having a small basic volume is decoded using the decoding gain set to be high, so that a volume having a sufficiently large size can be output, and the content having a large basic volume using a decoded gain reset to the output of the comparator. By decoding, by outputting a volume smaller than the basic volume it is possible to produce a sufficient volume without damaging the speaker (210).

The audio coder (Audio Coder-Decoder) 202 converts the voice data input from the multimedia chip 200 into an analog form and outputs it to the audio amplifier 204.

The audio amplifier 204 amplifies and outputs analog voice data input from the audio codec 202 to the speaker 210. The amplified analog voice data is output to the low pass filter 206 according to the present invention. Output

The low pass filter (LPF) 206 removes high frequency components or unnecessary components and extracts only DC (direct current) components from analog voice data input from the audio amplifier 204 according to the present invention. Output to comparator 208.

The comparator 208 includes a reference voltage (Vref) value to compare the DC value input from the low pass filter 206 with the reference voltage value so that the DC value is higher than the reference voltage value. ) And outputs a low signal to the multimedia chip 200 when the DC value is less than the reference voltage value. The reference voltage is defined as the limit of the speaker output.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention compares the DC value extracted from the low pass filter through the comparator with the reference voltage in the comparator and adjusts the decoding gain value by inputting the output value of the comparator to the multimedia chip when watching the DM broadcast in the portable terminal. Therefore, when the volume of the DMB broadcast is larger or smaller than the reference value and the volume is different for each broadcast, there is an effect that it is possible to produce a sufficient and constant volume without damaging the speaker.

Claims (6)

In the device for controlling the volume of the terrestrial DMB in a portable terminal, A low pass filter (LPF) for extracting DC components from speech data decoded and converted into analog signals; A comparator for outputting a high or low signal by comparing a DC value extracted from the low pass filter with a predetermined reference voltage value; And a multimedia chip for adjusting the decoding gain according to the signal input from the comparator and decoding the audio data using the adjusted decoding gain. The method of claim 1, The multimedia chip, And when a low signal is input from the comparator, decoding with a default decoding gain. The method of claim 1, The multimedia chip, And decoding the gain by adjusting the decoding gain when a high signal is input from the comparator. The method of claim 1, And the reference voltage is a limit value of a speaker output. The method of claim 1, The apparatus further comprises an audio output unit for converting and amplifying and outputting the audio data decoded in the multimedia chip to an analog signal The method of claim 5, The audio output unit, An audio codec for converting the decoded audio data into an analog signal, An audio amplifier for amplifying the data converted into the analog signal; And a speaker for outputting the amplified audio data.
KR1020060137711A 2006-12-29 2006-12-29 Apparatus for controlling dmb audio gain in porterble terminal KR20080062216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020060137711A KR20080062216A (en) 2006-12-29 2006-12-29 Apparatus for controlling dmb audio gain in porterble terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020060137711A KR20080062216A (en) 2006-12-29 2006-12-29 Apparatus for controlling dmb audio gain in porterble terminal

Publications (1)

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KR20080062216A true KR20080062216A (en) 2008-07-03

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KR1020060137711A KR20080062216A (en) 2006-12-29 2006-12-29 Apparatus for controlling dmb audio gain in porterble terminal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130058492A (en) * 2011-11-25 2013-06-04 주식회사 케이티 Method for accessing media chipset of application, and user device thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130058492A (en) * 2011-11-25 2013-06-04 주식회사 케이티 Method for accessing media chipset of application, and user device thereof

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