KR20170002245A - Signal Processing Unit, Sound Source playing Device and Method using the same - Google Patents

Signal Processing Unit, Sound Source playing Device and Method using the same Download PDF

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KR20170002245A
KR20170002245A KR1020150092545A KR20150092545A KR20170002245A KR 20170002245 A KR20170002245 A KR 20170002245A KR 1020150092545 A KR1020150092545 A KR 1020150092545A KR 20150092545 A KR20150092545 A KR 20150092545A KR 20170002245 A KR20170002245 A KR 20170002245A
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South Korea
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signal
sound source
unit
audio data
data
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KR1020150092545A
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Korean (ko)
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KR101746115B1 (en
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정철우
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주식회사 아이리버
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
    • G11B20/10231—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation wherein an asynchronous, free-running clock is used; Interpolation of sampled signals

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  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

The present invention relates to a signal processing unit capable of reducing noise degradation by improving the transmission of audio data or signals in a sound source reproduction process, and a sound source reproducing apparatus and method using the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing unit, a sound source playing device using the same,

An embodiment of the present invention relates to a signal processing unit, a sound source reproducing apparatus using the same, and a method.

Generally, a sound source reproducing apparatus is a device for reproducing a sound source file, in which a central processing unit (CPU) or an application processor (AP) of a sound source reproducing apparatus is connected to a sound source The file is loaded. Thereafter, the CPU or the AP converts the sound source file into an analog type signal so that the output device can output the sound source file to the outside through a series of processes, and the output device outputs the analog type signal to the outside, Playback.

As one of the methods of the above-mentioned series of processes, the sound source file may be converted into PCM (Pulse Code Modulation) data, and the PCM data may be converted into a signal compliant with the I2S (Integrated Interchip Sound) method and transmitted to the converter.

The I2S method is a standard communication method for digital audio devices established by Philips. The I2S system analyzes the digital audio signal, converts the analyzed digital audio signal into at least three signals, and transmits the signals to the converter. The three signals conforming to the I2S scheme are serial clock (SCK), sound data (SD), and clock (WS) for discrimination of output devices.

A sound source reproduction apparatus using the I2S scheme converts a digital audio signal from the CPU or the AP into signals according to the I2S scheme and transmits these signals to the converter. In order to transmit three signals according to the I2S scheme to the converter, the CPU or AP and the converter can be connected by three signal lines.

According to the I2S system, at least three signals must be transmitted through three signal lines as described above, and the synchronization of the three signals is essential. That is, the CPU or AP generates the SCK, SD, and WS signals conforming to the I2S scheme based on the audio data, and transmits these signals to the converter in synchronization.

However, in order for the CPU or the AP to synchronize the signals, a separate firmware is required for synchronization. If the synchronization is not properly performed, noise may occur during sound source reproduction, sound reproduction may be cut off, There was a problem.

The main object of the present invention is to provide a signal processing unit capable of reducing noises and preventing degradation of sound quality by improving a sound source reproducing method, and a sound source reproducing apparatus and method using the same.

 A sound source reproducing apparatus for reproducing a sound source file stored in a sound source reproducing apparatus using a SPDIF (Sony Philips Digital Interconnect Format) signal transmission method according to an embodiment of the present invention, A decoding unit for converting the audio data into PCM data according to the reproduction information, a conversion unit for converting the PCM data into a first signal conforming to the SPDIF signal transmission scheme, an I2S (Integrated Interchip Sound) format, a converter for converting the second signal into an analog signal, and an amplifier for amplifying the analog signal.

In the present invention, the reproduction information may include at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth.

In the present invention, the analyzing unit may obtain the reproduction information and the audio data by parsing the sound source file.

In the present invention, when the audio data is compressed, the decoding unit decompresses the audio data, and decodes the decompressed audio data to convert the decoded audio data into the PCM data.

In the present invention, the converting unit may package the reproduction information and the PCM data into a Biphase signal to generate the first signal.

In the present invention, the transceiver may analyze the first signal to generate the PCM data, the serial clock, or the ELCLK.

In the present invention, the transceiver may synchronize the PCM data, the serial clock, or the ELCLK.

In the present invention, the serial clock may indicate the transmission timing of the PCM data, and the ELCLOCK may indicate the timing of selecting the right and left outputs of the sound reproducer.

In the present invention, the conversion unit may be connected to the transmission / reception unit via a signal line to transmit the first signal to the transmission / reception unit.

In the present invention, the sound source reproduction apparatus may include a signal processing apparatus, and the signal processing apparatus may include the analysis unit, the decoding unit, and the conversion unit.

In the present invention, the signal processor may be connected to the transmitter / receiver through a signal line to transmit the first signal to the transmitter / receiver.

In the present invention, the sound source reproduction apparatus may include a signal processing apparatus, and the signal processing apparatus may include the analysis unit and the decoding unit, and the conversion unit may be configured separately from the signal processing apparatus.

In the present invention, the conversion unit may be connected to the transmission / reception unit via a signal line to transmit the first signal to the transmission / reception unit.

A signal processing unit for converting a sound source file stored in a sound source reproducing apparatus according to an embodiment of the present invention into an SPDIF signal according to the SPDIF signal transmission method, A decoder for converting the audio data into pulse code modulated data according to the reproduction information, and a converter for converting the pulse code modulated data into an SPDIF signal according to the SPDIF signal transmission scheme.

In the present invention, the reproduction information may include at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth.

In the present invention, the analyzing unit may obtain the reproduction information and the audio data by parsing the sound source file.

In the present invention, when the audio data is compressed, the decoding unit decompresses the audio data, and decodes the decompressed audio data to convert the decoded audio data into the pulse code modulated data.

In the present invention, the converting unit may package the reproduction information and the pulse code modulated data into a biphase signal and convert the same into the SPDIF signal.

There is provided a method for reproducing a sound source file stored in a sound source reproducing apparatus using an SPDIF signal transmission method according to an embodiment of the present invention, the method comprising the steps of: analyzing the sound source file and acquiring the sound source file as reproduction information and audio data; Converting the audio data into pulse code modulated data according to reproduction information, converting the pulse code modulated data into a first signal conforming to the SPDIF signal transmission scheme, converting the first signal into a second signal conforming to the I2S format Converting the second signal into an analog signal, and amplifying the analog signal.

In the present invention, the reproduction information may include at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth.

In the present invention, the first code signal may be generated by packaging the pulse code modulated data into a biphase signal.

The method may further include analyzing the first signal to extract the pulse code modulated data, the serial clock or the EL clock, and synchronizing the pulse code modulated data, the serial clock or the EL clock have.

According to an embodiment of the present invention, when a sound source is reproduced, generation of noise can be suppressed and sound quality degradation can be prevented.

1 is a diagram schematically showing a configuration of a sound source reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing a configuration of a sound source reproducing apparatus according to another embodiment of the present invention.
FIG. 3 is a diagram schematically showing a configuration of a sound source reproducing apparatus according to another embodiment of the present invention.
FIG. 4 is a flowchart illustrating a sound source reproduction method according to an embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not to be limited to the specific embodiments, but includes all changes, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred. In addition, numbers used in the description process of the present invention (e.g., first second, etc.) may be identifier signals for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, As long as the opposite substrate does not exist, it may be connected or connected via another component in the middle.

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

FIG. 1 is a diagram schematically showing a configuration of a sound reproducing apparatus 100 according to an embodiment of the present invention.

1, a sound reproduction apparatus 100 according to an exemplary embodiment of the present invention includes an analysis unit 110, a decoding unit 120, a conversion unit 130, a transmission / reception unit 140, a converter unit 150, And an amplification unit 160, as shown in FIG.

The analysis unit 110 may analyze the sound source file stored in the storage unit of the sound source reproduction apparatus and acquire it as reproduction information and audio data. At this time, the reproduction information may include at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth.

The analysis unit 110 may analyze the sound source file using parsing and acquire it as reproduction information and audio data so that the decoding unit 120 can decode the sound source file.

Parsing generally refers to a task of refining, analyzing or analyzing a file to process the file so that the file can be used by an application program, and then newly configuring the file according to the type of the application program.

The analysis unit 110 may extract playback information and audio data from the sound source file so that the decoding unit 120 may process the sound source file by parsing the sound source file.

The decoding unit 120 may convert the audio data into pulse code modulation (PCM) data according to the reproduction information.

The decoding unit 120 receives the reproduction information and the audio data extracted by the analysis unit 110 from the analysis unit 110 and decodes the audio data according to the reproduction information to generate the PCM data Can be converted.

The audio data may be compressed in accordance with the format of the sound source file, for example, MPEG Audio Layer-3 (MP3), Free Lossless Audio Codec (FLAC) For example, a WAV, an audio interchange file format (AIFF), or the like. If the audio data is in the compressed format, the decoding unit 120 may decompress the audio data, and may decode the decompressed audio data and convert the decompressed audio data to the PCM data. On the other hand, when the audio data is not compressed, the decoding unit 120 decodes the audio data transmitted from the analysis unit 110 without decoding the audio data, and converts the audio data into the PCM data .

The conversion unit 130 may convert the PCM data into a first signal conforming to the Sony Philips Digital Interconnect Format (SPDIF) signal transmission scheme. The conversion unit 130 may package the reproduction information and the PCM data into a biphase signal and convert the same into a first signal.

SPDIF signal transmission method is digital input / output specification of audio data specified by Sony and Philips. The SPDIF signal transmission method is generally used for digital audio devices such as a digital video disk (DVD), a digital audio recorder (DAT), a home theater or an audio processing device and transmits digital audio data as it is. It does not happen.

The conversion unit 130 may package the reproduction information and the PCM data into a biphase signal and convert the same into the first signal, thereby preventing deterioration in sound quality due to noise generated in a conventional sound reproduction apparatus.

The transceiver 140 may analyze the first signal and convert the first signal into a second signal according to the I2S format. That is, the transceiving unit 140 analyzes the first signal packaged in the biphase signal to obtain the reproduction information and the PCM data, and based on the PCM data, generates a sound data signal SD), and generates a serial clock (SCK) and a word select (WS) among the second signals conforming to the I2S format based on the reproduction information. The transceiver 140 may also transmit the serial data signals SD, SCK, and WS to the converter 150 in synchronization. Here, SCK is a signal indicating the transmission timing of the PCM data, and WS is a signal indicating the clock timing for selecting the right and left outputs of the sound reproduction apparatus 100 according to the embodiment of the present invention.

The transceiver 140 transmits the sound data signal to the converter 150 through the sound data line 141 by synchronizing the time of transmitting the sound data signals SCK and WS and the SCK is connected to the serial clock line 142 To the converter unit 150, and WS can be transmitted to the converter unit via the WS line 143. [ The transceiver 140 may be a WM8804 transceiver as a specific example.

The transceiver 140 may be connected to the converter 130 via a single connection line. In a conventional sound reproduction apparatus, when a central processing unit (CPU) or an application processor (AP) converts sound source files into PCM data and transmits them to the converter unit, the CPU or AP converts the PCM data into an I2S system Converted into a signal to be transmitted and directly transmitted to the converter section. In this case, in order to transfer the SCK, the sound data (SD), or the WS to the converter section, at least three signal lines for transferring each between the central processing unit (or application processor) and the converter are required, To the converter. However, in order for the CPU or the AP to synchronize the signals, a separate firmware is required for synchronization. If the synchronization is not properly performed, noise may occur during sound source reproduction, sound reproduction may be cut off, There was a problem.

However, the sound reproduction apparatus 100 according to an embodiment of the present invention may be configured such that the conversion unit 130 packages the PCM data into a biphase signal, converts the biped signal into a first signal according to a single signal SPDIF signal transmission scheme, 140, the three connection lines required by the CPU or the AP of the conventional sound reproduction apparatus are not required, and are connected to the transmission / reception unit 140 by only one single connection line. The synchronization is not performed by the conversion unit 130 Reception unit 140. The firmware of the CPU or the AP is not required for synchronization of the I2S signal, and noise due to asynchronization of these signals is not generated, so sound quality degradation can be prevented. In particular, when a high-quality sound source is reproduced, deterioration in sound quality that can occur due to non-synchronization of the I2S signal can be minimized.

The converter unit 150 may convert the second signal into an analog signal. For example, the converter unit 150 may convert the second signal, which is the sound data, the SCK, or the WS, received from the transceiver 140 into an analog signal within an audible frequency range that can be heard by a person. The converter unit 150 may be a digital to analog converter (DAC), and may be, for example, a WM8740 DAC. The converter unit 150 may convert the sound data into an analog signal according to the SCK or WS transmitted from the transceiver unit 140. [

The amplification unit 160 may amplify the analog signal. Specifically, the amplification unit 160 may be an amplification circuit including an amplifier, and may amplify the analog signal transmitted from the converter unit 150.

The frequency of the analog signal converted from the sound source file through the analyzer 110, the decoder 120, the converter 130, the transmitter-receiver 140, and the converter 150 is in the range of audible frequency, The amplitude of the converted analog signal is low because the voltage used by the digital signal processor 110, the decoding unit 120, the conversion unit 130, the transmission / reception unit 140, and the converter unit 150 is a low voltage of 5 V or less The sound outputted to the output device connected to the sound reproducing device 100 and outputting sound to the outside is very small. However, the amplification unit 160 amplifies the low-amplitude analog signal as described above and converts it into an analog signal of a human audible amplitude, so that the user can hear the sound source reproduced through the output apparatus.

2 is a diagram schematically showing a configuration of a sound reproducing apparatus 200 according to another embodiment of the present invention.

2, a sound source reproduction apparatus 200 according to another embodiment of the present invention includes a signal processing unit 210, a conversion unit 220, a transmission / reception unit 230, a converter unit 240, 250).

The signal processing unit 210 may perform the main control of the sound reproduction apparatus 200 according to another embodiment of the present invention. Specifically, the signal processing unit 210 can perform operations that the sound reproduction apparatus 200 can perform, for example, invoke, create, delete, fast forward, shuffle, reverse, It is possible to perform not only the same operations but also operations such as classification according to the type of the sound source file and category classification according to the atmosphere of the sound source recorded in the sound source. For example, the signal processing unit 210 may be a CPU or an AP.

Also, the signal processing unit 210 may process the sound source file stored in a storage unit (not shown) of the sound reproducing apparatus 200. That is, the signal processing unit 210 can acquire reproduction information and audio data of the sound source file by parsing the sound source file transmitted from the storage unit. Then, the signal processing unit 210 can convert the audio data into PCM data according to the obtained reproduction information. In other words, the signal processing unit 210 may decode the audio data according to the reproduction information and convert the decoded audio data into the PCM data.

The signal processing unit 210 can decompress the audio data obtained from the sound source file and convert the decompressed audio data into the PCM data when the sound source file is in a compressed form. On the other hand, when the audio data is not compressed, the signal processing unit 210 can decode the audio data as it is without converting the audio data into the PCM data without decompressing the audio data.

The signal processing unit 210 may include an analyzing unit 211 and a decoding unit 212 as an example. The analysis unit 211 analyzes the sound source file using parsing as in the analysis unit 110 shown in FIG. 1 and outputs the reproduced information and the audio data to the decoding unit 212 so that the decoding unit 212 can decode the sound source file. And the decoding unit 212 receives the reproduction information and the audio data extracted by the analysis unit 211 from the analysis unit 211 like the decoding unit 212 shown in FIG. 1, The audio data may be decoded according to the reproduction information and converted into the PCM data.

The reproduction information and the PCM data converted in the signal processing unit 210 are transmitted to the conversion unit 220 and the conversion unit 220 can convert the PCM data into a first signal conforming to the SPDIF signal transmission scheme. More specifically, the conversion unit 220 may package the reproduction information and the PCM data into a biphase signal and convert the same into a first signal.

The transceiving unit 230 can convert the first signal transmitted from the signal processing unit 210 into a second signal according to the I2S format. That is, the transceiving unit 230 analyzes the first signal packaged in the biphase signal to obtain the reproduction information and the PCM data, and outputs the sound data signal (i. E. SD), and generates a serial clock (SCK) and a word select (WS) among the second signals conforming to the I2S format based on the reproduction information. The transceiver 230 may also transmit the serial data signals SD, SCK, and WS in synchronization to the converter 240.

As described above, the sound reproducing apparatus 200 according to another embodiment of the present invention converts the PCM data into a biphase signal and converts it into a first signal according to a single signal SPDIF signal transmission method, Signal unit 210 for synchronizing the second signals by generating and synchronizing second signals conforming to the I2S format in the transceiver unit 230 separately configured from the signal processing unit 210. [ Firmware is not required and the problem that the I2S signals are unsynchronized by the firmware can be prevented in advance, so that noise due to asynchronization of these signals does not occur, and sound quality degradation can be prevented. In particular, when a high-quality sound source is reproduced, deterioration in sound quality that can occur due to non-synchronization of the I2S signal can be minimized.

The converter unit 240 can convert the second signal into an analog signal. For example, the converter 240 may convert the second signal, which is the sound data, SCK, or WS, received from the transmitter / receiver 230 into an analog signal within an audible frequency range that can be heard by a person. The converter unit 240 may be a digital to analog converter (DAC), and may be, for example, a WM8740 DAC. The converter unit 240 can convert the sound data into an analog signal according to the SCK or WS transmitted from the transceiver unit 230. [

The amplification unit 250 can amplify the analog signal. Specifically, the amplification unit 250 may be an amplification circuit including an amplifier, and may amplify the analog signal transmitted from the converter unit 240.

3 is a diagram schematically showing a configuration of a sound reproducing apparatus 300 according to another embodiment of the present invention.

3, the sound reproduction apparatus 300 according to another embodiment of the present invention includes a signal processing unit 310, a transmission / reception unit 320, a converter unit 330, and an amplification unit 340 have.

The signal processing unit 310 may perform main control of the sound reproduction apparatus 300 according to another embodiment of the present invention. Specifically, the signal processing unit 310 can perform operations that the sound reproduction apparatus 300 can perform, for example, invoke, create, delete, fast forward, shuffle, reverse, It is possible to perform not only the same operations but also operations such as classification according to the type of the sound source file and category classification according to the atmosphere of the sound source recorded in the sound source. For example, the signal processing unit 310 may be a CPU or an AP.

The signal processing unit 310 may process the sound source file stored in a storage unit (not shown) of the sound reproducing apparatus 300. That is, the signal processing unit 310 can acquire reproduction information and audio data of the sound source file by parsing the sound source file transmitted from the storage unit. The signal processing unit 310 may then convert the audio data into PCM data according to the obtained reproduction information. In other words, the signal processing unit 310 may decode the audio data according to the reproduction information and convert the decoded audio data into the PCM data.

The signal processing unit 310 can decompress the audio data obtained from the sound source file and convert the decompressed audio data into the PCM data if the sound source file is in a compressed form. On the other hand, when the audio data is not compressed, the signal processing unit 310 can decode the audio data as it is without converting the audio data into the PCM data.

Subsequently, the signal processing unit 310 may convert the PCM data into a first signal conforming to the SPDIF signal transmission scheme. More specifically, the signal processing unit 310 may package the reproduction information and the PCM data into a biphase signal and convert the same into a first signal.

The signal processing unit 310 may include an analyzing unit 311, a decoding unit 312, and a converting unit 313 as an example. The analysis unit 311 analyzes the sound source file using parsing as in the analysis unit 110 shown in FIG. 1 and outputs the playback information and the audio data to the decoding unit 312 so that the decoding unit 312 can decode the sound source file. And the decoding unit 312 receives the reproduction information and the audio data extracted by the analysis unit 311 from the analysis unit 311 like the decoding unit 120 shown in FIG. 1, The audio data may be decoded according to the reproduction information and converted into the PCM data. The converting unit 313 may convert the PCM data into a first signal conforming to the SPDIF signal transmission scheme, like the converting unit 130 shown in FIG. The converting unit 313 may package the reproduction information and the PCM data into a biphase signal and convert the same into a first signal.

The transceiver 320 may convert the first signal transmitted from the signal processing unit 310 into a second signal according to the I2S format. That is, the transceiving unit 320 analyzes the first signal packaged in the biphase signal to obtain the reproduction information and the PCM data, and based on the PCM data, generates a sound data signal SD), and generates a serial clock (SCK) and a word select (WS) among the second signals conforming to the I2S format based on the reproduction information. The transceiver 320 may also transmit the serial data signals SD, SCK, and WS in synchronization to the converter 330.

As described above, the sound source reproducing apparatus 300 according to another embodiment of the present invention is configured such that the signal processing unit 310 packages the PCM data into a biphase signal, converts the PCM data into a first signal according to a single signal SPDIF signal transmission scheme A signal processing unit 210 for synchronizing the second signals by generating and synchronizing second signals conforming to the I2S format in the transmission / reception unit 320 separately configured from the signal processing unit 310, It is possible to prevent the I2S signals from being synchronized in advance by the firmware. As a result, noise due to asynchronization of these signals does not occur and sound quality degradation can be prevented. In particular, when a high-quality sound source is reproduced, deterioration in sound quality that can occur due to non-synchronization of the I2S signal can be minimized.

The converter unit 330 may convert the second signal into an analog signal. For example, the converter unit 330 may convert the second signal, which is the sound data, SCK, or WS, received from the transceiver 320, into an analog signal within an audible frequency range that can be heard by a human. The converter unit 330 may be a digital to analog converter (DAC), and may be, for example, a WM8740 DAC. The converter unit 330 may convert the sound data into an analog signal according to the SCK or WS transmitted from the transceiver 320. [

The amplification unit 340 can amplify the analog signal. Specifically, the amplification unit 340 may be an amplification circuit including an amplifier, and may amplify the analog signal transmitted from the converter unit 240.

4 is a flowchart illustrating a sound source reproducing method (S500) according to an embodiment of the present invention.

The sound source reproducing method (S500) according to an embodiment of the present invention can be used in a sound source reproducing apparatus for reproducing a sound source file stored in a sound source reproducing apparatus by using the SPDIF signal transmission method.

Referring to FIG. 4, a sound source reproduction method (S500) according to an embodiment of the present invention calls a sound source file stored in the sound source reproduction devices (100, 200, 300) (S510).

The analysis units 110, 211, and 311 analyze the called sound source file and acquire the sound source file as playback information and audio data (S520).

The decoding units 120, 212, and 312 determine whether the audio data is compressed (S530). If the audio data is compressed, the decoding units 1202 and 312 decompress the audio data (S540). The decoding units 120, 212, and 312 decode the audio data and convert them into PCM data (S550).

The conversion units 130, 220 and 313 receive the PCM data from the decoding units 120, 212 and 312, package the PCM data into a biphase signal, and convert the PCM data into a first signal conforming to the SPDIF signal transmission scheme ).

The transmission and reception units 140, 230, and 320 receive the first signal from the conversion units 130, 220, and 313 and analyze the first signal to divide the first signal into PCM data, a serial clock, And generates a signal (S570a). The transceivers 140, 230, and 320 synchronize the second signal (S570b).

The converter units 150, 240, and 330 receive the second signal from the transceiver units 140, 230, and 320 and convert the received second signal into an analog signal (S580).

The amplifying units 160, 250, and 340 receive the analog signals from the converter units 150, 240, and 330 and amplify the analog signals (S590).

Conventional sound source reproduction apparatuses directly input PCM data in the central processing unit to the converter by the I2S method. In this way, in order to input directly to the converter by I2S method, it is required to input SCK (Serial Clock), SD (Sound Data or Serial Data), or WS (Word Select). However, in the conventional sound source reproduction apparatus, when the PCM data is input directly to the inverter by the I2S method, the SCK, SD, or WS input through the three connection lines must be synchronized. However, there has been a problem in that noise is generated when synchronization is performed or synchronization is not properly performed, and sound reproduction is interrupted in severe cases, resulting in deterioration of sound quality.

As described above, the sound source reproducing apparatuses 100, 200 and 300 and the sound source reproducing method S500 according to the present invention convert the PCM data into the SPDIF signal by the converting units 130, 220 and 313, To the transmission / reception units 140, 230 and 320 so that the synchronization can be performed without SCK, SD, or WS. As a result, noise is not generated, deterioration of sound quality is prevented, and high quality sound can be reproduced.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100, 200, 300: Sound reproduction equipment
110, 211, 311, 410: Analysis section
120, 212, 312, 420: decoding unit
130, 220, 313, and 430:
140, 230, 320: Transmitting /
150, 240, and 330:
160, 250 and 340:
400: signal processing unit

Claims (22)

A sound source reproducing apparatus for reproducing a sound source file stored in a sound source reproducing apparatus using a SPDIF (Sony Philips Digital Interconnect Format) signal transmission method,
An analysis unit for analyzing the sound source file to obtain reproduction information and audio data;
A decoding unit for converting the audio data into PCM data according to the reproduction information;
A conversion unit for converting the PCM data into a first signal conforming to the SPDIF signal transmission scheme;
A transceiver for converting the first signal into a second signal conforming to I2S (Integrated Interchip Sound) format;
A converter for converting the second signal into an analog signal; And
An amplifier for amplifying the analog signal; And the sound source reproducing apparatus comprises: The method according to claim 1,
Wherein the reproduction information includes at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth. The method according to claim 1,
Wherein the analyzing unit parses the sound source file to obtain the reproduction information and the audio data. The method according to claim 1,
Wherein the decoding unit decompresses the audio data when the audio data is compressed, and decodes the decompressed audio data to convert the decompressed audio data into the PCM data. The method according to claim 1,
Wherein the conversion unit packages the reproduction information and the PCM data into a Biphase signal to generate the first signal. The method according to claim 1,
Wherein the transceiver analyzes the first signal to generate the PCM data, the serial clock, or the CL clock. The method according to claim 6,
Wherein the transmission / reception unit synchronizes the PCM data, the serial clock, or the CL clock. The method according to claim 6,
Wherein the serial clock represents a transmission timing of the PCM data, and the ELCLOCK represents a timing of selecting a left and right output of the sound reproduction apparatus. The method according to claim 1,
Wherein the conversion unit is connected to the transmission / reception unit via a signal line to transmit the first signal to the transmission / reception unit. The method according to claim 1,
Wherein the sound source reproducing apparatus includes a signal processing apparatus, and the signal processing apparatus includes the analyzing unit, the decoding unit, and the converting unit. 11. The method of claim 10,
Wherein the signal processor is connected to the transmitter / receiver through a signal line to transmit the first signal to the transmitter / receiver. The method according to claim 1,
Wherein the sound reproducer comprises a signal processor and the signal processor includes the analyzer and the decoder, and the converter is configured separately from the signal processor. 13. The method of claim 12,
Wherein the conversion unit is connected to the transmission / reception unit via a signal line to transmit the first signal to the transmission / reception unit. A signal processing unit for converting a sound source file stored in a sound source reproduction device into an SPDIF signal conforming to the SPDIF signal transmission method,
An analysis unit for analyzing the sound source file and obtaining the sound source file as reproduction information and audio data;
A decoding unit for converting the audio data into pulse code modulated data according to the reproduction information; And
A converter for converting the pulse code modulated data into an SPDIF signal according to the SPDIF signal transmission scheme; And a signal processing unit for processing the signal. 15. The method of claim 14,
Wherein the reproduction information includes at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth. 15. The method of claim 14,
Wherein the analysis unit parses the sound source file to acquire the reproduction information and the audio data. 15. The method of claim 14,
Wherein the decoding unit decompresses the audio data when the audio data is compressed, and decodes the decompressed audio data to convert the decompressed audio data into the pulse code modulated data. 15. The method of claim 14,
Wherein the conversion unit packages the reproduction information and the pulse code modulated data into a biphase signal and converts the same into the SPDIF signal. A method for reproducing a sound source file stored in a sound source reproducing apparatus using an SPDIF signal transmission method,
Analyzing the sound source file and acquiring the sound source file as reproduction information and audio data;
Converting the audio data into PCM data according to the reproduction information;
Converting the PCM data into a first signal conforming to the SPDIF signal transmission scheme;
Converting the first signal into a second signal conforming to the I2S format;
Converting the second signal to an analog signal; And
Amplifying the analog signal; And reproducing the reproduced sound. 20. The method of claim 19,
Wherein the reproduction information includes at least one of a sampling rate of the sound source file, a bit rate per sample, a bit rate per second, or a bit depth. 20. The method of claim 19,
And packaging the PCM data into a biphase signal to generate the first signal. 20. The method of claim 19,
Analyzing the first signal to extract the PCM data, a serial clock or an ELCLK; Wow
Synchronizing the PCM data, the serial clock, or the CL clock; And reproducing the sound source.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US11120810B2 (en) * 2018-12-06 2021-09-14 Yi-Jou Wang Recording device
KR102346697B1 (en) * 2020-11-03 2021-12-31 (주)드림어스컴퍼니 Method and Apparatus for outputting Sound source applying multiple DACs
WO2022186470A1 (en) * 2021-03-04 2022-09-09 삼성전자 주식회사 Audio processing method and electronic device including same

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Publication number Priority date Publication date Assignee Title
KR200344261Y1 (en) * 2003-12-09 2004-03-10 주식회사 빅빔 MP3 player for recording of sound regenerated in PC
JP2007300450A (en) * 2006-05-01 2007-11-15 Seiko Epson Corp Clock-generating circuit, information reproducing device, electronic apparatus, and method for the designing clock-generating circuit
CN104581522A (en) * 2013-10-24 2015-04-29 西安群丰电子信息科技有限公司 High-definition lossless audio playing system (HDAP)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11120810B2 (en) * 2018-12-06 2021-09-14 Yi-Jou Wang Recording device
KR102346697B1 (en) * 2020-11-03 2021-12-31 (주)드림어스컴퍼니 Method and Apparatus for outputting Sound source applying multiple DACs
WO2022186470A1 (en) * 2021-03-04 2022-09-09 삼성전자 주식회사 Audio processing method and electronic device including same

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