JP2002057995A - High-speed digital interface, signal transmitter, and signal receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-speed digital interface that can realize transmission of additional channels through the use of a cable and a connector having the same shape and physical structural information as those of an existing interface and can realize transmission of additional channels (audio data) without the need for adjustment of signal period relations and without giving effect on transmission of a substantial image signal. SOLUTION: A transmission side is provided with a synthesis signal output means that outputs a synthesis signal resulting from adding an audio signal to an image signal as a common mode signal and a reception side is provided with a signal extract means that extracts the audio signal added to the image signal as the common mode signal from the synthesis signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed digital interface device for transmitting an image signal and an audio signal between a transmitting side and a receiving side.

[0002]

2. Description of the Related Art FIG. 7 shows a DVI (Digital Video Interface).
e) is a diagram showing a configuration of a conventional high-speed digital interface device used in specification version 1.0. In FIG. 7, reference numeral 701 denotes a transmitter. 7
Reference numerals 011 and 7012 denote switching means for modulating input data (channel V0). Reference numeral 7013 denotes a current source connected to the switching units 7011 and 7012. 702 is a receiver. 7021, 7
022 is a resistance connected as a load to the twisted pair transmission line Z0. Reference numeral 7023 denotes a differential amplifier for differentially amplifying a signal appearing on a twisted pair.

Next, the operation will be described. In the transmitter 701, the modulation signal of the input data (channel V0) is transmitted by modulating the switching means 7011 and 7012 in opposite phases. Transmission line Z0
Is a twisted pair with high impedance. As a whole, in order to reduce the influence of the signal amplitude, the current source 7013 is used so that the rising amplitude and the falling amplitude of the signal do not become too large. When a signal is supplied to the receiver 702 through the transmission path Z0, currents are respectively sunk via the resistors 7021 and 7022, and the signal is differentially amplified by the differential amplifier 7023 and output.

[0004]

The conventional high-speed digital interface device shown in FIG. 7 is used for transmitting image data, and cannot be used as it is for transmitting audio data together. .

As a method of adding audio data transmission, A: a method in which a twisted pair is separately added for an audio channel to make an additional more channel, and B: an existing channel as shown in FIG. A method of multiplexing and transmitting a new more channel can be considered. However, in the method A, since the shape of the cable and the shape of the connector are respectively changed, there is a problem that the connection between the existing device and the newly added device cannot be performed, that is, the device is incompatible. In the method B, since the existing channel is time-divided, there is no problem if there is a vacant time. However, if it is not, there is a problem such as a reduction in the overall rate due to the time division, which is not preferable. Further, there is a problem that a restriction is caused by a relationship between a peculiar cycle of the image data as the original signal and a cycle of the signal of the added audio channel.

The present invention has been made in order to solve the above-mentioned problems, and can realize transmission of an additional channel using a cable and a connector having the same shape and physical structure information as existing equipment. It is an object of the present invention to provide a high-speed digital interface device that does not require adjustment of the signal cycle relationship and can transmit an additional channel (audio data) without affecting transmission of an image signal as an original signal. .

[0007]

To solve the above-mentioned problems, the present invention (claim 1) is a high-speed digital interface device for transmitting an image signal and an audio signal between a transmitting side and a receiving side. A synthesizing signal output means for outputting a synthesized signal obtained by adding an audio signal to the image signal as an in-phase signal on the transmission side; and a signal extraction for extracting an audio signal added as an in-phase signal from the synthesized signal on the receiving side. Means.

According to a second aspect of the present invention, there is provided a signal transmitting apparatus for transmitting an image signal and an audio signal, wherein the combined signal output means outputs a composite signal obtained by adding an audio signal to the image signal as an in-phase signal. It is characterized by having.

According to a third aspect of the present invention, there is provided a signal receiving apparatus for receiving an image signal and an audio signal, comprising: receiving a composite signal obtained by adding an audio signal to an image signal as an in-phase signal; And a signal extracting means for extracting a voice signal added as an in-phase signal from the audio signal.

According to a fourth aspect of the present invention, there is provided a high-speed digital interface device according to the first aspect.
Synthesized signal output means for outputting a synthesized signal obtained by adding an audio signal as an in-phase signal to an image signal has different amplitudes of the image signal and the audio signal.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Next, an embodiment of the present invention will be described. FIG. 1 shows Embodiment 1 of the present invention.
1 is a diagram showing a configuration of a high-speed digital interface device according to the present invention. In FIG. 1, reference numeral 101 denotes a transmitter. Reference numerals 1011 and 1012 denote switching means for modulating input image data (channel V0). 1
013 is a current source connected to the switching means 1011 and 1012. 102 is a receiver.
Reference numerals 1021 and 1022 denote resistors connected as loads to the twisted pair transmission path Z0. Reference numeral 1023 denotes a differential amplifier that differentially amplifies a signal appearing on the twisted pair. Reference numeral 103 denotes a transmitter for audio data. Reference numeral 1031 denotes switching means for modulating input audio data (channel A0). 1033 is a current source connected to the switching means 1031. Reference numeral 104 denotes an audio data receiver, and reference numeral 1041 denotes an in-phase input receiver amplifier.

In this embodiment, an audio signal additionally transmitted is supplied from a channel A0, modulated by a transmitter 103, a signal 105 is supplied to a transmitter 101, and a superimposed signal is transmitted to a receiver via a transmission line Z0. 102 and 104.

This will be described in more detail. The audio data supplied to the channel A0 is
31 is driven to perform modulation as a change in the current value drawn by the current source 1033. The change in current is coupled to transmitter 101 as signal 105 and contributes as a change in overall current.

Next, the operation of superimposing signals will be described.
When the switching means 1031 is closed, current is sunk by the current source 1033. Since the switching means 1011 and the switching means 1012 operate complementarily, one of them is always closed. Therefore, the current from the receiver 102 serving as a load for supplying the current is sunk via one of the switching units 1011 and 1012, and
When the switching means 1031 is on, the current of the sum of the current source 1033 and the current source 1013 is eventually sinked. When the switching means 1031 is open, the current source 1
There is no sink 033, and only the current value of the current source 1013 is sinked. In other words, the contribution of the audio data is superimposed over the entire current source 1033 by the control of the switch means 1031.

As for the image signal data, the switching means 1011 and 1012 operate complementarily, and each of the twisted pairs complementarily sinks current, and the value of the sinked current increases or decreases due to superposition by the audio channel. , And each of the twisted pairs operates based solely on the operation of a current meter addition. That is, signal 1 which is a sync signal based on audio data (channel A0) added as a more channel
05 is superimposed on the transmission system of the image signal data as an in-phase signal.

Next, the receiver will be described. In the image signal (video signal) receiver 102, the signals on the transmission lines 106 and 107 are amplified by the differential amplifier 1023. The differential amplifier 1023 outputs signals 106 and 1
The operation of canceling the in-phase part 07 is performed. Therefore, the audio signal component of the channel A0, which is an in-phase signal, does not appear on the output channel V1 of the differential amplifier 1023. On the other hand, the receiver amplifier 1041 of the receiver 104 is an amplifier having an in-phase input, and
And 107 appear in the output, so that the anti-phase component does not appear in the output of the receiver amplifier 1041. That is, since the data component of the image signal channel V1 is driven in the opposite phase, it does not appear in the output of the receiver amplifier 1041.

FIG. 2 is a signal waveform diagram for explaining the operation of the high-speed digital interface device according to the first embodiment. In FIG. 2, data R1 is digital data supplied to the video signal channel V0. The signals R1 and / R1 are signals modulated by the switch means 1011 and 1012. Data R as shown
, And are modulated in mutually opposite phases. Data A0
Is digital data supplied to the audio signal channel A0. The signal A0 is indicated as an increase or decrease in the current value based on the data A0. Since the data R1 and the data A0 are in an asynchronous relationship with each other, the positions of the edges are not particularly aligned.

A signal in which the above two data are superimposed is shown as a waveform diagram of signals 106 and 107. The current is combined as an increase or decrease according to “0” or “1” of each data. Since the values of the current sources 1033 and 1011 can be set to arbitrary values, the voltage values generated in the signals 106 and 107 are not equal in width. The values of the current sources 1033 and 1011 are set to arbitrary values in order to adjust the width of the voltage value so as to have a required amplitude according to the signal band of each of the video signal and the audio signal. The signal 106 is the sum of the signal R1 and the signal A0, and the signal 107 is the sum of the signal / R1 and the signal A0. The channel V0 on the receiver side is a differential amplifier 10
23, among the signal components of the signals 106 and 107,
Since only the differential component is extracted, the signal 106
And the signal A0 added to the signals 107 and 107 does not appear. On the other hand, channel A0 on the receiver side,
A component based on the signals R1 and / R1, which are opposite-phase components, does not appear in the output amplified by the in-phase amplifier 1041. Only an in-phase component, that is, a component of the signal A0, appears as an output of the in-phase amplifier 1041.

As described above, in the first embodiment, the transmitting side adds the audio signal to the image signal as an in-phase signal,
On the receiving side, the audio signal added as an in-phase signal is extracted from the composite signal, so that cables and connectors having the same shape and physical structure information as existing equipment are used, that is, compatibility is maintained. In addition, the transmission of the audio channel can be added. In addition, since an independent channel which can omit the adjustment of the period relation can be used as the more channel, any asynchronous data can be transmitted without any restrictions and without affecting the transmission of the original signal. Further, since the video signal and the added audio signal are separated in an in-phase and out-of-phase relationship, the video signal and the added audio signal may be asynchronous. For example, the video signal may have a vertical frequency of 60H.
Even if it changes from z to 85 Hz according to the form and characteristics of the screen, it is not necessary to change the audio signal at all, and the video signal can be arbitrarily switched independently of the audio signal. Similarly, the sampling frequency of the audio signal is 32 kHz and 44.1 kHz.
Even when the frequency is changed to z, 48 kHz, the audio signal is independent and asynchronous with the video signal, so that the audio signal can be arbitrarily switched regardless of the video signal.

Embodiment 2 FIG. 3 is a diagram showing a configuration of a high-speed digital interface device according to a second embodiment of the present invention. In FIG.
308 is a transmitter for channel V1. 3011, 3012, 3081, 3
A switching unit 082 modulates input image data. 3013 denotes switching means 3011 and 3
Reference numeral 3083 denotes a current source connected to 012, and reference numeral 3083 denotes a current source connected to switching means 3081 and 3082. 302 is a receiver for channel V0, 3
09 is a receiver for channel V1. 3021
3022, 3091 and 3092 are transmission lines Z0 of a twisted pair.
Is a resistor connected as a load to the 3023,30
93 is a differential amplifier for differentially amplifying the signal appearing on the twisted pair. Reference numerals 3024 and 3025 denote resistors for extracting an in-phase component from the twisted pair for channel V0 transmission.
Reference numeral 4,3095 denotes a resistor for extracting an in-phase component from the twisted pair for channel V1 transmission. Reference numeral 303 denotes an audio data transmitter. 3031, 3032
Is switching means for modulating input audio data (channel A0). 3033 is a current source connected to the switching means 3031 and 3032. 304 is an audio data receiver,
Reference numeral 3041 denotes a differential amplifier that differentially amplifies the signal extracted by the resistors 3024 and 3025 and the signal extracted by the resistors 3094 and 3095.

Next, the operation will be described. The high-speed digital interface device according to the second embodiment differs from the high-speed digital interface device according to the first embodiment in that an inverted-phase signal of the channel A0, which is a more channel, is supplied to the transmitter 308 and the receiver 309. . That is, the high-speed digital interface device according to the second embodiment is configured to transmit or receive a differential signal of an audio signal in the opposite phase.

FIG. 4 is a signal waveform diagram for explaining the operation of the high-speed digital interface device according to the second embodiment. In FIG. 4, data R1 is digital data, data R supplied to video signal channel V0.
Reference numeral 2 denotes digital data supplied to the video signal channel V1. The signals R1 and / R1 are output from the switch 30.
Signals modulated by 11 and 3012, signals R2 and / R2 are signals modulated by switch means 3081 and 3082. As shown in FIG.
2 are modulated in mutually opposite phases.
Data A0 is digital data supplied to audio signal channel A0. Signals A0 and / A0 are signals modulated by switch means 3031 and 3032. As shown in the figure, modulation is performed in mutually opposite phases based on the data A0.

The signal A0 is superimposed on the signals R1 and / R1 to become composite signals 306 and 307. The signal / A0 is superimposed on the signals R2 and / R2, and the composite signals 310 and 31.
It becomes 1. Signal 306 is a signal of the sum of signal R1 and signal A0, signal 307 is a signal of the sum of signal / R1 and signal A0, signal 310 is a signal of the sum of signal R2 and signal / A0, and signal 31
1 is a signal of the sum of the signal / R2 and the signal / A0. Since only the differential component of the signal components of the signals 306 and 307 is extracted by the differential amplifier 3023 from the channel V0 on the receiver side, the signal A0 added to both the signals 306 and 307 does not appear. Further, since only the differential component of the signal components of the signals 310 and 311 is extracted by the differential amplifier 3093 from the channel V1 on the receiver side, the signals 310 and 311
Does not appear. On the other hand, the channel A0 on the receiver side, that is, the resistor 30
No components based on the signals R1 and / R1 which are the opposite-phase components appear in the outputs extracted by the outputs 24 and 3025. The signal 312, which appears as an output taken by the resistors 3024, 3025, is an in-phase component, ie,
Only the component of the signal A0 becomes. Similarly, components based on the signals R2 and / R2, which are opposite-phase components, do not appear in the channel / A0 on the receiver side, that is, the output extracted by the resistors 3094 and 3095. Resistance 309
The signal 313 appearing as an output extracted by 4,3095 is an in-phase component, that is, only a component of the signal / A0. Then, the signal 312 and the signal 313 are differentially amplified by the differential amplifier 3041, and the data of the channel A0 is output.

In the high-speed digital interface device according to the second embodiment, the audio signal component of the more channel is modulated and differentially communicated and demodulated based on the signal.
It is possible to reduce the voltage amplitude at 310 and 311. Therefore, it is possible to reduce the influence of unnecessary radiation and the like based on the rising edge and the falling edge of the amplitude.

In the high-speed digital interface device according to the first embodiment, the current drawn to the ground changes at a high speed when the switching means 1031 is turned on and off. This current flows through the ground line of the transmission path Z0 and may be accompanied by unnecessary radiation noise. On the other hand, in the high-speed digital interface device according to the second embodiment, since switching means 3031 and switching means 3032 perform complementary operations, one of them is always on, and a constant DC current is drawn to the ground. This DC current flows through the ground line of the transmission path Z0,
Since it is a direct current, no radiation noise occurs. Since the image signal is also differentially driven, similarly, only direct current flows through the ground line, and unnecessary radiation noise does not occur. Thus, the high-speed digital interface device according to the second embodiment can reduce the generation of radiation noise as compared with the high-speed digital interface device according to the first embodiment.

Embodiment 3 FIG. Next, a third embodiment of the present invention will be described. In the third embodiment, the high-speed digital interface device according to the second embodiment is applied as a specific digital interface device between a transmitting device and a receiving device.

FIG. 5 is a diagram showing a configuration of a transmitting apparatus and a receiving apparatus according to the third embodiment. In FIG. 5, 50
1 is a transmitting device, and 502 is a receiving device. 5011 is an encoder / serializer for the video signal R1, 5011 is an encoder / serializer for the video signal R2, 5013
Is an encoder / serializer for the video signal G1, 501
4 is an encoder / serializer for the video signal G2, 50
15 is an encoder / serializer for the video signal B1, 5
016 is an encoder / serializer for the video signal B2. Reference numerals 5017, 5018, and 5019 denote an audio baseband signal every two channels according to IEC95.
An IEC958 transmitter that converts the data into an 8 format and outputs it. IEC958 transmitter 5071
Converts the front L and front R of the baseband signal into the IEC958 format and outputs the IEC958 format.
The 58 transmitter 5018 converts the rear L and rear R of the baseband signal into the IEC958 format and outputs the same, and the IEC958 transmitter 5019 converts the center channel C and the regular channel AFE of the baseband signal into the IEC958 format and outputs the same. I do. In the receiving apparatus 502, 5021 is a recovery / decoder of the video signal R1, 5022 is a recovery / decoder of the video signal R2, and 5023 is a video signal G.
1, a recovery / decoder 5024 is a video signal G2
, 5025 is a recovery / decoder for the video signal B1, and 5026 is a recovery / decoder for the video signal B2. 5027, 5028, 50
An IEC958 receiver 29 receives and decodes an audio baseband signal. 5030 is IEC95
A digital-to-analog converter (D / A) converter for converting the audio baseband signal decoded by the 8-receiver 5027 into digital-to-analog signals and outputting front L and front R analog audio signals. D / A converter for outputting analog audio signals of rear L and rear R, 5032 is IEC9
58 is a D / A converter that converts the audio baseband signal decoded by the receiver 5029 from digital to analog and outputs analog audio signals of the center channel C and the regular channel AFE.

Next, the operation will be described. In the third embodiment, a total of six channels of front L, front R, rear L, rear R, center channel C, and regular channel AFE are transmitted as audio baseband signals. The baseband signal is once bundled every two channels, converted into the format of IC958, and superimposed on the video data. More specifically, in the third embodiment, a signal obtained by converting the two channels of the front L and R into IC958 format is superimposed on the video data R1 and R2, and the two channels of the rear L and R are collected by the IC958.
The format-converted signal is converted to video data G1 and G2.
To the center channel and the AFE channel.
The signals obtained by converting the channels in the IC 958 format are superimposed on the video data B1 and B2. As a result, 5.1 channel audio data can be transmitted together with the video data. The operation of superimposing the audio data on the video data on the transmission side and the operation of separating the audio data superimposed on the video data on the reception side are the same as the operations in the high-speed digital interface device according to the second embodiment, and thus are described in detail. Description is omitted.

According to such a configuration according to the third embodiment, there is no need to use time division multiplexing involving signal burst transmission, so that continuous transmission is possible for audio signal transmission. There is no need to worry about occurrence of clock jitter, the PLL on the receiving side can be simplified, and high performance can be realized.

In the third embodiment, an example is described in which the high-speed digital interface device according to the second embodiment is applied to superimpose one audio signal of IC958 format conversion on two-channel video data. By applying the high-speed digital interface device according to the first embodiment, one audio signal converted into IC958 format may be superimposed on one of the two channels of video data.

Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the high-speed digital interface device according to the second embodiment is applied as a specific digital interface device between a transmitting device and a receiving device.

FIG. 6 is a diagram showing a configuration of a transmitting apparatus and a receiving apparatus according to the fourth embodiment. In FIG.
Is a transmitting device, and 602 is a receiving device. Reference numeral 6011 denotes an encoder / serializer for the video signal R1, and reference numeral 6012 denotes an encoder / serializer for the video signal R2. 60
Reference numerals 13, 6014, and 6015 denote IEC958 transmitters that convert an audio baseband signal into an IEC958 format for every two channels and output the converted signal. The IEC958 transmitter 6013 converts the front L and front R of the baseband signal to IEC95
8 format and outputs the IEC958 transmitter 6014.
Convert rear R to IEC958 format and output,
The IEC958 transmitter 6015 has a center channel C and a regular channel AF of the baseband signal.
E is converted to IEC958 format and output. 6
016 is an IEC958 transmitter 6013, 601
This is a multiplexer for performing time division multiplexing of the outputs of the 4,6015 and outputting the same. In the receiving apparatus 602, reference numeral 6021 denotes a recovery / decoder for the video signal R1, and reference numeral 6022 denotes a recovery / decoder for the video signal R2. Reference numeral 6023 denotes a demultiplexer that separates time-division multiplexed audio data. Reference numerals 6024, 6025, and 6026 denote IEC958 receivers that decode the audio baseband signals separated by the demultiplexer 6023.
Reference numeral 6027 denotes a D / A converter which converts an audio baseband signal decoded by the IEC958 receiver 6024 from digital to analog to output front L and front R analog audio signals, and 6028 denotes an IEC95
8 receiver 6025 converts the audio baseband signal to digital-to-analog conversion to rear L, rear R
A D / A converter 6029 for outputting an analog audio signal of the same type. A digital / analog converter 6029 converts the audio baseband signal decoded by the IEC958 receiver 6026 into a center channel C and a regular channel AF.
This is a D / A converter that outputs an analog audio signal of E.

Next, the operation will be described. In the fourth embodiment, a total of six channels of front L, front R, rear L, rear R, center channel C, and regular channel AFE are transmitted as audio baseband signals. The baseband signal is once bundled every two channels, converted into the format of the IC958, further time-division multiplexed, and superimposed on the video data. Transmission device 6
At 01, the video signals R1, R2 are transmitted by encoder / serializers 6011 and 6012. On the other hand, the audio signal is transmitted to the IEC958 transmitter 6
013, 6014, and 6015, the data is converted into the format of the IC 958 in such a manner as to be grouped for every two channels. These six-channel signals are combined by the multiplexer 6016 and superimposed on the video signals R1 and R2 as one time-division multiplexed signal. The audio 6-channel signal is time-division multiplexed, but each data signal has R1 as an in-phase component.
And R2, and R1 and R2 are modulated so that they have an antiphase relationship.

In the fourth embodiment, six channels of the audio signal are multiplexed. However, since the data rate of the audio signal is lower than that of the video signal, even if the six channels are multiplexed, the audio signal is equal to or higher than the video signal. There is no particular problem because of the following.

According to the fourth embodiment, the portion to be superimposed on the video signal can be reduced to one system.
As compared with the third embodiment, the hardware configuration can be simplified, the cost can be reduced, and the transmission resources can be used effectively.

In the fourth embodiment, one high-speed digital interface device according to the second embodiment is applied, IC958 format conversion is performed, and one time-division multiplexed audio signal is superimposed on two-channel video data. However, by applying the high-speed digital interface device according to the first embodiment, I
One audio signal that has been converted to the C958 format and time-division multiplexed is converted into one of two channels of video data.
You may make it superimpose on a channel.

[0037]

As described above, according to the present invention (claim 1), there is provided a high-speed digital interface device for transmitting an image signal and an audio signal between a transmitting side and a receiving side, wherein Composite signal output means for outputting a composite signal obtained by adding a voice signal to a signal as an in-phase signal;
On the receiving side, a signal extracting means for extracting an audio signal added as an in-phase signal from the composite signal is provided, so that cables and connectors having the same shape and physical structure information as existing equipment are used. In other words, it is possible to add the transmission of the audio channel while maintaining the compatibility, and to use the independent channel as the more channel, which can omit the adjustment of the periodic relation, so that any asynchronous data is not limited. Further, there is an effect that a high-speed digital interface device capable of transmitting without affecting transmission of the original signal can be realized.

According to the present invention (claim 2), there is provided a signal transmitting apparatus for transmitting an image signal and an audio signal,
Because it was configured to include a composite signal output unit that outputs a composite signal obtained by adding an audio signal to an image signal as an in-phase signal,
There is an effect that an audio channel can be transmitted to a receiving device using a cable and a connector having the same shape and physical structure information as a device that transmits only an image signal.

According to the present invention (claim 3), there is provided a signal receiving apparatus for receiving an image signal and an audio signal,
A signal extracting means for receiving a synthesized signal obtained by adding an audio signal to the image signal as an in-phase signal and extracting an audio signal added as an in-phase signal from the synthesized signal; There is an effect that an audio signal added as an in-phase signal can be extracted from a combined signal transmitted from a transmission device including a combined signal output unit that outputs a combined signal obtained by adding signals as an in-phase signal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a high-speed digital interface device according to a first embodiment of the present invention.

FIG. 2 is a waveform chart for explaining the operation of the high-speed digital interface device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a high-speed digital interface device according to a second embodiment of the present invention.

FIG. 4 is a waveform chart for explaining the operation of the high-speed digital interface device according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a transmitting device and a receiving device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a transmitting device and a receiving device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a conventional high-speed digital interface device.

[Explanation of symbols]

101 Transmitter 1011, 1012 Switching means 1013 Current source 102 Receiver 1021, 1022 Resistance 1023 Differential amplifier 103 Transmitter 1031 Switching means 1033 Current source 104 Receiver 1041 Receiver amplifier 301, 308 Transmitter 3011, 3012, 3081, 3082 Switching means 3013, 3083 Current Source 302, 309 Receiver 3021, 3022, 3091, 3092 Resistance 3023, 3093 Differential amplifier 3024, 3025, 3094, 3095 Resistance 303 Transmitter 3031, 3032 Switching means 3033 Current source 304 Receiver 3041 Differential amplifier 501 Transmitter 502 Receiver 5011 , 501 , 5013,5014,5015,
5016 encoder / serializer 5017, 5018, 5019 IEC958 transmitter 5021, 5022, 5023, 5024, 5025
5026 recovery / decoder 5027, 5028, 5029 IEC958 receiver 5030, 5031, 5032 D / A converter 601 transmitter 602 receiver 6011, 6012 encoder / serializer 6013, 6014, 6015 IEC958 transmitter 6016 multiplexer 6021, 6022 recovery / decoder 6023 demultiplexer 6024, 6025, 6026 IEC958 receiver 6027, 6028, 6029 D / A converter

Claims (4)

[Claims] 1. A high-speed digital interface device for transmitting an image signal and an audio signal between a transmission side and a reception side, wherein the transmission side outputs a composite signal obtained by adding an audio signal to an image signal as an in-phase signal. A high-speed digital interface device comprising: synthesized signal output means; and signal extraction means on a receiving side for extracting a voice signal added as an in-phase signal from the synthesized signal. 2. A signal transmitting apparatus for transmitting an image signal and an audio signal, comprising: a composite signal output means for outputting a composite signal obtained by adding an audio signal to the image signal as an in-phase signal. Transmission device. 3. A signal receiving apparatus for receiving an image signal and an audio signal, comprising: receiving a synthesized signal obtained by adding an audio signal to an image signal as an in-phase signal; A signal receiving device comprising: signal extracting means for extracting a signal. 4. The high-speed digital interface device according to claim 1, wherein the synthesized signal output means for outputting a synthesized signal obtained by adding an audio signal to the image signal as an in-phase signal, comprises: outputting an amplitude of the image signal and an amplitude of the audio signal. A high-speed digital interface device characterized by being different from each other.