Iec 61606-2-2009.Pdf

IEC 61606 2 Edition 2 0 2009 07 INTERNATIONAL STANDARD Audio and audiovisual equipment – Digital audio parts – Basic measurement methods of audio characteristics – Part 2 Consumer use IE C 6 16 06 2 2[.]

Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61606-1 as well as the following apply

3.1.1 analogue full-scale amplitude nominal signal level of an EUT corresponding to the digital full-scale level

To ensure compatibility with the EUT in audio systems, it is advisable to set the analogue full scale amplitude to the value specified in IEC 61938, which is 2 V r.m.s for general purpose audio in consumer equipment.

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

3.1.2 normal load impedance value defined in IEC 61938, or in the case of general purpose audio for consumer equipment,

3.1.3 normal measuring level analogue signal level equal to –20 dB of analogue full-scale amplitude

3.1.4 normal source impedance value defined in IEC 61938, or in the case of general purpose audio for consumer equipment,

Explanation of terms “jitter”

Digital interface for measurement

This standard can be applied to IEC 60958 or IEC 61883-6

Other interfaces having the same specification as in 3.1 of IEC 61606-1 may also be used.

Rated values

For a full explanation of these terms, see IEC 60268-2 The following are rated conditions for digital audio equipment which should be specified by the manufacturer:

• rated pre-emphasis and de-emphasis characteristics;

• rated digital input word length;

General

The measuring conditions applied in this part are the same as those given in IEC 61606-1, together with those given below.

Environmental conditions

As specified in 4.1 of IEC 61606-1.

Power supply

Test signal frequencies

Standard setting

As specified in 4.4 of IEC 61606-1

Preconditioning

Measuring instruments

General

All specifications given in IEC 61606-1 are applicable, together with those given below.

Digital level meter

The r.m.s signal level, V total is calculated from the digital data within the in-band frequency range

One method of calculation is as follows:

The signal level is determined by calculating the frequency components using the FFT method This involves evaluating all frequency components that fall within the in-band frequency range, as described by the relevant equation.

The signal level S in dB FS is calculated from the following equation:

S dB FS = 20 log 10 (V total /V full ) where V full is the r.m.s value of the full-scale amplitude of a 1 kHz signal

For FFT calculations, the number of data points must exceed the sampling frequency (\$f_s\$) The measurement will utilize the smallest window that meets the specified parameters.

L is the number of data points, a 0 = 0,363 491 2, a 1 = 0,489 268 2, a 2 = 0,136 508 8, a 3 = 0,010 731 8, and t ≤ L/2

NOTE If the signal level is calculated directly using digital data, it should be filtered to the in-band frequency range before the calculation.

Distortion meter

Calculate the ratio of the total signal output to the noise and distortion component

NOTE One measurement method is as follows

The r.m.s signal level, V total is calculated from the resultant in-band frequency components of the fast Fourier Transformation (FFT) of the processed input signal:

The variable $ V_N $ is calculated using the Fast Fourier Transform (FFT) for frequency ranges between 4 Hz and $ f_L $, where $ f_L $ is 1.5 times the measuring frequency Additionally, $ f_H $ is defined as 1.5 times the measuring frequency, extending to the upper limit frequency $ f_{MAX} $ The derivation of $ V_N $ is based on a specific equation.

V N = ((V f12 + V f22 + V f32 + … V fL2 ) + ( V fH 2 + V fH+12 + V f MAX2 )) 1/2 The total distortion D is obtained from the equation:

D = V N / V total × 100 % The conditions for the measurement are the same as those for the digital level meter.

Analogue weighting filter

The weighing filter used shall have A-weighing characteristics with tolerances ±1 dB as specified for sound level measurements in IEC 61672-1.

Digital weighting filter

The characteristics of weighing filter shall comply with A-weighing characteristics with tolerances ±1 dB as specified for sound level measurements in IEC 61672-1.

Digital spectrum analyzer

A digital spectrum analyzer computes the Fast Fourier transform (FFT) of the input digital signal

5 Methods of measurement (digital-in/analogue-out)

General

The measurement methods outlined in the subsequent sub-clauses pertain to equipment that receives a digital audio signal as input and produces an analogue signal as output All specifications detailed in IEC 61606-1 relevant to this standard are applicable to these sub-clauses.

These subclauses specify the details of measurement methods for consumer use equipment

If the EUT provides two or more channels, all channels should be measured in the same way

The word length and sampling frequency shall be stated in the expression of the results of the measurement.

Input/output characteristics

Maximum output amplitude

Signal level: full-scale level

Set the EUT to the standard setting specified in 4.5

Apply the input signal to the EUT

Adjust the level control and measure the maximum output voltage which does not show clipping and has total distortion of less than 1 %.

Gain difference between channels

5.2.2.1 Block diagram of measuring devices

Connect the EUT and measuring instrument as in Figure 1

Figure 1 – Connection diagram of equipment

Signal level: normal measuring level (–20 dB FS )

To measure the gain difference between channels, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, adjust the gain control to its maximum position and apply the same input signal to all channels, either simultaneously or sequentially Finally, measure the output level of each channel, with the gain difference expressed in decibels (dB).

Frequency characteristics

Frequency response

Connect the EUT and measuring instruments as shown in Figure 2

Digital signal generator EUT Narrow band-pass filter In-band level meter

Digital signal generator EUT In-band level meter

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. a) Reference signal

Signal level: normal measuring level (–20 dB FS ) b) Test signal

The discrete frequency method is detailed in IEC 61606-1, Table 1, while the sweep frequency method covers a frequency range from 16 Hz to 1/2 × f s, consistent with the notes provided under Table 1 of IEC 61606-1.

Signal level: normal measuring level (–20 dBFS)

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply a reference signal to the EUT and measure the output signal using an analogue in-band level meter Repeat this measurement for the test signals and calculate the voltage ratio between the two measurements in decibels (dB) Finally, present the results in a table or graphical format.

Group delay (phase linearity)

Connect the EUT and measuring instruments as in Figure 3

The signal generator for group delay measurement (described in IEC 61606-1, 4.6.2.3.2) shall be used

To analyze the output waveform from the Equipment Under Test (EUT), first set the EUT to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT, and then utilize FFT equipment to obtain the phase measurement, denoted as ΦR.

To analyze the 1 kHz signal, calculate the group delay \$\tau_R\$ using the formula: \$\tau_R = \left(-\frac{\Phi_R}{360}\right) \times \left(\frac{1}{997}\right)\$ Additionally, repeat the analysis for the testing frequency to determine the phase \$\Phi_C\$ and the delay time \$\tau_C\$ using the appropriate equation.

Digital signal generator EUT Analogue group delay meter

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. τC = (–ΦC/360) × (1/f)

When the phase exceeds 360°, adjustments must be made to the reading prior to calculating the equation The group delay difference (\$τ_{RC}\$) and phase linearity (\$Φ_{RC}\$) at the specified frequency can be determined using the equations: \$τ_{RC} = τ_C - τ_R\$ and \$Φ_{RC} = τ_{RC} \times 360 \times f\$.

Noise characteristics

Signal-to-noise ratio

Signal (A): Signal level = Full-scale level

To measure the signal-to-noise ratio (SNR) of the equipment under test (EUT), first set the EUT to the standard settings specified in section 4.5 Next, apply signal (A) to the EUT and record the meter reading as A dB FS Then, apply signal (B) and note the meter reading as B dB FS Finally, calculate the signal-to-noise ratio (SN) in dB using the formula: SN = (A – B).

Dynamic range

Digital signal generator EUT Low-pass filter

NOTE If the analogue distortion meter has sufficient amplification for the measurement, the voltage amplifier may not be needed

To evaluate the Equipment Under Test (EUT), first set it to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT and measure the noise and distortion percentage (N) using an analogue distortion meter If necessary, repeat this process for each sampling frequency Finally, calculate the dynamic range (D) in decibels (dB) using the specified equation.

Out-of-band noise ratio

Out-of band band pass filter Out-of band level meter

Frequency: 997 Hz, 10 007 Hz, 14 501 Hz, 19 997 Hz and the upper band-edge frequency

Signal level: full-scale level (0 dB FS )

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT and record the in-band level meter reading as A dB FS Then, note the out-of-band level meter reading as B dB FS Finally, calculate the out-of-band noise ratio using the appropriate equation.

Out-of-band noise ratio = (B – A) dB.

Channel separation

Frequency: 997 Hz and other frequencies in IEC 61606-1, Table 1, if necessary

Signal level: full-scale level

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply a 997 Hz input signal to all channels connected to a single stereo source Adjust the EUT's balance control to achieve equal output levels; if this is not possible, correct the measured values based on the level difference Measure the output signal level in A dBFS Finally, apply a digital zero to the input terminal of the selected channel while applying the same signal to the other channels.

Digital signal generator EUT Narrow-band band-pass filter

To measure the output signal level of the selected channel affected by leakage from unwanted channels, record the value as B dB If necessary, repeat this measurement for additional frequencies Channel separation can be calculated using the formula: channel separation = (A – B) dB Finally, change the selected channel and repeat the measurement process.

Distortion characteristics

Level non-linearity

Signal level: given in Table 1

NOTE For 16 bit systems, use the signal level from the Table 1 that are less than 100 dB FS

When a 20 bit system is measured, –80 dBFS or –90 dBFS may be used instead of –82 dBFS or –89 dB FS respectively

When a 24 bit system is measured, –80 dB FS and –90 dB FS and –110 dB FS may be used instead of –82 dB FS or –89 dB FS or –113 dB FS respectively

The following procedure applies a) Set the EUT to the standard settings specified in 4.5

Digital signal generator EUT Narrow-band band-pass filter

For internal use at the Ranchi/Bangalore location, licensed to MECON Limited and supplied by Book Supply Bureau, it is essential to set the level controller to its highest position if the rated output signal level cannot be achieved Next, apply the input signal to the Equipment Under Test (EUT) and observe the in-band level meter's indication This measurement should be repeated for various signal levels within the specified range The linearity is determined by calculating the difference between the theoretical output level and the actual measured value.

Distortion and noise

Frequency: 997 Hz or as given in IEC 61606-1, Table 1, if needed

Signal level: full-scale level (0 dB FS )

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply an input signal at a frequency of 997 Hz to the EUT and record the reading from the analogue distortion meter Finally, repeat this measurement process for additional input frequencies.

Intermodulation

The signal specified in IEC 61606-1, 4.6.2.2 shall be used

Digital signal generator EUT Low-pass filter Analogue distortion meter

Digital signal generator for inter-modulation EUT Low-pass filter Inter-modulation distortion meter

To measure intermodulation distortion, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT, and then use an intermodulation distortion meter to measure the output signal's distortion.

6 Methods of measurement (analogue-in/digital-out)

General

The measurement methods outlined in the following sections pertain to equipment that converts analogue input signals into digital audio output signals All specifications detailed in IEC 61606-1 are relevant to this standard and are elaborated upon below These sections provide specific measurement methods intended for consumer use equipment.

There are two types of Equipment Under Test (EUT): those with digital output terminals and those without The EUTs lacking digital output terminals are usually recording devices, including DAT, CD-R, and similar equipment.

Input/output characteristics

Analogue to digital level calibration

6.2.1.1.1 EUT with digital output terminals

6.2.1.1.2 EUT without digital output terminals

Analogue signal generator EUT Digital level meter

Signal level: normal measuring level (0,2 V r.m.s.)

6.2.1.3.1 Equipment with digital output terminals

To conduct the procedure, first, adjust the controls of the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT, ensuring that the normal measuring level of -20 dBFS is achieved by varying the input signal around 0.2 V r.m.s Then, read the indication from the in-band level meter, denoted as A V r.m.s Finally, calculate the analogue full-scale level by multiplying A V r.m.s by ten.

6.2.1.3.2 Equipment without digital output terminals

The following procedure applies a) Set the EUT to the standard settings specified in 4.5 b) Apply the input signal with levels of –6 dB to +6 dB from the normal measuring level in

To measure the signal level, adjust in 1 dB steps and record the output on a recording medium Next, reproduce the recorded signal with a standard player and monitor the output level using a digital level meter Finally, estimate the analogue input signal level, A V r.m.s., that corresponds to 1/10 of the full-scale output level, where (10 × A V r.m.s.) represents the analogue full-scale level.

Maximum allowable input amplitude

Signal level: from 0 V r.m.s to in excess of the analogue full-scale level

6.2.2.3.1 Equipment with digital output terminals

The following procedure applies a) Set the EUT to the standard settings specified in 4.5 b) Apply the input signal and increase the signal amplitude gradually from 0 V r.m.s

To ensure optimal performance, adjust the digital output terminal level to maintain it at the normal measuring level of –0 dB FS Additionally, measure the input signal amplitude at which a further increase leads to 1% distortion in the output signal For equipment under test (EUT) lacking a level control, assess the input signal level that produces a 1% distorted output signal.

Analogue signal generator EUT Digital distortion meter

To evaluate the performance of the Equipment Under Test (EUT), follow these steps: First, configure the EUT to the standard settings outlined in section 4.5 Next, for EUTs equipped with an input signal level indicator, determine the maximum non-clipping input signal level for the A/D converter Then, apply the input signal to the EUT and record the output signal on a recording medium, covering an input level range from –10 dB to +6 dB above the estimated non-clipping level in 1 dB increments After recording, measure the distortion of the output signal using a playback device If the distortion exceeds 1%, note the distortion meter reading as a percentage and the input level as A dB Additionally, measure the distortion at an input signal level of (A − 1) dB, recording this as b % Finally, calculate the level L dB that results in 1% distortion for the EUT using the appropriate equation.

L dB = {A – (a – 1)/(a – b)} dB h) In case both a and b exceed 1 %, or are less than 1 % , adjust the input signal level to the

EUT so that an input signal is available where a exceeds 1 % and b is less than 1 %.

Gain difference between channel and tracking error

To evaluate the performance of the Equipment Under Test (EUT), follow these steps: First, configure the EUT to the standard settings outlined in section 4.5 Next, adjust the level controller to its maximum gain position and apply the input signal to each channel Measure the output levels across all channels and calculate the gain differences, identifying the maximum gain difference from the highest gain channel Subsequently, reduce the level controller's position and measure the output signal levels for each channel again Calculate the gain differences for each level controller position Finally, determine the tracking error as the largest gain difference observed when the level controller is adjusted within a specified attenuation range.

0 dB to –60 dB h) For EUT without a level control the gain difference is the level difference between channels at the largest gain

To evaluate the performance of the Equipment Under Test (EUT), follow these steps: First, configure the EUT to the standard settings outlined in section 4.5 Next, adjust the level controller to its maximum gain position Then, apply the input signal to each channel of the EUT and record the output signals across a specified attenuation range, from 0 dB to -60 dB After recording, measure the output signal levels for each channel using a standard player Subsequently, calculate the level difference for each signal The maximum level difference obtained will represent the tracking error, while the level difference at 0 dB attenuation indicates the gain difference.

This document is licensed to MECON Limited for internal use in Ranchi and Bangalore, as supplied by the Book Supply Bureau In systems without level control, the gain difference corresponds to the level difference between channels at the maximum gain.

Frequency characteristics

Frequency response

Frequency: a) spot frequencies: see IEC 61606-1, Table 1 b) sweep frequency: the frequency range is from 16 Hz to 1/2 x f s which is the same as the comment under the Table 1 of IEC 61606-1

The following prodecure applies a) Set the EUT to the standard settings specified in 4.5 b) Apply the 997 Hz sine signal at the normal measuring level to the EUT

To assess the output signal of the Equipment Under Test (EUT), utilize a digital level meter if a digital output terminal is available If not, record the output signal onto a medium and measure it using a standard digital player Apply various spot frequencies at the same signal level to the EUT and measure the output signal levels accordingly Calculate the differences between the output at 997 Hz and other frequencies, presenting the results in a table or graphical format Additionally, frequency response can be evaluated using a sweep signal generator.

Group delay

The input signal described in IEC 61606-1, 4.6.2.3.1 shall be used

Analogue signal generator EUT Digital group delay meter

To conduct the measurement, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT and measure the delay time \$\tau_R\$ of the 997 Hz component using a digital group delay meter Additionally, read the delay time \$\tau_C\$ at the measuring frequency \$f\$ Finally, calculate the group delay of the EUT at the measuring frequency \$f\$ using the formula: \$\tau = \tau_C - \tau_R\$.

To measure the group delay of the Equipment Under Test (EUT), first set it to the standard settings specified in section 4.5 Next, apply the input signal to the EUT and record the output onto a medium After that, reproduce the recorded signal and measure the delay time \$\tau_R\$ of the 997 Hz component using a digital group delay meter Additionally, determine the delay time \$\tau_C\$ of the measuring frequency \$f\$ on the same meter Finally, calculate the group delay of the EUT at the measuring frequency \$f\$ using the formula: \$\tau = \tau_C - \tau_R\$.

Noise characteristics

Signal-to-noise ratio (idle channel noise)

Analogue signal generator EUT Digital Digital level meter weighting filter

In-band level meter Digital monitor

6.4.1.2 Input signal a) Reference signal: frequency: 997 Hz signal level: analogue full-scale level b) Noise measuring condition: terminated the analogue input terminals with a normal source impedance

To conduct the procedure, first, configure the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply an input reference signal and measure the output level of the EUT in dB FS Finally, disconnect the analog input signal and adjust the input terminal to the specified input condition.

Measure the output signal level, B dB FS d) Calculate the signal-to-noise ratio from the following equation:

Signal-to-noise ratio = (A – B) dB

To evaluate the performance of the Equipment Under Test (EUT), follow these steps: First, configure the EUT to the standard settings outlined in section 4.5 Next, apply a reference signal to an input terminal and capture the output signal on a recording medium Afterward, use a standard medium player to replay the recorded signal and measure the output level, denoted as A dB FS Then, disconnect the analog input signal and adjust the input terminals to the specified condition, recording the output signal again Replay this second recording with the standard medium player and measure the output level, labeled as B dB FS Finally, compute the signal-to-noise ratio using the appropriate formula.

Signal-to-noise ratio = (A – B) dB

Analogue signal generator EUT Digital weighting filter

Dynamic range

6.4.2.1.1 EUT with digital output terminal

Signal level –60 dB from analogue full-scale level

To measure the dynamic range of the Equipment Under Test (EUT), first set it to the standard settings specified in section 4.5 Next, apply an input signal and adjust its level until the output signal reaches -60 dB FS Then, read the digital distortion meter's indication and convert this reading into dB, denoting it as A Finally, calculate the dynamic range D using the appropriate equation.

Analogue signal generator EUT Digital weighting filter

To evaluate the performance of the Equipment Under Test (EUT), first, set it to the standard settings outlined in section 4.5 Next, apply an analogue input signal and record the output signal onto a recording medium Afterward, replay the recorded medium and measure the distortion using a digital distortion meter Convert the distortion reading into decibels (dB) as A, and calculate the dynamic range (D) using the appropriate equation.

Folded noise

Interfering frequency: f 1 , f 2 , f 3 (refer to Table 2) f 1 = f s – upper band-edge frequency f 2 = f s – 10 kHz

In-band level meter Digital monitor

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. f 3 = f s – 1 kHz

Signal level: analogue full-scale level

Table 2 – Interfering frequency f s kHz f 1 kHz f 2 kHz f 3 kHz

To conduct the procedure, first, configure the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, input a 997 Hz analogue signal at full-scale level and measure the output level, denoted as A dB FS Then, introduce an interfering signal to the EUT's input terminal and record the output signal level, referred to as B dB FS, using a digital level meter Finally, calculate the folded noise level using the appropriate equation.

To evaluate the Equipment Under Test (EUT), follow these steps: First, configure the EUT to the standard settings outlined in section 4.5 Next, input a 997 Hz analogue signal at full-scale level and record it onto a medium Then, play back the recorded signal using a standard digital player and measure the maximum output level, denoted as A dB FS, with a digital level meter Afterward, introduce an interfering signal to the EUT's input terminal and record this signal onto a medium as well Reproduce this recorded signal using a standard player and measure the output signal level, labeled as B dB FS, with the digital level meter Finally, calculate the folded noise level using the appropriate equation.

Cross-talk

Frequency: given in IEC 61606-1, Table 1

Signal level: –3 dB from analogue full-scale level

To measure cross-talk attenuation, first set the Equipment Under Test (EUT) to the standard settings specified in section 4.5 Next, select the desired source group and apply the input signal to a chosen channel within that group Record the output level of this channel as A dBFS Ensure the input terminal of the selected channel is terminated with the normal source input impedance Then, apply the same input signal to the input terminals of the channels in the unwanted source group that are not selected Finally, measure the output signal level at the output terminal of the selected channel in the desired source group, recording this as B dBFS The cross-talk attenuation can be calculated using the formula: (A – B) dB.

Analogue signal generator EUT Narrow-band band-pass filter Digital level meter

Analogue signal generator EUT Standard digital player Narrow band band-pass filter Digital level meter

To measure cross-talk attenuation, follow these steps: First, configure the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, select the desired source group and apply the input signal to a chosen channel, recording it onto a medium Then, use a standard digital player to reproduce the recorded signal and measure the output level as A dBFS After terminating the input terminal of the selected channel with the normal source input impedance, apply the same input signal to the channels of the unwanted source group that were not selected, and record the output signal to a medium Reproduce this recorded signal and measure the output level at the selected channel's output terminal in the wanted source group, denoting it as B dBFS Finally, calculate the cross-talk attenuation using the formula: (A – B) dB.

Channel separation

Frequency: 997 Hz and other frequencies in IEC 61606-1, Table 1 if necessary

Signal level: –3 dB from the analogue full-scale level

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings specified in section 4.5 Next, apply a 997 Hz input signal to all channels linked to a single stereo source and adjust the balance control to achieve equal output levels; if adjustment is not possible, correct the measured values based on the level difference Measure the output signal level of the desired channel as A dB FS and terminate its input terminal with the rated source input impedance Then, apply the same input signal levels to other channels and measure the output level of the desired channel as B dB FS For multi-channel EUTs, change the input signal to another terminal and repeat the measurements If necessary, repeat the measurements for additional frequencies Channel separation can be calculated using the appropriate equation.

To conduct the procedure, first, set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply a 997 Hz input signal to all channels connected to a single stereo source and record the output signal onto a medium Then, reproduce the recorded signal with a standard digital player and measure the output signal levels of all channels in dB FS After that, terminate the input terminal of the selected channel with the rated source input impedance Finally, apply the same input signal levels to the remaining channels and record the output signal from the desired channel onto the medium.

Analogue signal generator EUT Standard digital player Narrow band band-pass filter

The recorded signal of the desired channel should be reproduced, and its output level measured in B dB FS For multi-channel equipment, switch to a different input terminal and repeat the measurement process Additionally, if required, conduct the same measurements for other frequencies Channel separation can be calculated using the appropriate equation.

Distortion characteristics

Level non-linearity

6.5.1.1.1 EUT with digital output terminal

Signal level: given in Table 1 for word lengths of 16, 20 and 24 bits

Analogue in-band level meter

Analogue signal generator EUT Standard digital player

Narrow band band-pass filter Digital level meter

Analogue in-band level meter

To conduct the procedure, first, configure the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, measure the output signal level for each input signal level listed in Table 1 Finally, document the deviation of the output levels for each input signal level in relation to the normal measuring level.

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, record the output signal for each input signal level specified in Table 1 After that, reproduce the recorded signal and measure the output signal level corresponding to each input signal level Finally, document the deviation of the output levels for each input signal level in relation to the normal measuring level.

Distortion and noise

Frequency: given in IEC 61606-1, Table 1

Signal level: analogue full-scale level

To conduct the procedure, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply an input signal to the EUT, with the option to adjust the signal level between +3 dB and -3 dB of the analogue full-scale level if deemed necessary by the testing personnel Finally, measure the output signal distortion using a digital distortion meter.

To evaluate the performance of the Equipment Under Test (EUT), first, configure it to the standard settings outlined in section 4.5 Next, input a signal into the EUT and capture this signal onto a recording medium Finally, play back the recorded signal using a standard digital player and measure the distortion with a digital distortion meter.

When multiple input signals are recorded, various values can be derived, and any of these values can serve as the distortion and noise associated with the relevant Equipment Under Test (EUT).

Intermodulation

Analogue signal generator EUT Inter modulation meter

The signal specified in IEC 61606-1, 4.6.2.3.1 shall be used

To measure intermodulation distortion, first configure the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT and utilize an intermodulation distortion meter to assess the output signal's distortion levels.

To measure intermodulation distortion, first set the Equipment Under Test (EUT) to the standard settings outlined in section 4.5 Next, apply the input signal to the EUT and capture the output signal on a recording medium Finally, reproduce the recorded signal and assess the intermodulation distortion of the output using an intermodulation distortion meter.

Analogue signal generator EUT Inter modulation meter

Tiêu đề	Basic measurement methods of audio characteristics – Part 2: Consumer use
Chuyên ngành	Electrical and Electronic Technologies
Thể loại	International Standard
Năm xuất bản	2009
Thành phố	Geneva

Định dạng
Số trang	40
Dung lượng	1,04 MB