Mountain Avenue, Murray Hill, NJ 07974, USA. In the final sentence in the penultimate paragraph of. Section 1, 'channel vocoder' should read 'channel and LPC.
Similarly, the variance of the acquisition time is obtained
and hence (41)
J
'oo
t2p(t) dt
0
+ £ 3(n = Tf [1/3 + 2PM/PD
+ 2P2M/P2D-]
(40)
Erratum EPHRAIM, Y., and MALAH, D.: 'Combined enhancement and adaptive transform coding of noisy speech', IEE Proc. F, Commun., Radar & Signal Process., 1986, 133, (1), pp. 81-86 In the footnote on p. 81, it should be noted that Yariv Ephraim is now with AT & T Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974, USA In the final sentence in the penultimate paragraph of Section 1, 'channel vocoder' should read 'channel and LPC vocoders' In eqn. 11, the second square-root sign in the final line should be extended to apply to both the fractions before the exponential term In eqn. 13, the ' > ' symbol in the left-hand expression should be ' = ', and the symbol ykG should be yk In the paragraph following eqn. 13 and again in the paragraph following Fig. 2, the reference to [11] should be to eqn. 11 rather than to Reference 11 In Fig. 2, the term 'SNR (vk — 1)' in the horizontal axis should be 'SNR (yk - 1)' The 'hat' which occurs above X in the numerator of the first right-hand term in eqn. 16 (and again in Fig. 3b) should be above the centre of the modulus term; and there should be a closing parenthesis after a in the second term In the second line after eqn. 17, there should be a 'hat' above yfc, „ In the first line of Section 4, in the 13th line of the righthand column on p. 84, and again in the first and last lines in the Appendix, the reference to [11] should be to eqn. 11 rather than to Reference 11 In eqn. 18, the modulus term on the left-hand side should have a 'hat' above it The square-root signs in the denominators of eqns. 19, 20 and 21 should be extended to apply to the whole denominator in each case; and the square-root sign in eqn. 22 applies to both fractions before the exponential terms The final 'cos' term in eqn. 22 should read /v.
Fig. 4
Y.\
x cosh Fig. 4 should be as shown here:
a b c d e
Waveform plots for 16 kbit/s encoding rate and 5 (IB input SNR
Original speech (64 ms) Encoded original speech Noisy speech Directly encoded noisy speech Enhanced-encoded noisy speech
4473F
IEE PROCEEDINGS,
Vol. 133, Pt. F, No. 2, APRIL 1986
137
